Alert archive / New York / Flash Flood Warnings in 2009

Flash Flood Warning 2, NWS Buffalo, NY

June 26, 2009Monroe County, Ontario County, Wayne County, New York

NWS Buffalo, NY issued this flash flood warning at Jun 26, 2009, 1:32 PM EDT for Monroe County, 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: Jun 26, 2009, 1:32 PM EDT (17:32 UTC)
Expired: Jun 26, 2009, 4:30 PM EDT
In force: 3 hr
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

Counties Monroe County, NY, Ontario County, NY, Wayne County, NY

The radar

The Buffalo radar (KBUF), 81 km from the middle of the area, began a volume at 17:31 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

Time	Report	Where	Remark
Jun 26, 1:50 PM EDT	FLASH FLOOD	Rochester, NY	FLOODING IN BROCKPORT, ROCHESTER, GREECE

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, 5.5 hours before the alert went out and 78 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: 974 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 717 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KBUF 261732
FFWBUF
NYC055-069-117-262030-
/O.NEW.KBUF.FF.W.0002.090626T1732Z-090626T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
132 PM EDT FRI JUN 26 2009

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL MONROE COUNTY IN WESTERN NEW YORK...
  THIS INCLUDES THE CITIES OF...WEBSTER...ROCHESTER...IRONDEQUOIT...
  GREECE...GATES-NORTH GATES...GATES...FAIRPORT...EAST ROCHESTER...
  BROCKPORT...BRIGHTON...
  EXTREME NORTH CENTRAL ONTARIO COUNTY IN WESTERN NEW YORK...
  WESTERN WAYNE COUNTY IN WESTERN NEW YORK...

* UNTIL 430 PM EDT

* AT 130 PM EDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH
  FLOODING FROM THUNDERSTORMS ALONG A LINE EXTENDING FROM MARION TO
  BROCKPORT...OR ALONG A LINE EXTENDING FROM 15 MILES EAST OF WEBSTER
  TO BROCKPORT...MOVING SOUTHEAST AT 10 MPH.

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 4304 7790 4305 7794 4307 7794 4313 7791
      4313 7796 4325 7799 4323 7710 4302 7709
      4302 7790

$$

RSH

1 follow-up statement

000 
WGUS71 KBUF 262031
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
431 PM EDT FRI JUN 26 2009

NYC055-069-117-262041-
/O.EXP.KBUF.FF.W.0002.000000T0000Z-090626T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ONTARIO NY-WAYNE NY-MONROE NY-
431 PM EDT FRI JUN 26 2009

...THE FLASH FLOOD WARNING HAS EXPIRED FOR MONROE...WESTERN WAYNE AND
EXTREME NORTH CENTRAL ONTARIO COUNTIES...

THE FLOODING HAS RECEDED...THUS THE FLOOD WARNING HAS BEEN ALLOWED TO
EXPIRE.

AT 431 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE
THUNDERSTORM THAT PROMPTED THE WARNING HAD EXITED THE AREA...THUS THE
FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT FRIDAY
EVENING FOR WESTERN NEW YORK.

LAT...LON 4304 7790 4305 7794 4307 7794 4313 7791
      4313 7796 4325 7799 4323 7710 4302 7709
      4302 7790

$$

RSH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 25, 8:01 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Erie, Wyoming	31 min
Jun 25, 8:10 PM EDT	Special Marine Warning	BUF		37 min
Jun 25, 8:14 PM EDT	Special Marine Warning	BUF		31 min
Jun 26, 5:43 AM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Wayne	62 min
Jun 26, 12:10 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Monroe	65 min
Jun 26, 12:17 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Livingston	37 min
Jun 26, 12:28 PM EDT	Special Marine Warning	BUF		44 min
Jun 26, 12:41 PM EDT	Severe Thunderstorm Warning	BUF	Monroe, Orleans, Wayne	64 min
Jun 26, 12:50 PM EDT	Special Marine Warning	BUF		55 min
Jun 26, 1:06 PM EDT	Special Marine Warning	BUF		84 min
Jun 26, 1:09 PM EDT	Severe Thunderstorm Warning	BUF	Monroe	66 min
Jun 26, 1:34 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Monroe, Ontario, Wayne	56 min
Jun 26, 1:34 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	29 min
Jun 26, 1:47 PM EDT	Flash Flood Warning	BUF	Allegany	3 hr
Jun 26, 2:23 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Monroe, Ontario	67 min
Jun 26, 2:47 PM EDT	Special Marine Warning	BUF		88 min
Jun 26, 3:11 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson	49 min
Jun 26, 3:46 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Oswego	31 min
Jun 26, 4:13 PM EDT	Special Marine Warning	BUF		30 min
Jun 26, 4:39 PM EDT	Flash Flood Warning	BUF	Wyoming	87 min
Jun 26, 5:27 PM EDT	Special Marine Warning	BUF		32 min

Nearby

Flash Flood Warnings in New York, 2009 Every flash flood warning in 2009

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.