Alert archive / New York / Flash Flood Warnings in 2004
Flash Flood Warning 6, NWS Buffalo, NY
NWS Buffalo, NY issued this flash flood warning at May 21, 2004, 12:56 AM EDT for Allegany County, New York. It was in force for 2 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 21, 2004, 12:56 AM EDT (04:56 UTC)
- Expired
- May 21, 2004, 3:00 AM EDT
- In force
- 2 hr
- Issued by
- NWS Buffalo, NY
- Area
- Counties, with a storm outline in the text
County Allegany County, NY
The radar
The Buffalo radar (KBUF), 113 km from the middle of the area, began a volume at 04:59 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, 4.9 hours before the alert went out and 109 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.
- Mixed-layer CAPE
- 1163 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 875 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 284 m²/s²
- 0-3 km storm-relative helicity
- 339 m²/s²
- Significant tornado parameter
- 2.2
- Supercell composite
- 9.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS51 KBUF 210457 FFWBUF NYC003-210700- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE BUFFALO NY 1256 AM EDT FRI MAY 21 2004 THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A * FLASH FLOOD WARNING FOR... ALLEGANY COUNTY IN WESTERN NEW YORK * UNTIL 300 AM EDT * AT 1253 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM 5 MILES NORTH OF ALFRED... MOVING EAST AT 25 MPH. 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. 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 4236 7798 4214 7801 4198 7757 4219 7746 $$ APB
2 follow-up statements
000 WGUS71 KBUF 210550 FFSBUF NYC003-210700- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE BUFFALO NY 150 AM EDT FRI MAY 21 2004 ...A FLASH FLOOD WARNING CONTINUES UNTIL 300 AM EDT FOR ALLEGANY COUNTY... AT 145 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A THUNDERSTORM PRODUCING HEAVY RAIN. THIS STORM WAS LOCATED 6 MILES SOUTH OF ALFRED...OR ABOUT 13 MILES SOUTHWEST OF HORNELL...MOVING SOUTHEAST AT 20 MPH. THE STORM WAS MOVING OVER AN AREA THAT RECEIVED VERY HEAVY RAIN EARLIER. EAST VALLEY CREEK AND RAILROAD BROOK ARE THE MOST LIKELY AREAS FOR FLOODING. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. LAT...LON 4236 7798 4214 7801 4198 7757 4219 7746 $$ APB
000 WGUS71 KBUF 210652 FFSBUF NYC003-210710- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE BUFFALO NY 252 AM EDT FRI MAY 21 2004 ...THE FLASH FLOOD WARNING FOR ALLEGANY COUNTY WILL BE ALLOWED TO EXPIRE AT 3 AM. THE HEAVY RAIN HAS MOVED OUT OF THE COUNTY. LAT...LON 4236 7798 4214 7801 4198 7757 4219 7746 $$ APB
The office that day
Everything else NWS Buffalo, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 8:29 PM EDT | Severe Thunderstorm Warning | BUF | Genesee | 31 min |
| May 20, 8:40 PM EDT | Severe Thunderstorm Warning | BUF | Livingston | 65 min |
| May 21, 2:25 AM EDT | Severe Thunderstorm Warning | BUF | Cattaraugus, Chautauqua | 50 min |
| May 21, 2:28 AM EDT | Severe Thunderstorm Warning | BUF | Chautauqua | 47 min |
| May 21, 5:45 AM EDT | Flash Flood Warning | BUF | Chautauqua | 3 hr |
Nearby
Flash Flood Warnings in New York, 2004Every flash flood warning in 2004
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.