Alert archive / New York / Flash Flood Warnings in 2011

Flash Flood Warning 7, NWS Buffalo, NY

May 13, 2011Livingston County, Ontario County, Wyoming County, New York

NWS Buffalo, NY issued this flash flood warning at May 13, 2011, 6:25 PM EDT for Livingston County, Ontario County, Wyoming County, New York. It was in force for 105 min. 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: May 13, 2011, 6:25 PM EDT (22:25 UTC)
Expired: May 13, 2011, 8:10 PM EDT
In force: 105 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

Counties Livingston County, NY, Ontario County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 69 km from the middle of the area, began a volume at 22:25 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
May 13, 6:45 PM EDT	FLASH FLOOD	Geneseo, NY	FLOODING ON ROUTE 15.

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, 10.4 hours before the alert went out and 65 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: 4 J/kg
Mixed-layer CIN: -229 J/kg
Mixed-layer LCL: 969 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 32 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, in the capitals the NWS used until 2016.

432 
WGUS51 KBUF 132225
FFWBUF
NYC051-069-121-140130-
/O.NEW.KBUF.FF.W.0007.110513T2225Z-110514T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
625 PM EDT FRI MAY 13 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL LIVINGSTON COUNTY IN WESTERN NEW YORK...
  THIS INCLUDES THE CITY OF GENESEO...
  EXTREME WEST CENTRAL ONTARIO COUNTY IN WESTERN NEW YORK...
  NORTHEASTERN WYOMING COUNTY IN WESTERN NEW YORK...

* UNTIL 930 PM EDT

* AT 620 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA. RAINFALL    
AMOUNTS IN EXCESS OF AN INCH HAVE FALLEN NEAR AND JUST NORTH OF 
GENESEO...WITH ADDITIONAL HEAVY RAINFALL ANTICIPATED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...
DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM...
EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER
GROUND.

&&

LAT...LON 4272 7814 4287 7804 4286 7796 4290 7796
      4291 7793 4294 7793 4293 7754 4268 7754

$$

APFFEL

1 follow-up statement

797 
WGUS71 KBUF 140010
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
810 PM EDT FRI MAY 13 2011

NYC051-069-121-140018-
/O.CAN.KBUF.FF.W.0007.000000T0000Z-110514T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LIVINGSTON NY-ONTARIO NY-WYOMING NY-
810 PM EDT FRI MAY 13 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHEASTERN
WYOMING...EXTREME WEST CENTRAL ONTARIO AND NORTHERN LIVINGSTON
COUNTIES...

AT 808 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE
THUNDERSTORM THAT PROMPTED THE WARNING HAD WEAKENED...THUS THE FLOOD 
WARNING HAS BEEN CANCELLED. THERE STILL MAY BE PONDING OF WATER OR 
DEBRIS ON A FEW ROADS THROUGH THE EVENING HOURS.

LAT...LON 4272 7814 4287 7804 4286 7796 4290 7796
      4291 7793 4294 7793 4293 7754 4268 7754

$$

APFFEL

The office that day

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

Issued	Product	Office	Counties	Lasted
May 13, 4:02 PM EDT	Areal Flood Advisory	BUF	Cattaraugus, Chautauqua	5 hr
May 13, 4:17 PM EDT	Flash Flood Warning	BUF	Cattaraugus, Chautauqua	3 hr
May 13, 4:25 PM EDT	Areal Flood Advisory	BUF	Allegany	5 hr
May 13, 5:01 PM EDT	Flash Flood Warning	BUF	Livingston, Ontario	116 min
May 13, 5:14 PM EDT	Flash Flood Warning	BUF	Allegany	5 hr
May 13, 5:20 PM EDT	Special Weather Statement	BUF	Wyoming	55 min
May 13, 5:36 PM EDT	Flash Flood Warning	BUF	Cattaraugus, Erie, Wyoming	3 hr

Nearby

Flash Flood Warnings in New York, 2011 Every flash flood warning in 2011

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.