Station Overview Station Location
Station Number CA-MA-8 Latitude 37.116
Station Name Chowchilla 0.3 E Longitude -120.252
County Madera Elevation (ft) 238



Month 30 Yr Avg by PRISM Total Prcp Sum Days Covered By All Observations Daily Prcp Sum Daily Observation Count Multiday Prcp Sum Days Covered by Multiday Observations Multiday Observation Count Days With Prcp Days With Trace Total Snowfall Days With Snowfall Days With Snow On Ground
Oct 19 0.74 0.00 31 0.00 31 0.00 0 0 0 0 0.0 0 0
Nov 19 1.32 0.45 30 0.45 30 0.00 0 0 4 0 0.0 0 0
Dec 19 2.00 3.71 31 3.71 31 0.00 0 0 14 0 0.0 0 0
Jan 20 2.50 0.92 31 0.92 31 0.00 0 0 4 1 0.0 0 0
Feb 20 2.26 0.01 29 0.01 29 0.00 0 0 1 0 0.0 0 0
March 20 2.15 2.14 31 2.14 31 0.00 0 0 11 2 0.0 0 0
April 20 1.01 1.41 30 1.41 30 0.00 0 0 7 1 0.0 0 0
May 20 0.47 0.54 31 0.54 31 0.00 0 0 2 1 0.0 0 0
June 20 0.12 0.00 30 0.00 30 0.00 0 0 0 0 0.0 0 0
July 20 0.01 0.00 31 0.00 31 0.00 0 0 0 0 0.0 0 0
Aug 20 0.02 0.00 31 0.00 31 0.00 0 0 0 2 0.0 0 0
Sept 20 0.17 0.00 30 0.00 30 0.00 0 0 0 0 0.0 0 0
Water Year Totals: 12.77" 9.18" 366 days 9.18" 366 0.00" 0 days 0 43 days 7 days 0.0" 0 days 0 days



Days in Water Year Cell Color Key
        Daily Observation with Prcp         Missing Day
        Multiday Observation         Daily/Multiday Observation Conflict

Day of Year Daily Prcp Multiday Prcp
10/1/2019 0.00
10/2/2019 0.00
10/3/2019 0.00
10/4/2019 0.00
10/5/2019 0.00
10/6/2019 0.00
10/7/2019 0.00
10/8/2019 0.00
10/9/2019 0.00
10/10/2019 0.00
10/11/2019 0.00
10/12/2019 0.00
10/13/2019 0.00
10/14/2019 0.00
10/15/2019 0.00
10/16/2019 0.00
10/17/2019 0.00
10/18/2019 0.00
10/19/2019 0.00
10/20/2019 0.00
10/21/2019 0.00
10/22/2019 0.00
10/23/2019 0.00
10/24/2019 0.00
10/25/2019 0.00
10/26/2019 0.00
10/27/2019 0.00
10/28/2019 0.00
10/29/2019 0.00
10/30/2019 0.00
10/31/2019 0.00
11/1/2019 0.00
11/2/2019 0.00
11/3/2019 0.00
11/4/2019 0.00
11/5/2019 0.00
11/6/2019 0.00
11/7/2019 0.00
11/8/2019 0.00
11/9/2019 0.00
11/10/2019 0.00
11/11/2019 0.00
11/12/2019 0.00
11/13/2019 0.00
11/14/2019 0.00
11/15/2019 0.00
11/16/2019 0.00
11/17/2019 0.00
11/18/2019 0.00
11/19/2019 0.00
11/20/2019 0.00
11/21/2019 0.00
11/22/2019 0.00
11/23/2019 0.00
11/24/2019 0.00
11/25/2019 0.00
11/26/2019 0.00
11/27/2019 0.23
11/28/2019 0.05
11/29/2019 0.16
11/30/2019 0.01
12/1/2019 0.86
12/2/2019 1.17
12/3/2019 0.03
12/4/2019 0.25
12/5/2019 0.40
12/6/2019 0.00
12/7/2019 0.03
12/8/2019 0.16
12/9/2019 0.15
12/10/2019 0.00
12/11/2019 0.00
12/12/2019 0.00
12/13/2019 0.00
12/14/2019 0.07
12/15/2019 0.00
12/16/2019 0.00
12/17/2019 0.00
12/18/2019 0.02
12/19/2019 0.00
12/20/2019 0.00
12/21/2019 0.00
12/22/2019 0.00
12/23/2019 0.36
12/24/2019 0.05
12/25/2019 0.00
12/26/2019 0.15
12/27/2019 0.00
12/28/2019 0.00
12/29/2019 0.00
12/30/2019 0.01
12/31/2019 0.00
Day of YearDaily PrcpMultiday Prcp
1/1/2020 0.00
1/2/2020 0.00
1/3/2020 0.00
1/4/2020 0.00
1/5/2020 0.00
1/6/2020 0.00
1/7/2020 0.00
1/8/2020 0.00
1/9/2020 0.00
1/10/2020 0.40
1/11/2020 0.00
1/12/2020 0.00
1/13/2020 0.00
1/14/2020 0.00
1/15/2020 T
1/16/2020 0.00
1/17/2020 0.39
1/18/2020 0.00
1/19/2020 0.00
1/20/2020 0.00
1/21/2020 0.00
1/22/2020 0.06
1/23/2020 0.00
1/24/2020 0.00
1/25/2020 0.00
1/26/2020 0.07
1/27/2020 0.00
1/28/2020 0.00
1/29/2020 0.00
1/30/2020 0.00
1/31/2020 0.00
2/1/2020 0.00
2/2/2020 0.00
2/3/2020 0.00
2/4/2020 0.00
2/5/2020 0.00
2/6/2020 0.00
2/7/2020 0.00
2/8/2020 0.00
2/9/2020 0.00
2/10/2020 0.00
2/11/2020 0.00
2/12/2020 0.00
2/13/2020 0.00
2/14/2020 0.00
2/15/2020 0.00
2/16/2020 0.00
2/17/2020 0.00
2/18/2020 0.00
2/19/2020 0.00
2/20/2020 0.00
2/21/2020 0.00
2/22/2020 0.01
2/23/2020 0.00
2/24/2020 0.00
2/25/2020 0.00
2/26/2020 0.00
2/27/2020 0.00
2/28/2020 0.00
2/29/2020 0.00
3/1/2020 0.00
3/2/2020 0.00
3/3/2020 0.00
3/4/2020 0.00
3/5/2020 0.00
3/6/2020 0.00
3/7/2020 0.00
3/8/2020 0.00
3/9/2020 0.00
3/10/2020 0.00
3/11/2020 0.12
3/12/2020 0.00
3/13/2020 0.00
3/14/2020 0.00
3/15/2020 T
3/16/2020 0.18
3/17/2020 0.85
3/18/2020 0.00
3/19/2020 T
3/20/2020 0.02
3/21/2020 0.13
3/22/2020 0.04
3/23/2020 0.27
3/24/2020 0.03
3/25/2020 0.30
3/26/2020 0.14
3/27/2020 0.00
3/28/2020 0.00
3/29/2020 0.06
3/30/2020 0.00
3/31/2020 0.00
Day of YearDaily PrcpMultiday Prcp
4/1/2020 0.00
4/2/2020 0.00
4/3/2020 0.00
4/4/2020 0.00
4/5/2020 0.07
4/6/2020 0.85
4/7/2020 0.19
4/8/2020 0.15
4/9/2020 0.12
4/10/2020 T
4/11/2020 0.00
4/12/2020 0.00
4/13/2020 0.00
4/14/2020 0.00
4/15/2020 0.00
4/16/2020 0.00
4/17/2020 0.00
4/18/2020 0.01
4/19/2020 0.00
4/20/2020 0.00
4/21/2020 0.02
4/22/2020 0.00
4/23/2020 0.00
4/24/2020 0.00
4/25/2020 0.00
4/26/2020 0.00
4/27/2020 0.00
4/28/2020 0.00
4/29/2020 0.00
4/30/2020 0.00
5/1/2020 0.00
5/2/2020 0.00
5/3/2020 0.00
5/4/2020 0.00
5/5/2020 0.00
5/6/2020 0.00
5/7/2020 0.00
5/8/2020 0.00
5/9/2020 0.00
5/10/2020 0.00
5/11/2020 0.00
5/12/2020 T
5/13/2020 0.00
5/14/2020 0.00
5/15/2020 0.00
5/16/2020 0.00
5/17/2020 0.00
5/18/2020 0.18
5/19/2020 0.36
5/20/2020 0.00
5/21/2020 0.00
5/22/2020 0.00
5/23/2020 0.00
5/24/2020 0.00
5/25/2020 0.00
5/26/2020 0.00
5/27/2020 0.00
5/28/2020 0.00
5/29/2020 0.00
5/30/2020 0.00
5/31/2020 0.00
6/1/2020 0.00
6/2/2020 0.00
6/3/2020 0.00
6/4/2020 0.00
6/5/2020 0.00
6/6/2020 0.00
6/7/2020 0.00
6/8/2020 0.00
6/9/2020 0.00
6/10/2020 0.00
6/11/2020 0.00
6/12/2020 0.00
6/13/2020 0.00
6/14/2020 0.00
6/15/2020 0.00
6/16/2020 0.00
6/17/2020 0.00
6/18/2020 0.00
6/19/2020 0.00
6/20/2020 0.00
6/21/2020 0.00
6/22/2020 0.00
6/23/2020 0.00
6/24/2020 0.00
6/25/2020 0.00
6/26/2020 0.00
6/27/2020 0.00
6/28/2020 0.00
6/29/2020 0.00
6/30/2020 0.00
Day of YearDaily PrcpMultiday Prcp
7/1/2020 0.00
7/2/2020 0.00
7/3/2020 0.00
7/4/2020 0.00
7/5/2020 0.00
7/6/2020 0.00
7/7/2020 0.00
7/8/2020 0.00
7/9/2020 0.00
7/10/2020 0.00
7/11/2020 0.00
7/12/2020 0.00
7/13/2020 0.00
7/14/2020 0.00
7/15/2020 0.00
7/16/2020 0.00
7/17/2020 0.00
7/18/2020 0.00
7/19/2020 0.00
7/20/2020 0.00
7/21/2020 0.00
7/22/2020 0.00
7/23/2020 0.00
7/24/2020 0.00
7/25/2020 0.00
7/26/2020 0.00
7/27/2020 0.00
7/28/2020 0.00
7/29/2020 0.00
7/30/2020 0.00
7/31/2020 0.00
8/1/2020 0.00
8/2/2020 0.00
8/3/2020 0.00
8/4/2020 0.00
8/5/2020 0.00
8/6/2020 0.00
8/7/2020 0.00
8/8/2020 0.00
8/9/2020 0.00
8/10/2020 0.00
8/11/2020 0.00
8/12/2020 0.00
8/13/2020 0.00
8/14/2020 T
8/15/2020 0.00
8/16/2020 T
8/17/2020 0.00
8/18/2020 0.00
8/19/2020 0.00
8/20/2020 0.00
8/21/2020 0.00
8/22/2020 0.00
8/23/2020 0.00
8/24/2020 0.00
8/25/2020 0.00
8/26/2020 0.00
8/27/2020 0.00
8/28/2020 0.00
8/29/2020 0.00
8/30/2020 0.00
8/31/2020 0.00
9/1/2020 0.00
9/2/2020 0.00
9/3/2020 0.00
9/4/2020 0.00
9/5/2020 0.00
9/6/2020 0.00
9/7/2020 0.00
9/8/2020 0.00
9/9/2020 0.00
9/10/2020 0.00
9/11/2020 0.00
9/12/2020 0.00
9/13/2020 0.00
9/14/2020 0.00
9/15/2020 0.00
9/16/2020 0.00
9/17/2020 0.00
9/18/2020 0.00
9/19/2020 0.00
9/20/2020 0.00
9/21/2020 0.00
9/22/2020 0.00
9/23/2020 0.00
9/24/2020 0.00
9/25/2020 0.00
9/26/2020 0.00
9/27/2020 0.00
9/28/2020 0.00
9/29/2020 0.00
9/30/2020 0.00



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/1/2019 7:00 AM 0.00 0.0 M M M
10/2/2019 7:00 AM 0.00 0.0 M M M
10/3/2019 7:00 AM 0.00 0.0 M M M
10/4/2019 7:00 AM 0.00 0.0 M M M
10/5/2019 7:00 AM 0.00 0.0 M M M
10/6/2019 7:00 AM 0.00 0.0 M M M
10/7/2019 7:00 AM 0.00 0.0 M M M
10/8/2019 7:00 AM 0.00 0.0 M M M
10/9/2019 7:00 AM 0.00 0.0 M M M
10/10/2019 7:00 AM 0.00 0.0 M M M
10/11/2019 7:00 AM 0.00 0.0 M M M
10/12/2019 7:00 AM 0.00 0.0 M M M
10/13/2019 7:00 AM 0.00 0.0 M M M
10/14/2019 7:00 AM 0.00 0.0 M M M
10/15/2019 7:00 AM 0.00 0.0 M M M
10/16/2019 7:00 AM 0.00 0.0 M M M
10/17/2019 7:00 AM 0.00 0.0 M M M
10/18/2019 7:00 AM 0.00 0.0 M M M
10/19/2019 7:00 AM 0.00 0.0 M M M
10/20/2019 7:00 AM 0.00 0.0 M M M
10/21/2019 7:00 AM 0.00 0.0 M M M
10/22/2019 7:00 AM 0.00 0.0 M M M
10/23/2019 7:00 AM 0.00 0.0 M M M
10/24/2019 7:00 AM 0.00 0.0 M M M
10/25/2019 7:00 AM 0.00 0.0 M M M
10/26/2019 7:00 AM 0.00 0.0 M M M
10/27/2019 7:00 AM 0.00 0.0 M M M
10/28/2019 7:00 AM 0.00 0.0 M M M
10/29/2019 7:00 AM 0.00 0.0 M M M
10/30/2019 7:00 AM 0.00 0.0 M M M
10/31/2019 7:00 AM 0.00 0.0 M M M
11/1/2019 7:00 AM 0.00 0.0 M M M
11/2/2019 7:00 AM 0.00 0.0 M M M
11/3/2019 7:00 AM 0.00 0.0 M M M
11/4/2019 7:00 AM 0.00 0.0 M M M
11/5/2019 7:00 AM 0.00 0.0 M M M
11/6/2019 7:00 AM 0.00 0.0 M M M
11/7/2019 7:00 AM 0.00 0.0 M M M
11/8/2019 7:00 AM 0.00 0.0 M M M
11/9/2019 7:00 AM 0.00 0.0 M M M
11/10/2019 7:00 AM 0.00 0.0 M M M
11/11/2019 7:00 AM 0.00 0.0 M M M
11/12/2019 7:00 AM 0.00 0.0 M M M
11/13/2019 7:00 AM 0.00 0.0 M M M
11/14/2019 7:00 AM 0.00 0.0 M M M
11/15/2019 7:00 AM 0.00 0.0 M M M
11/16/2019 7:00 AM 0.00 0.0 M M M
11/17/2019 7:00 AM 0.00 0.0 M M M
11/18/2019 7:00 AM 0.00 0.0 M M M
11/19/2019 7:00 AM 0.00 0.0 M M M
11/20/2019 7:00 AM 0.00 0.0 M M M
11/21/2019 7:00 AM 0.00 0.0 M M M
11/22/2019 7:00 AM 0.00 0.0 M M M
11/23/2019 7:00 AM 0.00 0.0 M M M
11/24/2019 7:00 AM 0.00 0.0 M M M
11/25/2019 7:00 AM 0.00 0.0 M M M
11/26/2019 7:00 AM 0.00 0.0 M M M
11/27/2019 7:00 AM 0.23 M M M M First rain of the cool season with 0.23" falling in light rain through the night through obs time the morning of Wednesday the 27th.
11/28/2019 7:00 AM 0.05 M M M M Intermittent light rain showers occurred during the previous 24-hour observation period as Low Pressure centered over NorCal maintained instability showers. Continued southwest flow brought on-going orographic snow onto the Southern Sierra Nevada.
11/29/2019 7:00 AM 0.16 M M M M Intermittent light rain showers continued to occur for the observation period with most of the accumulation occurring in the mid-afternoon hours of Thanksgiving Day the 28th.
11/30/2019 7:00 AM 0.01 M M M M Intermittent very light rainshowers continued through the observation period with minimal accumulation of rain. Continued orographics on the Southern Sierra Nevada over the period as well.
12/1/2019 7:00 AM 0.86 M M M M After intermittent very light rain ended early Saturday morning the 30th around 0700PST..Obs time.. a period of rain occurred over 4 hours during the afternoon. After a respite of 4 hours light to moderate rain then occurred overnight from 2030PST and tapered off to sprinkles at obs time 0700PST Sunday the 1st.
12/2/2019 7:00 AM 1.17 M M M M Precip accumulation in light to moderate rain into the late afternoon hours on Sunday the 1st. Intermittent light rain began again the late evening hours through obs time with another 0.05". The soil is now saturated with puddles of water on firmer ground. Bands of heavier rainfall passed just NW of this station during the 24-hr obs period affecting the Southern Merced County area with larger amounts of rain. Strong orographics continue for the South Sierra Nevada in the SW flow aloft.
12/3/2019 7:00 AM 0.03 M M M M Moist southwest flow aloft continued cloudiness through Monday Dec 2nd with clearing late evening. Intermittent light rain showers occurred during the day but with clearing before midnight and the moist ground...dense fog formed by midnight and persisted through obs time.
12/4/2019 7:00 AM 0.25 M M M M Light to brief moderate rain began in the very early morning hours through a long-lived persistent day-long fog throughout the San Joaquin Valley and continued through obs time. A closed low off the SoCal Coast continued SW flow over the area with good orographic precipitation for the adjacent South Sierra Nevada.
12/5/2019 7:00 AM 0.40 M M M M Soils now saturated in the area with ponding in low spots on firm ground. 7-Day precipitation total 3.16" ... roughly 1/4 of annual average rainfall.
12/6/2019 7:00 AM 0.00 0.0 M M M
12/7/2019 7:00 AM 0.03 M M M M Fair skies Friday the 6th led to increasing cloudiness early the morning of the 7th with very light rain beginning before dawn.
12/8/2019 7:00 AM 0.16 M M M M Frontal passage provided steady light to occasionally moderate rain from mid-morning to very early afternoon Saturday morning the 7th.
12/9/2019 7:00 AM 0.15 M M M M Steady light rain occurred in the late morning hours of Sunday the 8th at the station. While afternoon convection brought locally heavy rain showers in the South-Central and South San Joaquin valley Sunday afternoon...no rain fell at this station despite instability cloudiness all around. Clearing overnight led to dense fog formation after midnight for the Central and South San Joaquin Valley the morning of the 9th.
12/10/2019 7:00 AM 0.00 0.0 M M M Monday the 9th after patchy morning fog lifted to SCT to BKN stratus. Clearing Monday night resulted in extensive, dense morning fog throughout the San Joaquin Valley Tuesday morning the 10th.
12/11/2019 7:00 AM 0.00 0.0 M M M
12/12/2019 7:00 AM 0.00 0.0 M M M Some mid and high clouds were present above the moist low-level in the San Joaquin Valley the afternoon of the 11th ... but enough breaks in the cloud cover provided sufficient radiational cooling for patchy dense fog Thursday morning the 12th.
12/13/2019 7:00 AM 0.00 0.0 M M M Mild conditions prevailed for the Central San Joaquin Valley for much of the afternoon of Thursday the 12th and into Friday the 13th although increasing cloudiness with light rain showers occurred over Northern California.
12/14/2019 7:00 AM 0.07 M M M M A moistening upper air brought increasing cloudiness to the North and Central San Joaquin Valley during the evening of Friday the 13th. Light rain showers brought measurable rain between 2300 to 0200 PST with only intermittent very light showers until 0300 PST.
12/15/2019 7:00 AM 0.00 0.0 M M M The band of moisture that brought rain showers around dawn Saturday the 14th moved SE by late morning with subsequent afternoon partly cloudy skies and then overnight clear skies.
12/16/2019 7:00 AM 0.00 0.0 M M M
12/17/2019 7:00 AM 0.00 0.0 M M M
12/18/2019 7:00 AM 0.02 M M M M A weak frontal passage occurred in the early morning hours of Wed the 18th with light rain short-lived before giving way to cleared post-frontal conditions.
12/19/2019 7:00 AM 0.00 0.0 M M M
12/20/2019 7:00 AM 0.00 0.0 M M M
12/21/2019 7:00 AM 0.00 0.0 M M M
12/22/2019 7:00 AM 0.00 0.0 M M M
12/23/2019 7:00 AM 0.36 M M M M Light rain began mid-morning Sunday the 22nd with frontal rainfall ending by mid-afternoon ... and then continued intermittent light rain shower activity to mid-night.
12/24/2019 7:00 AM 0.05 M M M M Light rain occurred at the station in the mid- to late-morning hours as an upper Low off the South-Central California Coast brought moisture south-to-north over the region.
12/25/2019 7:00 AM 0.00 0.0 M M M Unsettled weather continued north of the obs area Christmas Eve but no rain occurred at the obs point.
12/26/2019 7:00 AM 0.15 M M M M A weak frontal passage Wednesday Christmas morning brought only 0.02" of rain ending by 0845 PST. Wrap-around moisture from the south reached northward to the Chowchilla area with light rain by 2330 PST Christmas Night with an overnight amount of 0.07" ... the rain tapered to very light by 0500 PST ... and ended around dawn Thursday the 26th.
12/27/2019 7:00 AM 0.00 0.0 M M M Light rain ended prior to obs time Thursday the 26th but low clouds lingered to mid-day. Clearing overnight lead to dense fog formation by 0200 PST Friday the 27th. The upper low moving over SoCal Thursday deposited a foot of snow in parts of the Tehachapi Mountains clogging I-5 and Highway 58. Total rainfall for November and December..thus far.. at the station... 0.45" and 3.64" respectively.
12/28/2019 7:00 AM 0.00 0.0 M M M
12/29/2019 7:00 AM 0.00 0.0 M M M
12/30/2019 7:00 AM 0.01 M M M M Very light rain occurred before dawn early Monday morning the 30th with low stratus and light fog persisting through the morning hours after obs time.
12/31/2019 7:00 AM 0.00 0.0 M M M
1/1/2020 7:00 AM 0.00 0.0 M M M Dense but only patchy morning fog in the vicinity developed overnight. Station December rainfall total ... 3.78” ... much above normal or about 1/3rd the annual average!
1/2/2020 7:00 AM 0.00 0.0 M M M
1/3/2020 7:00 AM 0.00 0.0 M M M Dense overnight fog developed due to high pressure aloft and copious amount of surface moisture.
1/4/2020 7:00 AM 0.00 0.0 M M M Afternoon clearing Friday the 3rd continued overnight at the obs site. Minimum temp around 40F.
1/5/2020 7:00 AM 0.00 0.0 M M M
1/6/2020 7:00 AM 0.00 0.0 M M M
1/7/2020 7:00 AM 0.00 0.0 M M M
1/8/2020 7:00 AM 0.00 0.0 M M M
1/9/2020 7:00 AM 0.00 0.0 M M M
1/10/2020 7:00 AM 0.40 M M M M Frontal passage through Central California brought light rain in the morning hours after dawn on Thursday the 9th. FROPA occurred around 0900-1000 PST with moderate rain at times through that period.
1/11/2020 7:00 AM 0.00 0.0 M M M
1/12/2020 7:00 AM 0.00 0.0 M M M
1/13/2020 7:00 AM 0.00 0.0 M M M
1/14/2020 7:00 AM 0.00 0.0 M M M
1/15/2020 7:00 AM T 0.0 M M M A very weak frontal band passed the North San Joaquin Valley in the mid-morning hours of Tuesday the 14th. Precipitation extended no further south than Chowchilla's latitude. A few hundredths were noted on the CA Central Coast and likewise in the Sierra NE of the obs site. At the obs site only a few sprinkles were noted.
1/16/2020 7:00 AM 0.00 0.0 M M M
1/17/2020 7:00 AM 0.39 M M M M With a negative-tilt trof aloft providing energy a vigorous FROPA occurred through Central California mid-afternoon Thursday the 16th. Developing squall-like characteristics occurred from about Chowchilla and then southward through the SJValley. FROPA occurred with moderate to heavy rain around 1500PST with winds shifting from SE to WNW at that time with area gusts to 35Kts.
1/18/2020 7:00 AM 0.00 0.0 M M M
1/19/2020 7:00 AM 0.00 0.0 M M M
1/20/2020 7:00 AM 0.00 0.0 M M M
1/21/2020 7:00 AM 0.00 0.0 M M M
1/22/2020 7:00 AM 0.06 M M M M Drizzle / very light rain began just after midnight with a very slow accumulation and ended before dawn Wednesday morning the 22nd.
1/23/2020 7:00 AM 0.00 0.0 M M M After a weak frontal passage the day before...clearing led to dense morning fog in the area by observation time.
1/24/2020 7:00 AM 0.00 0.0 M M M Dense Fog at observation time.
1/25/2020 7:00 AM 0.00 0.0 M M M Dense Fog formed overnight with visibility at observation time of 200 feet.
1/26/2020 7:00 AM 0.07 M M M M Light rain occurred with a weak frontal passage just before observation time on Sunday the 26th.
1/27/2020 7:00 AM 0.00 0.0 M M M
1/28/2020 7:00 AM 0.00 0.0 M M M
1/29/2020 7:00 AM 0.00 0.0 M M M
1/30/2020 7:00 AM 0.00 0.0 M M M
1/31/2020 7:00 AM 0.00 0.0 M M M
2/1/2020 7:00 AM 0.00 0.0 M M M
2/2/2020 7:00 AM 0.00 0.0 M M M
2/3/2020 7:00 AM 0.00 0.0 M M M A Dry Coldfrontal passage Sunday midday Feb 2nd with gusty north wind to 35MPH has brought dewpoints in the mid 20sF into the San Joaquin Valley.
2/4/2020 7:00 AM 0.00 0.0 M M M
2/5/2020 7:00 AM 0.00 0.0 M M M
2/6/2020 7:00 AM 0.00 0.0 M M M
2/7/2020 7:00 AM 0.00 0.0 M M M
2/8/2020 7:00 AM 0.00 0.0 M M M
2/9/2020 7:00 AM 0.00 0.0 M M M
2/10/2020 7:00 AM 0.00 0.0 M M M
2/11/2020 7:00 AM 0.00 0.0 M M M
2/12/2020 7:00 AM 0.00 0.0 M M M
2/13/2020 7:00 AM 0.00 0.0 M M M
2/14/2020 7:00 AM 0.00 0.0 M M M
2/15/2020 7:00 AM 0.00 0.0 M M M
2/16/2020 7:00 AM 0.00 0.0 M M M
2/17/2020 7:00 AM 0.00 0.0 M M M
2/18/2020 7:00 AM 0.00 0.0 M M M
2/19/2020 7:00 AM 0.00 0.0 M M M
2/20/2020 7:00 AM 0.00 0.0 M M M
2/21/2020 7:00 AM 0.00 0.0 M M M
2/22/2020 7:00 AM 0.01 M M M M An upper low center passing south of the long-lasting ridge along the West Coast provided for very light, intermittent showers of rain overnight in the Region.
2/23/2020 7:00 AM 0.00 0.0 M M M
2/24/2020 7:00 AM 0.00 0.0 M M M
2/25/2020 7:00 AM 0.00 0.0 M M M
2/26/2020 7:00 AM 0.00 0.0 M M M
2/27/2020 7:00 AM 0.00 0.0 M M M An extended mid-winter dry spell from mid-January and to extend through February setting up drought conditions for the current water year.
2/28/2020 7:00 AM 0.00 0.0 M M M
2/29/2020 7:00 AM 0.00 0.0 M M M
3/1/2020 7:00 AM 0.00 0.0 M M M
3/2/2020 7:00 AM 0.00 0.0 M M M
3/3/2020 7:00 AM 0.00 0.0 M M M
3/4/2020 7:00 AM 0.00 0.0 M M M
3/5/2020 7:00 AM 0.00 0.0 M M M
3/6/2020 7:00 AM 0.00 0.0 M M M
3/7/2020 7:00 AM 0.00 0.0 M M M
3/8/2020 7:00 AM 0.00 0.0 M M M
3/9/2020 7:00 AM 0.00 0.0 M M M
3/10/2020 7:00 AM 0.00 0.0 M M M
3/11/2020 6:00 AM 0.12 M M M M An upper low pressure area began crossing Southern California Tuesday the 10th and progressed eastward very slowly during the obs period. Cloudiness and instability showers spread northward late afternoon into Central California. Moderate rain occurred within the light showers from 1945 to 2100PDT time period.
3/12/2020 7:00 AM 0.00 0.0 M M M
3/13/2020 7:00 AM 0.00 0.0 M M M
3/14/2020 7:00 AM 0.00 0.0 M M M
3/15/2020 7:00 AM T M M M M Instability rain sprinkles occurred during the afternoon of Saturday the 14th as a very weak frontal passage occurred over the region.
3/16/2020 7:00 AM 0.18 M M M M Low pressure off the CA/OR Coast with a very cold core aloft (-34) is swinging moisture in a cyclonic circulation through the obs period. Chowchilla was the southern extent of relatively substantial rain with Merced having several tenths of an inch and Madera less than a tenth.
3/17/2020 7:00 AM 0.85 M M M M A classic mid-latitude wave pushed through Central California from Sunday morning the 16th through the evening hours. Very light rain began before observation time Sunday morning at the obs site with light to moderate rain in the cold-frontal passage in the late afternoon to early evening. Total rain event at the station is 1.03" (Sunday calendar day).
3/18/2020 7:00 AM 0.00 0.0 M M M
3/19/2020 6:00 AM T M M M M A moist lower atmosphere combined with an upper trough swinging over the region brought drizzle starting just before dawn on Thursday the 19th.
3/20/2020 7:00 AM 0.02 M M M M Light rain tapered off mid-morning Thursday the 19th at the obs site with no additional rain for the observation time period. But some low-topped convection developed around the region in the mid- to late-afternoon hours.
3/21/2020 7:00 AM 0.13 M M M M A short-wave trof passing through the region in the ours around dawn provided light rain.
3/22/2020 7:00 AM 0.04 M M M M Light rain showers occurred through most of the morning with intermittent light rain/drizzle. The precipitation tapered off by late morning Saturday the 21st.
3/23/2020 7:00 AM 0.27 M M M M Very light rain occurred early morning Sunday the 22nd with 0.02" falling between 0845-0930PDT. Steady light rain began at 2315PDT and rained through the night to 0400PDT with an additional 0.25".
3/24/2020 7:00 AM 0.03 M M M M After a brief period of light rain in the morning of Monday the 23rd the rest of the day had intermittent light sprinkles as the airmass remained unstable in the region.
3/25/2020 7:00 AM 0.30 M M M M An instability line moved over the obs site from the west at 2002PDT with RW- and then RW+ from 2004 to 2030 and 0.24" in that period. RW- until 2053PDT providing another 0.04". Then in the early morning of the 25th between 0200-0330 RW- added another 0.02".
3/26/2020 7:00 AM 0.14 M M M M Rainfall periods Wednesday the 25th: RW- 0741-0748PDT 0.01”; 1147-1210PDT RW-Trace; 1810-1830PDT TRW+ 0.12” with BB-size hail mixed with rain; 1830-1905PDT RW- Trace; 2215-2245PDT RW- 0.01”. Thunder at 1828PDT, 1836PDT, and 1855PDT. March station rain total through this date at 2.04”.
3/27/2020 7:00 AM 0.00 0.0 M M M
3/28/2020 7:00 AM 0.00 0.0 M M M
3/29/2020 7:00 AM 0.06 M M M M A weak front passed through the region in the very early morning hours of Sunday the 29th.
3/30/2020 7:00 AM 0.00 0.0 M M M
3/31/2020 7:00 AM 0.00 0.0 M M M
4/1/2020 7:00 AM 0.00 0.0 M M M
4/2/2020 7:00 AM 0.00 0.0 M M M
4/3/2020 7:00 AM 0.00 0.0 M M M
4/4/2020 7:00 AM 0.00 0.0 M M M
4/5/2020 7:00 AM 0.07 0.0 M M M As low pressure off the Northern CA Coast began to move SE toward Central California..increasing cloudiness with an oncoming Warm Front led to intermittent sprinkles starting at 4:45PM PDT. The intermittent trace amounts of rain in very light showers continued until steady light rain began at 8:08PM PDT in the evening of the 4th. The rain associated with a weak Cold Frontal passage provided 0.07" of precipitation at the station.
4/6/2020 7:00 AM 0.85 M M M M Intermittent light sprinkles began after dawn early morning Sunday the 5th and then R- by late morning through overnight to just before dawn Monday the 6th.
4/7/2020 7:00 AM 0.19 M M M M Afternoon convection occurred around the observation site with thunder occurring mid-afternoon Monday the 6th. Measurable RW+/- began during the mid- to late-afternoon but intermittent sprinkles with only Trace amounts lingered until mid-evening .
4/8/2020 7:00 AM 0.15 M M M M Warm-frontal passage in the very early morning hours brought 0.14” of rain with post-frontal RW- giving another 0.01” before obs time.
4/9/2020 7:00 AM 0.12 M M M M After warm-frontal passage very early Wednesday the 8th, a very slowly moving cold-front moved into the Central San Joaquin Valley just after midnight with intermittent drizzle and light rain.
4/10/2020 7:00 AM T 0.0 M M M After overnight rainfall earlier in the morning intermittent drizzle continued to mid-morning before ending.
4/11/2020 7:00 AM 0.00 0.0 M M M
4/12/2020 7:00 AM 0.00 0.0 M M M
4/13/2020 7:00 AM 0.00 0.0 M M M
4/14/2020 7:00 AM 0.00 0.0 M M M
4/15/2020 7:00 AM 0.00 0.0 M M M
4/16/2020 7:00 AM 0.00 0.0 M M M
4/17/2020 7:00 AM 0.00 0.0 M M M
4/18/2020 7:00 AM 0.01 M M M M The Central San Joaquin Valley had Friday the 17th late afternoon through late evening convection scattered around the region with areas receiving locally heavy rain showers. The thunderstorms tapered off to overnight sprinkles and light rain ending well before dawn at the station.
4/19/2020 7:00 AM 0.00 0.0 M M M
4/20/2020 7:00 AM 0.00 0.0 M M M
4/21/2020 7:00 AM 0.02 M M M M A weak short-wave with minimal moisture passed over the area Monday morning the 20th with just a few light rain showers.
4/22/2020 7:00 AM 0.00 0.0 M M M
4/23/2020 7:00 AM 0.00 0.0 M M M
4/24/2020 7:00 AM 0.00 0.0 M M M
4/25/2020 7:00 AM 0.00 0.0 M M M
4/26/2020 7:00 AM 0.00 0.0 M M M
4/27/2020 7:00 AM 0.00 0.0 M M M
4/28/2020 7:00 AM 0.00 0.0 M M M
4/29/2020 7:00 AM 0.00 0.0 M M M
4/30/2020 7:00 AM 0.00 0.0 M M M Precipitation for the month of April ... 1.42"
5/1/2020 7:00 AM 0.00 0.0 M M M
5/2/2020 7:00 AM 0.00 0.0 M M M
5/3/2020 7:00 AM 0.00 0.0 M M M
5/4/2020 7:00 AM 0.00 0.0 M M M
5/5/2020 7:00 AM 0.00 0.0 M M M
5/6/2020 7:00 AM 0.00 0.0 M M M
5/7/2020 7:00 AM 0.00 0.0 M M M
5/8/2020 7:00 AM 0.00 0.0 M M M
5/9/2020 7:00 AM 0.00 0.0 M M M
5/10/2020 7:00 AM 0.00 0.0 M M M
5/11/2020 7:00 AM 0.00 0.0 M M M
5/12/2020 7:00 AM T M M M M Zonal flow over Northern California resulted in frontal passage over the north state. The front dissipated as it reached the station latitude. Only intermittent sprinkles occurred at the station during the late morning hours.
5/13/2020 7:00 AM 0.00 0.0 M M M
5/14/2020 7:00 AM 0.00 0.0 M M M
5/15/2020 7:00 AM 0.00 0.0 M M M
5/16/2020 7:00 AM 0.00 0.0 M M M
5/17/2020 7:00 AM 0.00 0.0 M M M
5/18/2020 7:00 AM 0.18 M M M M Rain from an upper low over Northern California began in the hours just before dawn at the station.
5/19/2020 6:00 AM 0.36 M M M M A closed..cold core upper low pressure center over Northern California brought steady rain beginning before observation time Monday May 18th. That rain continued until late morning. Then the instability associated with the upper low brought TRW-/RW- into the early evening hours before subsiding with clearing overnight to obs time Tuesday the 19th. Rain ended at 1000PDT with 0.20"...RW- 1425-1450PDT 0.03"...TRW- 1610-1725PDT 0.12"...Intermittent RW- 1750-1830 0.01".
5/20/2020 7:00 AM 0.00 0.0 M M M
5/21/2020 7:00 AM 0.00 0.0 M M M
5/22/2020 7:00 AM 0.00 0.0 M M M
5/23/2020 7:00 AM 0.00 0.0 M M M
5/24/2020 7:00 AM 0.00 0.0 M M M
5/25/2020 7:00 AM 0.00 0.0 M M M
5/26/2020 7:00 AM 0.00 0.0 M M M
5/27/2020 7:00 AM 0.00 0.0 M M M
5/28/2020 7:00 AM 0.00 0.0 M M M
5/29/2020 7:00 AM 0.00 0.0 M M M
5/30/2020 7:00 AM 0.00 0.0 M M M
5/31/2020 7:00 AM 0.00 0.0 M M M
6/1/2020 7:00 AM 0.00 0.0 M M M
6/2/2020 7:00 AM 0.00 0.0 M M M
6/3/2020 7:00 AM 0.00 0.0 M M M
6/4/2020 7:00 AM 0.00 0.0 M M M
6/5/2020 7:00 AM 0.00 0.0 M M M
6/6/2020 7:00 AM 0.00 0.0 M M M
6/7/2020 7:00 AM 0.00 0.0 M M M
6/8/2020 7:00 AM 0.00 0.0 M M M
6/9/2020 7:00 AM 0.00 0.0 M M M
6/10/2020 7:00 AM 0.00 0.0 M M M
6/11/2020 7:00 AM 0.00 0.0 M M M
6/12/2020 7:00 AM 0.00 0.0 M M M
6/13/2020 7:00 AM 0.00 0.0 M M M
6/14/2020 7:00 AM 0.00 0.0 M M M
6/15/2020 7:00 AM 0.00 0.0 M M M
6/16/2020 7:00 AM 0.00 0.0 M M M
6/17/2020 7:00 AM 0.00 0.0 M M M
6/18/2020 7:00 AM 0.00 0.0 M M M
6/19/2020 7:00 AM 0.00 0.0 M M M
6/20/2020 7:00 AM 0.00 0.0 M M M
6/21/2020 7:00 AM 0.00 0.0 M M M
6/22/2020 7:00 AM 0.00 0.0 M M M
6/23/2020 7:00 AM 0.00 0.0 M M M
6/24/2020 7:00 AM 0.00 0.0 M M M
6/25/2020 7:00 AM 0.00 0.0 M M M
6/26/2020 7:00 AM 0.00 0.0 M M M
6/27/2020 7:00 AM 0.00 0.0 M M M
6/28/2020 7:00 AM 0.00 0.0 M M M
6/29/2020 7:00 AM 0.00 0.0 M M M
6/30/2020 7:00 AM 0.00 0.0 M M M
7/1/2020 7:00 AM 0.00 0.0 M M M
7/2/2020 7:00 AM 0.00 0.0 M M M
7/3/2020 7:00 AM 0.00 0.0 M M M
7/4/2020 7:00 AM 0.00 0.0 M M M
7/5/2020 7:00 AM 0.00 0.0 M M M
7/6/2020 7:00 AM 0.00 0.0 M M M
7/7/2020 7:00 AM 0.00 0.0 M M M
7/8/2020 7:00 AM 0.00 0.0 M M M
7/9/2020 7:00 AM 0.00 0.0 M M M
7/10/2020 7:00 AM 0.00 0.0 M M M
7/11/2020 7:00 AM 0.00 0.0 M M M
7/12/2020 7:00 AM 0.00 0.0 M M M
7/13/2020 7:00 AM 0.00 0.0 M M M
7/14/2020 7:00 AM 0.00 0.0 M M M
7/15/2020 7:00 AM 0.00 0.0 M M M
7/16/2020 7:00 AM 0.00 0.0 M M M
7/17/2020 7:00 AM 0.00 0.0 M M M
7/18/2020 7:00 AM 0.00 0.0 M M M
7/19/2020 7:00 AM 0.00 0.0 M M M
7/20/2020 7:00 AM 0.00 0.0 M M M
7/21/2020 7:00 AM 0.00 0.0 M M M
7/22/2020 7:00 AM 0.00 0.0 M M M
7/23/2020 7:00 AM 0.00 0.0 M M M
7/24/2020 7:00 AM 0.00 0.0 M M M
7/25/2020 7:00 AM 0.00 0.0 M M M
7/26/2020 7:00 AM 0.00 0.0 M M M
7/27/2020 7:00 AM 0.00 0.0 M M M
7/28/2020 7:00 AM 0.00 0.0 M M M
7/29/2020 7:00 AM 0.00 0.0 M M M
7/30/2020 7:00 AM 0.00 0.0 M M M
7/31/2020 7:00 AM 0.00 0.0 M M M
8/1/2020 7:00 AM 0.00 0.0 M M M
8/2/2020 7:00 AM 0.00 0.0 M M M
8/3/2020 7:00 AM 0.00 0.0 M M M
8/4/2020 7:00 AM 0.00 0.0 M M M
8/5/2020 7:00 AM 0.00 0.0 M M M
8/6/2020 7:00 AM 0.00 0.0 M M M
8/7/2020 7:00 AM 0.00 0.0 M M M
8/8/2020 7:00 AM 0.00 0.0 M M M
8/9/2020 7:00 AM 0.00 0.0 M M M
8/10/2020 7:00 AM 0.00 0.0 M M M
8/11/2020 7:00 AM 0.00 0.0 M M M
8/12/2020 7:00 AM 0.00 0.0 M M M
8/13/2020 7:00 AM 0.00 0.0 M M M
8/14/2020 7:00 AM T 0.0 M M M Weak low pressure embedded below a dominant ridge along the West U.S. Coast advected tropical moisture over Central California during mid-afternoon Thursday the 13th. Only a few sprinkles occurred from mid-level instability cloudiness.
8/15/2020 7:00 AM 0.00 0.0 M M M Weak southerly flow aloft pushed high-based thunderstorms with accompanying dry lightning over the state. The situation initiated numerous fires leading to widespread smoke and tremendous forest and grassland acreage burned.
8/16/2020 7:00 AM T M M M M A weak low pressure circulation continued to push sub-tropical moisture over the Central San Joaquin Valley and adjacent mountain areas during Saturday the 15th. Convective temperatures were reached in the mid-to-late afternoon over the North San Joaquin Valley with a few sprinkles fror high cumuliform/alto-cumuliform clouds mid-afternoon at the station.
8/17/2020 7:00 AM 0.00 0.0 M M M
8/18/2020 7:00 AM 0.00 0.0 M M M
8/19/2020 7:00 AM 0.00 0.0 M M M
8/20/2020 7:00 AM 0.00 0.0 M M M
8/21/2020 7:00 AM 0.00 0.0 M M M
8/22/2020 7:00 AM 0.00 0.0 M M M
8/23/2020 7:00 AM 0.00 0.0 M M M
8/24/2020 7:00 AM 0.00 0.0 M M M
8/25/2020 7:00 AM 0.00 0.0 M M M
8/26/2020 7:00 AM 0.00 0.0 M M M
8/27/2020 7:00 AM 0.00 0.0 M M M
8/28/2020 7:00 AM 0.00 0.0 M M M
8/29/2020 7:00 AM 0.00 0.0 M M M
8/30/2020 7:00 AM 0.00 0.0 M M M
8/31/2020 7:00 AM 0.00 0.0 M M M
9/1/2020 7:00 AM 0.00 0.0 M M M
9/2/2020 7:00 AM 0.00 0.0 M M M
9/3/2020 7:00 AM 0.00 0.0 M M M
9/4/2020 7:00 AM 0.00 0.0 M M M
9/5/2020 7:00 AM 0.00 0.0 M M M
9/6/2020 7:00 AM 0.00 0.0 M M M Meteorological Note: Strong 600mb High Pressure centered over Central NV resulting in light southerly flow aloft over Central California. Exceptionally dry with lapse temperature Saturday afternoon the 5th up to the 500mb level for LAS Raob and 550mb level for VGB Raob. The Creek Fire at Big Creek burned up Edison School/SoCal Edison Quarters and rim of Shaver Lake.
9/7/2020 7:00 AM 0.00 0.0 M M M Smoke still a problem. Chowchilla Temperature Max the 7th 102F; the 6th 107F; and the 8th 108F.
9/8/2020 7:00 AM 0.00 0.0 M M M Smoke within the entire San Joaquin Valley Air Basin continues to be a problem with surface visibility as low as 1SM in mid-afternoon. Temp Max 95F and Min 70F.
9/9/2020 7:00 AM 0.00 0.0 M M M
9/10/2020 7:00 AM 0.00 0.0 M M M
9/11/2020 7:00 AM 0.00 0.0 M M M
9/12/2020 7:00 AM 0.00 0.0 M M M
9/13/2020 7:00 AM 0.00 0.0 M M M
9/14/2020 7:00 AM 0.00 0.0 M M M
9/15/2020 7:00 AM 0.00 0.0 M M M
9/16/2020 7:00 AM 0.00 0.0 M M M
9/17/2020 7:00 AM 0.00 0.0 M M M
9/18/2020 7:00 AM 0.00 0.0 M M M
9/19/2020 7:00 AM 0.00 0.0 M M M
9/20/2020 7:00 AM 0.00 0.0 M M M
9/21/2020 7:00 AM 0.00 0.0 M M M
9/22/2020 7:00 AM 0.00 0.0 M M M
9/23/2020 7:00 AM 0.00 0.0 M M M
9/24/2020 7:00 AM 0.00 0.0 M M M
9/25/2020 7:00 AM 0.00 0.0 M M M
9/26/2020 7:00 AM 0.00 0.0 M M M
9/27/2020 7:00 AM 0.00 0.0 M M M
9/28/2020 7:00 AM 0.00 0.0 M M M
9/29/2020 7:00 AM 0.00 0.0 M M M
9/30/2020 7:00 AM 0.00 0.0 M M M



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes



Observation Date Observation Time Notes Largest Stone Size Average Stone Size Smallest Stone Size Stone Consistency Duration Minutes Durration Accuracy Damage Timing More Rain than Hail Hail Started Largest Hail Started Angle of Impact Number of Stones on Pad Distance Between Stones on Pad Depth of Stones on Ground