An upper level low pressure system remained nearly stationary over the Ohio Valley. Weak forcing associated with this feature coupled with deep southeasterly flow off the Atlantic Ocean to provide the area with persistent showers and scattered thunderstorms.
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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 BGM wrote it up.
An upper level low pressure system remained nearly stationary over the Ohio Valley. Weak forcing associated with this feature coupled with deep southeasterly flow off the Atlantic Ocean to provide the area with persistent showers and scattered thunderstorms. Locally heavy rainfall concentrated over portions of Steuben county causing some streams and creeks to exceed their banks and impact area roads.
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 May 5, 5:49 PM EST, 45 minutes earlier.
Area Forecast Discussion National Weather Service Binghamton NY 649 PM EDT Mon May 5 2025 .SYNOPSIS... An upper level low will remain in place through Wednesday with frequent rain showers, clouds, and cooler temperatures. A cold front on Thursday will be followed by yet another upper level low to end the work week with additional periods of rain. High pressure and a drier weather pattern is expected to finally arrive by the end of the upcoming weekend. && .NEAR TERM /THROUGH TUESDAY NIGHT/... 225 PM Update Mostly cloudy skies out there this afternoon will persist into the evening hours. A few rounds of rain and showers will overspread the area heading into the evening and overnight hours. Instability is increasing across the western portion of the forecast area, with several hundred Joules of MLCAPE observed west of I-81, and LIs down to around -1. This could be just enough instability for some isolated to scattered thunderstorms to develop across the Central Southern Tier, Finger Lakes and/or the Wyoming Valley between now and around sunset. Otherwise, and area of moderate to locally heavier rainfall will rotate into the eastern half of the CWA from the Lower Hudson Valley region by late afternoon and evening. Another round of rain is expected to move into the Catskills and Mohawk Valley region after midnight with additional rainfall. The rain coming in off the Atlantic associated with a strong southeasterly low level jet is not expected to have much instability to work with; therefore rainfall rates are not forecast to be overly excessive. With that said, if any stronger convective showers or t'storms were to develop in this area there could be isolated flash flooding issues...considering the recent rain and wet soil antecedent conditions here. Decided to hold off on any flood watches at this time, but will continue to monitor regional radar and CAMs trends closely in the coming hours. Outside of the moderate to locally heavy rainfall tonight, there will be patchy fog, mostly cloudy and mild conditions with lows in the 50s once again. Tuesday will feature increasing shower and thunderstorm chances through the day as the upper level low approaches from the west. Deeper mid and upper level moisture wanes a bit, but this allows for more instability as temperatures reach the upper 60s to mid-70s over the area, along with dew points in the upper 50s to low 60s. MLCAPE is forecast to reach 500-1000 J/kg, especially where breaks in the clouds allow for some sunshine and more boundary layer heating. LIs may reach -3 to -5 and deep layer 0-6km wind shear increases to around 50 kts in the afternoon. With PWATs still hovering above 1" there could also be localize heavy downpours and isolated excessive rainfall issues. SPC does have most of our CWA under a Marginal Risk for severe storms as well, with the main threats being isolated damaging winds and hail. The mid and upper level low moves directly overhead Tuesday night, with additional showers expected. It will be slightly cooler with overnight lows in the upper 40s to mid-50s. && .SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/... 410 PM Update: By Wednesday, the upper low will finally transition to more of an open wave and start to kick out to the east. Showers and perhaps a few thunderstorms are still expected on Wednesday on the backside of the low pressure system, especially east of I-81 and during the afternoon, but overall intensity is expected to be less compared to Tuesday. Highs on Wednesday are expected to be in the mid 60s to near 70. Conditions start to dry out Wednesday night behind the passage of a cold front, but a few lingering light showers will still be possible. Thursday will be a cooler day behind the cold front with highs in the mid 50s to mid 60s. Thursday will be a mainly dry day, but another trough moving into the area may result in a few isolated showers in the late afternoon and evening. Then Thursday night, a coastal low pressure system is expected to start to develop, which will start to advect more moisture in the area, especially across the Poconos-Catskills. As a result, coverage of showers are expected to increase late in the night and especially into Friday. && .LONG TERM /FRIDAY THROUGH MONDAY/... 410 PM Update: Confidence continues to increase in seeing widespread rainfall once again on Friday through Friday night, and potentially even into Saturday as a coastal low pressure system will likely track along the Mid-Atlantic/New England coast. The one area of uncertainty is how far east this system tracks, which introduces some uncertainty regarding how far west the steadier rainfall gets. With this update, significantly bumped up PoPs, especially for areas east of I-81. PoPs were raised a bit higher than the NBM as well. High pressure then finally works its way into the area just in time for Mother's Day, which will finally bring dry weather to the area. && .AVIATION /00Z TUESDAY THROUGH SATURDAY/... Mostly MVFR to MVFR fuel alternate conditions are expected to continue through this evening. Showers will become more widespread, with some IFR restrictions possible at AVP, BGM and ELM tonight. Elsewhere the increasing ESE winds should help to keep conditions mainly above IFR levels. Fog will not be as prevalent tonight, with low level east winds remaining elevated around 5 - 10 kts overnight; although there could still be pockets of MVFR mist around. Fog will develop across the east facing slopes of the Poconos and Catskills, away from our TAF sites. CIGs gradually lift and may even scatter out late Tuesday morning and afternoon. However, additional scattered to numerous showers and thunderstorms will develop across the area heading into Tuesday afternoon with renewed restrictions likely, but confidence is too low at this time to add thunderstorms at any one location. Outlook... Tuesday afternoon...Rain showers and scattered thunderstorms expected with associated restrictions. Wednesday and Thursday...Scattered showers and isolated thunderstorms will still be around the area under an upper level low pressure system. Restrictions possible. Confidence moderate to high. Friday...Rain showers likely with additional restrictions possible. Confidence moderate. Saturday...A chance for lingering rain showers, and occasional restrictions. Confidence low. && .BGM WATCHES/WARNINGS/ADVISORIES... PA...None. NY...None. && SYNOPSIS...MJM NEAR TERM...MJM SHORT TERM...BJG LONG TERM...BJG AVIATION...MPK/MJM
Hazardous Weather Outlook National Weather Service Binghamton NY 416 PM EDT Mon May 5 2025 NYZ009-015>018-022>025-036-037-044>046-055-056-PAZ038-039-043-044- 047-062030- Northern Oneida-Yates-Seneca-Southern Cayuga-Onondaga-Steuben- Schuyler-Chemung-Tompkins-Madison-Southern Oneida-Cortland-Chenango- Otsego-Tioga-Broome-Bradford-Susquehanna-Wyoming-Lackawanna-Luzerne- 416 PM EDT Mon May 5 2025 This Hazardous Weather Outlook is for central New York and northeast Pennsylvania. .DAY ONE...Tonight. Hazardous weather is not expected at this time. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Scattered showers and thunderstorms are expected on Tuesday. A few thunderstorms may become strong to severe. The main hazards are expected to be isolated damaging winds, hail and locally heavy downpours. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. Please relay any information about severe weather to the NWS. NYZ057-062-PAZ040-048-072-062030- Delaware-Sullivan-Northern Wayne-Pike-Southern Wayne- 416 PM EDT Mon May 5 2025 This Hazardous Weather Outlook is for central New York and northeast Pennsylvania. .DAY ONE...Tonight. Showers and scattered thunderstorms may produce locally heavy rainfall this evening and tonight. There is a slight risk for excessive rainfall and isolated flash flooding may occur if any storms track over the same location. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Scattered showers and thunderstorms are expected on Tuesday. A few thunderstorms may become strong to severe. The main hazards are expected to be isolated damaging winds, hail and locally heavy downpours. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. Please relay any information about severe weather to the NWS.
Preliminary Local Storm Report
National Weather Service Binghamton NY
150 PM EDT Mon May 5 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0800 AM Rain 7 ESE Hancock 41.91N 75.16W
05/05/2025 M2.55 Inch Delaware NY Emergency Mngr
&&Preliminary Local Storm Report
National Weather Service Binghamton NY
734 PM EDT Mon May 5 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0734 PM Flash Flood Canisteo 42.27N 77.61W
05/05/2025 Steuben NY Emergency Mngr
State Route 36 and State Route 248 closed
due to water over roadway.
&&The Buffalo radar (KBUF), 119 km away, was scanning. The volume nearest the first event began at 23:36 UTC.
5 flash flood. Local standard time, as filed.
Flash flooding closed State Route 36 and 248 with water flowing over portions of these roads near Canisteo.
County Route 68 at Honey Run Road was closed due to water over roadway.
State Route 248 was closed near Sugar Creek due to flooding on the roadway.
Banks Hollow Road was closed due to water over roadway.
Slate Creek Road was closed due to water over bridge impacting the roadway.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New York in 2025Every state in 2025This day in weather historyWarnings in New York, May 2025
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: 1265512, 1265528, 1265540, 1265541, 1265547.