Alert archive / New York / Flash Flood Warnings in 2011

Flash Flood Warning 13, NWS Buffalo, NY

August 1, 2011Livingston County, Ontario County, New York

NWS Buffalo, NY issued this flash flood warning at Aug 1, 2011, 4:12 PM EDT for Livingston County, Ontario County, New York. It was in force for 93 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: Aug 1, 2011, 4:12 PM EDT (20:12 UTC)
Expired: Aug 1, 2011, 5:45 PM EDT
In force: 93 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), 100 km from the middle of the area, began a volume at 20:12 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, 8.2 hours before the alert went out and 96 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: 2422 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 692 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: -0.2
Supercell composite: -1.2

Open this sounding in Storm Lab

The text

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

053 
WGUS51 KBUF 012012
FFWBUF
NYC051-069-012315-
/O.NEW.KBUF.FF.W.0013.110801T2012Z-110801T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
412 PM EDT MON AUG 1 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

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

* UNTIL 715 PM EDT

* AT 407 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM THUNDERSTORMS ALONG A LINE EXTENDING FROM 
  LIVONIA TO NAPLES... MOVING SOUTHEAST AT 10 MPH.

* DOPPLER RADAR INDICATED ONE TO TWO INCHES OF RAIN HAD FALLEN FROM 
  EARLIER STORMS. ANOTHER ONE TO TWO INCHES OF RAIN IS POSSIBLE IN 
  THE WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...


EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

&&

LAT...LON 4281 7776 4289 7771 4270 7735 4258 7736
      4257 7738

$$

LEVAN

1 follow-up statement

066 
WGUS71 KBUF 012145
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
545 PM EDT MON AUG 1 2011

NYC051-069-012154-
/O.CAN.KBUF.FF.W.0013.000000T0000Z-110801T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LIVINGSTON NY-ONTARIO NY-
545 PM EDT MON AUG 1 2011

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

AT 544 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE 
THUNDERSTORMS THAT PROMPTED THE WARNING HAD WEAKENED AND EXITED THE 
AREA...WITH NO FLOODING HAVING BEEN REPORTED. THEREFORE...THE FLASH 
FLOOD WARNING HAS BEEN CANCELLED.

LAT...LON 4281 7776 4289 7771 4270 7735 4258 7736
      4257 7738

$$

JJR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 2:25 AM EDT	Special Marine Warning	BUF		80 min
Aug 1, 2:50 AM EDT	Special Weather Statement	BUF	Orleans	70 min
Aug 1, 3:26 AM EDT	Severe Thunderstorm Warning	BUF	Niagara, Orleans	49 min
Aug 1, 3:56 AM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Niagara, Orleans	64 min
Aug 1, 4:25 AM EDT	Special Marine Warning	BUF		25 min
Aug 1, 4:37 AM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Wyoming	53 min
Aug 1, 4:54 AM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Monroe, Niagara, Orleans	66 min
Aug 1, 5:16 AM EDT	Areal Flood Advisory	BUF	Genesee, Orleans	3 hr
Aug 1, 5:45 AM EDT	Special Weather Statement	BUF	Wyoming	45 min
Aug 1, 6:06 AM EDT	Special Weather Statement	BUF	Allegany	54 min
Aug 1, 6:21 AM EDT	Severe Thunderstorm Warning	BUF	Allegany, Livingston, Wyoming	36 min
Aug 1, 6:47 AM EDT	Special Weather Statement	BUF	Wyoming	43 min
Aug 1, 2:35 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Ontario	45 min
Aug 1, 3:07 PM EDT	Special Weather Statement	BUF	Niagara	53 min
Aug 1, 3:57 PM EDT	Areal Flood Advisory	BUF	Ontario	21 min
Aug 1, 6:06 PM EDT	Severe Thunderstorm Warning	BUF	Ontario	39 min
Aug 1, 6:12 PM EDT	Special Weather Statement	BUF	Genesee, Livingston	63 min
Aug 1, 6:42 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Wyoming	63 min
Aug 1, 6:46 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	59 min
Aug 1, 7:09 PM EDT	Special Weather Statement	BUF	Wyoming	36 min
Aug 1, 7:44 PM EDT	Special Weather Statement	BUF	Wyoming	46 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.