Alert archive / New York / Flash Flood Warnings in 2021

Flash Flood Warning 24, NWS Buffalo, NY

October 4, 2021Chautauqua County, New York

NWS Buffalo, NY issued this flash flood warning at Oct 4, 2021, 5:27 PM EDT for Chautauqua County, New York. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Oct 4, 2021, 5:27 PM EDT (21:27 UTC)
Expired: Oct 4, 2021, 7:28 PM EDT
In force: 2 hr
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

County Chautauqua County, NY

The radar

The Buffalo radar (KBUF), 116 km from the middle of the area, began a volume at 21:27 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.

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 9.5 hours before the alert went out and 117 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: 353 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 460 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 58 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

504 
WGUS51 KBUF 042127
FFWBUF
NYC013-050130-
/O.NEW.KBUF.FF.W.0024.211004T2127Z-211005T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Buffalo NY
527 PM EDT Mon Oct 4 2021

The National Weather Service in Buffalo has issued a

* Flash Flood Warning for...
  Southwestern Chautauqua County in western New York...

* Until 930 PM EDT.

* At 527 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 2.5 inches of 
  rain have fallen. Additional rainfall amounts of 1 to 2 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...
  Clymer, Findley Lake, Mina, French Creek, Sherman and Panama.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

&&

LAT...LON 4211 7976 4213 7974 4215 7972 4217 7967
      4219 7956 4218 7951 4218 7949 4216 7947
      4214 7946 4207 7946 4204 7948 4200 7954
      4200 7976

FLASH FLOOD...RADAR INDICATED

$$

JJR

1 follow-up statement

858 
WGUS71 KBUF 042328
FFSBUF

Flash Flood Statement
National Weather Service Buffalo NY
728 PM EDT Mon Oct 4 2021

NYC013-042338-
/O.CAN.KBUF.FF.W.0024.000000T0000Z-211005T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chautauqua NY-
728 PM EDT Mon Oct 4 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN CHAUTAUQUA 
COUNTY...

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

LAT...LON 4211 7976 4213 7974 4215 7972 4217 7967
      4219 7956 4218 7951 4218 7949 4216 7947
      4214 7946 4207 7946 4204 7948 4200 7954
      4200 7976

$$

JJR

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 4, 4:24 PM EDT	Special Weather Statement	BUF	Livingston	66 min
Oct 4, 4:47 PM EDT	Special Weather Statement	BUF	Livingston, Wyoming	58 min
Oct 4, 5:05 PM EDT	Special Weather Statement	BUF	Chautauqua	55 min
Oct 4, 6:08 PM EDT	Special Weather Statement	BUF	Livingston	52 min
Oct 4, 6:37 PM EDT	Special Weather Statement	BUF	Allegany	53 min

Nearby

Flash Flood Warnings in New York, 2021 Every flash flood warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.