Alert archive / New York / Flash Flood Warnings in 2011

Flash Flood Warning 11, NWS Buffalo, NY

May 23, 2011Allegany County, Cattaraugus County, Wyoming County, New York

NWS Buffalo, NY issued this flash flood warning at May 23, 2011, 11:09 PM EDT for Allegany County, Cattaraugus 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: May 23, 2011, 11:09 PM EDT (03:09 UTC)
Expired: May 24, 2011, 2:00 AM EDT
In force: 3 hr
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

Counties Allegany County, NY, Cattaraugus County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 84 km from the middle of the area, began a volume at 03:09 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, 3.2 hours before the alert went out and 80 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.

376 
WGUS51 KBUF 240309
FFWBUF
NYC003-009-121-240600-
/O.NEW.KBUF.FF.W.0011.110524T0309Z-110524T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
1109 PM EDT MON MAY 23 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ALLEGANY COUNTY IN WESTERN NEW YORK...
  THIS INCLUDES THE CITY OF WELLSVILLE...
  EXTREME EASTERN CATTARAUGUS COUNTY IN WESTERN NEW YORK...
  EXTREME SOUTH CENTRAL WYOMING COUNTY IN WESTERN NEW YORK...

* UNTIL 200 AM EDT

* AT 1100 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  WIDESPREAD SHOWERS AND THUNDERSTORMS WITH HEAVY RAIN OVER THE
  COUNTY...WITH ADDITIONAL STORMS SET TO TRAIN ACROSS THE COUNTY
  DURING THE NEXT FEW HOURS. RAINFALL WILL ALMOST CERTAINLY EXCEED 
  ONE INCH ACROSS A LARGE PORTION OF THE COUNTY WITH SOME 2 INCH
  AMOUNTS LIKELY.  

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

&&

LAT...LON 4254 7834 4254 7807 4251 7804 4251 7785
      4247 7785 4247 7774 4200 7775 4200 7834

$$

RSH

2 follow-up statements

334 
WGUS71 KBUF 240419
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
1219 AM EDT TUE MAY 24 2011

NYC003-009-121-240600-
/O.CON.KBUF.FF.W.0011.000000T0000Z-110524T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLEGANY NY-CATTARAUGUS NY-WYOMING NY-
1219 AM EDT TUE MAY 24 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 AM EDT FOR
EXTREME SOUTH CENTRAL WYOMING...EXTREME EASTERN CATTARAUGUS AND
ALLEGANY COUNTIES...

AT 1208 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE WIDESPREAD SHOWERS AND THUNDERSTORMS OVER THE COUNTY...WITH 
ADDITIONAL SHOWERS MOVING IN FROM THE EAST. 

NATIONAL WEATHER SERVICE DOPPLER RADAR ESTIMATES THAT ONE AND A HALF 
TO TWO INCHES OF RAIN HAS ALREADY FALLEN OVER SOUTHERN PARTS OF THE 
COUNTY. ANOTHER HALF TO ONE INCH OF RAIN WILL BE POSSIBLE.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO RUSHFORD AND
HOUGHTON

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

&&

LAT...LON 4254 7834 4254 7807 4251 7804 4251 7785
      4247 7785 4247 7774 4200 7775 4200 7834

$$

RSH

092 
WGUS71 KBUF 240558
FFSBUF

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

NYC003-009-121-240607-
/O.EXP.KBUF.FF.W.0011.000000T0000Z-110524T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLEGANY NY-CATTARAUGUS NY-WYOMING NY-
158 AM EDT TUE MAY 24 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 200 AM EDT FOR EXTREME
SOUTH CENTRAL WYOMING...EXTREME EASTERN CATTARAUGUS AND ALLEGANY
COUNTIES...

AT 157 AM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE 
THUNDERSTORMS THAT PROMPTED THE WARNING HAVE EXITED THE AREA...THUS 
THE FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE.

LAT...LON 4254 7834 4254 7807 4251 7804 4251 7785
      4247 7785 4247 7774 4200 7775 4200 7834

$$

HIBBERT

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, 9:59 PM EDT	Flash Flood Warning	BUF	Cattaraugus, 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, 11:13 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.