Alert archive / New York / Flash Flood Warnings in 2011

Flash Flood Warning 4, NWS Buffalo, NY

May 13, 2011Livingston County, Ontario County, New York

NWS Buffalo, NY issued this flash flood warning at May 13, 2011, 5:01 PM EDT for Livingston County, Ontario County, New York. It was in force for 116 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: May 13, 2011, 5:01 PM EDT (21:01 UTC)
Expired: May 13, 2011, 6:57 PM EDT
In force: 116 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

Counties Livingston County, NY, Ontario County, NY

The radar

The Buffalo radar (KBUF), 109 km from the middle of the area, began a volume at 21:04 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, 9.0 hours before the alert went out and 105 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: 4 J/kg
Mixed-layer CIN: -229 J/kg
Mixed-layer LCL: 969 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 58 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.

739 
WGUS51 KBUF 132101
FFWBUF
NYC051-069-140000-
/O.NEW.KBUF.FF.W.0004.110513T2101Z-110514T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
501 PM EDT FRI MAY 13 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EXTREME EAST CENTRAL LIVINGSTON COUNTY IN WESTERN NEW YORK...
  SOUTHWESTERN ONTARIO COUNTY IN WESTERN NEW YORK...

* UNTIL 800 PM EDT

* AT 455 PM EDT...FLASH FLOODING WAS REPORTED FROM A THUNDERSTORM    
  OVER THE WARNED AREA. HEAVIEST RAIN HAS FALLEN NEAR NAPLES...WITH  
  RAINFALL AMOUNTS OF AROUND AN INCH AND A HALF. ADDITIONAL RAIN IS  
  LIKELY.

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.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS 
SAFELY. BE ALERT FOR WASHOUTS ON ROADWAYS.

&&

LAT...LON 4257 7763 4268 7759 4266 7736 4258 7735
      4257 7737

$$

APFFEL

2 follow-up statements

520 
WGUS71 KBUF 132207
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
607 PM EDT FRI MAY 13 2011

NYC051-069-140000-
/O.CON.KBUF.FF.W.0004.000000T0000Z-110514T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LIVINGSTON NY-ONTARIO NY-
607 PM EDT FRI MAY 13 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 800 PM EDT FOR
SOUTHWESTERN ONTARIO AND EXTREME EAST CENTRAL LIVINGSTON COUNTIES...

AT 558 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED THE 
INITIAL THUNDERSTORM HAS WEAKENED ACROSS SOUTHERN ONTARIO AND 
LIVINGSTON COUNTIES. HOWEVER THERE ARE STILL STORMS NEARBY...AND 
WITH RAINFALL FROM THE INITIAL STORM...THE WARNING AREA WILL 
CONTINUE TO BE VULNERABLE TO FLOODING. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SPRINGWATER 
AND NAPLES.

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 4257 7763 4268 7759 4266 7736 4258 7735
      4257 7737

$$

APFFEL

268 
WGUS71 KBUF 132257
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
657 PM EDT FRI MAY 13 2011

NYC051-069-132306-
/O.CAN.KBUF.FF.W.0004.000000T0000Z-110514T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LIVINGSTON NY-ONTARIO NY-
657 PM EDT FRI MAY 13 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHWESTERN
ONTARIO AND EXTREME EAST CENTRAL LIVINGSTON COUNTIES...

AT 656 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.

LAT...LON 4257 7763 4268 7759 4266 7736 4258 7735
      4257 7737

$$

APFFEL

The office that day

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

Issued	Product	Office	Counties	Lasted
May 13, 4:02 PM EDT	Areal Flood Advisory	BUF	Cattaraugus, Chautauqua	5 hr
May 13, 4:17 PM EDT	Flash Flood Warning	BUF	Cattaraugus, Chautauqua	3 hr
May 13, 4:25 PM EDT	Areal Flood Advisory	BUF	Allegany	5 hr
May 13, 5:14 PM EDT	Flash Flood Warning	BUF	Allegany	5 hr
May 13, 5:20 PM EDT	Special Weather Statement	BUF	Wyoming	55 min
May 13, 5:36 PM EDT	Flash Flood Warning	BUF	Cattaraugus, Erie, Wyoming	3 hr
May 13, 6:25 PM EDT	Flash Flood Warning	BUF	Livingston, Ontario, Wyoming	105 min

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.