A cold front in Ontario province approached the St. Lawrence River Valley during the afternoon of August 4th.
Every event with a place to put it. Tap one for its entry below.
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 cold front in Ontario province approached the St. Lawrence River Valley during the afternoon of August 4th. A thunderstorm complex in southeast Ontario approached the St. Lawrence River Valley during the mid to late afternoon hours and then quickly diminished as it entered St. Lawrence county. New York. However, a leading edge gust front did cross the St. Lawrence River and produced isolated wind damage in Ogdensburg.
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 4, 12:32 PM EST, 2 hours 43 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BURLINGTON VT 132 PM EDT WED AUG 4 2010 .SYNOPSIS... ANOTHER HAZY...HOT...AND HUMID DAY CAN BE EXPECTED ACROSS THE NORTH COUNTRY TODAY...ALONG WITH A CHANCE FOR SHOWERS AND THUNDERSTORMS. A COLD FRONT WILL PROVIDE SOME RELIEF TO THE HEAT AND HUMIDITY BY FRIDAY...ALONG WITH THE CHANCES FOR MORE SHOWERS AND THUNDERSTORMS. THE WEEKEND WILL FEATURE A MUCH COOLER AND DRIER AIRMASS...WITH HIGH TEMPERATURES MAINLY IN THE 70S AND LOWS IN THE 40S. && .NEAR TERM /UNTIL 2 AM THURSDAY MORNING/... AS OF 1138 AM EDT WEDNESDAY...HAVE GONE AHEAD AND CANCELLED THE FLASH FLOOD WATCH, BUT THAT DOES NOT MEAN THE CHANCE FOR ADDITIONAL FLOODING IS 0%. SEE THE HYDRO DISCUSSION DOWN BELOW FOR A LITTLE MORE THOUGHT ON THAT SUBJECT. CURRENTLY RATHER QUIET ACROSS THE FORECAST AREA WITH SMALL BUBBLY CU ACROSS THE REGION. TEMPERATURES ARE RISING THROUGH THE 70S AND INTO THE 80S. UNFORTUNATELY DEWPOINTS ARE ALSO UP THERE AS WELL, SO IT MAKES IT FEEL MORE UNCOMFORTABLE. 12Z SOUNDINGS AND AN ACARS SOUNDING OUT OF MONTREAL INDICATE THAT THE ATMOSPHERE IS A LITTLE MORE STABLE THAN IT WAS YESTERDAY WITH AN INVERSION UP AROUND 800MB. TEMPERATURES ALOFT HAVE WARMED SOME AS WELL. MODEL GUIDANCE ALSO SHOWS A WEAK SHORTWAVE RIDGE MOVING OVER THE REGION TODAY. THIS INDICATES THAT COVERAGE OF CONVECTION TODAY WILL BE LESS THAN YESTERDAY, BUT IT ALSO MEANS THAT THE CAP WILL KEEP THINGS FROM DEVELOPING UNTIL LATE AFTERNOON AND EVENING. HAVE CUT BACK POPS TO THE 20-30% RANGE, AND TRIED TO HIGHLIGHT THE HIGHER TERRAIN AS THE "BEST" CHANCE AS THERE DOES NOT APPEAR TO BE ANY OTHER SIGNIFICANT FORCING MECHANISM ABOUT. WITH THE SUN, TEMPERATURES SHOULD TOP OUT CLOSE TO THE 90F MARK IN THE VALLEYS, 80S ELSEWHERE. CONTINUES TO BE UNCERTAINTY FOR THE OVERNIGHT HOURS. LOCAL WRF AND HRRR MODELS DID A REASONABLY GOOD JOB YESTERDAY IN DEPICTING THE EVOLUTION AND TARGET AREA OF CONVECTION. LOOKING AT THEM TODAY, IT SEEMS AS THOUGH WE'LL HAVE SOME STORMS FIRE UP LATE AFTERNOON IN ONTARIO AND DRIFT EAST DURING THE EARLY-MID EVENING. HOWEVER, IT APPEARS AS THOUGH THE BULK OF THE STORMS WILL STAY NORTH OF THE BORDER. PERHAPS A FEW SNEAKING INTO THE ST LAWRENCE VALLEY TOO? THEY WILL BE SLOW MOVERS, SO LOCALLY HEAVY RAIN WOULD BE LIKELY WITH THOSE STORMS. HOPEFULLY THEY STAY NORTH OF OUR AREA. WILL REVISIT THIS FORECAST PROBLEM THIS AFTERNOON AFTER VIEWING ALL 12Z GUIDANCE. && .SHORT TERM /2 AM THURSDAY MORNING THROUGH FRIDAY/... AS OF 400 AM EDT WEDNESDAY...MID/UPPER LVL TROF DIGS ACRS THE NORTHERN GREAT LAKES AS SFC COLD FRNT APPROACHES OUR FA BY THURS. MODELS SHOW SYSTEM COMING IN SEVERAL PIECES...WITH FIRST 5H VORT AND WEAK PRE-FRONTAL TROF MOVING ACRS OUR CWA AROUND 18Z THURS...THEN NEXT POTENT 5H VORT AND ASSOCIATED COLD FRNT APPROACHES OUR WESTERN CWA BY 00Z FRIDAY...WITH FINAL 5H VORT AND SECONDARY COLD FRONT MOVING ACRS THE REGION BY 18Z FRIDAY. STILL SOME QUESTIONS WITH REGARDS TO AMOUNT OF INSTABILITY...BUT DEEP LAYER SHEAR WL BE INCREASING AS TROF APPROACHES WITH ASSOCIATED JET ENERGY. WL MENTION CHC POPS ATTM AND NOT MENTION ENHANCED WORDING. OTHERWISE...TEMPS WL BE IN THE 80S THURS AND FALL INTO THE 70S FOR HIGHS ON FRIDAY...WITH MUCH LESS HUMIDITY. GIVEN...THE VERY WARM AND MOIST AIR MASS IN PLACE...IT WL TAKE SOME TIME TO SUPPRESS THIS AIRMASS TO OUR SOUTH. && .LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/... AS OF 335 PM EDT TUESDAY...FORECAST FOR THE WEEKEND LOOKS ABSOLUTELY WONDERFUL WITH A WELCOMED BREAK FROM WET AND HUMID CONDITIONS THIS WEEK. AS HIGH PRESSURE SETTLES OVER THE REGION BEHIND A COLD FRONT PASSAGE...THE NORTH COUNTRY WILL EXPERIENCE SUNNY SKIES AND TEMPERATURES NEAR OR SLIGHTLY BELOW NORMAL FOR SATURDAY AND SUNDAY. FORECAST BECOMES A BIT MORE UNCERTAIN FROM SUNDAY NIGHT ONWARDS IN REGARDS TO THE SOUTHERN EXTENT OF TROUGHING OVER THE REGION. 03/12Z ECMWF AND 04/00Z GFS IN FAIRLY GOOD AGREEMENT SHOWING THE BOUNDARY SLIPPING SOUTH ENOUGH TO WARRANT CHANCE POPS FOR THE REGION FROM SUNDAY NIGHT THROUGH TUESDAY. OVERALL TEMPERATURES SHOULD BE NEAR SEASON NORMS DURING THIS PERIODS BUT OVERNIGHT LOWS WILL REMAIN ON THE WARM SIDE AS FLOW TURNS SOUTH/SOUTHWESTERLY AND SURFACE DEWPOINTS SLOWLY CLIMB. && .AVIATION /18Z WEDNESDAY THROUGH MONDAY/... THROUGH 18Z THURSDAY...MAINLY VFR CONDS EXPECTED THROUGH 03Z THU UNDER OCCNLY GUSTY SOUTH/SOUTHWESTERLY FLOW. STILL A CONDITIONAL THREAT OF THUNDER BY LATE THIS AFTERNOON AND INTO THE EVENING HOURS...ESP NORTH. ANY TERMINAL THAT DOES EXPERIENCE THUNDER WOULD EXPECT BRIEF HVY RAFL AND ASSOC IFR/MVFR CONDS FOR A SHORT PERIOD. BY TONIGHT ANY EVENING CONVECTIVE ACTIVITY SHOULD WANE...LEAVING SCT/BKN LOW TO MID LVL CLOUDS AND PATCHY BR AT MANY SITES GIVEN ANOMALOUSLY DEEP LL MOISTURE IN PLACE AND LIGHT WINDS. THEREAFTER...VFR CONDS EXPECTED FROM 12Z THU ONWARD AS FLOW REMAINS SOUTH/SOUTHWESTERLY AND OCCNLY GUSTY INTO THE EARLY AFTERNOON HOURS. OUTLOOK 18Z THURSDAY THROUGH MONDAY... 18Z THU THRU 18Z FRI...CHANCE MVFR/IFR TSRA AS COLD FRONT PUSHES THROUGH. 18Z FRI THRU 12Z MON...GENERALLY VFR UNDER HIGH PRESSURE. LATE NIGHT/EARLY MORNING FOG PROBABLE AT KMPV/KSLK. 12Z MONDAY ONWARD...MAINLY VFR THOUGH WITH CHC OF SHOWERS/THUNDER AS ADDL ENERGY SAGS SOUTH INTO THE REGION. && .HYDROLOGY... AS OF 1145 AM WEDNESDAY...AFTER TWO ROUND OF HEAVY RAINS OVER THE PAST 48 HOURS ACROSS NORTHERN NEW YORK AND VERMONT (PRODUCING RAINFALL TOTALS OF 3 TO 6+ INCHES), THAT REGION IS SATURATED. ALTHOUGH WE HAVE TAKEN DOWN THE FLASH FLOOD WATCH AS WE EXPECT COVERAGE OF THUNDERSTORMS TODAY AND THIS EVENING TO BE QUITE LIMITED, THERE STILL IS A CONDITIONAL THREAT FOR FLOODING. IF WE DO GET ANY THUNDERSTORMS TO DEVELOP, EVEN THOUGH THEY MAY NOT AFFECT A LARGE AREA, THEY COULD QUICKLY DUMP SIGNIFICANT RAINFALL IN A SMALL AREA. DUE TO THE SATURATED CONDITIONS, FLASH FLOOD GUIDANCE INDICATES THAT JUST 3/4" OF RAIN IN LESS THAN AN HOUR OR 1 INCH IN LESS THAN 3 HOURS WILL LEAD TO PROBLEMS. WE WILL CONTINUE TO CLOSELY MONITOR THAT SITUATION. OTHERWISE, WE ARE EXPECTING THE RIVER LEVELS TO BEGIN TO FALL AS THE HEAVY RAINS WORK THEIR WAY THROUGH THE SYSTEM. && .BTV WATCHES/WARNINGS/ADVISORIES... VT...NONE. NY...NONE. && SYNOPSIS...TABER NEAR TERM...NASH SHORT TERM...TABER LONG TERM...LAHIFF AVIATION...JMG/LAHIFF HYDROLOGY...NASH
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BURLINGTON VT 429 AM EDT WED AUG 4 2010 NYZ026-027-029-030-034-035-087-VTZ001-008>012-018-019-050830- NORTHERN ST. LAWRENCE-NORTHERN FRANKLIN-SOUTHEASTERN ST. LAWRENCE- SOUTHERN FRANKLIN-WESTERN ESSEX-EASTERN ESSEX- SOUTHWESTERN ST. LAWRENCE-GRAND ISLE-WASHINGTON-WESTERN ADDISON- ORANGE-WESTERN RUTLAND-WINDSOR-EASTERN ADDISON-EASTERN RUTLAND- 429 AM EDT WED AUG 4 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW YORK...CENTRAL VERMONT...NORTHWEST VERMONT AND SOUTHERN VERMONT. .DAY ONE...TODAY AND TONIGHT. ISOLATED TO SCATTERED THUNDERSTORMS WILL AGAIN REDEVELOP ACROSS NORTHERN NEW YORK AND PARTS OF VERMONT THIS AFTERNOON AND EVENING. THE PRIMARY THREAT WILL BE LOCALIZED VERY HEAVY RAINFALL IN A SHORT PERIOD OF TIME AND BRIEF WIND GUSTS TO 35 MPH. THE POTENTIAL FOR LOCALIZED FLOODING WILL BE POSSIBLE, AS RAINFALL AMOUNTS OF 1 TO 2 INCHES MAY OCCUR IN A SHORT TIME. THIS WILL CAUSE SHARP RISES ON STREAMS, ALONG WITH MINOR FLOODING OF POOR DRAINAGE AND LOW LYING AREAS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. ADDITIONAL SHOWERS AND THUNDERSTORMS ARE EXPECTED THURSDAY. GUSTY WINDS, LOCALLY HEAVY RAINFALL AND LIGHTNING STRIKES WILL CONTINUE TO BE THE PRIMARY THREATS. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT ANY FLOODING OR RAINFALL AMOUNTS TO THE NATIONAL WEATHER SERVICE IN BURLINGTON VERMONT. NYZ028-031-VTZ002>007-016-017-050830- EASTERN CLINTON-WESTERN CLINTON-WESTERN FRANKLIN-ORLEANS-ESSEX- WESTERN CHITTENDEN-LAMOILLE-CALEDONIA-EASTERN FRANKLIN- EASTERN CHITTENDEN- 429 AM EDT WED AUG 4 2010 ...FLASH FLOOD WATCH IN EFFECT UNTIL NOON EDT TODAY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW YORK...NORTHEAST VERMONT AND NORTHWEST 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. FLASH FLOOD WATCH. A BAND OF MODERATE TO HEAVY RAINFALL WILL CONTINUE ACROSS NORTHERN NEW YORK INTO NORTHERN VERMONT THIS MORNING...WHICH WILL CONTINUE TO CAUSE SHARP RISES ON LOCAL STREAMS AND RIVERS. IN ADDITION...FLOODING OF ROADWAYS AND FIELDS WILL BE POSSIBLE DUE TO THE HEAVY RAINFALL THIS MORNING. ISOLATED TO SCATTERED THUNDERSTORMS WILL ONCE REDEVELOP ACROSS NORTHERN NEW YORK AND VERMONT THIS AFTERNOON AND EVENING. THE GREATEST CONCENTRATION OF STORMS WILL BE ACROSS THE HIGHER TERRAIN. ADDITIONAL RAINFALL IN THESE AREAS COULD QUICKLY RESULT IN FLASH FLOODING, THUS A FLASH FLOOD WATCH IS IN EFFECT. GUSTY WINDS MAY ALSO OCCUR WITH THE STRONGEST STORMS. THUNDERSTORMS ARE EXPECTED TO DIMINISH LATE THIS EVENING. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. ADDITIONAL SHOWERS AND THUNDERSTORMS ARE EXPECTED THURSDAY. GUSTY WINDS, LOCALLY HEAVY RAINFALL AND LIGHTNING STRIKES WILL CONTINUE TO BE THE PRIMARY THREATS. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT ANY FLOODING OR RAINFALL AMOUNTS TO THE NATIONAL WEATHER SERVICE IN BURLINGTON VERMONT.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BURLINGTON VT
359 PM EDT WED AUG 4 2010
NYZ026-029-087-042100-
NORTHERN ST. LAWRENCE NY-SOUTHEASTERN ST. LAWRENCE NY-
SOUTHWESTERN ST. LAWRENCE NY-
359 PM EDT WED AUG 4 2010
...A STRONG THUNDERSTORM WILL AFFECT ST. LAWRENCE COUNTY...
AT 355 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 11 MILES WEST OF
LISBON...MOVING SOUTHEAST AT 30 MPH.
WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS STORM...ALONG WITH
BRIEF HEAVY DOWNPOURS AND CLOUD TO GROUND LIGHTNING.
THIS STORM WILL BE NEAR HEUVELTON AROUND 415 PM...RENSSELAER FALLS
AROUND 430 PM AND WEST PIERREPONT AROUND 445 PM.
LAT...LON 4463 7561 4463 7560 4471 7550 4478 7536
4467 7483 4432 7512 4459 7567
BANACOSSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BURLINGTON VT
406 PM EDT WED AUG 4 2010
VTZ002-016-042100-
EASTERN FRANKLIN VT-WESTERN FRANKLIN VT-
406 PM EDT WED AUG 4 2010
...A STRONG THUNDERSTORM WILL AFFECT FRANKLIN COUNTY...
AT 355 PM EDT...A STRONG THUNDERSTORM WAS LOCATED NEAR ALBURGH DUNES
STATE PARK...MOVING EAST AT 20 MPH.
WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS STORM...ALONG WITH
BRIEF HEAVY RAINFALL AND CLOUD TO GROUND LIGHTNING.
THIS STORM WILL BE NEAR SWANTON JUNCTION AROUND 415 PM...SHELDON
SPRINGS AROUND 430 PM...LAKE CARMI STATE PARK AROUND 445 PM AND
BERKSHIRE AROUND 500 PM.
IF THREATENING WEATHER MOVES INTO YOUR AREA...SEEK SHELTER INDOORS
AND REMAIN AWAY FROM WINDOWS.
LAT...LON 4481 7269 4476 7322 4480 7322 4482 7320
4489 7320 4494 7324 4497 7322 4501 7319
4503 7283 4502 7274
BANACOSThe Ft Drum radar (KTYX), 105 km away, was scanning. The volume nearest the first event began at 20:13 UTC.
1 thunderstorm wind. Local standard time, as filed.
Multiple full grown maple trees uprooted with damage to vehicles and some small structures on Elizabeth, Hamilton, Caroline, Franklin, State, Morris and Washington streets.
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: 242124.