A weak cold front and upper level disturbance moved through a marginally unstable air mass that ignited scattered thunderstorms during the afternoon hours of August 5th in New york. One or two of these produced isolated wind damage in portions of St.
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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 weak cold front and upper level disturbance moved through a marginally unstable air mass that ignited scattered thunderstorms during the afternoon hours of August 5th in New york. One or two of these produced isolated wind damage in portions of St. Lawrence and Franklin counties.
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 5, 3:07 PM EST, 59 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BURLINGTON VT 407 PM EDT SUN AUG 5 2012 .SYNOPSIS... SHOWERS AND THUNDERSTORMS...SOME STRONG...WILL MOVE THROUGH THE REGION THIS EVENING. BY MONDAY MORNING A COLD FRONT WILL SWEEP INTO THE REGION...ENDING THE RAIN THREAT AND RETURN TEMPERATURES TO NEAR NORMAL. FAIR WEATHER WILL FOLLOW THROUGH MID WEEK. && .NEAR TERM /UNTIL 8 AM MONDAY MORNING/... AS OF 400 PM EDT SUNDAY...CONVECTIVE THREAT HAS HAD A LOT TO WORK AGAINST TODAY...AS EXTENSIVE CLOUD COVER AND SCATTERED SHOWERS THIS MORNING HAS USED UP THE AVAILABLE CAPE. A MESOSCALE CLUSTER OF THUNDERSTORMS MOVED OUT OF PENNSYLVANIA THROUGH MIDDAY...AND HAS TRACKED ALONG SOUTHERN LAKE ONTARIO. CLOUDS HAVE CLEARED SOMEWHAT IN NORTHERN NEW YORK ALLOWING SURFACE TEMPERATURES TO CLIMB INTO THE UPPER 80S. THIS IS STARTING TO DESTABILIZE THE ATMOSPHERE...WITH SURFACE BASED CAPES APPROACHING 3000 J/KG. IN ADDITION...WITH APPROACHING COLD FRONT 0-6KM BULK SHEAR GETTING UP TO 40 TO 50 KTS. UPPER JET DYNAMICS BECOMING MORE FAVORABLE THROUGH THE EVENING AS NORTHERN NEW YORK FALLS UNDER RIGHT ENTRANCE REGION OF 500-250 MB JET. SAINT LAWRENCE COUNTY APPEARS TO BE UNDER GREATEST SEVERE THREAT AS STORM CLUSTER CONTINUES TO LIFT NORTHEAST. SECONDARY ROUND OF STORMS EXPECTED ORIENTED MORE WITH COLD FRONT TRAILING THE MESO SYSTEM THIS EVENING...AND MOVE WEST TO EAST LATE AFTERNOON AND EVENING. LESS OF A SEVERE THREAT WITH THESE STORMS...ALTHOUGH HEAVY RAINFALL AND ISOLATED STRONG WINDS POSSIBLE. TEMPERATURES IN NORTHERN NEW YORK WILL FEEL AFFECTS OF COLD FRONT BY MORNING AS LOW AND MID LEVEL DRYING TAKES PLACE ALONG WITH SOME COLD AIR ADVECTION. TEMPS MAINLY IN 50S IN NORTHERN NEW YORK...ALTHOUGH CAN'T RULE OUT SOME 40S IN HIGHER TERRAIN AND COOL SPOTS. 60S IN VERMONT. HEAVY RAIN THREAT ADDRESSED IN HYDRO SECTION BELOW. && .SHORT TERM /8 AM MONDAY MORNING THROUGH TUESDAY NIGHT/... AS OF 400 PM EDT SUNDAY...SURFACE HIGH PRESSURE BUILDING INTO REGION DURING THIS SHORT TERM PERIOD...WHILE BROAD UPPER TROUGH SETTLES INTO THE EASTERN GREAT LAKES. COMBINATION OF LOW HEIGHTS AND HIGH AT SURFACE WILL ALLOW FOR BIG DIURNAL TEMP SWINGS WITH COOL NIGHTTIME LOWS AND SUNNY DAYS. && .LONG TERM /WEDNESDAY THROUGH SUNDAY/... AS OF 431 AM EDT SUNDAY...A WEAK RIDGE OF HIGH PRESSURE WILL BE OVER THE REGION EARLY WEDNESDAY...WITH FAIR AND DRY WEATHER EXPECTED. ECMWF AND GFS MODELS CONTINUE TO HINT AT SOME SCATTERED CONVECTION TO DEVELOP ALONG AND NEAR THE INTERNATIONAL BORDER WEDNESDAY AFTERNOON. HAVE GONE WITH SLIGHT CHANCE POPS FOR SHOWERS AND THUNDERSTORMS WEDNESDAY AFTERNOON IN THE VICINITY OF THE INTERNATIONAL BORDER. THE REMAINDER OF THE FORECAST WILL REMAIN DRY ON WEDNESDAY. EXPECTING DRY WEATHER WEDNESDAY NIGHT...AS ANY CONVECTION THAT DOES DEVELOP WEDNESDAY AFTERNOON WILL LIKELY DISSIPATE WITH THE LOSS OF DAYTIME SURFACE HEATING. ECMWF AND GFS HINTING AT SOME SCATTERED CONVECTION THURSDAY AFTERNOON...SO HAVE GONE WITH LOW CHANCE POPS FOR SHOWERS AND THUNDERSTORMS. THE WEATHER WILL BECOME UNSETTLED TOWARD THE END OF THE WEEK...WITH THE GFS AND ECMWF MODELS SHOWING AN UPPER TROUGH AND A CLOSED UPPER LOW OVER THE WESTERN GREAT LAKES SLOWLY SWINGING EASTWARD...BRINGING A CHANCE OF SHOWERS AND THUNDERSTORMS TO THE REGION FRIDAY AND SATURDAY. COOLER AIR ALOFT WILL WORK INTO THE REGION ON SUNDAY. HOWEVER...THIS WILL SET THE STAGE FOR MORE RAIN SHOWERS ON SUNDAY. && .AVIATION /20Z SUNDAY THROUGH FRIDAY/... THROUGH 18Z MONDAY...GENEREALLY VFR EXCEPT SCT IFR VIS IN THUNDERSTORMS. STRONG GUSTY SOUTH WINDS THROUGH 00Z...THEN WIND DIMINISHES AND SHIFTS WEST TOWARD 06Z. BY MORNING WINDS AROUND TO NORTHWEST. PATCHY FOG POSSIBLE IN VALLEY LOCATIONS...HOWEVER LEFT OUT OF INDIVIDUAL TAFS AS RAIN OCCURRENCE AT TAF SITES WILL DETERMINE FOG POTENTIAL. OUTLOOK 12Z MONDAY THROUGH THURSDAY... MAINLY VFR CONDITIONS OVER THE ENTIRE AREA MONDAY AND CONTINUING RIGHT THROUGH THURSDAY...WITH SOME AREAS OF MVFR/IFR POSSIBLE IN SCATTERED SHOWERS AND THUNDRSTORMS THURSDAY AFTERNOON. && .HYDROLOGY... MOIST AIRMASS AHEAD OF THE COLD FRONT WITH PRECIPITABLE WATERS APPROACHING 2 INCHES AND 200 PERCENT NORMAL. TALL SKINNY CAPE AND WARM COALESCENS DEPTHS IN EXCESS OF 3KM WILL ENHANCE RAIN EFFICIENCY. STORMS HAVE PRODUCED BIG RAIN AMOUNTS IN SHORT AMOUNTS OF TIME...ROCHESTER NY RECEIVED 1.26 IN ABOUT 40 MINUTES EARLIER THIS AFTERNOON. HOWEVER FORWARD MOTION OF STORMS WILL LIMIT RAINFALL OVER ANY ONE AREA...REDUCING FLOOD THREAT. WILL STILL NEED TO MAINTAIN AWARENESS FOR STORMS REPEATEDLY MOVING OVER SAME AREA. && .MARINE... A LAKE WIND ADVISORY IS IN EFFECT TODAY AND TONIGHT... WINDS AT 10 TO 20 KTS THIS MORNING WILL CONTINUE TO INCREASE...AND BECOME STRONG AND GUSTY DURING THE AFTERNOON. WIND SPEEDS OF 25 TO 35 KNOTS WITH HIGHER GUSTS WILL BUILD WAVES TO 2 TO 5 FEET THIS AFTERNOON. THESE STRONG WINDS WILL CONTINUE INTO THIS EVENING...THROUGH AROUND MIDNIGHT. AFTER MIDNIGHT...WINDS WILL BECOME 10 TO 20 KTS...WITH WAVES DECREASING TO 1 TO 3 FEET. THERE IS ALSO A LAKE THUNDERSTORM ADVISORY IN EFFECT THIS AFTERNOON THROUGH TONIGHT... AS A COLD FRONT APPROACHES FROM THE GREAT LAKES REGION...SHOWERS AND THUNDERSTORMS AHEAD OF IT WILL MOVE EASTWARD ACROSS THE NORTH COUNTRY. SOME OF THESE STORMS WILL BECOME STRONG TO SEVERE WITH GUSTY WINDS AND HAIL. STORMS WILL MOVE INTO THE CHAMPLAIN VALLEY EARLY THIS AFTERNOON. HEAVY RAINFALL WILL ALSO ACCOMPANY THESE STORMS...POSSIBLY REDUCING VISIBILITIES TO LESS THAN 3 MILES. && .BTV WATCHES/WARNINGS/ADVISORIES... VT...NONE. NY...NONE. && SYNOPSIS...HANSON NEAR TERM...HANSON SHORT TERM...HANSON LONG TERM...WGH AVIATION...HANSON HYDROLOGY...HANSON MARINE...BTV
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BURLINGTON VT 408 PM EDT SUN AUG 5 2012 NYZ026>031-034-035-087-VTZ001>012-016>019-062015- NORTHERN ST. LAWRENCE-NORTHERN FRANKLIN-EASTERN CLINTON- SOUTHEASTERN ST. LAWRENCE-SOUTHERN FRANKLIN-WESTERN CLINTON- WESTERN ESSEX-EASTERN ESSEX-SOUTHWESTERN ST. LAWRENCE-GRAND ISLE- WESTERN FRANKLIN-ORLEANS-ESSEX-WESTERN CHITTENDEN-LAMOILLE-CALEDONIA- WASHINGTON-WESTERN ADDISON-ORANGE-WESTERN RUTLAND-WINDSOR- EASTERN FRANKLIN-EASTERN CHITTENDEN-EASTERN ADDISON-EASTERN RUTLAND- 408 PM EDT SUN AUG 5 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW YORK...CENTRAL VERMONT...NORTHEAST VERMONT...NORTHWEST VERMONT AND SOUTHERN VERMONT. .DAY ONE...TONIGHT. THE THREAT OF STRONG TO SEVERE THUNDERSTORMS WILL EXIST ACROSS NORTHERN NEW YORK THROUGH ABOUT 800 PM TONIGHT AND BETWEEN 600 PM AND MIDNIGHT ACROSS VERMONT. NORTHERN NEW YORK WILL HAVE THE GREATEST POTENTIAL FOR THE STRONG TO SEVERE STORMS WITH STRONG WINDS...HAIL...HEAVY RAIN...AND FREQUENT LIGHTNING EXPECTED. WHILE THE THREAT FOR STRONG TO SEVERE STORMS IS NOT AS GREAT ACROSS VERMONT...ANY STORMS WILL STILL HAVE THE POTENTIAL FOR STRONG WIND GUSTS...HAIL...HEAVY RAIN...AND FREQUENT LIGHTNING. SEEK SHELTER AS STORMS APPROACH! .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BURLINGTON VT
220 PM EDT SUN AUG 5 2012
VTZ011-012-019-051915-
EASTERN RUTLAND VT-WESTERN RUTLAND VT-WINDSOR VT-
220 PM EDT SUN AUG 5 2012
...A LINE OF THUNDERSTORMS WILL MOVE THROUGH SOUTHERN RUTLAND
AND SOUTHWESTERN WINDSOR COUNTIES...
AT 212 PM EDT...A LINE OF THUNDERSTORMS WAS LOCATED FROM NEAR
POULTNEY VERMONT TO 13 MILES SOUTHWEST OF SALEM...MOVING EAST AT 25
MPH.
WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STORMS. HEAVY
RAIN...WITH UP TO ONE INCH IN ONE HOUR WILL CAUSE WATER TO POND ON
ROADS AND IN POOR DRAINAGE AREAS. THERE MAY BE RAPID RISES ON SMALL
STREAMS AND CREEKS.
LOCATIONS IMPACTED INCLUDE BUT ARE NOT LIMITED TO...
CASTLETON...WEST PAWLET...PAWLET...MIDDLETOWN SPRINGS...WEST
RUTLAND...RUTLAND...MENDON...EAST PITTSFORD...SHREWSBURY...EAST
WALLINGFORD...RUSSELLVILLE...NORTH SHREWSBURY...
LAT...LON 4325 7281 4329 7282 4330 7284 4330 7296
4329 7299 4330 7303 4330 7321 4332 7326
4356 7326 4358 7330 4362 7330 4373 7258
4323 7274
MUCCILLISPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BURLINGTON VT
348 PM EDT SUN AUG 5 2012
NYZ026-029-087-052045-
NORTHERN ST. LAWRENCE NY-SOUTHEASTERN ST. LAWRENCE NY-
SOUTHWESTERN ST. LAWRENCE NY-
348 PM EDT SUN AUG 5 2012
...A STRONG THUNDERSTORM WILL MOVE THROUGH WESTERN ST. LAWRENCE
COUNTY...
AT 342 PM EDT...A STRONG THUNDERSTORM WAS LOCATED NEAR
ANTWERP NEW YORK...MOVING NORTHEAST AT 50 MPH.
WIND GUSTS TO 50 MPH AND FREQUENT LIGHTNING ARE POSSIBLE WITH THIS
STORM. VERY HEAVY RAIN WILL CAUSE WATER TO POND ON ROADS AND IN
POOR DRAINAGE AREAS. THERE MAY BE RAPID RISES ON SMALL STREAMS AND
CREEKS.
LOCATIONS IMPACTED INCLUDE BUT ARE NOT LIMITED TO...
NORTH GOUVERNEUR...RICHVILLE...DE KALB...DE PEYSTER...RENSSELAER
FALLS...CANTON...MADRID...MORLEY...MADRID...CHIPMAN...
LAT...LON 4489 7520 4492 7509 4449 7485 4415 7522
4415 7531 4438 7582
MUCCILLISPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BURLINGTON VT
450 PM EDT SUN AUG 5 2012
NYZ026-027-029-030-087-052145-
NORTHERN FRANKLIN NY-NORTHERN ST. LAWRENCE NY-
SOUTHEASTERN ST. LAWRENCE NY-SOUTHERN FRANKLIN NY-
SOUTHWESTERN ST. LAWRENCE NY-
450 PM EDT SUN AUG 5 2012
...A CLUSTER OF STRONG THUNDERSTORMS WILL MOVE THROUGH NORTHEASTERN
ST. LAWRENCE AND NORTHERN FRANKLIN COUNTIES...
AT 445 PM EDT...A CLUSTER OF STRONG THUNDERSTORMS WAS LOCATED IN
EASTERN SAINT LAWRENCE COUNTY...MOVING NORTHEAST AT 40 MPH.
WIND GUSTS TO 50 MPH AND SMALL HAIL UP TO DIME SIZE ARE POSSIBLE WITH
THIS STORM. EXPECT DANGEROUS LIGHTNING.
LOCATIONS IMPACTED INCLUDE BUT ARE NOT LIMITED TO...
HOPKINTON...CONVERSE...NICHOLVILLE...ST. REGIS FALLS...DICKINSON...
BRUSHTON...WEST BANGOR...BANGOR...MALONE...WHIPPLEVILLE...
CONSTABLE...BURKE...
GET TO SAFETY IMMEDIATELY WHEN THREATENING WEATHER APPROACHES.
LAT...LON 4501 7465 4500 7428 4500 7421 4494 7402
4446 7469 4442 7503 4465 7533 4501 7466
MUCCILLIThe Ft Drum radar (KTYX), 70 km away, was scanning. The volume nearest the first event began at 21:04 UTC.
2 thunderstorm wind. Local standard time, as filed.
Numerous trees and utility wires down by thunderstorm winds.
Several trees and power lines down along Route 30 due to thunderstorm winds.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New York in 2012Every state in 2012This day in weather historyWarnings in New York, August 2012
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: 398880, 398882.