Alert archive / New York / Flash Flood Warnings in 2011

Flash Flood Warning 23, NWS Buffalo, NY

September 11, 2011Livingston County, Wyoming County, New York

NWS Buffalo, NY issued this flash flood warning at Sep 11, 2011, 1:34 PM EDT for Livingston County, Wyoming County, New York. It was in force for 3 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
Sep 11, 2011, 1:34 PM EDT (17:34 UTC)
Expired
Sep 11, 2011, 4:30 PM EDT
In force
3 hr
Issued by
NWS Buffalo, NY
Area
Storm-based polygon
Flood severity
None

Counties Livingston County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 61 km from the middle of the area, began a volume at 17:36 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, 5.6 hours before the alert went out and 57 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-pSkew-T log-p diagram, Buffalo Intl Airport, NY at 12:00Z on 2011-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Buffalo Intl Airport, NY at 12:00Z on 2011-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1397 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
19 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.

504 
WGUS51 KBUF 111734
FFWBUF
NYC051-121-112030-
/O.NEW.KBUF.FF.W.0023.110911T1734Z-110911T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
134 PM EDT SUN SEP 11 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WEST CENTRAL LIVINGSTON COUNTY IN WESTERN NEW YORK...
  NORTHEASTERN WYOMING COUNTY IN WESTERN NEW YORK...

* UNTIL 430 PM EDT

* AT 131 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA. TOTAL     
  RAINFALL AMOUNTS IN EXCESS OF TWO INCHES ARE LIKELY...ESPECIALLY   
  IN THE VICINITY OF WYOMING AND WARSAW.

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.

&&

LAT...LON 4271 7814 4286 7813 4287 7807 4286 7807
      4286 7796 4289 7796 4291 7784 4278 7788
      4271 7797

$$

APFFEL
2 follow-up statements
935 
WGUS71 KBUF 111842
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
242 PM EDT SUN SEP 11 2011

NYC051-121-112030-
/O.CON.KBUF.FF.W.0023.000000T0000Z-110911T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LIVINGSTON NY-WYOMING NY-
242 PM EDT SUN SEP 11 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 PM EDT FOR
NORTHEASTERN WYOMING AND WEST CENTRAL LIVINGSTON COUNTIES...

AT 236 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING OVER THE WARNED 
AREA. RADAR ESTIMATES AROUND TWO INCHES OF RAIN HAS FALLEN NEAR AND 
JUST EAST OF THE TOWN OF WYOMING. IN ADDITION...THERE IS ANOTHER 
THUNDERSTORM HEADING TOWARD THE WARNED AREA...WITH AN ADDITIONAL 
INCH OR MORE OF RAINFALL POSSIBLE. 

THIS IS LIKELY TO CAUSE CREEKS AND STREAMS TO RISE TO AND ABOVE BANK 
FULL. STREAMS AND CREEKS MAY CONTINUE TO RISE EVEN AFTER THE 
HEAVIEST RAIN HAS ENDED. 

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.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 4271 7814 4286 7813 4287 7807 4286 7807
      4286 7796 4288 7796 4288 7787 4278 7788
      4271 7797

$$

APFFEL
010 
WGUS71 KBUF 112033
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
433 PM EDT SUN SEP 11 2011

NYC051-121-112042-
/O.EXP.KBUF.FF.W.0023.000000T0000Z-110911T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LIVINGSTON NY-WYOMING NY-
433 PM EDT SUN SEP 11 2011

...THE FLASH FLOOD WARNING HAS EXPIRED FOR NORTHEASTERN WYOMING AND
WEST CENTRAL LIVINGSTON COUNTIES...

AT 432 PM EDT...NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE 
THUNDERSTORMS THAT PROMPTED THE WARNING HAD EXITED THE AREA...THUS 
THE FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE.

PONDING OF LOW LYING AND POOR DRAINAGE AREAS WILL BE POSSIBLE FOR
AWHILE UNTIL THE WATER HAS TIME TO RUN OFF.

LAT...LON 4271 7814 4286 7813 4287 7807 4286 7807
      4286 7796 4288 7796 4288 7787 4278 7788
      4271 7797

$$

TMA

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 11, 12:34 PM EDTSpecial Weather StatementBUFErie56 min
Sep 11, 12:40 PM EDTFlash Flood WarningBUFCattaraugus, Chautauqua, Erie3 hr
Sep 11, 12:43 PM EDTSpecial Weather StatementBUFGenesee62 min
Sep 11, 12:46 PM EDTSevere Thunderstorm WarningBUFGenesee, Livingston, Monroe, Wyoming44 min
Sep 11, 1:33 PM EDTSevere Thunderstorm WarningBUFLivingston, Wyoming42 min
Sep 11, 1:55 PM EDTSevere Thunderstorm WarningBUFOntario50 min
Sep 11, 2:04 PM EDTSevere Thunderstorm WarningBUFGenesee, Wyoming41 min
Sep 11, 2:17 PM EDTSevere Thunderstorm WarningBUFGenesee, Livingston, Ontario, Wyoming43 min
Sep 11, 2:46 PM EDTSevere Thunderstorm WarningBUFLivingston, Monroe, Ontario44 min
Sep 11, 4:31 PM EDTSpecial Weather StatementBUFChautauqua59 min
Sep 11, 5:01 PM EDTSpecial Weather StatementBUFErie59 min
Sep 11, 5:21 PM EDTAreal Flood AdvisoryBUFNiagara114 min

Nearby

Flash Flood Warnings in New York, 2011Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.