Alert archive / New York / Flash Flood Warnings in 2026

Flash Flood Warning 7, NWS Buffalo, NY

July 18, 2026Livingston County, Monroe County, Ontario County, New York

NWS Buffalo, NY issued this flash flood warning at Jul 18, 2026, 4:05 PM EDT for Livingston County, Monroe County, Ontario 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: Jul 18, 2026, 4:05 PM EDT (20:05 UTC)
Expired: Jul 18, 2026, 8:15 PM EDT
In force: 4 hr
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

Counties Livingston County, NY, Monroe County, NY, Ontario County, NY

The radar

The Buffalo radar (KBUF), 114 km from the middle of the area, began a volume at 20:04 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
Jul 18, 4:09 PM EDT	FLASH FLOOD	5 Ssw Canandaigua, NY	Report of house flooded in Chesire.

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

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 8.1 hours before the alert went out and 111 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: 176 J/kg
Mixed-layer CIN: -138 J/kg
Mixed-layer LCL: 958 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 173 m²/s²
0-3 km storm-relative helicity: 212 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

350 
WGUS51 KBUF 182005
FFWBUF
NYC051-055-069-190015-
/O.NEW.KBUF.FF.W.0007.260718T2005Z-260719T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Buffalo NY
405 PM EDT Sat Jul 18 2026

The National Weather Service in Buffalo has issued a

* Flash Flood Warning for...
  Eastern Livingston County in western New York...
  Southeastern Monroe County in western New York...
  Ontario County in western New York...

* Until 815 PM EDT.

* At 405 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 0.75 and 1.5 inches of 
  rain have fallen. Additional rainfall amounts of 0.5 to 1.5 inches 
  are possible in the warned area. Flash flooding is ongoing or 
  expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  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...
  Geneva, Canandaigua, Geneseo, Avon, Victor, Honeoye Falls, 
  Conesus, Bristol, Lima, Clifton Springs, Scottsville, Phelps, 
  Bloomfield, Naples, Honeoye, Hemlock, Farmington, Mendon, Gorham 
  and East Bloomfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4304 7778 4302 7752 4307 7749 4306 7737
      4303 7737 4304 7718 4304 7713 4301 7713
      4301 7696 4287 7696 4286 7698 4276 7697
      4276 7731 4272 7735 4267 7736 4267 7737
      4258 7737 4258 7766 4279 7784

FLASH FLOOD...RADAR INDICATED

$$

Brothers

1 follow-up statement

285 
WGUS71 KBUF 190008
FFSBUF

Flash Flood Statement
National Weather Service Buffalo NY
808 PM EDT Sat Jul 18 2026

NYC051-055-069-190018-
/O.EXP.KBUF.FF.W.0007.000000T0000Z-260719T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Livingston NY-Monroe NY-Ontario NY-
808 PM EDT Sat Jul 18 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 815 PM EDT THIS EVENING FOR 
EASTERN LIVINGSTON, SOUTHEASTERN MONROE AND ONTARIO COUNTIES...

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

&&

LAT...LON 4304 7778 4302 7752 4307 7749 4306 7737
      4303 7737 4304 7718 4304 7713 4301 7713
      4301 7696 4287 7696 4286 7698 4276 7697
      4276 7731 4272 7735 4267 7736 4267 7737
      4258 7737 4258 7766 4279 7784

$$

TMA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 3:46 AM EDT	Beach Hazards Statement	BUF	Cayuga, Chautauqua, Erie, Jefferson, Monroe, Orleans and 2 more	26 hr
Jul 18, 10:43 AM EDT	Special Marine Warning	BUF		51 min
Jul 18, 11:41 AM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Niagara, Orleans	64 min
Jul 18, 12:04 PM EDT	Special Marine Warning	BUF		56 min
Jul 18, 12:35 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Monroe, Ontario, Wayne	70 min
Jul 18, 12:55 PM EDT	Flash Flood Warning	BUF	Genesee, Monroe, Niagara, Orleans	6 hr
Jul 18, 1:05 PM EDT	Tornado Warning	BUF	Ontario	40 min
Jul 18, 1:06 PM EDT	Special Marine Warning	BUF		54 min
Jul 18, 1:25 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Niagara, Orleans	65 min
Jul 18, 1:59 PM EDT	Special Marine Warning	BUF		46 min
Jul 18, 2:24 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Livingston, Monroe, Niagara, Orleans	81 min
Jul 18, 2:44 PM EDT	Tornado Warning	BUF	Genesee, Livingston, Monroe, Orleans	31 min
Jul 18, 3:25 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Monroe, Ontario, Wayne	65 min
Jul 18, 3:32 PM EDT	Special Marine Warning	BUF		43 min
Jul 18, 3:40 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Livingston, Wyoming	47 min
Jul 18, 3:54 PM EDT	Areal Flood Warning	BUF	Monroe	15 hr
Jul 18, 4:10 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua	50 min
Jul 18, 4:35 PM EDT	Special Marine Warning	BUF		85 min

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.