Alert archive / New York / Flash Flood Warnings in 2012

Flash Flood Warning 8, NWS Buffalo, NY

September 4, 2012Allegany County, New York

NWS Buffalo, NY issued this flash flood warning at Sep 4, 2012, 7:05 PM EDT for Allegany County, New York. It was in force for 90 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 4, 2012, 7:05 PM EDT (23:05 UTC)
Expired: Sep 4, 2012, 8:35 PM EDT
In force: 90 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

County Allegany County, NY

The radar

The Buffalo radar (KBUF), 81 km from the middle of the area, began a volume at 23:06 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, 11.1 hours before the alert went out and 77 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: 892 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 806 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

777 
WGUS51 KBUF 042305
FFWBUF
NYC003-050200-
/O.NEW.KBUF.FF.W.0008.120904T2305Z-120905T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
705 PM EDT TUE SEP 4 2012

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN ALLEGANY COUNTY IN WESTERN NEW YORK...

* UNTIL 1000 PM EDT

* AT 702 PM EDT...NATIONAL WEATHER SERVICE DUAL-POL DOPPLER RADAR 
INDICATED FLASH FLOODING FROM TRAINING HEAVY STORMS OVER THE WARNED 
AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT ONLY TAKES A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

&&

LAT...LON 4252 7831 4251 7785 4247 7785 4244 7784
      4228 7784 4228 7831

$$

SMITH

1 follow-up statement

488 
WGUS71 KBUF 050035
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
835 PM EDT TUE SEP 4 2012

NYC003-050045-
/O.CAN.KBUF.FF.W.0008.000000T0000Z-120905T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLEGANY NY-
835 PM EDT TUE SEP 4 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHERN ALLEGANY
COUNTY...

AT 835 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE AREA 
HEAVY RAIN THAT PROMPTED THE WARNING HAD EXITED THE AREA...THUS THE 
FLOOD WARNING HAS BEEN CANCELLED.

LAT...LON 4252 7831 4251 7785 4247 7785 4244 7784
      4228 7784 4228 7831

$$

REYNOLDS

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 4, 12:32 PM EDT	Special Weather Statement	BUF	Monroe	58 min
Sep 4, 1:44 PM EDT	Special Weather Statement	BUF	Wayne	61 min
Sep 4, 3:20 PM EDT	Special Weather Statement	BUF	Genesee, Monroe, Niagara, Orleans, Wayne	85 min
Sep 4, 3:33 PM EDT	Areal Flood Advisory	BUF	Wayne	3 hr
Sep 4, 3:47 PM EDT	Areal Flood Advisory	BUF	Genesee, Monroe, Orleans	3 hr
Sep 4, 4:34 PM EDT	Special Weather Statement	BUF	Erie	26 min
Sep 4, 5:09 PM EDT	Special Weather Statement	BUF	Livingston, Wyoming	21 min
Sep 4, 5:35 PM EDT	Special Weather Statement	BUF	Jefferson, Lewis, Oswego	70 min
Sep 4, 5:39 PM EDT	Special Weather Statement	BUF	Livingston	36 min
Sep 4, 5:43 PM EDT	Special Weather Statement	BUF	Allegany, Cattaraugus	77 min
Sep 4, 6:26 PM EDT	Special Weather Statement	BUF	Livingston	34 min
Sep 4, 6:33 PM EDT	Areal Flood Advisory	BUF	Jefferson, Lewis, Oswego	3 hr

Nearby

Flash Flood Warnings in New York, 2012 Every flash flood warning in 2012

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.