A slow moving low pressure system moved from the eastern Great Lakes region across southern New York on the 22nd and 23rd, and interacted with very moist air across the portions of St. Lawrence and Franklin counties.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS BTV wrote it up.
A slow moving low pressure system moved from the eastern Great Lakes region across southern New York on the 22nd and 23rd, and interacted with very moist air across the portions of St. Lawrence and Franklin counties. Widespread moderate to heavy rainfall developed by midday on the 22nd, and continued through the afternoon and evening. Widespread rainfall of 2 to 4 inches with localized 4 to 7 inches of rainfall caused flooding the night of August 22nd into the morning of the 23rd.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Burlington, VT wrote its last area forecast discussion before the first event at Aug 22, 8:56 PM EST, 2 hours 4 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BURLINGTON VT 956 PM EDT SUN AUG 22 2010 .SYNOPSIS... .AN AREA OF LOW PRESSURE WILL SLOWLY MOVE ACROSS SOUTHERN NEW YORK OVERNIGHT. RAIN SPREADING NORTH OF THE LOW PRESSURE AREA ACROSS VERMONT AND NORTHERN NEW YORK WILL CONTINUE OVERNIGHT AND MONDAY MORNING...THEN BEGIN TO TAPER OFF LATE MONDAY AND MONDAY NIGHT. RAINFALL COULD BE HEAVY AT TIMES...ESPECIALLY IN THE EASTERN SLOPES OF THE ADIRONDACKS AND GREEN MOUNTAINS. THE WEATHER WILL REMAIN UNSETTLED THROUGH MIDWEEK...THEN TURN WARM AND DRY HEADING INTO THE WEEKEND. && .NEAR TERM /UNTIL 6 AM MONDAY MORNING/... AS OF 955 PM EDT SUNDAY...COMPOSITE RADAR LOOP SHOWING THE HEAVIEST RAINFALL ACROSS THE SAINT LAWRENCE VALLEY AND THE ADIRONDACKS IN NORTHERN NEW YORK AT THIS TIME. THIS IS IN GOOD AGREEMENT WITH THE 18Z GFS MODEL RUN WHICH SHOWS THE HEAVIEST RAINFALL OVERNIGHT WILL BE IN THESE AREAS. FURTHER EAST...VAD WIND PROFILES AND SURFACE WINDS SHOWING STRONG DOWNSLOPE FLOW OFF THE WESTERN SLOPES OF THE GREEN MOUNTAINS...WHICH HAS RESULTED IN LIGHTER RAINFALL AMOUNTS IN THESE AREAS. LATEST SURFACE DATA SHOWING A LOW PRESSURE AREA ALONG THE BORDER OF NEW YORK AND NORTHEAST PENNSYLVANIA BEGINNING TO FILL AS A SECONDARY LOW PRESSURE AREA DEVELOPS ALONG THE NEW JERSEY COAST OVERNIGHT. 18Z GFS MODEL RUN ALSO SHOWS THIS REDEVELOPMENT AND LOOKS GOOD. PREVIOUSLY ISSUED ZONE FORECAST STILL LOOKS GOOD...SO NO UPDATES WILL BE ISSUED. && .SHORT TERM /6 AM MONDAY MORNING THROUGH TUESDAY NIGHT/... AS OF 330 PM EDT SUNDAY...SURFACE LOW MOVES SLOWLY SOUTHEAST MONDAY...AND WITH FLOW AROUND LOW REPLENISHING MOISTURE AND GENERATING EASTERLY DEEP LAYER FLOW ACROSS NEW ENGLAND. ANOMOLOUSLY HIGH PWATS AND EASTERLY 850 MB WINDS CONTINUE THROUGH MONDAY...WITH BOTH RUNNING 2-3 STANDARD DEVIATIONS ABOVE NORMAL.THIS WILL CONTRIBUTE TO HEAVY RAINFALL IN EASTWARD FACING UPSLOPE AREAS OF EASTERN NEW YORK AND SOUTHERN VERMONT. BY LATE IN DAY MONDAY SURFACE LOW MOVES FAR ENOUGH SOUTH AND EAST FOR PRECIP TO BEGIN TO SHUT DOWN...BUT MODELS BEGIN TO DIVERGE ON TIMING. ECMWF/NAM SOLUTION KEEPS PRECIP IN THROUGH MONDAY...TAPERING OFF MONDAY NIGHT...WHILE GFS QUICKER TO END. TRIED TO TREND TOWARD NAM/ECMWF SOLUTIONS...WHICH HAVE HAD A BETTER HANDLE ON THIS SYSTEM THROUGH THE WEEKEND. CUTOFF UPPER LOW REMAINS NEAR DELMARVA THROUGH TUESDAY NIGHT...THEN BEGINS TO LIFT NORTHEAST. SURAFCE LOW MOVING NORTHEAST AHEAD OF THE UPPER LOW REMAINS NEAR THE FORECAST AREA. CAN'T QUITE GET RID OF PRECIP ENTIRELY IN THE SHORT TERM WITH LOW CHC POPS CONTINUING IN SOUTH VERMONT DUE TO PROXIMITY OF LOW. GENERALLY CLOUDY AND COOL...AND UNDERCUT GMOS TEMP GUIDANCE BY BLENDING WITH SREF TEMPS. && .LONG TERM /WEDNESDAY THROUGH SUNDAY/... AS OF 330 PM EDT SUNDAY...LATEST MODELS HAVE THE UPPER LEVEL LOW FROM THE PREVIOUS SYSTEM BECOME AN OPEN WAVE AND BEGIN TO MOVE OFF THE NE COAST THRU WED...HOWEVER UPPER LEVEL VORTICITY AND MID LEVEL MOSTURE WILL LINGER...RESULTING IN CHANCE POPS...MAINLY OVER SERN VT. IF ANYTHING...THIS WILL KEEP SOME CLOUDS AROUND FOR LONGER...LIMITING HIGH TEMPS TO SLIGHTLY BELOW NORMAL ACROSS SERN VT. THEREFORE HAVE ADJUSTED TEMPS DOWN SLIGHTLY FROM GUIDANCE. A WEAK SURFACE RIDGE MAY HELP TO LIMIT PRECIP OVER REMAINER OF CWA. MODELS ARE IN GOOD AGREEMENT IN HAVING ANOTHER WAVE AND 500MB VORT MAX DIG DOWN ACROSS THE REGION THURS AFTN...ALONG WITH ASSOC SURFACE COLD FRONT. THE WEAKENING TAIL END OF THIS FRONT PASSES ACROSS THE REGION QUICKLY THURS WITH LIMITED QPF...AND MAINLY OVER THE NORTHERN PORTIONS OF THE FORECAST AREA. TEMPS WILL DROP OFF POST FRONT UNDER NWLY FLOW...CAUSING FRIDAY TO BE SEVERAL DEGREES BELOW NORMAL...HOWEVER HIGH PRESSURE WILL QUICKLY BUILD IN FROM THE SW ALLOWING FOR MOSTLY SUNNY SKIES AND DRY CONDS FRIDAY THRU THE REMAINDER PRD. UNDER THESE CLEAR SKIES...OVERNIGHT LOWS WILL ALSO BE BELOW NORMAL BUT DAYTIME HIGHS WILL QUICKLY RECOVER WITH A WARMING TREND INTO THE WEEKEND AS THE HIGH PRESSURE SETTLES OVER THE AREA. && .AVIATION /02Z MONDAY THROUGH FRIDAY/... THROUGH 00Z TUESDAY...A LOW PRESSURE AREA ALONG THE NEW YORK NORTHEAST PENNSYLVANIA BORDER AT 00Z MONDAY WILL WEAKEN AND REDEVELOP ALONG THE NEW JERSEY COAST OVERNIGHT. CONDITIONS WILL VARY AROUND THE REGION OVERNIGHT FROM VFR TO MVFR TO IFR/LIFR. EAST TO SOUTHEAST DOWNSLOPE WINDS OFF THE GREEN MOUNTAINS WILL HELP TO KEEP CEILINGS IN THE VFR CATEGORY ACROSS WESTERN VERMONT AND THE CHAMPLAIN VALLEY. DURING THE DAY ON MONDAY...LATEST 18Z MODEL GUIDANCE SHOWING A RIDGE OF HIGH PRESSURE WILL BUILD SOUTHWEST FROM THE CANADIAN MARITIMES. THIS IN COMBINATION WITH SECONDARY LOW PRESSURE DEVELOPING OFF THE NEW JERSEY COAST OVERNIGHT WILL HELP TO SUPPRESS RAIN TO THE SOUTH DURING THE DAYLIGHT HOURS ON MONDAY. BUFKIT FORECAST SOUNDINGS SHOWING VFR CEILINGS ACROSS THE REGION DURING THE DAYLIGHT HOURS ON MONDAY. 00Z TUESDAY THROUGH FRIDAY...MVFR WITH LOCALIZED IFR CONDITIONS POSSIBLE MONDAY NIGHT WITH GRADUAL IMPROVEMENT. NARROW RIDGE AXIS SHOULD BRING PERIOD OF VFR CONDITIONS TUES/WED WITH PARTIAL CLEARING. COLD FRONT APPROACHING FROM THE WEST WILL BRING SCATTERED RAIN SHOWERS WEDNESDAY NIGHT INTO THURSDAY MORNING BEFORE CLEARING/VFR CONDITIONS RETURN FOR THE BALANCE OF THURSDAY. NW WINDS MAY GUSTY BEHIND THE FRONT ON THURSDAY /15-25 KTS/. && .HYDROLOGY... AS OF 330 PM EDT SUNDAY...HEAVIEST PRECIPITATION FALLING IN AREA THAT CAN HANDLE MORE RAINFALL THAN MOST IN OUR AREA...THE NORTHERN ADIRONDACKS. THIS AREA CAN ABSORB QUITE A BIT OF RAINFALL INTO LAKES AND BOGS...AND EXTENDED TIME PERIOD WORKING IN OUR FAVOR. HOWEVER AS RAIN AREA SHIFTS EAST...THREAT AREA WILL SHIFT TO EASTERN ESSEX COUNTY NY AS WELL AS EASTERN SLOPES OF SOUTHERN VERMONT WHERE STEEPER TERRAIN WILL RESPOND MORE QUICKLY TO HEAVY RAINFALL. OFFSETTING FACTOR IS ANTECEDENT CONDITIONS HAVE BEEN VERY DRY IN THESE AREAS LEADING UP TO THIS EVENT...AND MAINSTEM RIVER FLOODING NOT AS LIKELY WITH PLENTY OF STORAGE AVAILABLE IN MAIN RIVER CHANNELS. BIGGER THREAT FROM SMALLER CREEKS AND STREAMS EXCEEDING THEIR BANKS...AND POSSIBILITY OF DITCHES AND LOW LYING AREAS BECOMING INUNDATED. WILL CONTINUE FLOOD WATCH...AS TONIGHT INTO MONDAY MORNING IS TIMING OF GREATEST CONCERN. && .BTV WATCHES/WARNINGS/ADVISORIES... VT...FLOOD WATCH THROUGH MONDAY EVENING FOR VTZ009>012-018-019. NY...FLOOD WATCH THROUGH MONDAY EVENING FOR NYZ029>031-034-035. && SYNOPSIS...HANSON NEAR TERM...WGH SHORT TERM...HANSON LONG TERM...BANACOS AVIATION...WGH/SLW HYDROLOGY...HANSON
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BURLINGTON VT 414 AM EDT SUN AUG 22 2010 NYZ029>031-034-035-VTZ009>012-018-019-230815- SOUTHEASTERN ST. LAWRENCE-SOUTHERN FRANKLIN-WESTERN CLINTON- WESTERN ESSEX-EASTERN ESSEX-WESTERN ADDISON-ORANGE-WESTERN RUTLAND- WINDSOR-EASTERN ADDISON-EASTERN RUTLAND- 414 AM EDT SUN AUG 22 2010 ...FLOOD WATCH IN EFFECT FROM 4 PM EDT THIS AFTERNOON THROUGH MONDAY EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW YORK...CENTRAL VERMONT AND SOUTHERN VERMONT. .DAY ONE...TODAY AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. FLOOD WATCH. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. FLOOD WATCH. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. NYZ026>028-087-VTZ001>008-016-017-230815- NORTHERN ST. LAWRENCE-NORTHERN FRANKLIN-EASTERN CLINTON- SOUTHWESTERN ST. LAWRENCE-GRAND ISLE-WESTERN FRANKLIN-ORLEANS-ESSEX- WESTERN CHITTENDEN-LAMOILLE-CALEDONIA-WASHINGTON-EASTERN FRANKLIN- EASTERN CHITTENDEN- 414 AM EDT SUN AUG 22 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW YORK...CENTRAL VERMONT...NORTHEAST VERMONT AND NORTHWEST VERMONT. .DAY ONE...TODAY AND TONIGHT. PERIODS OF HEAVY RAIN ARE POSSIBLE THIS AFTERNOON AND DURING SUNDAY NIGHT. AT THIS TIME...IT APPEARS THE HEAVIEST RAIN WILL BE FOCUSED ACROSS THE NORTHERN ADIRONDACKS AND SOUTH-CENTRAL VERMONT...SO ADJACENT AREAS ARE NOT INCLUDED IN THE FLOOD WATCH. BASIN AVERAGED RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE EXPECTED ACROSS THE AREA BY MONDAY MORNING...AND MAY STILL YIELD SOME POOR DRAINAGE OR MINOR FIELD FLOODING ACROSS CENTRAL AND NORTHERN VERMONT AND THE ST. LAWRENCE VALLEY OF NEW YORK. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. BANACOS
The national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
Numerous roads were closed in Stockholm, Potsdam, Norwood, and Ogdensburg New York. The worst damage was on County Rte 47 in Stockholm, between State Routes 11 and 11B, where the road side and guard rail was washed away.
A reported seven inches of rain flooded roads and some buildings in and around St. Regis Falls NY. Local dirt roads sustained washouts and had to be repaired. In the hamlet of St. Regis Falls, a building housing the Waverly town office and a medical clinic was flooded by four to six inches of water, and water flooded St. Regis Falls Volunteer Fire and Rescue Department.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New York in 2010Every state in 2010This day in weather historyWarnings in New York, August 2010
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 253570, 253681.