Station Overview Station Location
Station Number NY-SL-11 Latitude 44.6814
Station Name Potsdam 0.9 NNW Longitude -74.9893
County St. Lawrence Elevation (ft) 443



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 09 3.81 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
Nov 09 3.52 1.71 5 1.71 5 0.00 0 0 5 0 0.5 1 1
Dec 09 2.79 1.74 17 0.60 4 1.14 13 3 3 0 8.5 4 5
Jan 10 2.52 9.89 14 1.25 6 8.64 8 2 6 0 4.8 4 1
Feb 10 2.14 1.27 13 1.27 13 0.00 0 0 11 2 13.3 11 2
March 10 2.38 1.91 7 0.70 2 1.21 5 2 2 0 0.0 0 0
April 10 3.04 2.43 12 0.87 6 1.56 6 2 5 0 0.0 0 0
May 10 3.29 1.48 14 0.53 2 0.95 12 5 2 0 0.0 0 0
June 10 3.65 5.41 23 1.54 4 3.87 19 6 4 0 0.0 0 0
July 10 3.79 3.87 13 0.00 0 3.87 13 3 0 0 0.0 0 0
Aug 10 3.71 6.30 17 0.06 1 6.24 16 2 1 0 0.0 0 0
Sept 10 4.08 0.00 9 0.00 0 0.00 9 0 0 0 0.0 0 0
Water Year Totals: 38.72" 36.01" 144 days 8.53" 43 27.48" 101 days 25 39 days 2 days 27.1" 20 days 9 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
10/1/2009
10/2/2009
10/3/2009
10/4/2009
10/5/2009
10/6/2009
10/7/2009
10/8/2009
10/9/2009
10/10/2009
10/11/2009
10/12/2009
10/13/2009
10/14/2009
10/15/2009
10/16/2009
10/17/2009
10/18/2009
10/19/2009
10/20/2009
10/21/2009
10/22/2009
10/23/2009
10/24/2009
10/25/2009
10/26/2009
10/27/2009
10/28/2009
10/29/2009
10/30/2009
10/31/2009
11/1/2009
11/2/2009
11/3/2009
11/4/2009
11/5/2009
11/6/2009
11/7/2009
11/8/2009
11/9/2009
11/10/2009
11/11/2009
11/12/2009
11/13/2009
11/14/2009
11/15/2009
11/16/2009
11/17/2009
11/18/2009
11/19/2009
11/20/2009 0.57
11/21/2009
11/22/2009
11/23/2009
11/24/2009
11/25/2009 0.03
11/26/2009
11/27/2009 0.17
11/28/2009 0.37
11/29/2009
11/30/2009 0.57
12/1/2009
12/2/2009
12/3/2009
12/4/2009
12/5/2009
12/6/2009
12/7/2009
12/8/2009
12/9/2009
12/10/2009 M
12/11/2009
12/12/2009
12/13/2009
12/14/2009 0.17
12/15/2009
12/16/2009 **
12/17/2009 0.10 **
12/18/2009 0.00 **
12/19/2009 **
12/20/2009 **
12/21/2009 **
12/22/2009 **
12/23/2009 **
12/24/2009 0.14
12/25/2009
12/26/2009 **
12/27/2009 **
12/28/2009 0.90
12/29/2009 0.33
12/30/2009
12/31/2009
Day of YearDaily PrcpMultiday Prcp
1/1/2010
1/2/2010 **
1/3/2010 **
1/4/2010 **
1/5/2010 **
1/6/2010 **
1/7/2010 **
1/8/2010 0.64
1/9/2010
1/10/2010
1/11/2010
1/12/2010 0.01
1/13/2010 0.02
1/14/2010
1/15/2010
1/16/2010
1/17/2010
1/18/2010
1/19/2010
1/20/2010 0.06
1/21/2010
1/22/2010
1/23/2010
1/24/2010
1/25/2010 0.33
1/26/2010 0.81
1/27/2010
1/28/2010 0.02
1/29/2010
1/30/2010
1/31/2010
2/1/2010 0.01
2/2/2010 0.01
2/3/2010
2/4/2010 0.03
2/5/2010
2/6/2010 T
2/7/2010
2/8/2010
2/9/2010 0.05
2/10/2010
2/11/2010
2/12/2010
2/13/2010
2/14/2010
2/15/2010
2/16/2010 T
2/17/2010 0.05
2/18/2010 0.16
2/19/2010
2/20/2010
2/21/2010 0.16
2/22/2010
2/23/2010 0.15
2/24/2010 0.24
2/25/2010 0.08
2/26/2010 0.33
2/27/2010
2/28/2010
3/1/2010
3/2/2010
3/3/2010
3/4/2010
3/5/2010
3/6/2010
3/7/2010
3/8/2010
3/9/2010
3/10/2010
3/11/2010
3/12/2010
3/13/2010
3/14/2010
3/15/2010 0.39
3/16/2010
3/17/2010
3/18/2010
3/19/2010
3/20/2010
3/21/2010
3/22/2010
3/23/2010 **
3/24/2010 0.92
3/25/2010
3/26/2010
3/27/2010
3/28/2010
3/29/2010 0.31 **
3/30/2010 **
3/31/2010 0.29
Day of YearDaily PrcpMultiday Prcp
4/1/2010
4/2/2010 0.00
4/3/2010
4/4/2010
4/5/2010
4/6/2010
4/7/2010 0.31
4/8/2010 **
4/9/2010 **
4/10/2010 0.24
4/11/2010
4/12/2010 0.18
4/13/2010
4/14/2010
4/15/2010
4/16/2010 0.12
4/17/2010 0.24
4/18/2010
4/19/2010 0.02
4/20/2010
4/21/2010
4/22/2010
4/23/2010
4/24/2010
4/25/2010
4/26/2010 **
4/27/2010 **
4/28/2010 1.32
4/29/2010
4/30/2010
5/1/2010 **
5/2/2010 **
5/3/2010 0.10
5/4/2010
5/5/2010 **
5/6/2010 0.30
5/7/2010 **
5/8/2010 0.31
5/9/2010 **
5/10/2010 0.02
5/11/2010
5/12/2010
5/13/2010
5/14/2010 0.21
5/15/2010
5/16/2010
5/17/2010
5/18/2010
5/19/2010
5/20/2010
5/21/2010
5/22/2010 **
5/23/2010 **
5/24/2010 0.22
5/25/2010
5/26/2010
5/27/2010 0.32
5/28/2010
5/29/2010
5/30/2010
5/31/2010
6/1/2010 **
6/2/2010 **
6/3/2010 1.37
6/4/2010
6/5/2010 **
6/6/2010 **
6/7/2010 0.94
6/8/2010
6/9/2010
6/10/2010 0.09
6/11/2010
6/12/2010
6/13/2010 0.64
6/14/2010 **
6/15/2010 **
6/16/2010 **
6/17/2010 **
6/18/2010 0.52
6/19/2010
6/20/2010 **
6/21/2010 0.33
6/22/2010
6/23/2010 0.43
6/24/2010 0.38
6/25/2010
6/26/2010 **
6/27/2010 **
6/28/2010 **
6/29/2010 0.70
6/30/2010 **
Day of YearDaily PrcpMultiday Prcp
7/1/2010 0.27
7/2/2010
7/3/2010
7/4/2010
7/5/2010
7/6/2010
7/7/2010
7/8/2010
7/9/2010 **
7/10/2010 **
7/11/2010 **
7/12/2010 **
7/13/2010 1.49
7/14/2010
7/15/2010
7/16/2010
7/17/2010
7/18/2010
7/19/2010
7/20/2010
7/21/2010 **
7/22/2010 **
7/23/2010 **
7/24/2010 **
7/25/2010 **
7/26/2010 **
7/27/2010 2.11
7/28/2010
7/29/2010
7/30/2010
7/31/2010
8/1/2010
8/2/2010
8/3/2010 0.06
8/4/2010
8/5/2010 **
8/6/2010 **
8/7/2010 **
8/8/2010 **
8/9/2010 **
8/10/2010 1.27
8/11/2010
8/12/2010
8/13/2010
8/14/2010
8/15/2010
8/16/2010
8/17/2010
8/18/2010
8/19/2010
8/20/2010
8/21/2010 **
8/22/2010 **
8/23/2010 **
8/24/2010 **
8/25/2010 **
8/26/2010 **
8/27/2010 **
8/28/2010 **
8/29/2010 **
8/30/2010 4.97
8/31/2010
9/1/2010
9/2/2010
9/3/2010
9/4/2010
9/5/2010
9/6/2010
9/7/2010
9/8/2010
9/9/2010
9/10/2010
9/11/2010
9/12/2010
9/13/2010
9/14/2010
9/15/2010
9/16/2010
9/17/2010
9/18/2010
9/19/2010
9/20/2010
9/21/2010
9/22/2010 **
9/23/2010 **
9/24/2010 **
9/25/2010 **
9/26/2010 **
9/27/2010 **
9/28/2010 **
9/29/2010 **
9/30/2010 **



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
11/20/2009 8:00 PM 0.57 M M M M THERE WERE ALSO HIGH WINDS OBSERVED AT MY WEATHER STATION. THE HIGHEST RECORDED WIND GUSTS WAS FROM THE WEST AT 31MPH AT 5:37AM ON FRIDAY MORNING NOVEMBER 20TH AS WELL AS RAPID CHANGES IN THE BAROMETRIC PRESSURE.
11/25/2009 8:00 AM 0.03 M M M M THE RAINSHOWER ACTIVITY WAS LIGHT, SHOWERY AND IT WAS SCATTERED THROUGHOUT MOST OF THE ST LAWRENCE VALLEY. THERE ALSO WAS AREAS OF DENSE FOG ALSO IN MANY AREAS OF THE ST LAWRENCE VALLEY. IN THE ADIRONDACK MOUNTAINS THERE WERE ALSO REPORTS OF SLEET EARLY THIS MORNING.
11/27/2009 6:00 AM 0.17 T 0.17 M M RAIN WAS MIXED WITH SNOW AT TIMES FROM 8:45AM THRU 10:00AM. ALSO THE BAROMETRIC PRESSURE WAS FALLING RAPIDLY THROUGHOUT THE NIGHT AT A RATE OF 0.06HG PER HOUR. WE ARE EXPECTING WIND GUSTS THIS AFTERNOON & EVENING FROM THE WEST & NOTHWEST AT 20 TO 30MPH WITH POSSIBLE GUSTS TO 40MPH IN SOME AREAS. THE ADIRONDACK MOUNTAINS MAY SEE A TOTAL SNOWFALL OF 3.0" BY SATURDAY AS A DEEP NOR'EASTER STORM MOVES NORTH ALONG THE EASTERN SEABOARD. NEW YORK CITY & BOASTON MAY SEE WINDS GUSTS AS HIGH AS 60MPH. I DID NOT OBSERVE ANY SEVERE STREET FLOODING OUTSIDE OF NORMAL PONDING IN LOW AREAS.
11/28/2009 6:00 AM 0.37 M M M M THE BAROMETRIC PRESSURE WAS FALLING THEN STARTED RISING RAPIDLY AFTER THE NOR'EASTER MOVED OFF THE NEW ENGLAND COAST AND OUT INTO THE ATLANTIC. RAIN WAS INTERMITTANT THROUGHTOUT FRIDAY AFTERNOON AND EVENING. DENSE FOG ALSO DEVELOPED IN THE HIGHER ELEVATIONS JUST SOUTH OF POTSDAM APPROXIMATELY 5:00PM ON FRIDAY EVENING. ALSO THERE WAS MEARURABLE SNOW IN THE SMALL VILLAGE OF PARISHVILLE LOCATED 9 MIULES OUTH OF POTSDAM AT AN ELEVATION OF 900 FEET ABOVE SEA LEVEL. RIGHT NOW AT 1:30PM SATURDAY AFTERNOON WE HAVE PARTLY CLOUDY SKIES AND THE WINDS ARE WEST/ NORTHWEST AT 10 GUSTING TO 15 MPH.
11/30/2009 6:00 AM 0.57 0.5 0.08 0.5 0.05 AFTER I TOOK THE 6:00AM 24 HOUR PRECIPITATION THE RAIN MIXED WITH AND CHANGED TO WET SNOW AND THE SNOW CONTINUED UNTIL 12:00 NOON BEFORE TAPERING OFF TO CLOUDY SKIES
12/10/2009 6:00 AM M 3.5 0.30 3.0 M I RECORDED THE LOWEST BAROMETRIC PRESSURE FROM THIS STORM OF 29.07HG ON WEDNESDAY AFTERNOON AT 1:30PM The total of 1.67 inches reported was actually a storm total, not a daily total. kv 12.16.09
12/14/2009 6:00 AM 0.17 0.5 0.08 1.5 0.18 RAIN TAPERED OFF TO DRIZZLE DURING THE NIGHT MONDAY INTO TUESDAY. THERE WAS AREAS OF FOG, DRIZZLE & MIST THROUGH THE EARLY MORNING HOURS OF TUESDAY THEN RAIN MIXED WITH AND CHANGED OVER TO LIGHT SNOW GRAINS 9:00AM TUESDAY THEN SNOW SHOWERS THRU 1:00PM TUESDAY AFTERNOON
12/17/2009 6:00 AM 0.10 1.0 0.10 3.0 M THE SNOW WHICH OCCURED ON WEDNESDAY DECEMBER 16 WAS AHEAD OF A LEADING EDGE OF ARCTIC AIR WHICH MOVED INTO NORTHERN NEW YORK AS OF LATE WEDNESDAY AFTERNOON. THIS MORNING (THURSDAY DECEMBER 17TH)WE HAD A LOW OF -3F AND A VERY HIGH BAROMETRIC PRESSURE READING OF 30.49HG. THE WEATHER CONDITIONS SO FAR TODAY WERE MAINLY SUNNY SKIES WITH A FEW CUMULOUS CLOUDS.
12/18/2009 6:00 AM 0.00 0.0 0.00 3.0 0.25 A LARGE MASS OF ARCTIC AIR IS PARKED OVER NORTHERN NEW YORK. I OFFICIALLY RECORDED A MORNING LOW OF -4F BUT SEVERAL AREAS IN NORTHERN NEW YORK RECORDED LOWS AS LOW AS -22F (SARANAC LAKE,NY)
12/29/2009 6:00 AM 0.33 3.5 0.33 4.0 M THERE WAS ALSO CONSIDERSABLE BLOWING SNOW AS I RECORDED WIND GUSTS FROM THE WEST AT 20 MPH
1/12/2010 6:00 AM 0.01 0.1 0.01 M M
1/13/2010 6:00 AM 0.02 0.2 0.02 M M The amount of snow which fell during the 24 hour period ending at 6:00AM this morning was quite variable depending on where you were located. I only recorded a dusting or .2" whereas in nearby Parishville (Elevation: 900 Feet above sea level had considerably more due to the upslope affects..)
1/20/2010 6:00 AM 0.06 1.3 M M M
1/25/2010 6:00 AM 0.33 M M M M BESIDES MODERATE TO HEAVY RAIN, I RECORDED WIND GUSTS FROM THE SE @ 27 MPH .. LOWEST BAROMETRIC PRESSURE 29.08HG
1/26/2010 6:00 AM 0.81 M M 3.5 M THE STORM TOTAL RAINFALL FOR THE DAY MONDAY WAS 0.81" OF RAINFALL. THIS WAS A NEAR RECORD RAINFALL FOR JANUARY 25. THE RECORD RAINFALL FOR JANUARY 25 WAS 0.84" WHICH WAS ORIGINALLY SET BACK ON JANUARY 25 1997. THE HIGHEST WIND GUST AT MY WEATHER STATION IN POTSDAM WAS FROM THE WEST AT 27 MPH & AT RICHARD'S FIELD IN MASSENA A WIND GUST OF 33 FROM THE SOUTHWEST MPH WAS RECORDED ON MONDAY. HIGH TEMPERATURE ON MONDAY AT POTSDAM WAS 54F (NOT A RECORD AS THE HIGHEST TEMPERATURE AT POTSDAM WAS 64F SET BACK ON JANUARY 25 1967.)
1/28/2010 6:00 AM 0.02 3.2 M M M THE SNOW WE RECIEVED IN THE LAST 24-HOURS ENDING AT 6:00AM THIS MORNING WAS LAKE EFFECT SNOW COMOING OFF OF LAKE ONTARIO. THE WINDS AT 5000 FEET BACKED TO THE SW AHEAD OF AN ARCTIC FRONT. LAKE EFFECT SNOW IS USUALLY A DRY & FLUFFY SNOW SO THE WATER CONTENT IS QUITE LOW.
2/1/2010 6:00 AM 0.01 0.1 0.01 M M The preciptation which occured during the day on Sunday was the result of a fast moving Alberta Clipper low & trough which provided a respit from an Arctic outbreak which brought a Saturday Morning low of -13F. Monthly Average Temperature for January 2010 was 18.1F which was above normal & total monthly precipiation for January
2/2/2010 6:00 AM 0.01 0.1 0.01 M M
2/4/2010 6:00 AM 0.03 0.3 0.03 M M
2/6/2010 6:00 AM T T T 8.0 M A VERY LIGHT SNOWFLURRY OCCURED FRIDAY MORNING WITH THE PASSAGE OF A WEAK COLD FRONT.
2/9/2010 6:00 AM 0.05 0.6 M M M
2/16/2010 6:00 AM T T M M M
2/17/2010 6:00 AM 0.05 0.5 M M M
2/18/2010 6:00 AM 0.16 1.0 M M M
2/21/2010 6:00 AM 0.16 1.1 M M M
2/23/2010 6:00 AM 0.15 2.1 M 8.0 M
2/24/2010 6:00 AM 0.24 3.2 M M M
2/25/2010 6:00 AM 0.08 2.8 M M M
2/26/2010 6:00 AM 0.33 1.5 M M M i officially recorded a low sea level pressure of 29.15hg in the early morning ohurs plus a peak wind gust from the NORTHEAST @ 36MPH AT 4:23AM
3/15/2010 6:00 AM 0.39 M M M M
3/29/2010 6:00 AM 0.31 M M M M
4/2/2010 6:00 AM 0.00 0.0 M M M A NEW RECORD HIGH TEMPERATURE OF 83F WAS SET AT POTSDAM, NY BREAKING THE OLD RECORD HIGH FOR APRIL 2 OF 62F BACK ON APRIL 2 1988
4/7/2010 6:00 AM 0.31 M M M M BETWEEN 2200-2330 ON APRIL 6 A BRIEF THUNDERSTORM PASSED OVER POTSDAM WITH OCCASIONAL CLOUD TO GROUND LIGHTNING.
4/12/2010 6:00 AM 0.18 M M M M A BRIEF BUT HEAVY THUNDERSTORM PRODUCED PEA SIZED HAILSTONES AT MY HOME ADDRESS SUNDAY BETWEEN 1830-1915L. THERE WERE ONLY A FEW CLOUD TO GROUND LIGHTNING STRIKES.
4/16/2010 6:00 AM 0.12 M M M M
4/17/2010 6:00 AM 0.24 M M M M Friday April 16th rain was showery in the morning hours with a period of steady rain from midday thru afternoon
4/19/2010 6:00 AM 0.02 M M M M
5/14/2010 6:00 AM 0.21 M M M M
5/27/2010 6:00 AM 0.32 M M M M AFTER A DAY OF RECORD BREAKING HEAT HERE IN NORTHERN NEW YORK, A "BACKDOOR" COLD FRONT MOVING FROM NORTHEAST TO SOUTHWEST WEAKENED AND BECAME STATIONARY. A STRONG MID & UPPER LEVEL NORTHERLY WIND PARALLELING THE FRONT TOUCHED OFF A LARGE LINE OF STRONG & SEVERE THUNDERSTORMS FROM NORTHERN ONTARIO CANADA THRU VERMONT & NORTHERN NEW YORK. BETWEEN 10:00PM AND MIDNIGHT. STRONG THUNDERSTORMS MOVED SOUTH ACROSS THE ST LAWRENCE VALLEY RESULTING IN HEAVY RAINS & FREQUENT CLOUD TO GROUND LIGHTNING. WE HERE IN POTSDAM HAD A BRIEF POWER INTERRUPTION AT 10:45PM.
6/10/2010 6:00 AM 0.09 M M M M
6/13/2010 6:00 AM 0.64 M M M M
6/23/2010 6:00 AM 0.43 M M M M
6/24/2010 6:00 AM 0.38 M M M M
8/3/2010 6:00 AM 0.06 M M M M Here is the climatological summary for July 2010 for Potsdam, NY AVERAGE DAILY HIGH TEMPERATURE: 82.2F AVERAGE DAILY LOW TEMPERATURE: 64.1F MONTHLY AVERAGE TEMPERATURE: 73.1F + 4.4F ABOVE NORMAL TOTAL MONTHLY PRECIPITATION: 4.13" +0.58" ABOVE NORMAL THERE WAS AN 8-DAY HEATWAVE FROM JULY 5-12 WHERE THE DAILY HIGHS EXCEEDED THE NORMAL DAIL HIGHS BY AS MUCH AS 10F THE HIGHEST TEMPERATURE DURING THIS PERIOD WAS 93F ON JULY 6TH WITH A VERY WARM DAILY MEAN TEMPERATURE OF 84F ALSO ON THAT DATE. THERE WERE THREE THUNDERSTORM DAYS HERE IN POTSDAM DURING JULYDURING JULY.. TWO OF THESE WERE STRONG. THE FIRST STRONG STORM OCCURING ON JULY 9TH BROUGH 1.47" IN AN HOUR.. THE NEXT SEVERE STORM WAS A MAJOR OUTBREAK OF SEVERE WEATHER BRINGING 1.87" FOR A NEW DATE RECORD RAINFALL ALONG WITH MARBLE TO GOLFBALL SIZE HAIL IN SOME AREAS. A DOPPLER INDICATED TORNADO WAS INDICATED BY THE NWS PROMPTING A TORNADO WARNING FOR CENTRAL FRANKLIN COUNTY AND THERE WAS EYEWITNESSES ACCOUNTS OF NUMEROUS DOWNED TREES IN BRASHER FALLS BUT THIS WAS NOT CONFIRMED BY THE NWS WHETHER THIS WAS A TORNADO OR NOT.. TWO EF-2 TORNADOES WERE CONFIRMED IN CHATAUQUA COUNTY IN SOUTHWESTERN NEW YORK WHICH CAUSED DAMAGE IN THAT AREA ON JULY 24....



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes
12/16/2009 12/22/2009 6:00 AM 7 0.10 4.0 M
12/22/2009 12/24/2009 6:00 AM 3 0.14 3.5 3.00 THE SNOW WHICH FELL ALL DAY ON WEDNESDAY DECEMBER 23 WAS BACKLASH FROM THE DEEP LOW LOCATED WELL OUT IN THE GULF OF MAINE WHICH WAS THE HUGE STORM NAMED THE BLIZZARD OF 2009 WHICH BURIED THE NORTHEAST.
12/26/2009 12/28/2009 6:00 AM 3 0.90 0.5 M
1/2/2010 1/04/2010 6:00 AM 3 8.00 9.0 0.36 THE PRECIPTATION WHICH I'VE ENTERED IN HERE WAS THE COMBINED PRECITATION WHICH BEGAN SATURDAY MORNING AND CONTINUED RIGHT THROUGH 6:00AM THIS MORNING (MONDAY JANUARY 4 2010) THIS CONTINUOUS SNOWFALL IS THE RESULT OF A STALLED STORM SYSTEM OFF THE COAST OF NOVA SCOTIA AND AT TIMES HAS REGREESED WESTWARDS TOWARDS THE NEW ENGLAND COAST.
1/4/2010 1/08/2010 6:00 AM 5 0.64 M M
3/23/2010 3/24/2010 6:00 AM 2 0.92 0.5 M
3/29/2010 3/31/2010 6:00 AM 3 0.29 0.0 0.00
4/8/2010 4/10/2010 6:00 AM 3 0.24 M M A TRACE OF SNOW WAS OBSERVED HERE AT POTSDAM, NY AROUND 5:58AM SATURDAY MORNING APRIL 10.
4/26/2010 4/28/2010 6:00 AM 3 1.32 5.0 M THE RECORD 24-HOUR PRECIPITATION AND SNOWFALL FOR APRIL 27 2010 BROKE ALL RECORDS GOING BACK TO THE LATE 1920'S & EARLY 1930'S. THERE WAS WIDESPREAD AREAS OF POWER OUTAGES DUE TO THE HEAVY WEIGHT OF THE SNOW ON TREE BRANCHES AND POWER LINES DUE TO THE HIGH WATER CONTENT OF THIS SNOW. THERE WERE SEVERAL UNOFFICIAL REPORTS FROM THE HIGHER ELEVATIONS OF SOUTHERN ST LAWRENCE & FRANKIN COUNTIES OF TOTAL SNOWFALLS UP TO 14 INCHES.. ONE SCHOOL IN FRANKIN COUNTY CANCELED CLASSES DUE TO SNOW REMOVAL. THE STORM SYSTEM RESPONSIBLE FOR THIS UNUSUAL LATE SEASON SNOWFALL WAS ALSO RESPONSIBLE FOR THE MASSIVE TORNADO OUTBREAK ACROSS THE SOUTHERN UNITED STATES DURING THE PAST WEEKEND.. ALSO THE AMOUNT OF SNOWFALL DEPENDED ON WHERE YOU WERE LOCATED. THE HEAVIER SNOWFALL WAS LARGLEY A RESULT OF UPSLOPING AS NORTHEASTERLY WINDS CIRCULATING AROUND THE WEST OR BACKSIDE OF THE DEEP LOW BROUGH A COMBINATION OF ARCTIC AIR FROM NORTHERN CANADA & MARITIME AIR FROM THE NORTH ATLANTIC..
5/1/2010 5/03/2010 6:00 AM 3 0.10 M M SOME THUNDERSTORMS FORMED AHEAD OF A WARM FRONT ON SATURDAY AFTERNOON MAY 1...THE THUNDERSTORMS WERE FIRST DETECTED OVER SOUTHERN ONTARIO CANADA AND THREE HOURS LATER CAME ACROSS NORTHERN ST LAWRENCE COUNTY.. THEY WERE NON-SEVERE
5/5/2010 5/06/2010 6:00 AM 2 0.30 M M
5/7/2010 5/08/2010 6:00 AM 2 0.31 M M THE NEXT STORM SYSTEM FROM THE MIDWEST MOVED IN OVER NORTHERN NEW YORK SPREADING RAIN ACROSS THE ST LAWRENCE VALLEY SHORTLY AFTER 9:00PM FRIDAY NIGHT.. SHORTLY AFTER I EMPTIED THE RAIN GAUGE AT 6:00AM THIS MORNING, ANOTHER PERIOD OF HEAVY RAIN MOVED IN OVER THE ST LAWRENCE VALLEY.. WE ARE EXPECTING COLDER TEMPERATURES AND PEEIODS OF RAIN MIXING WITH WET SNOW WITH SOME ACCUMULATION OVER THE HIGHER ELEVATIONS ALONG WITH HIGH WINDS APPROACHING 50 MPH BY LATER ON SATURDAY AFTERNOON.
5/9/2010 5/10/2010 6:00 AM 2 0.02 0.1 M THERE WERE HIGHER AMOUNTS OF SNOW IN THE HIGHER ELEVATIONS OF THE ADIRONDACK MOUNTAINS. AT CRANBERRY LAKE ON SUNDAY 3.0 INCHES OF SNOW WAS RECORDED AND AT COLTON,NY 2.0 INCHES WAS RECORDED.
5/22/2010 5/24/2010 6:00 AM 3 0.22 M M
6/1/2010 6/03/2010 6:00 AM 3 1.37 M M
6/5/2010 6/07/2010 6:00 AM 3 0.94 M M THE MULTI DAY RAINFALL TOTAL WAS TAKEN AT MY WEATHER STATION AT POTSDAM, NY BUT WHAT I WANT TO REPORT TO YOU NOW WAS WHAT I OFFICIALLY OBSERVED IN NORTHERN ONEIDA COUNTY ON SUNDAY MORNING AT A SMALL LAKE. I SAW A SUDDEN SHIFT IN THE WINDS WITHIN A MOMENT. THIS WIND SHIFT WAS COMPLETELY FROM OPPOSITE DIRECTIONS. MY FIRST INDICATION WAS THAT THE LOW CENTER FROM THAT STORM SYSTEM WHICH SPAWNED THE DEADLY OUTBREAK OF TORNADOES IN ILLINOIS, MICHIGAN & NORTHWEST OHIO HAD PASSED DIRECTLY OVER THE LAKE AND WHAT I WAS EXPERIENCING WAS THE WIND CIRCULATION AROUND THE LOW. AFTER THIS SUDDEN AND TIGHT WIND SHIFT A HEAVY RAIN MOVED IN OVER NORTHERN ONEIDA COUNTY AND PERSISTED FOR AT LEAST TWO HOURS. THERE WAS NO DAMAGE FROM THIS SUDDEN WIND SHIFT BUT THE SUDDEN DEVELOPMENT AND RAPIDLY RISING CLOUDS BROUGHT THOUGHTS THAT THIS MAY HAVE BEEN A TORNADO TRYING TO DEVELOPE.. WHAT COMMONLY HAPPENS IN NORTHERN ONEIDA COUNTY IS UPSLOPE RAINFALL AND SUDDEN WINDSHIFTS DUE TO THE UPSLOPING OF WESTERN ADIRONDACKS AND THE CLOSE PROXIMITY TO THE BLACK RIVER VALLEY.. I DO NOT HAVE THE TOTAL AMOUNT OF RAINFALL FOR NORTHERN ONEIDA COUNTY... BUT I DID NOT OBSERVE ANY FLOODING.
6/14/2010 6/16/2010 6:00 AM 3 0.01 M M
6/16/2010 6/18/2010 6:00 AM 3 0.52 M M Depending on where you were located in the St Lawrence Valley.. the rainfall was varied..
6/20/2010 6/21/2010 6:00 AM 2 0.33 M M
6/26/2010 6/29/2010 6:00 AM 4 0.70 M M A SEVERE WEATHER OUTBREAK IN NORTHERN NEW YORK OCCURED DURING THE EVENING HOURS OF MONDAY JUNE 28...A LINE OF SEVERE THUNDERSTORMS FORMED IN SOUTHERN ONTARIO CANADA NORTHWEST OF THE VILLAGE OF MASSENA AND MOVED EAST AT 35 MPH.. RICHARD'S AIRPORT IN MASSENA RECOEDED A PEAK WIND GUST, MONDAY EVENING FROM THE WEST AT 41 MPH. TOTAL RAINFALL AT RICHARD'S FIELD ON MONDAY 1.32"...WHERAS TOTAL RAINFALL ON MONDAY AT MY WEATHER STATION HERE IN POTSDAM ON MONDAY WAS 0.49" ALSO THERE WAS A DOPPLER INDICATED TORNADO REPORTED IN CENTRAL OSWEGO COUNTY MONDAY EVENING.. I DO NOT HAVE ANY DETAILS ON ANY DAMAGE IN OSWEGO COUNTY.. NOR IN NORTHERN ST LAWRENCE COUNTY
6/30/2010 7/01/2010 6:00 AM 2 0.27 M M MONTHLY AVERAGE TEMPERATURE FOR JUNE 2010 @ POTSDAM,NY... 64.5F +1.4F ABOVE NORMAL TOTAL MONTHY PRECIPITATION FOR JUNE 2010.. 6.23 +2.90" ABOVE NORMAL
7/9/2010 7/13/2010 6:00 AM 5 1.49 M M ON FRIDAY JULY 9 A COLD FRONT MOVED EASTWARDS INTO A MASS OF VERY HOT & HUMID TROPICAL AIR TOUCHING OFF HEAVY THUNDERSTORMS ONE WHICH PRODUCED 1.47" OF RAIN IN A 3 HOUR PERIOD HERE IN POTSDAM, NY. THIS BROUGHT A TEMPORARY BREAK TO THE NEAR RECORD HEAT WE EXPERIECED HERE IN NORTHERN NEW YORK FROM JULY 5 - 9 WE PICKED UP ANOTHER 0.02 RAIN IN AN EARLY MORNING SHOWER THIS MORNING BETWEEN 4:30AM & 5:00AM
7/21/2010 7/27/2010 6:00 AM 7 2.11 M M NORTHERN NEW YORK GOT HIT BY AN OUTBREAK OF SEVERE WEATHER ON WEDNESDAY JULY 21.... ALONG WITH VERY HEAVY RAINFALL WHICH VARIED FROM .30" TO 3.00" THERE WERE REPORTS OF HAILSTONES RANGING IN SIZE FROM 1/2 INCH SIZE TO 11/2 SIZE HAIL.. THERE WAS A DOPPLER INDICATED TORNADO WHICH PROMPTED A TORNADO WARNING FOR CENTRAL FRANKLIN COUNTY....AND THERE WAS A REPORT OF VERY HIGH WINDS IN A SMALL AREA IN THE VICINITY OF BRUSHTON & BRASHER FALLS. KNOCKING OUT POWER FOR MANY CUSTOMERS IN THAT AREA.. 1.87 " OF RAIN FELL IN JUST AN HOUR HERE IN POTSDAM IN THAT ONE STORM.. ALONG WITH 1/2" DIAMETER HAIL
8/5/2010 8/10/2010 6:00 AM 6 1.27 M M
8/21/2010 8/30/2010 6:00 AM 10 4.97 M M THE REMNANTS OF TROPICAL DEPRESSION 5 WHICH CAME ASHORE NEAR THE MISSISSIPPI DELTA SLOWLY MOVED NORTH UP THE MISSISSIPPI VALLEY THEN INTO THE OHIO VALLEY WHERE IT EVENTUALLY MOVED IN OVER CENTRAL & NORTHERN NEW YORK STATE DURING THE TIME PERIOD FROM AUGUST 21-23 WHERE IT CAUSED CONSIDERABLE FLOODING OF MANY SMALL RIVERS & STREAMS FROM ONEIDA COUNTY THRU ST LAWRENCE COUNTY AS WELL AS MANY COUNTIES THRU OUT UPSTATE NEW YORK. THROUGHOUT ONEIDA, LEWIS JEFFERSON ST LAWRENCE COUNTIES AS WELL AS ALL OF NORTHERN NEW YORK. STREAMS FLOWING OFF THE TUG HILL PLATEAU WERE AT FULL CAPACITY FOR AT LEAST TWO DAYS FOLLOWING THE PASSAGE OF MOISTURE LADEN LOW PRESSURE SYSTEM....THERE WAS FLOODING OF ROUTE 345 BETWEEN POTSDAM & MADRID NEAR THE PIG ROAD INTERSECTION. SEVERAL PEOPLE REPORTED QUITE A BIT OF WATER IN THEIR BASEMENTS.. THE BLACK RIVER NEAR LOWVILLE WAS COMPLETELY OVER ITS BANKS NEAR NAUMBURG,NY FLOODING THE ENTIRE VALLEY IN THAT AREA. THERE WAS ALSO MINOR FIELD FLOODING AS WELL AS CONSIDERABLE PONDING IN MASSENA, MALONE AND POTSDAM.. IN THE NORTHERN ONEIDA COUNTY AREA OF LITTLE LONG LAKE. THE LAKE HAD RISEN AT LEAST 4.5 INCHES ABOVE ITS NORMAL POOL STAGE. SEVERAL DOCKS WERE COMPLETELELY SUBMERGED AS WELL AS A FEW SMALL BOATS WERE FILLED WITH WATER THAT THEY SANK TO THE BOTTOM OF THE LAKE....SEVERAL STREAMS IN ONEIDA COUNTY NEAR HERKIMER WERE COMPLETELY OVER THEIR BANKS.
9/22/2010 10/04/2010 6:00 AM 13 5.07 M M The total rainfall for the 9 day period fro September 22-30 was tropical moisture from the remnants of Tropical Depression Matthew and Tropical Storm Nicole.. When the "main event" occured with the 3.43" of rain in a 15-hour period from the remnants of TS Nicole, river, stream & urban flooding occured in many areas of Northern New York. In Lewis County near Lowville. several roads were closed due to at least 6 inches of water over Bealuk Road near Lowville as the Black River completely covered a large field in that area.Moving to Oswego County, in the village of Pulaski the swollen Salmon River threatened a building when the ground alongside the shores of the river began to give way. In St Lawrence County the Regis River was a raging torrent at Allens Falls near Parishville... In Potsdam, NY we had severe urban flooding in several backyards in one block of houses bordered by Beal Street, Waverly Street, Pleasant Street& parts of an adjacent neighborhood on Broad Street.. near the Potsdam business district. In this same neighborhod block many residents reported massive basement flooding when these people reported 3 to 5 feet of water in their cellars. It is not known whether they had flood insurance or not. Just south of Potsdam on Outer Main Street, the Parkhurst brook was way over its banks completely covering a cow pasture located about 1 mile south of the State University College @ Potsdam. classes at Potsdam State were unaffected by the rains and flooding.



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