Alert archive / New York / Flash Flood Warnings in 2011

Flash Flood Warning 9, NWS Buffalo, NY

May 23, 2011Chautauqua County, New York

NWS Buffalo, NY issued this flash flood warning at May 23, 2011, 9:24 PM EDT for Chautauqua County, New York. It was in force for 3 hr. 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 23, 2011, 9:24 PM EDT (01:24 UTC)
Expired
May 24, 2011, 12:15 AM EDT
In force
3 hr
Issued by
NWS Buffalo, NY
Area
Storm-based polygon
Flood severity
None

County Chautauqua County, NY

The radar

The Buffalo radar (KBUF), 110 km from the middle of the area, began a volume at 01:27 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.

What was reported inside it

TimeReportWhereRemark
May 23, 11:30 PM EDTFLASH FLOODLakewood, NYSEVERAL ROADS CLOSED IN LAKEWOOD

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 00:00Z, 1.4 hours before the alert went out and 110 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 00:00Z on 2011-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 191 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 00:00Z on 2011-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 172 square meters per square second.19395878Sfc1 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
191 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
1252 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
172 m²/s²
0-3 km storm-relative helicity
226 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.4

Open this sounding in Storm Lab

The text

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

411 
WGUS51 KBUF 240124
FFWBUF
NYC013-240415-
/O.NEW.KBUF.FF.W.0009.110524T0124Z-110524T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
924 PM EDT MON MAY 23 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CHAUTAUQUA COUNTY IN WESTERN NEW YORK...
  THIS INCLUDES THE CITY OF JAMESTOWN...

* UNTIL 1215 AM EDT

* AT 920 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A LINE OF STRONG TO SEVERE THUNDERSTORMS THAT WILL TRAIN ACROSS 
  MUCH OF CHAUTAUQUA COUNTY. DOPPLER RADAR ALREADY ESTIMATES THAT
  OVER AN INCH OF RAIN HAS FALLEN ACROSS THE SOUTHERN THIRD OF THE
  COUNTY.  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

&&

LAT...LON 4226 7978 4229 7975 4238 7954 4240 7907
      4199 7908 4199 7958 4199 7976 4200 7977

$$

RSH
2 follow-up statements
790 
WGUS71 KBUF 240242
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
1042 PM EDT MON MAY 23 2011

NYC013-240415-
/O.CON.KBUF.FF.W.0009.000000T0000Z-110524T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHAUTAUQUA NY-
1042 PM EDT MON MAY 23 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 AM EDT FOR
CHAUTAUQUA COUNTY...

AT 1035 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE WIDESPREAD THUNDERSTORM ACTIVITY WHICH IS PRODUCING 
RAINFALL RATES IN EXCESS OF ONE INCH PER HOUR. DOPPLER RADAR 
ESTIMATES THAT SOME AREAS WITHIN THE WARNED AREA HAVE ALREADY 
RECEIVED MORE THAN 2 INCHES OF RAIN...WITH ANOTHER INCH ORE MORE OF 
RAIN POSSIBLE BEFORE THE STORMS END.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CHAUTAUQUA
INSTITUTE...WESTFIELD AND MAYVILLE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

&&

LAT...LON 4226 7978 4229 7975 4238 7954 4240 7907
      4199 7908 4199 7958 4199 7976 4200 7977

$$

RSH
837 
WGUS71 KBUF 240425
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
1225 AM EDT TUE MAY 24 2011

NYC013-240435-
/O.EXP.KBUF.FF.W.0009.000000T0000Z-110524T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHAUTAUQUA NY-
1225 AM EDT TUE MAY 24 2011

...THE FLASH FLOOD WARNING HAS EXPIRED FOR CHAUTAUQUA COUNTY...

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

LAT...LON 4226 7978 4229 7975 4238 7954 4240 7907
      4199 7908 4199 7958 4199 7976 4200 7977

$$

RSH

The office that day

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

IssuedProductOfficeCountiesLasted
May 23, 8:23 PM EDTSevere Thunderstorm WarningBUFChautauqua37 min
May 23, 8:45 PM EDTSpecial Marine WarningBUF30 min
May 23, 8:54 PM EDTTornado WarningBUFChautauqua36 min
May 23, 9:14 PM EDTSevere Thunderstorm WarningBUFErie17 min
May 23, 9:59 PM EDTFlash Flood WarningBUFCattaraugus, Chautauqua3 hr
May 23, 10:05 PM EDTSevere Thunderstorm WarningBUFAllegany, Cattaraugus25 min
May 23, 10:30 PM EDTSevere Thunderstorm WarningBUFAllegany, Cattaraugus45 min
May 23, 10:56 PM EDTAreal Flood AdvisoryBUFCattaraugus, Chautauqua, Erie, Wyoming3 hr
May 23, 11:09 PM EDTFlash Flood WarningBUFAllegany, Cattaraugus, Wyoming3 hr
May 23, 11:13 PM EDTSevere Thunderstorm WarningBUFAllegany17 min
May 24, 9:27 AM EDTSmall Craft AdvisoryBUF4 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.