Alert archive / New York / Flash Flood Warnings in 2026

Flash Flood Warning 19, NWS Buffalo, NY

September 3, 2026Erie County, Livingston County, Wyoming County, New York

NWS Buffalo, NY issued this flash flood warning at Sep 3, 2026, 10:13 PM EDT for Erie County, Livingston County, Wyoming County, New York. It was in force for 2 hr. 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 3, 2026, 10:13 PM EDT (02:13 UTC)
Expired: Sep 4, 2026, 12:36 AM EDT
In force: 2 hr
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

Counties Erie County, NY, Livingston County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 67 km from the middle of the area, began a volume at 02:13 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 3, 10:30 PM EDT	FLASH FLOOD	Mount Morris, NY	Corrects previous flash flood report from Mount Morris. Water flowing over road in Mount Morris. Delayed report.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 00:00Z, 2.2 hours before the alert went out and 298 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 53 J/kg
Mixed-layer CIN: -217 J/kg
Mixed-layer LCL: 1296 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted.

284 
WGUS51 KBUF 040213
FFWBUF
NYC029-051-121-040615-
/O.NEW.KBUF.FF.W.0019.260904T0213Z-260904T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Buffalo NY
1013 PM EDT Thu Sep 3 2026

The National Weather Service in Buffalo has issued a

* Flash Flood Warning for...
  East Central Erie County in western New York...
  Southern Livingston County in western New York...
  Wyoming County in western New York...

* Until 215 AM EDT.

* At 1013 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Between 1.75 and 2.75 inches of
  rain have fallen. Additional rainfall amounts of 0.75 to 1.25
  inches are possible in the warned area. Flash flooding is ongoing
  or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar indicated.

  IMPACT...Flash flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other poor
           drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  East Aurora, Dansville, Letchworth State Park, Perry, Warsaw, Mount
  Morris, Arcade, Portageville, Varysburg, Chaffee, Wales Center,
  Billington Heights, Holland, Groveland, Sheldon, Nunda, Eagle,
  Pike, Castile and Ossian.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.

&&

LAT...LON 4278 7870 4278 7818 4269 7760 4268 7760
      4258 7761 4258 7766 4254 7766 4253 7772
      4247 7772 4247 7784 4252 7784 4252 7804
      4252 7833 4254 7843 4263 7863 4268 7868

FLASH FLOOD...RADAR INDICATED

$$

Thomas

2 follow-up statements

709 
WGUS71 KBUF 040353
FFSBUF

Flash Flood Statement
National Weather Service Buffalo NY
1153 PM EDT Thu Sep 3 2026

NYC029-051-121-040615-
/O.CON.KBUF.FF.W.0019.000000T0000Z-260904T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Erie NY-Livingston NY-Wyoming NY-
1153 PM EDT Thu Sep 3 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 215 AM EDT FRIDAY FOR
EAST CENTRAL ERIE, SOUTHERN LIVINGSTON AND WYOMING COUNTIES...

At 1153 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 2.5 and 3.5 inches of rain have
fallen. Additional rainfall amounts up to 0.25 inches are possible in
the warned area. Flash flooding is ongoing or expected to begin
shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar indicated.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  East Aurora, Dansville, Letchworth State Park, Perry, Warsaw, Mount
  Morris, Arcade, Portageville, Varysburg, Chaffee, Wales Center,
  Billington Heights, Holland, Groveland, Sheldon, Nunda, Eagle,
  Pike, Castile and Ossian.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.

&&

LAT...LON 4278 7870 4278 7818 4269 7760 4268 7760
      4258 7761 4258 7766 4254 7766 4253 7772
      4247 7772 4247 7784 4252 7784 4252 7804
      4252 7833 4254 7843 4263 7863 4268 7868

FLASH FLOOD...RADAR INDICATED

$$

DRT

457 
WGUS71 KBUF 040436
FFSBUF

Flash Flood Statement
National Weather Service Buffalo NY
1236 AM EDT Fri Sep 4 2026

NYC029-051-121-040446-
/O.CAN.KBUF.FF.W.0019.000000T0000Z-260904T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Erie NY-Livingston NY-Wyoming NY-
1236 AM EDT Fri Sep 4 2026

...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL ERIE, SOUTHERN
LIVINGSTON AND WYOMING COUNTIES...

The heavy rain has ended. Flood waters have receded. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.

&&

LAT...LON 4278 7870 4278 7818 4269 7760 4268 7760
      4258 7761 4258 7766 4254 7766 4253 7772
      4247 7772 4247 7784 4252 7784 4252 7804
      4252 7833 4254 7843 4263 7863 4268 7868

$$

DRT

The office that day

Everything else NWS Buffalo, NY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 3, 8:47 PM EDT	Flash Flood Warning	BUF	Erie, Wyoming	4 hr

Nearby

Flash Flood Warnings in New York, 2026 Every flash flood 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.