Alert archive / New York / Flash Flood Warnings in 2021
Flash Flood Warning 20, NWS Buffalo, NY
NWS Buffalo, NY issued this flash flood warning at Aug 21, 2021, 6:00 PM EDT for Cattaraugus County, Chautauqua County, New York. It was in force for 4 hr. 2 reports 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
- Aug 21, 2021, 6:00 PM EDT (22:00 UTC)
- Expired
- Aug 21, 2021, 10:00 PM EDT
- In force
- 4 hr
- Issued by
- NWS Buffalo, NY
- Area
- Storm-based polygon
- Flood severity
- None
Counties Cattaraugus County, NY, Chautauqua County, NY
The radar
The Buffalo radar (KBUF), 99 km from the middle of the area, began a volume at 22:03 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 |
|---|---|---|---|
| Aug 21, 6:55 PM EDT | FLASH FLOOD | Gerry, NY | RT60/GERRY LEVANT RD CLOSED. |
| Aug 21, 7:05 PM EDT | FLASH FLOOD | Falconer, NY | EAST ROSS MILS RD CLOSED. |
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, 10.0 hours before the alert went out and 99 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
- 2 J/kg
- Mixed-layer CIN
- -203 J/kg
- Mixed-layer LCL
- 1298 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 56 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
273
WGUS51 KBUF 212200
FFWBUF
NYC009-013-220200-
/O.NEW.KBUF.FF.W.0020.210821T2200Z-210822T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Buffalo NY
600 PM EDT Sat Aug 21 2021
The National Weather Service in Buffalo has issued a
* Flash Flood Warning for...
West Central Cattaraugus County in western New York...
Southern Chautauqua County in western New York...
* Until 1000 PM EDT.
* At 600 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Some areas have already
received as much as two inches of rain and another one to two
inches of rain will be possible. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Jamestown, Lakewood, Falconer, Clymer, Jamestown West, Long Point
State Park, Chautauqua Institution, Frewsburg, Chautauqua, Busti,
Gerry, Conewango, Ellington, Leon, Randolph, Celoron, Sherman,
Sinclairville, Panama and Cherry Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4231 7899 4207 7900 4201 7928 4200 7970
4219 7966
FLASH FLOOD...RADAR INDICATED
$$
RSH1 follow-up statement
498
WGUS71 KBUF 212342
FFSBUF
Flash Flood Statement
National Weather Service Buffalo NY
742 PM EDT Sat Aug 21 2021
NYC009-013-220200-
/O.CON.KBUF.FF.W.0020.000000T0000Z-210822T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cattaraugus NY-Chautauqua NY-
742 PM EDT Sat Aug 21 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 10 PM EDT THIS
EVENING FOR WEST CENTRAL CATTARAUGUS AND SOUTHERN CHAUTAUQUA
COUNTIES...
At 742 PM EDT, Doppler radar indicated that while the heavy rain is
now diminishing, between 2 and 3.5 inches of rain has fallen across
the warned area, which has lead to flash flooding according to
reports from local law enforcement.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Jamestown, Lakewood, Falconer, Clymer, Jamestown West, Long Point
State Park, Chautauqua Institution, Frewsburg, Chautauqua, Busti,
Gerry, Conewango, Ellington, Leon, Randolph, Celoron, Sherman,
Sinclairville, Panama and Cherry Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4231 7899 4207 7900 4201 7928 4200 7970
4219 7966
FLASH FLOOD...OBSERVED
$$
JJRThe office that day
Everything else NWS Buffalo, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 1:31 PM EDT | Special Weather Statement | BUF | Jefferson | 44 min |
| Aug 21, 2:18 PM EDT | Special Weather Statement | BUF | Jefferson, Lewis | 57 min |
| Aug 21, 3:09 PM EDT | Special Weather Statement | BUF | Jefferson | 66 min |
| Aug 21, 3:13 PM EDT | Special Marine Warning | BUF | 47 min | |
| Aug 21, 5:21 PM EDT | Special Weather Statement | BUF | Chautauqua | 54 min |
| Aug 21, 6:55 PM EDT | Special Weather Statement | BUF | Cattaraugus | 50 min |
Nearby
Flash Flood Warnings in New York, 2021Every flash flood warning in 2021
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.