Alert archive / New York / Flash Flood Warnings in 2026

Flash Flood Warning 16, NWS Buffalo, NY

September 2, 2026Allegany County, Cattaraugus County, New York

NWS Buffalo, NY issued this flash flood warning at Sep 2, 2026, 8:46 PM EDT for Allegany County, Cattaraugus County, New York. It was in force for 4 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 2, 2026, 8:46 PM EDT (00:46 UTC)
Expired: Sep 3, 2026, 12:37 AM EDT
In force: 4 hr
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

Counties Allegany County, NY, Cattaraugus County, NY

The radar

The Buffalo radar (KBUF), 83 km from the middle of the area, began a volume at 00:46 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, 9:35 PM EDT	FLASH FLOOD	3 Ne Ellicottville, NY	Delayed report of fast moving water over the roadway with a large amount of debris making the road impassable. Video from social media.

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, 0.8 hours before the alert went out and 246 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: 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

Open this sounding in Storm Lab

The text

As transmitted.

565 
WGUS51 KBUF 030046
FFWBUF
NYC003-009-030445-
/O.NEW.KBUF.FF.W.0016.260903T0046Z-260903T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Buffalo NY
846 PM EDT Wed Sep 2 2026

The National Weather Service in Buffalo has issued a

* Flash Flood Warning for...
  Allegany County in western New York...
  Cattaraugus County in western New York...

* Until 1245 AM EDT.

* At 846 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Between 1.5 and 2.5 inches of
  rain have fallen. Additional rainfall amounts of 0.5 to 1 inch 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...
  Olean, Salamanca, Wellsville, Allegany State Park, Ashford,
  Allegany, Franklinville, Belfast, Cuba, Rushford, Weston Mills, St.
  Bonaventure, Houghton, Caneadea, Hinsdale, Friendship, Great
  Valley, New Albion, Scio and Carrollton.

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.

Be aware of your surroundings and do not drive on flooded roads.

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 4205 7831 4205 7837 4207 7868 4212 7897
      4227 7902 4235 7890 4241 7865 4245 7850
      4247 7833 4244 7793 4226 7785 4209 7785

FLASH FLOOD...RADAR INDICATED

$$

Thomas

2 follow-up statements

036 
WGUS71 KBUF 030225
FFSBUF

Flash Flood Statement
National Weather Service Buffalo NY
1025 PM EDT Wed Sep 2 2026

NYC003-009-030445-
/O.CON.KBUF.FF.W.0016.000000T0000Z-260903T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allegany NY-Cattaraugus NY-
1025 PM EDT Wed Sep 2 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1245 AM EDT THURSDAY
FOR ALLEGANY AND CATTARAUGUS COUNTIES...

At 1025 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 of 0.5 to 1 inch 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...
  Olean, Salamanca, Wellsville, Allegany State Park, Ashford,
  Allegany, Franklinville, Belfast, Cuba, Rushford, Weston Mills, St.
  Bonaventure, Houghton, Caneadea, Hinsdale, Friendship, Great
  Valley, New Albion, Scio and Carrollton.

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.

Be aware of your surroundings and do not drive on flooded roads.

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 4205 7831 4205 7837 4207 7868 4212 7897
      4227 7902 4235 7890 4241 7865 4245 7850
      4247 7833 4244 7793 4226 7785 4209 7785

FLASH FLOOD...RADAR INDICATED

$$

Thomas

673 
WGUS71 KBUF 030437
FFSBUF

Flash Flood Statement
National Weather Service Buffalo NY
1237 AM EDT Thu Sep 3 2026

NYC003-009-030447-
/O.CAN.KBUF.FF.W.0016.000000T0000Z-260903T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allegany NY-Cattaraugus NY-
1237 AM EDT Thu Sep 3 2026

...FLASH FLOOD WARNING IS CANCELLED FOR ALLEGANY AND CATTARAUGUS
COUNTIES...

Water is slowly beginning to recede in the warned area, while small
streams and creeks will continue to flow near bankfull. Flooding is
no longer expected to pose a threat. Please continue to heed
remaining road closures.

&&

LAT...LON 4205 7831 4205 7837 4207 7868 4212 7897
      4227 7902 4235 7890 4241 7865 4245 7850
      4247 7833 4244 7793 4226 7785 4209 7785

$$

Thomas

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, 8:55 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 Considerable damage threat	BUF	Cattaraugus, Chautauqua	75 min
Sep 2, 10:17 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	43 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

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.