Alert archive / New York / Flash Flood Warnings in 2011

Flash Flood Warning 10, NWS Buffalo, NY

May 23, 2011Cattaraugus County, Chautauqua County, New York

NWS Buffalo, NY issued this flash flood warning at May 23, 2011, 9:59 PM EDT for Cattaraugus County, Chautauqua 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: May 23, 2011, 9:59 PM EDT (01:59 UTC)
Expired: May 24, 2011, 1:00 AM EDT
In force: 3 hr
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

Counties Cattaraugus County, NY, Chautauqua County, NY

The radar

The Buffalo radar (KBUF), 83 km from the middle of the area, began a volume at 02:01 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 00:00Z, 2.0 hours before the alert went out and 81 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: 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.

348 
WGUS51 KBUF 240159
FFWBUF
NYC009-013-240500-
/O.NEW.KBUF.FF.W.0010.110524T0159Z-110524T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CATTARAUGUS COUNTY IN WESTERN NEW YORK...
  THIS INCLUDES THE CITIES OF...SALAMANCA...OLEAN...
  EXTREME SOUTHEASTERN CHAUTAUQUA COUNTY IN WESTERN NEW YORK...

* UNTIL 100 AM EDT

* AT 955 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A LARGE AREA OF SHOWERS AND STRONG THUNDERSTORMS OVER CATTARAUGUS 
  COUNTY WITH ADDITIONAL STORMS MOVING EAST FROM CHAUTAUQUA COUNTY
  AND LAKE ERIE. THE TRAINING OF THESE STORMS OVER THE SAME AREA 
  WILL LIKELY PRODUCE RAINFALL AMOUNTS IN EXCESS OF 2 INCHES.  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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. FIND ALTERNATE ROUTES. IT ONLY TAKES A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

&&

LAT...LON 4241 7908 4241 7833 4201 7833 4199 7900
      4199 7909

$$

RSH

3 follow-up statements

236 
WGUS71 KBUF 240312
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
1112 PM EDT MON MAY 23 2011

NYC009-013-240500-
/O.CON.KBUF.FF.W.0010.000000T0000Z-110524T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CATTARAUGUS NY-CHAUTAUQUA NY-
1112 PM EDT MON MAY 23 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 100 AM EDT FOR
EXTREME SOUTHEASTERN CHAUTAUQUA AND CATTARAUGUS COUNTIES...

AT 1105 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING OVER THE WARNED
AREA.

NATIONAL WEATHER SERVICE DOPPLER RADAR ESTIMATES THAT OVER 2 INCHES 
HAVE ALREADY FALLEN ACROSS SOUTHERN PARTS OF THE COUNTY...WITH 
RAINFALL RATES OF ONE INCH PER HOUR COMMON COUNTYWIDE.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ASHFORD
HOLLOW...ASHFORD...SALAMANCA AND FRANKLINVILLE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

&&

LAT...LON 4241 7908 4241 7833 4201 7833 4199 7900
      4199 7909

$$

RSH

941 
WGUS71 KBUF 240428
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
1228 AM EDT TUE MAY 24 2011

NYC009-013-240500-
/O.CON.KBUF.FF.W.0010.000000T0000Z-110524T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CATTARAUGUS NY-CHAUTAUQUA NY-
1228 AM EDT TUE MAY 24 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 100 AM EDT FOR
EXTREME SOUTHEASTERN CHAUTAUQUA AND CATTARAUGUS COUNTIES...

AT 1218 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUES TO 
SHOW SOME SHOWERS AND THUNDERSTORMS OVER THE COUNTY...BUT THE 
ACTIVITY IS WEAKENING. THE HEAVIEST SHOWERS SHOULD BE OUT OF THE 
COUNTY WITHIN THE NEXT HOUR.

DOPPLER RADAR ESTIMATES THAT WIDESPREAD 1 INCH RAINFALL AMOUNTS WERE 
PRODUCED ACROSS THE COUNTY...WITH AMOUNTS EXCEEDING 2 INCHES ACROSS 
SOUTHERN SECTIONS.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ASHFORD
HOLLOW...ASHFORD...SALAMANCA AND FRANKLINVILLE

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 4241 7908 4241 7833 4201 7833 4199 7900
      4199 7909

$$

RSH

977 
WGUS71 KBUF 240501
FFSBUF

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

NYC009-013-240509-
/O.EXP.KBUF.FF.W.0010.000000T0000Z-110524T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CATTARAUGUS NY-CHAUTAUQUA NY-
101 AM EDT TUE MAY 24 2011

...THE FLASH FLOOD WARNING HAS EXPIRED FOR CATTARAUGUS AND EXTREME 
SOUTHEASTERN CHAUTAUQUA COUNTIES...

WHILE THERE WILL BE A COUPLE MORE SHOWERS AND THUNDERSTORMS OVER THE 
SOUTHERN TIER...ADDITIONAL RAINFALL AMOUNTS SHOULD BE UNDER A 
QUARTER INCH. 

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

LAT...LON 4241 7908 4241 7833 4201 7833 4199 7900
      4199 7909

$$

RSH

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 8:23 PM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	37 min
May 23, 8:45 PM EDT	Special Marine Warning	BUF		30 min
May 23, 8:54 PM EDT	Tornado Warning	BUF	Chautauqua	36 min
May 23, 9:14 PM EDT	Severe Thunderstorm Warning	BUF	Erie	17 min
May 23, 9:24 PM EDT	Flash Flood Warning	BUF	Chautauqua	3 hr
May 23, 10:05 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	25 min
May 23, 10:30 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	45 min
May 23, 10:56 PM EDT	Areal Flood Advisory	BUF	Cattaraugus, Chautauqua, Erie, Wyoming	3 hr
May 23, 11:09 PM EDT	Flash Flood Warning	BUF	Allegany, Cattaraugus, Wyoming	3 hr
May 23, 11:13 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	17 min
May 24, 9:27 AM EDT	Small Craft Advisory	BUF		4 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.