An upper level disturbance approaching from the northern Great Lakes set off a round of showers and thunderstorms across much of central New York. Surface heating ahead of the system and strong wind fields helped to produce numerous strong to severe storms, along with areas of heavy rain.
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 BGM wrote it up.
An upper level disturbance approaching from the northern Great Lakes set off a round of showers and thunderstorms across much of central New York. Surface heating ahead of the system and strong wind fields helped to produce numerous strong to severe storms, along with areas of heavy rain.
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 Binghamton, NY wrote its last area forecast discussion before the first event at Aug 10, 1:04 AM EST, 51 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BINGHAMTON NY 204 AM EDT MON AUG 10 2009 .SYNOPSIS... HIGH PRESSURE WILL KEEP WARM AND HUMID AIR IN THE AREA THROUGH THE FIRST PART OF THE WORK WEEK. THIS WILL RESULT IN PERIODS OF RAIN AND THUNDERSTORMS MOVING ACROSS CENTRAL NEW YORK AND NORTHEAST PENNSYLVANIA THROUGH TUESDAY. && .NEAR TERM /THROUGH TODAY/... WARM FRONT OVER CENTRAL NY INTO NEPA WILL CONTINUE TO PROVIDE FOCUS FOR SHRA/TSRA DEVELOPMENT THIS EVENING. ANOTHER MCS IS ON TARGET TO HIT THE FINGER LKS REGION, SRN TIER AND NEPA FROM ABOUT MIDNIGHT ON. PLENTY OF PREVIOUS RAINFALL IN SOME AREAS...AND PLENTY OF HIGH PWAT AIR IN THE REGION. AM TOYING WITH ISSUING A SHORT TERM FLASH FLOOD WATCH OVER WRN HALF OF CWA FOR THE OVERNIGHT...BUT WILL HOLD OFF ATTM TO EVALUATE RAIN RATES UPSTREAM FOR THE NEXT COUPLE HOURS. HAVE MADE MINOR ADJUSTMENTS TO GRIDDED FCSTS TO ACCOUNT FOR MESOSCALE FEATURES. WILL CONTINUE TO FINE TUNE AS THE NIGHT WEARS ON. ALREADY INCREASED TO LIKELY POPS WESTERN HALF...BUT WILL PROBABLY HAVE TO INCREASE AGAIN TO CAT WITH THE NEXT RAIN SHIELD INBOUND. NO OTHER CHANGES...JUST WARM AND MUGGY TEMPS AND IN AND OUT CLOUDS. && .SHORT TERM /TONIGHT THROUGH WEDNESDAY/... BRIEF DISC DUE TO ONGOING SVR CONV... FLAT RDG ALLOWS SHRT WVS TO ZIP ALONG THRU THE LL UNSTABLE AIR OVER THE AREA. THIS WILL CONT THE TRWS THRU TUE. MORE SIGNIFICANT SHRT WV CARVES OUT A SHRP TROF LTR TUE INTO WED AND IS FLWD BY DRIER AIR FOR WED. THIS SHD BRING A TEMP END TO THE CONV BY THE END OF THE FCST PD. GNRLY USED BLENDED MODEL GUID FOR THE POPS AND TEMPS IN THE GRIDS. FLAT RDG WILL ALLOW TEMPS TO FNLY EXCEED CRNT NRMS...ALTHOUGH EXCESSIVE HEAT IS NOT XPCTD. && .LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/... ACTIVE SHORT TERM CONCERNS THIS AFTN. LTL CHG TO MED RNG PCKG WHICH FOLLOWS HPC GUIDANCE. MAIN QUESTION IS AMOUNT OF UPR LVL TROFINESS OVER THE NE U.S. LATER IN THE WEEK. PREV GFS RUNS APPEARED TOO STRONG/AGGRESSIVE WITH THIS FEATURE AND ASSCD PCPN...LATEST RUN HAS BACKED OFF ON THIS. 00Z EURO WAS DRY. WE WILL CONTINUE WITH A PC/DRY FCST WITH SLGT CHC POPS IN THE GRIDS AND SEASONABLE TO SLIGHTLY ABV NORMAL TEMPS. && .AVIATION /06Z MONDAY THROUGH FRIDAY/... MAINLY MVFR RESTRICTIONS EXPECTED EARLY ON WITH WMFNT IN VICINITY AND SIGNIFICANT LLM...ALONG WITH SHOWERS AND EMBEDDED TSTMS FOR NEXT 1-3 HRS AT ALL BUT SYR/RME. CUD SEE IMPRVG CONDS BY 14-16Z AS AFTN MIXING OCCURS. CANNOT RULE OUT MORE TSTMS DRG THE AFTN...BUT STILL QUITE A BIT OF UNCERTAINTY REGARDING TIMING/LOCATION. THUS HV ONLY INCLUDED CB GROUP AT THIS TIME FOR ALL SITES AFT 18Z. VRBL WINDS OVERNIGHT BECOME SW-WLY 5-10 KTS ON MONDAY. OUTLOOK... LATE MON NGT INTO TUES...OCNL MVFR IN SHRA/TSRA. TUES NGT THRU FRIDAY...VFR...WITH LATE NGT/EARLY MRNG RESTRICTIONS AT ELM DUE TO VLY FOG. && .BGM WATCHES/WARNINGS/ADVISORIES... PA...NONE. NY...NONE. && SYNOPSIS...DGM NEAR TERM...DGM SHORT TERM...DGM LONG TERM... AVIATION...PVN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BINGHAMTON NY 132 AM EDT MON AUG 10 2009 NYZ015>018-022-023-025-044-110545- YATES-SENECA-SOUTHERN CAYUGA-ONONDAGA-STEUBEN-SCHUYLER-TOMPKINS- CORTLAND- 132 AM EDT MON AUG 10 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW YORK. .DAY ONE...TONIGHT. IN ADDITION TO THE POTENTIAL FOR STRONG GUSTY WINDS, LOCALLY HEAVY RAINFALL IS ALSO LIKELY TONIGHT WHICH MAY CAUSE FLOODING OF LOW LYING AREAS AND ALONG TOWN AND VILLAGE STREETS. RAIN WILL ENDING SLOWLY EARLY THIS MORNING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. SCATTERED THUNDERSTORMS ARE AGAIN EXPECTED MONDAY AFTERNOON AND EVENING...WITH A FEW OF THESE STORMS PERHAPS BECOMING SEVERE. STRONG DAMAGING WINDS AND LARGE HAIL WILL BE THE PRIMARY THREATS...WITH LOCALLY HEAVY RAINFALL ALSO POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED MONDAY AFTERNOON AND EVENING. NYZ024-055-056-PAZ038-039-043-110545- CHEMUNG-TIOGA-BROOME-BRADFORD-SUSQUEHANNA-WYOMING- 132 AM EDT MON AUG 10 2009 ...SEVERE THUNDERSTORM WATCH 691 IN EFFECT UNTIL 3 AM EDT EARLY THIS MORNING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW YORK AND NORTHEAST PENNSYLVANIA. .DAY ONE...TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. SEVERE THUNDERSTORM WATCH. A LARGE CLUSTER OF RAIN AND EMBEDDED THUNDERSTORMS WILL MOVE THROUGH THE REGION EARLY THIS MORNING. TORRENTIAL RAINFALL WILL BE LIKELY IN SOME AREAS OF CENTRAL NEW YORK AND NORTHEAST PENNSYLVANIA UNTIL 5 AM. LOCALIZED PONDING OF WATER, AND MOSTLY MINOR FLOODING OF LOW LYING AREAS IS POSSIBLE. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. SCATTERED THUNDERSTORMS ARE AGAIN EXPECTED MONDAY AFTERNOON AND EVENING...WITH A FEW OF THESE STORMS PERHAPS BECOMING SEVERE. STRONG DAMAGING WINDS AND LARGE HAIL WILL BE THE PRIMARY THREATS...WITH LOCALLY HEAVY RAINFALL ALSO POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED MONDAY AFTERNOON AND EVENING. NYZ009-036-037-045-046-057-062-PAZ040-044-047-048-072-110545- NORTHERN ONEIDA-MADISON-SOUTHERN ONEIDA-CHENANGO-OTSEGO-DELAWARE- SULLIVAN-NORTHERN WAYNE-LACKAWANNA-LUZERNE-PIKE-SOUTHERN WAYNE- 132 AM EDT MON AUG 10 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW YORK...SOUTHEASTERN NEW YORK AND NORTHEAST PENNSYLVANIA. .DAY ONE...TONIGHT. ANOTHER LARGE CLUSTER OF RAIN AND EMBEDDED THUNDERSTORMS WILL MOVE THROUGH THE REGION OVERNIGHT. TORRENTIAL RAINFALL WILL BE LIKELY IN SOME AREAS OF CENTRAL NEW YORK AND NORTHEAST PENNSYLVANIA UNTIL 5 AM. LOCALIZED PONDING OF WATER, AND MOSTLY MINOR FLOODING OF LOW LYING AREAS IS POSSIBLE. A LINE OF THUNDERSTORMS MAY ALSO BRING STRONG AND GUSTY WINDS UP TO 40 MPH. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. SCATTERED THUNDERSTORMS ARE AGAIN EXPECTED MONDAY AFTERNOON AND EVENING...WITH A FEW OF THESE STORMS PERHAPS BECOMING SEVERE. STRONG DAMAGING WINDS AND LARGE HAIL WILL BE THE PRIMARY THREATS...WITH LOCALLY HEAVY RAINFALL ALSO POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BINGHAMTON NY 923 PM EDT SUN AUG 9 2009 NYZ015>017-022>025-100400- CHEMUNG-SCHUYLER-SENECA-SOUTHERN CAYUGA-STEUBEN-TOMPKINS-YATES- 923 PM EDT SUN AUG 9 2009 ...STRONG TO SEVERE THUNDERSTORMS INBOUND FROM LAKE ONTARIO... A LINE OF SEVERE THUNDERSTORMS MOVING RAPIDLY ACROSS LAKE ONTARIO ARE FORECAST TO REACH LOCATIONS FROM GENEVA TO PENN YAN TO HORNELL BETWEEN 11 PM AND 1130 PM. WIND GUSTS MAY EXCEED 50 MPH AS THESE STORMS HIT. THE LINE OF STORMS WILL THEN PROGRESS SOUTHWARD THROUGH THE REST OF THE CENTRAL SOUTHERN TIER...INCLUDING ITHACA, WATKINS GLEN AND ELMIRA/CORNING BY 1230 AM. JAB
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BINGHAMTON NY 1038 PM EDT SUN AUG 9 2009 NYZ015-016-022-023-100345- SCHUYLER NY-SENECA NY-STEUBEN NY-YATES NY- 1038 PM EDT SUN AUG 9 2009 ...LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHERN SCHUYLER... NORTHERN STEUBEN...SOUTHERN SENECA AND YATES COUNTIES... * AT 1038 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING STRONG GUSTY WINDS...AND VERY HEAVY RAIN. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 25 MILES NORTHWEST OF VINE VALLEY TO 24 MILES NORTHWEST OF WAYLAND TO 51 MILES WEST OF ARKPORT...AND MOVING SOUTHEAST AT 45 MPH. * STRONG THUNDERSTORMS WILL BE NEAR... MIDDLESEX AT 1115 PM EDT... COHOCTON AND ARKPORT AT 1120 PM EDT... PENN YAN AT 1125 PM EDT... HORNELL AND AVOCA AT 1130 PM EDT... OVID AND HAMMONDSPORT AT 1135 PM EDT... DUNDEE AND BATH AT 1140 PM EDT... COVERT AT 1145 PM EDT... THESE STORMS HAVE THE POTENTIAL TO BECOME SEVERE AND PRODUCE LARGE HAIL AND/OR DAMAGING WINDS.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BINGHAMTON NY
1148 PM EDT SUN AUG 09 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1125 PM FLASH FLOOD ROSCOE 41.93N 74.92W
08/09/2009 SULLIVAN NY LAW ENFORCEMENT
FLASH FLOODING AT ROSCOE CAMPGROUND WITH RESCUES UNDERWAY
&&
PNThe Binghamton radar (KBGM), 6 km away, was scanning. The volume nearest the first event began at 06:55 UTC.
7 hail, 5 flash flood, 4 thunderstorm wind, 1 heavy rain. Local standard time, as filed.
Fox Road was closed due to flooding.
Roads were closed due to flooding.
Several roads were closed due to flooding.
Minor flooding occurred along Pearl Street in Livingston Manor. A bridge was nearly over-topped and filled with debris along Cattail Creek in town. Precautionary evacuations of approximately 10 homes took place at Finch Street and River Street.
Several trees were blown down.
A tree was blown down on power lines.
Manhole covers were knocked off due to heavy rain.
Several trees were blown down.
Several trees were blown down.
The intersection of State Route 12 and Route 206 was impacted by flood waters. Other streets were reported to be flooded as well.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New York in 2009Every state in 2009This day in weather historyWarnings in New York, 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: 193411, 193413, 194107, 193417, 193426, 193418, 193429, 193419, 193420, 193421, 193427, 193422, 193423, 193424, 193428, 194112, 193425.