Alert archive / New York / Flash Flood Warnings in 2011

Flash Flood Warning 2, NWS Buffalo, NY

April 26, 2011Ontario County, Wayne County, New York

NWS Buffalo, NY issued this flash flood warning at Apr 26, 2011, 7:10 PM EDT for Ontario County, Wayne 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
Apr 26, 2011, 7:10 PM EDT (23:10 UTC)
Expired
Apr 26, 2011, 10:15 PM EDT
In force
3 hr
Issued by
NWS Buffalo, NY
Area
Storm-based polygon
Flood severity
None

Counties Ontario County, NY, Wayne County, NY

The radar

The Buffalo radar (KBUF), 122 km from the middle of the area, began a volume at 23:13 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
Apr 26, 7:35 PM EDTFLASH FLOOD1 Nne Willow Beach, NYE LAKE RD WASHED OUT

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, 11.2 hours before the alert went out and 118 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 2011-04-26Temperature 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°0°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 2011-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 128 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
493 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
128 m²/s²
0-3 km storm-relative helicity
237 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

233 
WGUS51 KBUF 262310
FFWBUF
NYC069-117-270215-
/O.NEW.KBUF.FF.W.0002.110426T2310Z-110427T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
710 PM EDT TUE APR 26 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ONTARIO COUNTY IN WESTERN NEW YORK...
  THIS INCLUDES THE CITIES OF...GENEVA...CANANDAIGUA...
  WAYNE COUNTY IN WESTERN NEW YORK...

* UNTIL 1015 PM EDT

* AT 703 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  FLASH FLOODING OVER THE WARNED AREA. AN INCH TO AN INCH AND A HALF 
  OF RAIN HAS FALLEN...WITH AN ADDITIONAL HALF INCH EXPECTED AS      
  ANOTHER LINE OF STORMS MOVES THROUGH. THIS WILL CAUSE SOME AREA    
  CREEKS TO RISE RAPIDLY...POTENTIALLY FLOODING ROADS.

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 4266 7748 4280 7753 4304 7739 4304 7737
      4306 7737 4318 7724 4329 7672 4302 7672
      4300 7695 4276 7697 4276 7731 4266 7736
      4258 7735 4257 7748

$$

APFFEL
2 follow-up statements
173 
WGUS71 KBUF 270010
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
810 PM EDT TUE APR 26 2011

NYC069-117-270215-
/O.CON.KBUF.FF.W.0002.000000T0000Z-110427T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ONTARIO NY-WAYNE NY-
810 PM EDT TUE APR 26 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 PM EDT FOR
WAYNE AND ONTARIO COUNTIES...

AT 801 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED UP 
TO TWO INCHES OF RAIN HAS FALLEN ACROSS PORTIONS OF WAYNE AND 
ONTARIO COUNTIES. RAIN WILL CONTINUE FOR THE NEXT HOUR OR SO...WITH 
SOME AREAS LIKELY TO RECEIVE UP TO TWO AND HALF INCHES OF RAIN. 
FLASH FLOODING IS LIKELY IN AREAS OF HEAVY RAIN. BE ALERT FOR WASHED 
OUT ROADWAYS...ESPECIALLY IN HILLY TERRAIN.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
CANANDAIGUA...MARION...VICTOR...PHELPS...PALMYRA...NEWARK...LYONS...
CLYDE AND CLIFTON SPRINGS

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

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.

&&

LAT...LON 4266 7748 4280 7753 4304 7739 4304 7737
      4306 7737 4318 7724 4329 7672 4302 7672
      4300 7695 4276 7697 4276 7731 4266 7736
      4258 7735 4257 7748

$$

APFFEL
433 
WGUS71 KBUF 270213
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
1013 PM EDT TUE APR 26 2011

NYC069-117-270222-
/O.EXP.KBUF.FF.W.0002.000000T0000Z-110427T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ONTARIO NY-WAYNE NY-
1013 PM EDT TUE APR 26 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1015 PM EDT FOR WAYNE AND
ONTARIO COUNTIES...

AT 1012 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE 
THUNDERSTORMS THAT PROMPTED THE WARNING HAD LONG SINCE EXITED THE 
AREA...ENDING THE THREAT OF ADDITIONAL FLASH FLOODING. THEREFORE... 
THE FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE.

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

LAT...LON 4266 7748 4280 7753 4304 7739 4304 7737
      4306 7737 4318 7724 4329 7672 4302 7672
      4300 7695 4276 7697 4276 7731 4266 7736
      4258 7735 4257 7748

$$

JJR

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 25, 8:36 PM EDTAreal Flood AdvisoryBUFChautauqua, Erie, Genesee6 hr
Apr 26, 3:07 AM EDTRiver Flood WarningBUFErie, Wyoming3 hr
Apr 26, 3:07 AM EDTRiver Flood WarningBUFErie3 hr
Apr 26, 3:41 AM EDTSmall Craft AdvisoryBUF18 hr
Apr 26, 12:59 PM EDTSpecial Weather StatementBUFAllegany31 min
Apr 26, 2:00 PM EDTSevere Thunderstorm WarningBUFOntario45 min
Apr 26, 2:26 PM EDTSevere Thunderstorm WarningBUFCayuga, Ontario, Oswego, Wayne49 min
Apr 26, 3:53 PM EDTSpecial Weather StatementBUFOswego52 min
Apr 26, 4:43 PM EDTSevere Thunderstorm WarningBUFGenesee, Monroe, Orleans47 min
Apr 26, 4:44 PM EDTSevere Thunderstorm WarningBUFMonroe46 min
Apr 26, 4:50 PM EDTSevere Thunderstorm WarningBUFCayuga, Oswego55 min
Apr 26, 4:53 PM EDTSpecial Marine WarningBUF58 min
Apr 26, 5:05 PM EDTSevere Thunderstorm WarningBUFLewis, Oswego40 min
Apr 26, 5:27 PM EDTFlash Flood WarningBUFAllegany5 hr
Apr 26, 5:40 PM EDTSevere Thunderstorm WarningBUFCayuga, Ontario, Wayne50 min
Apr 26, 5:46 PM EDTSpecial Weather StatementBUFLewis59 min
Apr 26, 5:49 PM EDTSpecial Marine WarningBUF86 min
Apr 26, 6:14 PM EDTSpecial Weather StatementBUFAllegany61 min
Apr 26, 6:19 PM EDTAreal Flood AdvisoryBUFOntario, Wayne2 hr
Apr 26, 6:22 PM EDTSevere Thunderstorm WarningBUFAllegany38 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.