Alert archive / New York / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 114, NWS Buffalo, NY
NWS Buffalo, NY issued this severe thunderstorm warning at Sep 2, 2026, 10:17 PM EDT for Allegany County, New York. It was in force for 43 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 2, 2026, 10:17 PM EDT (02:17 UTC)
- Expired
- Sep 2, 2026, 11:00 PM EDT
- In force
- 43 min
- Issued by
- NWS Buffalo, NY
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Allegany County, NY
The radar
The Buffalo radar (KBUF), 105 km from the middle of the area, began a volume at 02:20 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 2, 10:31 PM EDT | TSTM WND DMG | Wellsville, NY | Several trees uprooted along Stevens Street. Time estimated from radar. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 14 minutes after it went out.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 2, 4:41 PM EDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 00:00Z, 2.3 hours before the alert went out and 260 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 2581 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 1375 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 107 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 7.5
The text
As transmitted.
140
WUUS51 KBUF 030217
SVRBUF
NYC003-030300-
/O.NEW.KBUF.SV.W.0114.260903T0217Z-260903T0300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
1017 PM EDT Wed Sep 2 2026
The National Weather Service in Buffalo has issued a
* Severe Thunderstorm Warning for...
Allegany County in western New York...
* Until 1100 PM EDT.
* At 1017 PM EDT, a severe thunderstorm was located 8 miles northwest
of Wellsville, moving east at 50 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Wellsville, Alfred, Belfast, Whitesville, Friendship, Scio,
Bolivar, Andover, Belmont, and Angelica.
This includes Interstate 86 between exits 29 and 33.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail, damaging wind, and continuous cloud to ground lightning
are occurring with this storm. Move indoors immediately. Lightning is
one of nature's leading killers. Remember, if you can hear thunder,
you are close enough to be struck by lightning.
&&
LAT...LON 4200 7824 4234 7819 4244 7773 4200 7775
TIME...MOT...LOC 0217Z 275DEG 43KT 4219 7807
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Thomas2 follow-up statements
490
WWUS51 KBUF 030244
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
1044 PM EDT Wed Sep 2 2026
NYC003-030300-
/O.CON.KBUF.SV.W.0114.000000T0000Z-260903T0300Z/
Allegany NY-
1044 PM EDT Wed Sep 2 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT
FOR SOUTHERN ALLEGANY COUNTY...
At 1043 PM EDT, a severe thunderstorm was located near Whitesville,
or 9 miles east of Wellsville, moving east at 45 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Wellsville, Alfred, Whitesville, Friendship, Scio, Bolivar, Andover,
Belmont, Alma, and Richburg.
This includes Interstate 86 near exit 29.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4200 7824 4222 7819 4228 7774 4200 7775
TIME...MOT...LOC 0243Z 281DEG 37KT 4210 7777
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Thomas918 WWUS51 KBUF 030300 SVSBUF Severe Weather Statement National Weather Service Buffalo NY 1100 PM EDT Wed Sep 2 2026 NYC003-030310- /O.EXP.KBUF.SV.W.0114.000000T0000Z-260903T0300Z/ Allegany NY- 1100 PM EDT Wed Sep 2 2026 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN ALLEGANY COUNTY HAS EXPIRED... The storm which prompted the warning has weakened below severe limits, and no longer poses an immediate threat to life or property. Therefore, the warning has been allowed to expire. && LAT...LON 4200 7824 4222 7819 4228 7774 4200 7775 TIME...MOT...LOC 0300Z 275DEG 43KT 4208 7749 $$ Thomas
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at Sep 2, 7:37 PM EDT, 2 hours 40 minutes earlier. Its key messages:
- 1) Periodic showers and thunderstorms are expected through Thursday. Some storms will be severe later this afternoon and evening. 2) Quieter weather, overall, expected Thursday night through Saturday.
Area forecast discussion, Sep 2, 7:37 PM EDT, 2 hours 40 minutes before
Area Forecast Discussion National Weather Service Buffalo NY 737 PM EDT Wed Sep 2 2026 .WHAT HAS CHANGED... The SPC now has our entire forecast area in a slight to enhanced risk of severe thunderstorms this afternoon into tonight. The greatest risk for severe thunderstorms exists in Western NY and the Finger Lakes. The likeliest window for severe storms appears to be from 4 PM to 11 PM EDT this evening. Please see discussion below for further details. && .KEY MESSAGES... 1) Periodic showers and thunderstorms are expected through Thursday. Some storms will be severe later this afternoon and evening. 2) Quieter weather, overall, expected Thursday night through Saturday. && .DISCUSSION... KEY MESSAGE 1...Periodic showers and thunderstorms are expected through Thursday. Some storms will be severe later this afternoon and evening. W'erly to WNW'erly mid/upper-level flow near 40 to 60 knots and embedded shortwave disturbances affect our region through Thursday. At the surface, our CWA resides within a warm and very humid sector originating over the Gulf before a cold front sweeps E'ward through Western and Central NY between about 2 AM and 9 AM EDT Thursday morning. This warm and very humid air mass will contribute to periods of heavy rainfall with showers and storms (more details below). Behind the cold front, an extensive high pressure ridge associated with a cooler and drier air mass begins to build from northern ON and vicinity. High temperatures are expected to reach mainly the mid 70's to mid 80's this afternoon and be followed by overnight lows in the 60's around daybreak Thursday. Highs should reach the 70's to 80F late Thursday afternoon. As of 2:50 PM EDT, a broken line of showers and thunderstorms, including supercells, had already developed over southern ON, along a pre-front surface trough axis. Periodic and organized showers and thunderstorms amidst moderate to strong deep-layer bulk shear are expected today through Thursday as at least weak to moderate CAPE, including elevated CAPE, is released by the following: moist isentropic ascent ahead of shortwave trough axes; low-level convergence/moist ascent along surface trough axes attendant to the shortwave troughs and along the cold front; downshear outflow boundaries interacting favorably with ambient low-level vertical wind shear. Of greatest concern is the aforementioned storms that have developed over southern ON. These storms are expected to grow upscale into a QLCS consisting of multicells, including bowing segments, and supercells as the storms persist generally ESE'ward and impact our CWA late this afternoon, and especially this evening, and encounter a pre- storm environment that includes moderate to strong boundary layer CAPE. Strong to damaging straight-line wind gusts are expected as the storms encounter steep low-level lapse rates and moderate to strong DCAPE stemming from diurnal convective mixing of the boundary layer through this late afternoon and then limited nocturnal cooling in the warm/moist sector boundary layer this evening into tonight. Sporadic severe hail is possible due to mid-level lapse rates near 7C/km contributing to large MUCAPE in the hail growth zone, but rich low-level moisture contributing to unfavorably-high ambient atmospheric melting levels near 11kft AGL should curb the severe hail threat, at least somewhat. A few tornadoes are possible with mesocyclones and mesovortices, and a strong tornado cannot be ruled out since low-level winds veering and strengthening significantly with height should yield surface-based ESRH near 150-300 m2/s2 amidst favorably-low mixed layer LCL's. Localized flash flooding is possible through tonight, especially where showers and storms manage to train along any outflow boundaries that manage to become oriented largely parallel to the W'erly to WNW'erly mean mid-level flow. KEY MESSAGE 2...Quieter weather, overall, expected Thursday night through Saturday. The surface high pressure ridge continues to build from northern ON, and vicinity and humidity at the surface and aloft continues to decrease gradually, Thursday night through Saturday. However, northwesterly flow aloft and embedded shortwave troughs will continue to impact our region through Friday before the ridge aloft begins to build from the west Friday night through Saturday. Moist isentropic ascent ahead of the shortwave trough axes and low-level convergence/moist ascent along surface trough axes attendant to the shortwaves may release weak, yet sufficient instability, including elevated CAPE, to generate isolated showers and thunderstorms Thursday night through Friday. Current odds favor fair weather Friday night through Saturday due to stabilizing subsidence accompanying the ridge at the surface and aloft. Lows should reach the mid 50's to mid 60's around daybreak Friday and mainly the upper 40's to near 60F around daybreak Saturday as the cooler air mass associated with the ridge continues to overspread Western and Central NY. Late afternoon highs should reach the 70's on Friday and the mid 60's to mid 70's on Saturday. Note: partial clearing, the cooler air mass, lingering low-level moisture, and weak surface winds should yield steam fog in the river and lake valleys east of Lake Ontario, in the Finger Lakes, and in the Western Southern Tier around daybreak Friday and Saturday, respectively. && .AVIATION /00Z THURSDAY THROUGH MONDAY/... A line of strong to severe thunderstorms has just passed to the SE of a KBUF to KROC line with strong NW gusts as it does. Cigs in heavy rain and thunder are generally dropping to MVFR while visibilities get closer to IFR with the activity. Indications are that there is rotation in this line, so aviation concerns would be wise to avoid this as is drops SE over the next 3-4 hours. Elsewhere, more scattered activity should affect KJWH and KART over the next few hours, however it will be nowhere near as strong as the other sites. Scattered showers and thunderstorms will remain around even behind the line of stronger weather through the remainder of the evening. With a humid air mass in place and weaker low level flow overnight, expect IFR cigs and localized fog to become common, especially around KJWH. This will take some time to mix out after sunrise, but eventually most areas should return to VFR on Thursday. Outlook... Friday and Monday...Mainly VFR. River valley fog with local IFR each late night and early morning across the Southern Tier. && .MARINE... S'erly to SW'erly winds up to 10 to 15 knots are expected on Lakes Erie and Ontario before a cold front sweeps E'ward across the lakes overnight tonight through about mid-morning on Thursday. The front will be followed by a high pressure ridge building from northern Ontario and vicinity. Behind the front, W'erly to NW'erly winds around 10 to 15 knots and waves of 3 feet or less are expected through Friday. Light and variable winds and waves remaining 3 feet or less are expected this Friday night through Monday as the aforementioned ridge continues to build into our region. There will be a chance of thunderstorms at times through Thursday. Thunderstorm chances will peak late Wednesday afternoon through the first half of Wednesday night. Some of these storms may produce strong winds, hail, and locally higher waves. && .BUF WATCHES/WARNINGS/ADVISORIES... NY...None. MARINE...None. && DISCUSSION...Jaszka AVIATION...Fries MARINE...Jaszka
Hazardous weather outlook, Sep 2, 4:43 PM EDT, 5 hours 34 minutes before
Hazardous Weather Outlook National Weather Service Buffalo NY 443 PM EDT Wed Sep 2 2026 NYZ001>008-010>014-019>021-085-032045- Niagara-Orleans-Monroe-Wayne-Northern Cayuga-Oswego-Jefferson-Lewis- Northern Erie-Genesee-Wyoming-Livingston-Ontario-Chautauqua- Cattaraugus-Allegany-Southern Erie- 443 PM EDT Wed Sep 2 2026 ...TORNADO WATCH 645 IN EFFECT UNTIL 11 PM EDT THIS EVENING... This Hazardous Weather Outlook is for western and north central New York. .DAY ONE...Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Tornado Watch. Several rounds of showers and thunderstorms with periods of heavy rainfall are expected today through tonight. Some storms may be severe with damaging wind gusts and hail, respectively. A tornado or two and localized flash flooding are possible. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Hazardous weather is not expected at this time. .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>065-032045- 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- 443 PM EDT Wed Sep 2 2026 ...TORNADO WATCH 645 IN EFFECT UNTIL 11 PM EDT THIS EVENING... This Hazardous Weather Outlook is for portions of Lake Erie and Lake Ontario. .DAY ONE...Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Tornado Watch. Several rounds of showers and thunderstorms with periods of heavy rainfall are expected today through tonight. Some storms may be severe with damaging wind gusts and hail, respectively. A waterspout or two are possible. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Hazardous weather is not expected at this time. .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 SLZ022-024-032045- Saint Lawrence River from Cape Vincent to Ogdensburg- Saint Lawrence River from Ogdensburg to Saint Regis- 443 PM EDT Wed Sep 2 2026 This Hazardous Weather Outlook is for the New York waters of the Saint Lawrence River. .DAY ONE...Tonight. Several rounds of showers and thunderstorms with periods of heavy rainfall are expected today through tonight. Some storms may be severe with damaging wind gusts and hail, respectively. A waterspout or two are possible. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Hazardous weather is not expected at this time. .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
In the hours before
Local storm report, Sep 2, 8:22 PM EDT, 1 hour 55 minutes before
Preliminary Local Storm Report
National Weather Service Buffalo NY
822 PM EDT Wed Sep 2 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0722 PM Tstm Wnd Gst 3 NE Irondequoit 43.24N 77.53W
09/02/2026 M54 MPH LOZ043 NY Mesonet
Mesonet station XIQB Irondequoit Bay.
&&
EALLocal storm report, Sep 2, 8:23 PM EDT, 1 hour 54 minutes before
Preliminary Local Storm Report
National Weather Service Buffalo NY
823 PM EDT Wed Sep 2 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0800 PM Flash Flood Albion 43.24N 78.19W
09/02/2026 Orleans NY Emergency Mngr
Road closed due to water over roadway.
&&Local storm report, Sep 2, 8:32 PM EDT, 1 hour 45 minutes before
Preliminary Local Storm Report
National Weather Service Buffalo NY
832 PM EDT Wed Sep 2 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0715 PM Tstm Wnd Dmg 1 NNW Corfu 42.97N 78.41W
09/02/2026 Genesee NY 911 Call Center
Tree down blocking roadway and closing road.
0629 PM Tstm Wnd Dmg 3 S Waterport 43.28N 78.26W
09/02/2026 Orleans NY 911 Call Center
Tree down blocking half of roadway.
&&Local storm report, Sep 2, 8:52 PM EDT, 1 hour 25 minutes before
Preliminary Local Storm Report
National Weather Service Buffalo NY
852 PM EDT Wed Sep 2 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0805 PM Hail 3 ESE Freedom 42.48N 78.33W
09/02/2026 M1.00 Inch Cattaraugus NY Public
&&Local storm report, Sep 2, 9:14 PM EDT, 1 hour 3 minutes before
Preliminary Local Storm Report
National Weather Service Buffalo NY
914 PM EDT Wed Sep 2 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0851 PM Tstm Wnd Gst 2 SW Wellsville 42.10N 77.98W
09/02/2026 M59 MPH Allegany NY ASOS
ASOS station KELZ Wellsville Airport.
&&
EALLocal storm report, Sep 2, 10:05 PM EDT, 12 minutes before
Preliminary Local Storm Report
National Weather Service Buffalo NY
1005 PM EDT Wed Sep 2 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0820 PM Tstm Wnd Dmg Naples 42.61N 77.40W
09/02/2026 Ontario NY 911 Call Center
Multiple reports of trees and wires down
blocking the roadways across the town.
0817 PM Tstm Wnd Dmg Geneva 42.87N 76.99W
09/02/2026 Ontario NY 911 Call Center
Multiple reports of trees and wires down
blocking the roadways across the town.
0810 PM Tstm Wnd Dmg 2 N Seneca Castle 42.92N 77.11W
09/02/2026 Ontario NY Public
2 trees down blocking the roadway.
0810 PM Tstm Wnd Dmg 4 SSE Shortsville 42.90N 77.19W
09/02/2026 Ontario NY 911 Call Center
Multiple reports of trees and wires down
blocking the roadways across the town.
0810 PM Tstm Wnd Dmg 2 ENE Canandaigua 42.90N 77.25W
09/02/2026 Ontario NY 911 Call Center
Tree and wires down on a garage. Time
estimated by radar.
0807 PM Tstm Wnd Dmg Manchester 42.97N 77.23W
09/02/2026 Ontario NY 911 Call Center
Multiple reports of trees and wires down
blocking the roadways across the town.
0802 PM Tstm Wnd Dmg 4 E Victor 42.99N 77.33W
09/02/2026 Ontario NY 911 Call Center
Multiple reports of trees and wires down
blocking the roadways across the town.
0751 PM Tstm Wnd Dmg 2 SSW Pittsford 43.06N 77.53W
09/02/2026 Monroe NY Trained Spotter
Large tree down,.
0743 PM Tstm Wnd Dmg Springville 42.51N 78.67W
09/02/2026 Erie NY Public
Tree down. Time estimated by radar.
0730 PM Tstm Wnd Dmg 3 ENE Colden 42.67N 78.63W
09/02/2026 Erie NY Trained Spotter
Tree down.
&&The office that day
Everything else NWS Buffalo, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 2, 8:07 PM EDT | Special Marine Warning | BUF | 53 min | |
| Sep 2, 8:13 PM EDT | Special Marine Warning | BUF | 47 min | |
| Sep 2, 8:46 PM EDT | Flash Flood Warning | BUF | Allegany, Cattaraugus | 4 hr |
| Sep 2, 8:55 PM EDT | Special Marine Warning | BUF | 95 min | |
| Sep 2, 8:59 PM EDT | Severe Thunderstorm Warning | BUF | Jefferson | 63 min |
| Sep 2, 9:04 PM EDT | Special Marine Warning | BUF | 56 min | |
| Sep 2, 9:09 PM EDT | Severe Thunderstorm Warning | BUF | Allegany, Cattaraugus | 36 min |
| Sep 2, 9:50 PM EDT | Areal Flood Warning | BUF | Monroe | 14 hr |
| Sep 2, 10:00 PM EDT | Special Marine Warning | BUF | 90 min | |
| Sep 2, 10:00 PM EDT | Severe Thunderstorm Warning | BUF | Cattaraugus, Chautauqua | 75 min |
| Sep 2, 11:23 PM EDT | Areal Flood Warning | BUF | Orleans | 10 hr |
| Sep 3, 7:27 PM EDT | Flash Flood Warning | BUF | Erie | 4 hr |
Nearby
Severe Thunderstorm Warnings in New York, 2026Every severe thunderstorm warning in 2026
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.