Alert archive / New York / Flash Flood Warnings in 2011

Flash Flood Warning 19, NWS Buffalo, NY

August 19, 2011Allegany County, New York

NWS Buffalo, NY issued this flash flood warning at Aug 19, 2011, 12:39 PM EDT for Allegany County, New York. It was in force for 110 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
Aug 19, 2011, 12:39 PM EDT (16:39 UTC)
Expired
Aug 19, 2011, 2:29 PM EDT
In force
110 min
Issued by
NWS Buffalo, NY
Area
Storm-based polygon
Flood severity
None

County Allegany County, NY

The radar

The Buffalo radar (KBUF), 82 km from the middle of the area, began a volume at 16:42 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, 4.7 hours before the alert went out and 78 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 2011-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 551 joules per kilogram.LCLLFCEL10008507005003002001001 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 2011-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 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
551 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
1064 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
44 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.

618 
WGUS51 KBUF 191639
FFWBUF
NYC003-191930-
/O.NEW.KBUF.FF.W.0019.110819T1639Z-110819T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
1239 PM EDT FRI AUG 19 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

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

* UNTIL 330 PM EDT

* AT 1228 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR            
  INDICATED   FLASH FLOODING FROM THUNDERSTORMS ALONG A LINE         
  EXTENDING ALONG A LINE FROM FILLMORE TO 5 MILES NORTH OF BELFAST   
  MOVING EAST AT 15 MPH.

ROADS LEADING INTO RTE 19 IN THE VICINITY OF FILLMORE WERE UNDER THE 
HEAVIEST RAINFALL.   

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN A VEHICLE TURN AROUND...DO NOT DROWN. 

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 4251 7822 4253 7815 4252 7784 4248 7784
      4247 7772 4232 7773 4230 7820

$$

NIZIOL
2 follow-up statements
869 
WGUS71 KBUF 191714
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
114 PM EDT FRI AUG 19 2011

NYC003-191930-
/O.CON.KBUF.FF.W.0019.000000T0000Z-110819T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLEGANY NY-
114 PM EDT FRI AUG 19 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 PM EDT FOR
NORTHERN ALLEGANY COUNTY...

AT 105 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT THE HEAVIEST RAINFALL HAD MOVED SOUTH OF THE REGION.  HOWEVER, 
ESTIMATES OF MORE THAN 2 INCHES OF RAIN HAD OCCURRED OVER THE RUSH 
CREEK AREA AROUND FILLMORE IN A LITTLE OVER ONE HOUR.  THAT RAINFALL 
WILL CONTINUE TO SWELL RUSH CREEK AND OTHER SMALLER TRIBUTARIES 
LEADING TO FLOODING THROUGH 330 PM. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EVEN THOUGH THE RAIN HAS ENDED 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.

IF YOU ARE IN A VEHICLE TURN AROUND DON'T DROWN.
&&

LAT...LON 4251 7822 4253 7815 4252 7784 4248 7784
      4247 7772 4232 7773 4230 7820

$$

NIZIOL
779 
WGUS71 KBUF 191829
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
229 PM EDT FRI AUG 19 2011

NYC003-191836-
/O.CAN.KBUF.FF.W.0019.000000T0000Z-110819T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLEGANY NY-
229 PM EDT FRI AUG 19 2011

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

AT 226 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE
THUNDERSTORM THAT PROMPTED THE WARNING HAD EXITED THE AREA...THUS THE
FLOOD WARNING HAS BEEN CANCELLED.

RADAR ESTIMATED OF OVER 2 INCHES OF RAINFALL IN ONE HOUR OVER THE 
RUSH CREEK BASIN NEAR FILLMORE FROM THESE STORMS.  ALTHOUGH THE 
STORMS HAVE EXITED THE AREA, DRIVERS ARE URGED TO USE CAUTION SINCE 
RUNOFF CAN STILL CAUSE PONDING IN LOW LYING AREAS WELL AFTER 
RAINFALL HAS ENDED. 

LAT...LON 4251 7822 4253 7815 4252 7784 4248 7784
      4247 7772 4232 7773 4230 7820

$$

NIZIOL

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 19, 12:13 AM EDTSpecial Weather StatementBUFCattaraugus62 min
Aug 19, 12:59 AM EDTSpecial Weather StatementBUFCattaraugus61 min
Aug 19, 12:08 PM EDTAreal Flood AdvisoryBUFAllegany3 hr
Aug 19, 12:10 PM EDTSevere Thunderstorm WarningBUFAllegany65 min
Aug 19, 1:15 PM EDTSevere Thunderstorm WarningBUFWyoming45 min
Aug 19, 2:20 PM EDTSpecial Weather StatementBUFLivingston55 min
Aug 19, 3:50 PM EDTSpecial Weather StatementBUFAllegany55 min
Aug 19, 3:51 PM EDTSpecial Weather StatementBUFAllegany54 min
Aug 19, 4:06 PM EDTAreal Flood AdvisoryBUFAllegany119 min
Aug 19, 5:55 PM EDTSpecial Weather StatementBUFOntario65 min
Aug 19, 6:23 PM EDTAreal Flood AdvisoryBUFLivingston, Ontario97 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.