Showers and thunderstorms formed along a warm front moving northward through Connecticut. One of these storms became severe and produced damaging wind gusts.
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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 BOX wrote it up.
Showers and thunderstorms formed along a warm front moving northward through Connecticut. One of these storms became severe and produced damaging wind gusts.
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 Boston/Norton, MA wrote its last area forecast discussion before the first event at Aug 10, 5:48 PM EST, 2 hours 7 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TAUNTON MA 648 PM EDT MON AUG 10 2009 .SYNOPSIS... A WEAK COLD FRONT WILL MOVE INTO SOUTHERN NEW ENGLAND LATE TONIGHT AND STALL ACROSS THE REGION ON TUESDAY. THE FRONT WILL MOVE SOUTH OF THE COAST TUESDAY NIGHT WITH A WEAK LOW PRES PASSING TO THE SOUTH WEDNESDAY. SEASONABLY WARM AND DRY CONDITIONS THURSDAY AS HIGH PRES BUILDS INTO THE REGION...THEN WARMER AND MORE HUMID CONDITIONS EXPECTED FRIDAY THROUGH THE WEEKEND. && .NEAR TERM /UNTIL 6 AM TUESDAY MORNING/... 6 PM MESOANALYSIS SHOWS MLCAPES 1500-2000 J/KG ACROSS WESTERN PORTIONS OF SNE WITH MAIN INSTABILITY AXIS GREATER THAN 2500 J/KG ACROSS SE NEW YORK. THERE IS STILL SUFFICIENT CIN ACROSS EASTERN SNE WHICH IS ACTING AS A CAP BUT IT HAS ERODED ACROSS FAR W ZONES. CONVECTION IS WELL UNDERWAY FROM LAKES ERIE AND ONTARIO EASTWARD ACROSS MUCH OF NEW YORK STATE. THIS ACTIVITY IS MOVING EASTWARD TOWARDS THE HUDSON VALLEY AS OF 645 PM. WHILE IT REMAINS UNCLEAR WHETHER IT WILL ALL FORM INTO AN MCS...THE GFS IS PICKING UP ON THE CONVECTION AND ITS INSTABILITY SIGNALS INCREASE ACROSS SNE LATER THIS EVENING SO WE WILL HAVE CHC TSTMS WITH GUSTY WIND AND HEAVY RAINFALL. PWATS GREATER THAN 2 INCHES. IT WILL BE A WARM AND HUMID NIGHT WITH PATCHY FOG DEVELOPING... ESPECIALLY CAPE/ISLANDS. MINS MID 60S TO LOWER 70S. && .SHORT TERM /6 AM TUESDAY MORNING THROUGH TUESDAY NIGHT/... SPC STILL HAS AREA OUTLOOKED IN SLIGHT RISK. WEAK COLD FRONT IS EXPECTED TO STALL SOMEWHERE ACROSS EASTERN NEW ENG ON TUE AND SHOULD ACT AS A FOCUS FOR CONVECTION. WILL HAVE CHC TSTMS EVERYWHERE ON TUE BUT GREATEST COVERAGE MAY END UP NEAR THE COASTAL PLAIN WHERE BEST MOISTURE COMBINED WITH LOW LEVEL CONVERGENCE FROM BOUNDARY. SREF ALSO HAS HIGHEST POPS FOR CAPE > 1000 J/KG FOCUSED IN THE COASTAL PLAIN. MLCAPES FORECAST TO BE 1000-1500 J/KG AND THIS COMBINED WITH 0-6KM SHEAR 35-40 KT SUGGESTS ORGANIZED SEVERE POSSIBLE. HEAVY RAIN ALSO A THREAT GIVEN HIGH PWATS AND WILL USE ENHANCED WORDING. 850 MB TEMPS STILL QUITE WARM TUE AND MAV TEMPS LOOK A BIT TOO COOL SO USED A 2:1 MET/MAV BLEND TO GIVE MORE WEIGHT TO WARMER MET TEMPS. MAX TEMPS MAY MAKE A RUN AT 90 HFD-PVD-TAN CORRIDOR IF THERE IS ENOUGH SUNSHINE AND THIS IS NOT CERTAIN. CURRENTLY HAVE UPPER 80S HERE. COOLER BOS DUE TO DEVELOPING SEA BREEZE. FRONT SLIPS SOUTH OF THE COAST TUE NIGHT AND ANY LEFTOVER EVENING SHOWERS/TSTMS SHOULD END FOLLOWED BY DRY CONDITIONS. AREAS OF LOW CLOUDS AND PATCHY FOG MAY DEVELOP OVERNIGHT TUE NIGHT. MAV TEMPS ACCEPTED. && .LONG TERM /WEDNESDAY THROUGH MONDAY/... FAIRLY QUIET IN THE EXTENDED WITH UPPER LEVEL RIDGING AND HIGH PRESSURE BUILDING INTO THE AREA THROUGH THE WEEKEND. WEDNESDAY...THE WARM...MOIST AIRMASS THAT IS IN PLACE OVER THE REGION THROUGH TUESDAY WILL PROVIDE PLENTY OF INSTABILITY THROUGH THE AFTERNOON. COMBINED WITH THE LIFT PROVIDED BY A SHORTWAVE MOVING ACROSS SOUTHERN NEW ENGLAND...THERE WILL BE A CHANCE OF SHOWERS AND THUNDERSTORMS DURING THE AFTERNOON AND EARLY EVENING HOURS. THIS WILL BE INHIBITED SOMEWHAT BY HIGH PRESSURE BUILDING IN AT THE SURFACE. FOR POPS...WILL STICK WITH THE GENERAL IDEA OF THE PREVIOUS SHIFT BUT EXPAND THE SLIGHT CHANCE POPS FURTHER SOUTHWARD TO ACCOUNT FOR UNCERTAINTY. 850MB TEMPS COME DOWN A FEW DEGREES TO 14 TO 15C...WHICH WILL ALLOW SURFACE TEMPERATURES DROP BACK CLOSER TO NORMAL. THURSDAY THROUGH SATURDAY...MODELS ARE IN PRETTY GOOD AGREEMENT WITH UPPER LEVEL RIDGING AND HIGH PRESSURE BUILDING INTO THE AREA. SHOULD BE A QUIET FEW DAYS WITH TEMPERATURES RIGHT AROUND NORMAL WITH MUCH DRIER AIR IN PLACE. SHOULD SEE A GRADUAL WARMING TREND TOWARDS THE WEEKEND. AN ISOLATED AFTERNOON SHOWER OR THUNDERSTORM CANNOT BE RULED OUT. SUNDAY AND MONDAY...A BIT MORE DISCREPANCY IN THE MODELS WITH THE ECMWF CONTINUING THE PATTERN FROM THE END OF THE WEEK AND THE GFS DEVELOPING AN UPPER LEVEL TROUGH THAT MOVES THROUGH SOUTHERN NEW ENGLAND. THE GFS SOLUTION LEADS TO A BETTER CHANCE OF PRECIPITATION FOR THOSE TWO DAYS. AM LEANING MORE TOWARDS THE DRIER ECMWF SOLUTION...HOWEVER...CANNOT RULE THE GFS SOLUTION OUT COMPLETELY. WILL GO WITH SLIGHT CHANCE POPS DURING THIS TIME PERIOD. && .AVIATION /00Z TUESDAY THROUGH SATURDAY/... THIS AFTERNOON...VFR EXCEPT WDLY SCT MVFR/IFR WITH G40KT POSSIBLE FROM ANY TSTMS. ONLY HAVE CB IN TAFS AS NO DEVELOPMENT YET. TONIGHT...VFR MAY LOWER TO A PERIOD OF MVFR IF SHOWERS/TSTMS FROM POSSIBLE MCS MOVE THROUGH. CONFIDENCE LOW. OTHERWISE...IFR STRATUS/FOG DEVELOPING LATE ACROSS CAPE/ISLANDS WITH MVFR CONDITIONS POSSIBLE ELSEWHERE. TUE...MORNING MVFR/IFR IN ST/FOG...THEN IMPROVING TO VFR. BUT BRIEF MVFR/IFR CONDS POSSIBLE SCT TSTMS. HIGHEST PROBABILITY OF CONVECTION MAY BE ACROSS EASTERN NEW ENG. AFTERNOON SEA BREEZE POSSIBLE AT BOS. OUTLOOK /WEDNESDAY THROUGH SATURDAY/... MAINLY VFR WITH ISOLD SHRA/TSRA POSSIBLE EACH AFTERNOON/EVENING. && .MARINE... NO HEADLINES THROUGH TUE NIGHT WITH WINDS AND SEAS BELOW SCA THRESHOLDS. VSBY RESTRICTIONS IN FOG AND ANY TSTMS WILL BE MAIN HAZARDS. OUTLOOK /WEDNESDAY THROUGH SATURDAY/... SEAS 1 TO 3 FEET THROUGH THE FORECAST PERIOD WITH NORTHEAST WINDS 10 TO 15 KTS SHIFTING TO THE SOUTH THURSDAY AFTERNOON. ISOLATED SHOWERS AND THUNDERSTORMS POSSIBLE EACH AFTERNOON. && .BOX WATCHES/WARNINGS/ADVISORIES... CT...NONE. MA...NONE. NH...NONE. RI...NONE. MARINE...NONE. && SYNOPSIS...KJC/RLG NEAR TERM...KJC/RLG SHORT TERM...KJC LONG TERM...RLG AVIATION...KJC/RLG MARINE...KJC/RLG
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TAUNTON MA 419 PM EDT MON AUG 10 2009 CTZ002>004-MAZ002>024-026-NHZ011-012-015-RIZ001>008-112030- HARTFORD CT-TOLLAND CT-WINDHAM CT-WESTERN FRANKLIN MA- EASTERN FRANKLIN MA-NORTHERN WORCESTER MA-CENTRAL MIDDLESEX MA- WESTERN ESSEX MA-EASTERN ESSEX MA-WESTERN HAMPSHIRE MA- WESTERN HAMPDEN MA-EASTERN HAMPSHIRE MA-EASTERN HAMPDEN MA- SOUTHERN WORCESTER MA-WESTERN NORFOLK MA-SOUTHEAST MIDDLESEX MA- SUFFOLK MA-EASTERN NORFOLK MA-NORTHERN BRISTOL MA- WESTERN PLYMOUTH MA-EASTERN PLYMOUTH MA-SOUTHERN BRISTOL MA- SOUTHERN PLYMOUTH MA-BARNSTABLE MA-DUKES MA-NANTUCKET MA- NORTHERN MIDDLESEX MA-CHESHIRE NH-EASTERN HILLSBOROUGH NH- WESTERN AND CENTRAL HILLSBOROUGH NH-NORTHWEST PROVIDENCE RI- SOUTHEAST PROVIDENCE RI-WESTERN KENT RI-EASTERN KENT RI-BRISTOL RI- WASHINGTON RI-NEWPORT RI-BLOCK ISLAND RI- 419 PM EDT MON AUG 10 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN CONNECTICUT...CENTRAL MASSACHUSETTS...EASTERN MASSACHUSETTS...NORTHEASTERN MASSACHUSETTS...SOUTHEASTERN MASSACHUSETTS...WESTERN MASSACHUSETTS...SOUTHERN NEW HAMPSHIRE...NORTHERN RHODE ISLAND AND SOUTHERN RHODE ISLAND. .DAY ONE...THIS AFTERNOON AND TONIGHT. THERE IS A LOW PROBABILITY OF AN ISOLATED THUNDERSTORM WITH HEAVY RAIN AND GUSTY WIND THROUGH EARLY EVENING IN THE DISTANT INTERIOR. THEN A CLUSTER OF THUNDERSTORMS DEVELOPING NEAR THE GREAT LAKES MAY MOVE INTO THE REGION FROM THE WEST LATER TONIGHT. IF THESE STORMS HOLD TOGETHER THEY WILL HAVE THE POTENTIAL TO PRODUCE DAMAGING WIND AND HEAVY RAINFALL WITH ASSOCIATED STREET FLOODING/POSSIBLE BRIEF POOR DRAINAGE ROAD CLOSURES. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. SCATTERED THUNDERSTORMS ARE POSSIBLE AGAIN ON TUESDAY WITH THE POTENTIAL FOR SOME STORMS TO PRODUCE DAMAGING WIND AND HEAVY RAINFALL. LATEST FORECAST INFORMATION SUGGEST THE GREATEST RISK WILL BE ALONG AND SOUTH OF THE MASS PIKE. ISOLATED THUNDERSTORMS POSSIBLE WEDNESDAY AFTERNOON AND AGAIN EACH AFTERNOON FRIDAY THROUGH SUNDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED TONIGHT AND TUESDAY. ANZ230>237-250-251-254>256-112030- BOSTON HARBOR-CAPE COD BAY-NANTUCKET SOUND-VINEYARD SOUND- BUZZARDS BAY-RHODE ISLAND SOUND-NARRAGANSETT BAY-BLOCK ISLAND SOUND- COASTAL WATERS EAST OF IPSWICH BAY AND THE STELLWAGEN BANK NATIONAL MARINE SANCTUARY-MASSACHUSETTS BAY AND IPSWICH BAY- COASTAL WATERS FROM PROVINCETOWN MA TO CHATHAM MA TO NANTUCKET MA OUT 20 NM- COASTAL WATERS EXTENDING OUT TO 25 NM SOUTH OF MARTHAS VINEYARD AND NANTUCKET- COASTAL WATERS FROM MONTAUK NY TO MARTHAS VINEYARD EXTENDING OUT TO 20 NM SOUTH OF BLOCK ISLAND- 419 PM EDT MON AUG 10 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR MASSACHUSETTS COASTAL WATERS AND RHODE ISLAND COASTAL WATERS. .DAY ONE...THIS AFTERNOON AND TONIGHT. SCATTERED THUNDERSTORMS ARE POSSIBLE OVERNIGHT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. SCATTERED STRONG THUNDERSTORMS WITH GUSTY WINDS ARE POSSIBLE TUESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE TAUNTON MA 838 PM EDT MON AUG 10 2009 CTZ003-004-110145- TOLLAND CT-WINDHAM CT- 838 PM EDT MON AUG 10 2009 AT 835 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A DEVELOPING THUNDERSTORM WITH THE POTENTIAL TO PRODUCE WIND GUSTS TO 40 MPH 4 MILES NORTHEAST OF TOLLAND...OR ABOUT 7 MILES NORTHWEST OF MANSFIELD...MOVING EAST AT 40 MPH. * SOME LOCATIONS AFFECTED INCLUDE...WILLINGTON...STAFFORD...STORRS... MANSFIELD...UNION...CHAPLIN...ASHFORD...EASTFORD...HAMPTON... WOODSTOCK...POMFRET...BROOKLYN...PUTNAM...DANIELSON...KILLINGLY AND THOMPSON. FOR YOUR SAFETY...GET INSIDE WHEN THIS STORM APPROACHES. HEAVY RAIN MAY CAUSE MINOR STREET FLOODING AS WELL AS PONDING OF WATER IN POOR DRAINAGE AREAS. FRANK
The Boston radar (KBOX), 111 km away, was scanning. The volume nearest the first event began at 00:56 UTC.
1 thunderstorm wind. Local standard time, as filed.
Large tree branches were downed by thunderstorm winds.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Connecticut in 2009Every state in 2009This day in weather historyWarnings in Connecticut, August 2009
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: 192284.