An upper level low pressure system interacting with a stationary frontal system draped across southeast New York triggered copious amounts of showers and thunderstorms. An enhanced area of prolonged heavy rainfall over Delaware county produced a period of excessive runoff and some flash flooding of local roads.
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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 interacting with a stationary frontal system draped across southeast New York triggered copious amounts of showers and thunderstorms. An enhanced area of prolonged heavy rainfall over Delaware county produced a period of excessive runoff and some flash flooding of local 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 4, 2:28 PM EST, 3 hours 14 minutes earlier.
Area Forecast Discussion National Weather Service Binghamton NY 328 PM EDT Sun May 4 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 scattered showers around. The weather is expected to finally dry out by next weekend with seasonable temperatures as high pressure builds overhead. && .NEAR TERM /THROUGH MONDAY NIGHT/... 215 PM Update Unsettled, wet weather with periods of rain and embedded thunderstorms will continue through this forecast period as a slow moving upper level low gradually moves east toward the region. Another round of moderate to locally heavy rainfall and embedded t'storms is now moving north from the Mid-Atlantic into the area, and will persist into the evening hours. Rainfall amounts between a half to one inch are expected now through midnight. Otherwise, areas of fog and drizzle will continue outside of the steady rain. Will need to watch for locally excessive rainfall late this evening across the area as WPC maintains a marginal risk for excessive rainfall and isolated flash flooding through tonight over the entire area. The steady rain lifts north and east across the Catskills and Mohawk Valley region overnight into the predawn hours early Monday morning; the rain gradually weakens and tapers off to scattered showers or drizzle toward daybreak. There will again be areas of fog, some locally dense especially over the higher elevations. Current trends for Monday continue to show more in the way to isolated to scattered showers Monday morning; increasing in coverage to scattered or numerous Monday afternoon, along with a better chance for t'storms as temperatures are warmer than today; giving more instability. A corridor of 500-800 J/Kg of MLCAPE develops along and west of an Auburn--Binghamton and Scranton line. There will also be 20-25 kts of deep layer shear so a few thunderstorms are again expected, and some could produce locally heavy rainfall and/or gusty winds. Highs on Monday reach the mid-60s to lower 70s...about 5-8 degrees warmer than today, this is due to the potential for at least some partial breaks in the overcast from time to time. && .SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/... 325 PM Update: The upper level low west of our area that has been influencing our weather the last few days will speed up a bit and get much closer to our region during the day on Tuesday. With a stronger southerly flow advecting in moist Atlantic moisture, coverage of showers (and perhaps a few thunderstorms) will be more widespread on Tuesday, although right now it appears the heaviest rain will be east of our area/closer to the coast. PWATs are not necessarily impressive (generally around one inch), so widespread flooding is not expected at this time. Still cannot rule out some isolated flooding issues due to the wet pattern we are currently in. Coverage of showers diminishes somewhat Tuesday night with the loss of diurnal heating, but there will still be some showers around. By Wednesday, the upper low will finally transition to more of an open wave and start to kick out to the east. There will still be the potential for scattered showers and possibly a thunderstorm on the backside of the departing low, especially Wednesday afternoon and east of I-81), but overall coverage of showers is expected to be considerably less than the early week timeframe. && .LONG TERM /THURSDAY THROUGH SUNDAY/... 325 PM Update: While the long term period initially looked to feature a drying trend (which is still on the table), latest trends in the model guidance is hinting at a second upper level low dropping down into the region Thursday into Friday, which would actually result in an increasing chance of showers once again. In fact, some guidance such as the 12Z ECMWF keeps showers around all the way through Saturday, before drying out on Sunday. For now, opting to remain with the NBM PoPs due to the high degree of uncertainty, which resulted in slight chance to low-end chance PoPs for Thursday though the weekend. However, if the current trend continues, PoPs may need to be significantly increased with future forecast updates, especially for the Friday/Saturday timeframe. && .AVIATION /19Z SUNDAY THROUGH FRIDAY/... 220 PM Update Widespread MVFR Fuel Alternate to IFR restrictions continue this afternoon and evening with areas of fog (ITH/BGM) and periods of rain expected. Steady rain will overspread the area through this evening with vbsys generally between 2-5SM in the rain, and lower at times with the fog. There will be a chance for a thunderstorm or two, especially INVOF AVP where a tempo group was added until earl evening. A thunderstorm is also possible near BGM, but probabilities are lower, so did not add into the taf here at this time. CIGs do not improve much until Monday afternoon, when they are expected to come up to MVFR fuel alternate at most of our taf sites by 16-18z. Winds will be light and variable, turning more easterly and remaining light overnight into Monday morning. By Monday afternoon east winds increase between 8-15 kts with gusts around 20 kts expected. Outlook... Monday Afternoon through Tuesday...Rain showers and isolated thunderstorms each day 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. Friday...A few isolated to scattered showers are possible, with brief restrictions. && .BGM WATCHES/WARNINGS/ADVISORIES... PA...None. NY...None. && SYNOPSIS...MJM NEAR TERM...MJM SHORT TERM...BJG LONG TERM...BJG AVIATION...MJM
Hazardous Weather Outlook National Weather Service Binghamton NY 306 PM EDT Sun May 4 2025 NYZ009-015>018-036-037-051915- Northern Oneida-Yates-Seneca-Southern Cayuga-Onondaga-Madison- Southern Oneida- 306 PM EDT Sun May 4 2025 This Hazardous Weather Outlook is for central New York. .DAY ONE...This afternoon and tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Monday through Saturday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. NYZ022>025-044>046-055-051915- Steuben-Schuyler-Chemung-Tompkins-Cortland-Chenango-Otsego-Tioga- 306 PM EDT Sun May 4 2025 This Hazardous Weather Outlook is for central New York. .DAY ONE...This afternoon and tonight. Showers and scattered thunderstorms may produce locally heavy rainfall this evening into tonight. There is a marginal risk for excessive rainfall and isolated flash flooding may occur if any storms train over the same location. .DAYS TWO THROUGH SEVEN...Monday through Saturday. There is a low probability for widespread hazardous weather. .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. NYZ056-057-062-PAZ038>040-043-044-047-048-072-051915- Broome-Delaware-Sullivan-Bradford-Susquehanna-Northern Wayne-Wyoming- Lackawanna-Luzerne-Pike-Southern Wayne- 306 PM EDT Sun May 4 2025 This Hazardous Weather Outlook is for central New York and northeast Pennsylvania. .DAY ONE...This afternoon and tonight. Showers and scattered thunderstorms may produce locally heavy rainfall this evening and tonight. There is a marginal risk for excessive rainfall and isolated flash flooding may occur if any storms train over the same location. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Showers and scattered thunderstorms may produce locally heavy rainfall again on Monday. There is a marginal risk for excessive rainfall and isolated flash flooding may occur if any storms train over the same location. There is a low probability for widespread hazardous weather for the rest of the week through Saturday. .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
425 PM EDT Sun May 4 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0620 PM Tstm Wnd Dmg 1 N Monterey 42.31N 77.05W
05/02/2025 Schuyler NY NWS Storm Survey
NWS damage survey confirms a microburst near
Monterey with peak wind speeds of 85 mph.
Multiple properties damaged, including
collapse of wooden garage, major loss of a
metal and wooden barn, major loss of metal
roofing on another barn, and a hole from a
2-inch diameter branch that punctured
through two doors of a house. Multiple small
holes on siding of a house, from copious
amounts of wind-driven hail of at least one
inch in diameter. The focused microburst
ended around 6:22 PM EDT, though additional
pockets of damage continued to the east.
&&
MDPPreliminary Local Storm Report
National Weather Service Binghamton NY
437 PM EDT Sun May 4 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0640 PM Tstm Wnd Dmg Odessa 42.33N 76.81W
05/02/2025 Schuyler NY NWS Storm Survey
Several 1 to 2 foot diameter limbs down,
with small uproots, in Odessa area.
Radar-estimated time.
0645 PM Tstm Wnd Dmg 1 NNW Alpine 42.33N 76.73W
05/02/2025 Schuyler NY NWS Storm Survey
Numerous uprooted trees and some elevated
trunk snaps. One large tree fell through a
barn roof and wall. Radar-estimated time.
&&The Binghamton radar (KBGM), 72 km away, was scanning. The volume nearest the first event began at 22:43 UTC.
1 flash flood. Local standard time, as filed.
Flooding from East Brook was affecting county road CR-22.
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: 1265505.