Showers and thunderstorms developed as a warm front interacted with lake breeze boundaries during the evening hours. In the Town of Allegany an isolated thunderstorm produced winds that downed trees and power lines.
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 BUF wrote it up.
Showers and thunderstorms developed as a warm front interacted with lake breeze boundaries during the evening hours. In the Town of Allegany an isolated thunderstorm produced winds that downed trees and power lines. Overnight, as the storms continue to move further east a couple of other storms in Oswego county produced damaging winds. In Schroeppel, downed trees blocked Route 264. In West Monroe, a falling tree damaged an automobile. Across the southern tier, rainfall totals from the storms approached two inches. Minor flooding issues were reported by the 911 centers.
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 Buffalo, NY wrote its last area forecast discussion before the first event at Sep 1, 3:05 PM EST, 2 hours 22 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BUFFALO NY 405 PM EDT SUN SEP 1 2013 .SYNOPSIS... WARM AND MUGGY CONDITIONS WILL PREVAIL THROUGH TONIGHT AND LABOR DAY ACCOMPANIED BY SHOWERS AND A FEW THUNDERSTORMS AHEAD OF AN APPROACHING COLD FRONT. THIS FRONT WILL CROSS THE REGION MONDAY NIGHT USHERING IN A PERIOD OF MILDER AND QUIETER WEATHER. && .NEAR TERM /THROUGH MONDAY/... REGIONAL RADAR IMAGERY SHOWING SHOWERS INCREASING IN COVERAGE THIS AFTERNOON JUST TO OUR WEST ACROSS LAKE ERIE AND NORTHERN PA/OH. THIS ACTIVITY IS ASSOCIATED WITH A POTENT MID-LEVEL TROUGH THAT IS DROPPING ACROSS THE UPPER GREAT LAKES. THE COMBINATION OF ABUNDANT LOW LEVEL MOISTURE AND MODERATE INSTABILITY WITH MLCAPES IN THE 500-1000 J/KG RANGE COUPLED WITH SURFACE CONVERGENCE ALONG A STALLED BOUNDARY ACROSS WESTERN/CENTRAL NY IN ADDITION TO FALLING HEIGHTS ALOFT WITH THE APPROACHING MID LEVEL TROUGH MEANS THAT IT IS SHAPING UP TO BE A WET NIGHT ACROSS THE FORECAST AREA. EXPECT SHOWERS ALONG WITH ISOLATED THUNDERSTORMS TO EXPAND IN COVERAGE ACROSS WESTERN NEW YORK FROM LATE AFTERNOON ONWARDS. THIS BATCH OF SHOWERS AND THUNDERSHOWERS WILL CONTINUE TO TRACK ACROSS THE GENESEE VALLEY THIS EVENING AND INTO THE NORTH COUNTRY LATER TONIGHT. AFTER THAT...EXPECT A LULL IN ACTIVITY OVERNIGHT WITH THE LOSS OF DIURNAL INSTABILITY BEFORE THE NEXT ROUND OF SHOWERS/THUNDERSTORMS STARTS UP AGAIN BY LATE TUESDAY MORNING AHEAD OF AN APPROACHING COLD FRONT. ONCE AGAIN...WITH THE BROAD SWATH OF MOIST AND UNSTABLE AIR IN PLACE ACROSS THE REGION AND THE LARGE SCALE FORCING AHEAD OF THE APPROACHING COLD FRONT/MID-LEVEL TROUGH...WIDESPREAD SHOWER ACTIVITY WITH ISOLATED THUNDERSTORMS CAN BE EXPECTED ACROSS THE REGION ON LABOR DAY. REGARDING TEMPERATURES...ABUNDANT CLOUD COVER AND DEWPOINTS RUNNING IN THE MID TO UPPER 60S WILL KEEP OVERNIGHT LOWS LIMITED TO THE MID TO UPPER 60S NEAR THE LAKES WITH LOW TO MID 60S ACROSS HIGHER ELEVATIONS OF THE TUG HILL AND SOUTHERN TIER. LIKEWISE...THE CLOUDS/SHOWERS SHOULD HELP KEEP A LID ON TEMPERATURES MONDAY WITH HIGHS AROUND 80 ACROSS THE FINGER LAKES AND GENESEE VALLEY WITH 70S ELSEWHERE. && .SHORT TERM /MONDAY NIGHT THROUGH WEDNESDAY NIGHT/... FOR MONDAY NIGHT...SHOWERS AND ISOLATED EVENING THUNDERSTORMS WILL DIMINISH AS THE COLD FRONT AND ITS ASSOCIATED LIFT PUSHES EASTWARD THROUGH THE REMAINDER OF THE CWA. THOUGH SKIES WILL LIKELY REMAIN MOSTLY CLOUDY THROUGH THE NIGHT THE COOLER AIR PUSHING IN BEHIND THE COLD FRONT WILL LOWER OVERNIGHT LOWS...AND ALSO LOWER THE DEWPOINTS INTO A MORE COMFORTABLE RANGE. OVERNIGHT LOWS WILL DROP BACK INTO THE 50S TO A FEW LOWER 60S ALONG THE IMMEDIATE LAKE SHORELINE. ON TUESDAY AN UPPER LEVEL TROUGH WILL STILL REMAIN OVERHEAD AND WITH A STILL UNSTABLE ATMOSPHERE THERE WILL STILL BE A CHANCE FOR SHOWERS THROUGH THE DAY...ESPECIALLY FROM MIDDAY THROUGH EARLY EVENING WHEN SOLAR HEATING ADDS TO THE DAYTIME INSTABILITY. ALSO AIDING IN THE LIFT THROUGH THE DAY WILL BE THE LEFT FRONT QUAD OF A 100 KNOT 250 HPA JET. THE AXIS OF THIS TROUGH WILL CROSS THE REGION TUESDAY SUCH THAT A DIMINISHING TREND TO THE SHOWERS WILL BE FOUND TUESDAY NIGHT. EXPECT SOME CLEARING THROUGH THE NIGHT ACROSS THE REGION. HOWEVER WINDS WILL VEER TO NORTHWEST BEHIND THE TROUGH AND WITH THE RECENT RAINS SOME LOW STRATUS AND CLOUDS MAY FILL IN THROUGH THE NIGHT...ESPECIALLY ACROSS WESTERN NEW YORK. LOWS TUESDAY NIGHT WILL BE SEASONABLE IN THE 50S. ON WEDNESDAY HIGH PRESSURE WILL SETTLE INTO THE OHIO VALLEY...WITH A RIDGE AXIS EXTENDING UPWARDS THROUGH THE EASTERN GREAT LAKES. EXPECT A DRY DAY WEDNESDAY AS DRY AIR ADVANCES INTO THE REGION BEHIND THE UPPER LEVEL TROUGH. SLIGHT WARM AIR ADVECTION AND DAYTIME HEATING WILL LIKELY BRING FAIR WEATHER CU THROUGH THE AFTERNOON. LATER WEDNESDAY AND WEDNESDAY NIGHT A COLD FRONT DROPPING SOUTHWARD FROM CANADA MAY CLIP THE EASTERN LAKE ONTARIO REGION. THERE IS STILL SOME UNCERTAINTY WITH NOT ONLY PRECIPITATION ALONG THIS FRONT...BUT THE WESTERN AND SOUTHERN EXTEND OF THE COLD POOL. FOR NOW WILL JUST INDICATE SOME INCREASE IN CLOUDS THROUGH THE EASTERN LAKE ONTARIO REGION WEDNESDAY NIGHT WITH PERHAPS A SHOWER THROUGH THE NORTH COUNTRY. EXPECT SEASONAL TEMPERATURES WEDNESDAY AND WEDNESDAY NIGHT. && .LONG TERM /THURSDAY THROUGH SUNDAY/... THERE IS STILL A BIT OF UNCERTAINTY TO START THE EXTENDED PERIOD OF THE FORECAST PERIOD. WHAT WE KNOW IS ANOTHER STRONG UPPER LEVEL RIDGE WILL BE FOUND OVER THE ROCKIES AND EXTENDING NORTHWARD INTO CANADA. TO THE EAST A BROAD TROUGH OR LOW PRESSURE WILL BE DIPPING ACROSS EASTERN CANADA AND DOWN INTO THE EASTERN US. WHERE THE UNCERTAINTY LIES IS WITH A SHORTWAVE...AND JUST HOW MUCH IT WILL DEEPEN THIS EASTERN US TROUGH. THE GFS HAS BEEN FLUCTUATION THE MOST OF THE GLOBAL MODELS (GFS,ECMWF AND CMC) EITHER DEEPENING THE TROUGH...OR KEEPING MUCH OF THE SHORTWAVE ENERGY TO OUR NORTH. THE ECMWF HAS BEEN THE MOST CONSISTENT IN DROPPING THE POTENT SHORTWAVE DOWN ACROSS THE NORTHEAST WITH A STEEP DROP IN 850 HPA TEMPERATURES. THE CANADA IS IN THE MIDDLE...BUT DEFLECTS MUCH OF THE COOLER AIR TO OUR EAST. FOR NOW WILL JUST LEAVE CONTINUITY UNTIL A CLEARER SOLUTION DEVELOPS. HIGH PRESSURE WILL ENTER INTO OUR REGION ON FRIDAY WITH DRY AND COMFORTABLE FALL WEATHER EXPECTED. AS THIS HIGH PRESSURE SLIDES EASTWARD A RETURN FLOW OF MOISTURE INTO THE OHIO VALLEY AND GREAT LAKES REGION COUPLED WITH A NORTHWEST FLOW ALOFT MAY TRIGGER A COMPLEX OF SHOWERS OR THUNDERSTORMS NEXT WEEKEND. EXPECT TEMPERATURES FRIDAY AND THROUGH NEXT WEEKEND TO BE AT OR JUST ABOVE NORMAL AS THE UPPER LEVEL TROUGH AND ITS COOL POOL FOCUS JUST TO OUR EAST TO ALLOW HEAT FROM THE CENTRAL PLAINS TO EDGE OUR WAY. && .AVIATION /20Z SUNDAY THROUGH FRIDAY/... QUIET WEATHER ATTM WITH VFR CU INDICATED ACROSS MUCH THE FORECAST AREA PER VISIBLE IMAGERY...HOWEVER REGIONAL RADAR IMAGERY IS INDICATING DEVELOPMENT OF WIDESPREAD SHOWER ACTIVITY JUST UPSTREAM FROM AROUND KERI WEST. THIS ACTIVITY IS EXPECTED TO CONTINUE TO BLOSSOM AND TRACK EAST INTO WRN NY THIS AFTERNOON AND THIS EVENING. WHILE INSTABILITY AND THREAT FOR WIDESPREAD TSRA IS LIMITED...CANNOT RULE OUT AN ISOLATED THUNDERSTORM OR TWO AMONG THE WIDER SWATH OF SHOWERS. OVERALL HOWEVER EXPECT VFR CONDITIONS TO PREVAIL WITH BRIEF PERIODS OF MVFR IN HEAVIER SHOWERS. GIVEN RECENT TRENDS...ABUNDANT MOISTURE...AND LIKELIHOOD OF RAINFALL THIS EVENING...EXPECT CONDITIONS TO DETERIORATE TO AT LEAST MVFR OVERNIGHT WITH KJHW DROPPING TO IFR/LIFR AS USUAL. WITH UPPER LEVEL TROUGH APPROACHING...AM NOT EXPECTING WIDESPREAD FOG...HOWEVER...CANNOT RULE OUT THE POSSIBILITY OF IFR CIGS DEVELOPING ACROSS THE NIAGARA FRONTIER LATE TONIGHT/EARLY MON MORNING...HOWEVER CONFIDENCE IS NOT QUITE HIGH ENOUGH YET TO WARRANT DROPPING THE TAFS TO IFR AT THIS POINT. ANOTHER ROUND OF SHOWERS AND MVFR CONDITIONS WILL BE POSSIBLE FROM LATE MORNING ONWARDS ON MONDAY AS A POTENT UPPER LEVEL TROUGH AND SURFACE COLD FRONT APPROACH THE REGION. THE FRONT IS EXPECTED TO CROSS THE FORECAST AREA MONDAY NIGHT HOWEVER EXPECT AT LEAST A FEW SHOWERS TO HANG AROUND INTO TUESDAY AS THE UPPER LEVEL TROUGH CROSSES THE REGION. OUTLOOK... MONDAY NIGHT...MAINLY VFR WITH SHOWERS DIMINISHING. TUESDAY...MAINLY VFR WITH A CHANCE OF A FEW SHOWERS. WEDNESDAY...VFR. WEDNESDAY NIGHT AND THURSDAY...MAINLY VFR WITH A SLIGHT CHANCE OF FRIDAY...VFR. && .MARINE... WINDS/WAVES WILL REMAIN RELATIVELY LIGHT ON THE LAKES TONIGHT DUE TO A BROAD AREA OF LOW PRESSURE AND A WEAK GRADIENT ACROSS THE REGION. HOWEVER...SHOWERS AND ISOLATED THUNDERSTORMS WILL BE AFFECTING THE REGION THROUGH MONDAY AS AN UPPER LEVEL TROUGH TRAVERSES THE GREAT LAKES. AN ASSOCIATED COLD FRONT WILL CROSS THE LOWER GREAT LAKES MONDAY NIGHT AND SMALL CRAFT ADVISORIES MAY BE NECESSARY AS COLDER AIR MOVES ACROSS THE LAKES IN THE WAKE OF THE FRONT. THE BREEZY CONDITIONS WILL BE SHORT-LIVED HOWEVER AS HIGH PRESSURE WILL THEN BUILD ACROSS THE GREAT LAKES FROM TUESDAY NIGHT THROUGH THE REMAINDER OF THE WEEK. && .BUF WATCHES/WARNINGS/ADVISORIES... NY...NONE. MARINE...NONE. && SYNOPSIS...WOOD NEAR TERM...WOOD SHORT TERM...THOMAS LONG TERM...THOMAS AVIATION...WOOD MARINE...WOOD
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BUFFALO NY 509 AM EDT SUN SEP 1 2013 NYZ001>008-010>014-019>021-085-020915- NIAGARA-ORLEANS-MONROE-WAYNE-NORTHERN CAYUGA-OSWEGO-JEFFERSON-LEWIS- NORTHERN ERIE-GENESEE-WYOMING-LIVINGSTON-ONTARIO-CHAUTAUQUA- CATTARAUGUS-ALLEGANY-SOUTHERN ERIE- 509 AM EDT SUN SEP 1 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND NORTH CENTRAL NEW YORK. .DAY ONE...TODAY AND TONIGHT. THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. A COLD FRONT WILL CROSS THE REGION ON MONDAY ALONG WITH SOME SHOWERS AND THUNDERSTORMS. WHILE WIDESPREAD SEVERE WEATHER IS NOT ANTICIPATED...A FEW ISOLATED STRONGER STORMS WITH GUSTY WINDS WILL BE POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. THIS PRODUCT...ALONG WITH OTHER WATCHES...WARNINGS...ADVISORIES... AND STATEMENTS ISSUED BY THE NATIONAL WEATHER SERVICE OFFICE IN BUFFALO CAN BE FOUND ON THE INTERNET AT HTTP://WWW.WEATHER.GOV/BUF LEZ020-040-041-LOZ030-042>045-062>065-SLZ022-024-020915- UPPER NIAGARA RIVER AND BUFFALO HARBOR- LAKE ERIE NEARSHORE WATERS FROM RIPLEY TO DUNKIRK- LAKE ERIE NEARSHORE WATERS FROM DUNKIRK TO BUFFALO- LOWER NIAGARA RIVER- LAKE ONTARIO NEARSHORE WATERS FROM THE NIAGARA RIVER TO HAMLIN BEACH- LAKE ONTARIO NEARSHORE WATERS FROM HAMLIN BEACH TO SODUS BAY- LAKE ONTARIO NEARSHORE WATERS FROM SODUS BAY TO MEXICO BAY- LAKE ONTARIO NEARSHORE WATERS FROM MEXICO BAY TO THE SAINT LAWRENCE RIVER- LAKE ONTARIO OPEN WATERS FROM THE NIAGARA RIVER TO HAMLIN BEACH- LAKE ONTARIO OPEN WATERS FROM HAMLIN BEACH TO SODUS BAY- LAKE ONTARIO OPEN WATERS FROM SODUS BAY TO MEXICO BAY- LAKE ONTARIO OPEN WATERS FROM MEXICO BAY TO THE SAINT LAWRENCE RIVER- SAINT LAWRENCE RIVER FROM CAPE VINCENT TO OGDENSBURG- SAINT LAWRENCE RIVER FROM OGDENSBURG TO SAINT REGIS- 509 AM EDT SUN SEP 1 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE NEW YORK WATERS OF LAKE ERIE...LAKE ONTARIO...AND THE SAINT LAWRENCE RIVER. .DAY ONE...TODAY AND TONIGHT. THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. A COLD FRONT WILL CROSS THE REGION ON MONDAY ALONG WITH SOME SHOWERS AND THUNDERSTORMS. WHILE WIDESPREAD SEVERE WEATHER IS NOT ANTICIPATED...A FEW ISOLATED STRONGER STORMS WITH SOME GUSTY WINDS WILL BE POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. THIS PRODUCT...ALONG WITH OTHER WATCHES...WARNINGS...ADVISORIES... AND STATEMENTS ISSUED BY THE NATIONAL WEATHER SERVICE OFFICE IN BUFFALO CAN BE FOUND ON THE INTERNET AT HTTP://WWW.WEATHER.GOV/BUF JJR
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BUFFALO NY 438 PM EDT SUN SEP 1 2013 NYZ001-010-011-012130- ERIE NY-GENESEE NY-NIAGARA NY- 438 PM EDT SUN SEP 1 2013 ...A THUNDERSTORM WILL BRING VERY HEAVY RAIN FROM CLARENCE CENTER TO AKRON... * AT 432 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM CAPABLE OF PRODUCING VERY HEAVY RAIN. THIS STORM WAS LOCATED NEAR CLARENCE...AND WAS MOVING SLOWLY TO THE NORTHEAST AT 10 MPH. EXPECT VERY HEAVY RAINFALL...WITH LOCALIZED RAINFALL AMOUNTS OF AN INCH FROM CLARENCE CENTER TO AKRON...ALONG AND JUST NORTH OF INTERSTATE 90. THIS STORM HAS THE POTENTIAL TO PRODUCE VERY HEAVY RAIN...AND COULD CAUSE LOCALIZED FLOODING OF ROADS AND POOR DRAINAGE AREAS. LAT...LON 4313 7840 4300 7832 4290 7858 4304 7871 APFFEL
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
532 PM EDT SUN SEP 1 2013
NYZ002-011-012215-
GENESEE NY-ORLEANS NY-
532 PM EDT SUN SEP 1 2013
...A STRONG THUNDERSTORM WILL BRING HEAVY RAINS TO NORTHERN PORTIONS
OF GENESEE AND SOUTHERN PORTIONS OF ORLEANS COUNTY...
* AT 527 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
CLUSTER OF STRONG THUNDERSTORMS PRODUCING VERY HEAVY RAINFALL IN
EXCESS OF AN INCH AN HOUR. THESE STORMS WILL BRING HEAVY RAIN TO
MEDINA...ALBION..OAKFIELD...EAST PEMBROKE...AND NEARBY LOCATIONS.
THIS STORM HAS THE POTENTIAL TO PRODUCE VERY HEAVY RAIN...AND COULD
CAUSE LOCALIZED FLOODING OF ROADS AND POOR DRAINAGE AREAS.
LAT...LON 4325 7807 4306 7806 4300 7818 4299 7846
4326 7846
APFFELSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BUFFALO NY 604 PM EDT SUN SEP 1 2013 NYZ003-011-013-012300- GENESEE NY-LIVINGSTON NY-MONROE NY- 604 PM EDT SUN SEP 1 2013 ...STRONG THUNDERSTORM MOVING INTO THE AREA... * AT 602 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM CAPABLE OF PRODUCING SMALL HAIL...STRONG GUSTY WINDS...AND VERY HEAVY RAIN. THIS STORM WAS LOCATED NEAR BATAVIA...AND MOVING EAST AT 15 MPH. * SOME LOCATIONS AFFECTED BY THE STRONG THUNDERSTORM MAY INCLUDE... BYRON... LE ROY... BERGEN... MUMFORD AND CALEDONIA... SCOTTSVILLE AND INDUSTRY... THIS STORM HAS THE POTENTIAL TO BECOME SEVERE AND PRODUCE LARGE HAIL AND/OR DAMAGING WINDS. FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY! THIS STORM HAS THE POTENTIAL TO PRODUCE VERY HEAVY RAIN...AND COULD CAUSE LOCALIZED FLOODING OF ROADS AND POOR DRAINAGE AREAS. LAT...LON 4311 7757 4284 7759 4291 7821 4309 7820 JAM
The Buffalo radar (KBUF), 98 km away, was scanning. The volume nearest the first event began at 22:25 UTC.
3 thunderstorm wind. Local standard time, as filed.
Law enforcement reported trees and wires down.
Law enforcement reported trees and wires down.
Law enforcement reported trees and wires down.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New York in 2013Every state in 2013This day in weather historyWarnings in New York, September 2013
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: 478866, 478867, 478868.