The combination of a passing upper level trough, and unusually cold air in the mid and upper levels of the atmosphere, led to the development of numerous thunderstorms across southern Vermont, many of which contained large quantities of hail. The thunderstorms developed during the afternoon hours, and continued through early evening on Monday June 15th.
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 ALY wrote it up.
The combination of a passing upper level trough, and unusually cold air in the mid and upper levels of the atmosphere, led to the development of numerous thunderstorms across southern Vermont, many of which contained large quantities of hail. The thunderstorms developed during the afternoon hours, and continued through early evening on Monday June 15th.
In addition, some thunderstorms were slow moving, and produced locally very intense rainfall rates. This led to flash flooding in some areas.
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 Albany, NY wrote its last area forecast discussion before the first event at Jun 15, 12:47 PM EST, 38 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ALBANY NY 147 PM EDT MON JUN 15 2009 .SYNOPSIS... ANOTHER IN A SERIES OF UPPER LEVEL DISTURBANCES WILL MOVE OVER THE REGION TODAY TRIGGERING ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS. HIGH PRESSURE WILL THEN BUILD IN FOR THE MID WEEK. HOWEVER UNSETTLED WEATHER WILL RETURN BY THE END OF THE WORK WEEK. && .NEAR TERM /THROUGH TONIGHT/... THE EMBEDDED SHORT WAVE THAT BROUGHT SHOWERS/THUNDERSTORMS TO THE REGION...WITH A FEW REPORTS OF >2 OF RAIN...HAS TRACKED EAST. THE NEXT SHORT WAVE SEEN IN THE H2O VAPOR IMAGERY THIS MORNING ACROSS EASTERN LAKE ONTARIO WILL APPROACH THE REGION TODAY. BASED ON 12Z SOUNDINGS...THE COLD POOL AT 500MB WAS ANALYZED AROUND -20C WITH A MID LEVEL DRY AIR BETWEEN 500-700MB. WHILE PWATS ARE NOT EXPECTED TO BE TOO MUCH HIGHER THAN 1 INCH...WITH STEERING FLOW ALOFT QUITE LIGHT...COULD SEE ADDITIONAL FLOODING CONCERNS /MINOR FLOODING AT THE CURRENT TIME/. FORECAST CAPES APPEAR TO BE AROUND 1000 J/KG IF WE ARE ABLE TO GET ENOUGH HEATING. BASED ON THE 1KM VIS...SEEMS THE HUDSON RIVER VALLEY AND POINTS EAST REMAIN UNDER THE BLANKET OF STRATUS WITH MOSUNNY CONDITIONS FOR PORTIONS OF THE CATSKILLS...MOHAWK VALLEY AND EASTERN DACKS. GOES EAST RSO WAS REQUESTED AND WILL BE AVAILABLE SHORTLY. WET BULB ZERO HEIGHTS ARE RATHER LOW 7-8K FEET SO THUNDERSTORMS WILL BE CAPABLE TO PRODUCE SOME HAIL. REMAINDER OF THE DISCUSSION FOLLOWS... NEXT SHORT WAVE/UPPER LEVEL TROUGH HEADING OUR WAY...ITS PUSHING ACROSS THE EASTERN GREAT LAKES. UPPER TROUGH AXIS WILL MOVE OFFSHORE LATE TONIGHT. THE GFS KEEPS THE UPPER TROUGH OPEN AND PROGRESSIVE WHILE THE NAM CLOSES OFF A LOW. MODEL CONSENSUS SUPPORTS THE GFS. CONVECTION WAS PERSISTENT THROUGH THE EARLY MORNING HOURS AND HAS NOT CLEAR THE FORECAST AREA YET. WILL KEEP LINGER POP TO HANDLE. WE WILL HAVE A NULL BEFORE THE NEXT ROUND OF CONVECTION FIRES TODAY. CONVECTION MOVING ACROSS LAKE ONTARIO INTO THE TUG HILL. WITH UPPER LEVELS COOLING TO -18 TO -20 DEGREES CELSIUS AT 500 MB LAPSE RATES WILL BECOME STEEP AT 6.5-7.0 C/KM WITH DAYTIME HEATING. THIS ALONG WITH MODEST FORECAST MODEL CAPE OF AROUND 1000 J/KG...SOME STRONG THUNDERSTORMS ARE POSSIBLE. DEEP LAYER SHEAR WEAK SO MAIN THREAT WILL BE HAIL. ALSO WITH WEAK MID LEVEL FLOW STORMS WILL BE SLOW MOVING AND WITH PRECIPITABLE WATER VALUES AROUND AN INCH HEAVY DOWNPOURS WILL ACCOMPANY STORMS (REFER TO HYDROLOGY SECTION FOR MORE DETAILS). WILL MENTION THREATS IN HAZARDOUS WEATHER OUTLOOK. THREAT FOR CONVECTION WILL DIMINISH THROUGH THE EVENING WITH DECREASING POPS. HOWEVER...PATCHY FOG WILL DEVELOP. && .SHORT TERM /TUESDAY THROUGH TUESDAY NIGHT/... RIDGE BUILDS IN TUESDAY HOWEVER WITH LINGERING MOISTURE AND DAYTIME HEATING CAN COMPLETELY RULE OUT CHANCE OF CONVECTION ACROSS THE HIGHER TERRAIN DURING THE AFTERNOON SO HAVE A 20 POP. OTHERWISE...HEIGHTS RISE AND SURFACE RIDGE OVER NORTHERN NEW ENGLAND BUILDS IN. DRY TUESDAY NIGHT INTO WEDNESDAY NIGHT AS RIDGE DOMINATES. TEMPERATURES WILL MODERATE WITH HIGHS AROUND 80 DEGREES FORECAST FOR THE THE HUDSON AND MOHAWK RIVER VALLEYS. && .LONG TERM /WEDNESDAY THROUGH SUNDAY/... WEATHER PATTERN RETURNS TO UNSETTLED AS WE HEAD INTO THE WEEKEND. MODELS ARE IN AGREEMENT THAT THE LONGWAVE TROUGH RETURNS TO THE GREAT LAKES REGION AND THE NORTHEAST AND THE PATTERN AMPLIFIES OVER THE CONUS OVER THE WEEKEND. THE DIFFERENCES ARE IN THE TIMING AND AMPLITUDE OF THE INDIVIDUAL SHORT WAVES MOVING THROUGH THE FLOW. RIDGING ALOFT IS FORECAST FOR FRIDAY HOWEVER TROUGH WILL REMAIN IN PLACE AT LOWER LEVELS. STRONG NORTHERN STREAM SHORT WAVE WILL DIG TROUGH OVER THE GREAT LAKES REGION AND THE NORTHEAST OVER THE WEEKEND. THE MODELS INDICATE A CUT OFF LOW WILL FORM BY THE END OF THE WEEKEND WHICH COULD PERSIST INTO EARLY NEXT WEEK. && .AVIATION /18Z MONDAY THROUGH SATURDAY/... CONVECTION WILL CONTINUE ACROSS EASTERN NY AND ADJACENT WESTERN NEW ENGLAND THROUGH THE REST OF THE AFTERNOON AND INTO EARLY EVENING HOURS. SHOWERS AND STORMS ARE GENERALLY MOVING EASTWARD WITH INDIVIDUAL STORM MOTION TAKING A MORE SOUTHERLY TRACK. VFR CONDITIONS EXPECTED THROUGH THE AFTERNOON...EXCEPT WITHIN SHOWERS AND STORMS WHERE MVFR CIGS AND VSBYS ARE LIKELY WITH HEAVY RAINFALL. WITH HIGH PRESSURE BUILDING IN OVERNIGHT...RADIATION FOG COULD DEVELOP. AFTER MIDNIGHT...MVFR CIGS AND VSBYS EXPECTED AT ALL TERMINALS DURING THROUGH TUESDAY MORNING. SOUTHERLY WINDS 4-7KTS WILL BECOME LIGHT TO CALM OVERNIGHT AND REMAIN LIGHT THROUGH LATE TUESDAY MORNING. OUTLOOK... TUE-WED...MAINLY VFR...POSSIBLE MVFR/IFR EARLY MORNING. THU-SAT...VFR...CHC MVFR ASSOC WITH -SHRA. && .HYDROLOGY... SHOWERS AND THUNDERSTORMS MOVED THROUGH MUCH OF THE AREA SUNDAY NIGHT INTO THIS MORNING...WITH RAINFALL AMOUNTS OF GENERALLY ONE QUARTER TO THREE QUARTERS OF AN INCH. HOWEVER...WHERE SLOW MOVING THUNDERSTORMS PRODUCED HEAVY RAINFALL...ONE TO TWO INCHES OF RAIN OCCURRED ACROSS NARROW BANDS IN ALBANY...RENSSELAER...COLUMBIA... ULSTER AND DUTCHESS COUNTIES. SO FAR ONLY MINOR RISES HAVE OCCURRED ON MAIN STEM RIVERS. ADDITIONAL RAINFALL WILL OCCUR TODAY...AS SHOWERS AND THUNDERSTORMS ARE LIKELY ASSOCIATED WITH A DISTURBANCE MOVING THROUGH. ONCE AGAIN HEAVY RAINFALL IS POSSIBLE...AS THE SHOWERS AND STORMS WILL BE SLOW MOVING. MINOR URBAN AND SMALL STREAM FLOODING IS POSSIBLE...AND ISOLATED FLASH FLOODING MAY OCCUR ESPECIALLY ACROSS HIGHER TERRAIN OR URBAN AREAS. WHERE CONVECTION OCCURS...RAINFALL AMOUNTS OF ONE HALF TO ONE INCH WILL OCCUR...ALTHOUGH HIGHER AMOUNTS EXCEEDING TWO INCHES WILL BE POSSIBLE IN SLOW MOVING THUNDERSTORMS. THERE WILL BE SOME WITHIN BANK RISES ON MAIN STEM RIVERS. MAINLY DRY WEATHER IS EXPECTED TUESDAY AND WEDNESDAY...HOWEVER CHANCES FOR RAINFALL INCREASE THURSDAY INTO FRIDAY...AS A WARM FRONT APPROACHES. FOR DETAILS ON SPECIFIC AREA RIVERS AND LAKES...INCLUDING OBSERVED AND FORECAST RIVER STAGES AND LAKE ELEVATIONS...PLEASE VISIT THE ADVANCED HYDROLOGIC PREDICTION SERVICE /AHPS/ GRAPHS ON OUR WEBSITE. && .ALY WATCHES/WARNINGS/ADVISORIES... CT...NONE. NY...NONE. MA...NONE. VT...NONE. && SYNOPSIS... NEAR TERM... SHORT TERM... LONG TERM... AVIATION...KGS HYDROLOGY...
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ALBANY NY 439 AM EDT MON JUN 15 2009 CTZ001-013-MAZ001-025-NYZ032-033-038>043-047>054-058>061-063>066- 082>084-VTZ013>015-161100- NORTHERN LITCHFIELD-SOUTHERN LITCHFIELD-NORTHERN BERKSHIRE- SOUTHERN BERKSHIRE-NORTHERN HERKIMER-HAMILTON-SOUTHERN HERKIMER- SOUTHERN FULTON-MONTGOMERY-NORTHERN SARATOGA-NORTHERN WARREN- NORTHERN WASHINGTON-SCHOHARIE-WESTERN SCHENECTADY- EASTERN SCHENECTADY-SOUTHERN SARATOGA-WESTERN ALBANY-EASTERN ALBANY- WESTERN RENSSELAER-EASTERN RENSSELAER-WESTERN GREENE-EASTERN GREENE- WESTERN COLUMBIA-EASTERN COLUMBIA-WESTERN ULSTER-EASTERN ULSTER- WESTERN DUTCHESS-EASTERN DUTCHESS-NORTHERN FULTON-SOUTHEAST WARREN- SOUTHERN WASHINGTON-BENNINGTON-WESTERN WINDHAM-EASTERN WINDHAM- 439 AM EDT MON JUN 15 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWESTERN CONNECTICUT...WESTERN MASSACHUSETTS...EAST CENTRAL NEW YORK AND SOUTHERN VERMONT. .DAY ONE...TODAY AND TONIGHT. THERE IS A CHANCE FOR THUNDERSTORMS TODAY AS ANOTHER UPPER LEVEL DISTURBANCE MOVES OVER THE REGION. THE STORMS WILL BE SLOW MOVERS AND WILL BE CAPABLE OF PRODUCING HEAVY DOWNPOURS WHICH COULD LEAD TO MINOR URBAN AND SMALL STREAM FLOODING AND EVEN ISOLATED FLASH FLOODING. ALSO...SOME THUNDERSTORMS MAY PRODUCE SMALL HAIL. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THERE IS A CHANCE FOR THUNDERSTORMS SATURDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ALBANY NY 1234 PM EDT MON JUN 15 2009 VTZ013>015-151715- BENNINGTON VT-EASTERN WINDHAM VT-WESTERN WINDHAM VT- 1234 PM EDT MON JUN 15 2009 ...A STRONG THUNDERSTORM IN BENNINGTON AND WINDHAM COUNTIES... AT 1232 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM CAPABLE OF PRODUCING...AROUND HALF INCH HAIL...FREQUENT LIGHTNING...AND HEAVY RAIN. THIS STORM WAS LOCATED NEAR STRATTON... OR ABOUT OVER STRATTON...AND MOVING NORTHEAST AT 5 MPH. THE THUNDERSTORM WILL BE NEAR... 7 MILES SOUTH OF LONDONDERRY AND 9 MILES NORTHWEST OF TOWNSHEND BY 115 PM EDT IN ADDITION TO HAIL AND HEAVY RAINFALL...CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. BGM
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ALBANY NY 1255 PM EDT MON JUN 15 2009 NYZ042-043-151730- NORTHERN WARREN NY-NORTHERN WASHINGTON NY- 1255 PM EDT MON JUN 15 2009 ...STRONG THUNDERSTORMS IN WARREN AND WASHINGTON COUNTIES... AT 1251 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS CAPABLE OF PRODUCING...AROUND HALF INCH HAIL. THESE STORMS WERE LOCATED BETWEEN BOLTON LANDING AND WHITEHALL. THE STORMS WERE MOVING EAST AT 10 MPH. THE THUNDERSTORM WILL BE NEAR... BOLTON LANDING BY 110 PM EDT 8 MILES WEST OF WHITEHALL BY 130 PM EDT IN ADDITION TO LARGE HAIL AND STRONG WINDS...CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STORMS. MOVE INDOORS IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. IF ON OR NEAR LAKE GEORGE GET OUT OF THE WATER AND MOVE INDOORS OR INSIDE A VEHICLE. REMEMBER...LIGHTNING CAN STRIKE OUT TO 15 MILES FROM THE PARENT THUNDERSTORM. OKEEFE
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ALBANY NY
102 PM EDT MON JUN 15 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1244 PM HAIL KERHONKSON 41.78N 74.30W
06/15/2009 E0.75 INCH ULSTER NY TRAINED SPOTTER
&&
ROKEEFESPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ALBANY NY 115 PM EDT MON JUN 15 2009 NYZ063-064-151745- EASTERN ULSTER NY-WESTERN ULSTER NY- 115 PM EDT MON JUN 15 2009 ...A STRONG THUNDERSTORM IN ULSTER COUNTY... AT 114 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM CAPABLE OF PRODUCING...AROUND HALF INCH HAIL...FREQUENT LIGHTNING...AND HEAVY RAIN. THIS STORM WAS LOCATED NEAR MOUNT TREMPER...OR ABOUT 9 MILES SOUTH OF HUNTER...AND MOVING SOUTHEAST AT 5 MPH. THE THUNDERSTORM WILL BE NEAR... KENNETH L WILSON CAMPGROUND...WOODSTOCK AND WEST HURLEY BY 145 PM EDT THIS IS A DANGEROUS STORM. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. BGM
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ALBANY NY 133 PM EDT MON JUN 15 2009 NYZ042-043-083-151815- NORTHERN WARREN NY-SOUTHEAST WARREN NY-NORTHERN WASHINGTON NY- 133 PM EDT MON JUN 15 2009 ...STRONG THUNDERSTORMS IN WARREN AND WASHINGTON COUNTIES... AT 132 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS CAPABLE OF PRODUCING...AROUND HALF INCH HAIL. THIS STORM WAS LOCATED NEAR BOLTON LANDING...OR ABOUT 8 MILES NORTHEAST OF LAKE GEORGE VILLAGE...AND MOVING EAST AT 10 MPH. THESE THUNDERSTORMS WILL BE NEAR... COMSTOCK AND WHITEHALL BY 215 PM EDT IF ON OR NEAR LAKE GEORGE GET OUT OF THE WATER AND MOVE INDOORS OR INSIDE A VEHICLE. REMEMBER...LIGHTNING CAN STRIKE OUT TO 15 MILES FROM THE PARENT THUNDERSTORM.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ALBANY NY 219 PM EDT MON JUN 15 2009 MAZ001-025-151845- SOUTHERN BERKSHIRE MA-NORTHERN BERKSHIRE MA- 219 PM EDT MON JUN 15 2009 ...A STRONG THUNDERSTORM IN BERKSHIRE COUNTY... AT 219 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM CAPABLE OF PRODUCING...AROUND HALF INCH HAIL...FREQUENT LIGHTNING. THIS STORM WAS LOCATED NEAR LENOX...OR ABOUT 9 MILES SOUTHWEST OF PITTSFIELD...AND MOVING EAST AT 10 MPH. THE THUNDERSTORM WILL BE NEAR... LENOX BY 240 PM EDT LEE BY 245 PM EDT IN ADDITION TO LARGE HAIL AND STRONG WINDS...CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. BGM
The Albany radar (KENX), 78 km away, was scanning. The volume nearest the first event began at 18:27 UTC.
1 hail, 1 flash flood. Local standard time, as filed.
Quarter size hail was measured at the Bennington Morse State Airport in Bennington during a thunderstorm. In addition, nickel to quarter size hail was also reported in the city of Bennington.
Cars were reported stalled in flood waters in downtown Bennington due to flash flooding from heavy rainfall.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Vermont in 2009Every state in 2009This day in weather historyWarnings in Vermont, June 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: 170999, 171004.