Alert archive / New York / Flash Flood Warnings in 2021
Flash Flood Warning 18, NWS Buffalo, NY
NWS Buffalo, NY issued this flash flood warning at Aug 10, 2021, 10:47 PM EDT for Jefferson County, Lewis County, New York. It was in force for 5 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
- Aug 10, 2021, 10:47 PM EDT (02:47 UTC)
- Expired
- Aug 11, 2021, 3:48 AM EDT
- In force
- 5 hr
- Issued by
- NWS Buffalo, NY
- Area
- Storm-based polygon
- Flood severity
- None
Counties Jefferson County, NY, Lewis County, NY
The radar
The Ft Drum radar (KTYX), 23 km from the middle of the area, began a volume at 02:48 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
Albany, NY (KALY), launched 00:00Z, 2.8 hours before the alert went out and 196 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
- 159 J/kg
- Mixed-layer CIN
- -71 J/kg
- Mixed-layer LCL
- 984 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 85 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.0
The text
As transmitted.
712
WGUS51 KBUF 110247
FFWBUF
NYC045-049-110845-
/O.NEW.KBUF.FF.W.0018.210811T0247Z-210811T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Buffalo NY
1047 PM EDT Tue Aug 10 2021
The National Weather Service in Buffalo has issued a
* Flash Flood Warning for...
East Central Jefferson County in central New York...
Northern Lewis County in central New York...
* Until 445 AM EDT.
* At 1047 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1.5 and 3 inches of
rain have fallen. Additional rainfall amounts up to 1 inch are
possible in the warned area. 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...
Carthage, Denmark, Copenhagen, Castorland and Indian River.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4388 7579 4410 7532 4403 7526 4393 7535
4382 7572
FLASH FLOOD...RADAR INDICATED
$$
SJW2 follow-up statements
794
WGUS71 KBUF 110614
FFSBUF
Flash Flood Statement
National Weather Service Buffalo NY
214 AM EDT Wed Aug 11 2021
NYC045-049-110845-
/O.CON.KBUF.FF.W.0018.000000T0000Z-210811T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jefferson NY-Lewis NY-
214 AM EDT Wed Aug 11 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 AM EDT EARLY THIS
MORNING FOR EAST CENTRAL JEFFERSON AND NORTHERN LEWIS COUNTIES...
At 214 AM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 2.5 and 3 inches of rain have
fallen. Additional rainfall amounts up to 0.5 inches are possible in
the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Carthage, Denmark, Copenhagen, Castorland and Indian River.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Be aware of your surroundings and do not drive on flooded roads.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4388 7579 4410 7532 4403 7526 4393 7535
4382 7572
FLASH FLOOD...RADAR INDICATED
$$
JLA832
WGUS71 KBUF 110748
FFSBUF
Flash Flood Statement
National Weather Service Buffalo NY
348 AM EDT Wed Aug 11 2021
NYC045-049-110758-
/O.CAN.KBUF.FF.W.0018.000000T0000Z-210811T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jefferson NY-Lewis NY-
348 AM EDT Wed Aug 11 2021
...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL JEFFERSON AND
NORTHERN LEWIS COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 4388 7579 4410 7532 4403 7526 4393 7535
4382 7572
$$
JLAThe office that day
Everything else NWS Buffalo, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 9:29 PM EDT | Special Weather Statement | BUF | Jefferson | 31 min |
| Aug 10, 10:04 PM EDT | Special Weather Statement | BUF | Lewis | 41 min |
| Aug 11, 4:38 AM EDT | Special Weather Statement | BUF | Chautauqua, Erie, Niagara | 52 min |
| Aug 11, 5:37 AM EDT | Special Weather Statement | BUF | Chautauqua | 53 min |
| Aug 11, 5:41 AM EDT | Special Marine Warning | BUF | 64 min | |
| Aug 11, 6:09 AM EDT | Severe Thunderstorm Warning | BUF | Cattaraugus, Chautauqua, Erie | 51 min |
| Aug 11, 6:27 AM EDT | Special Marine Warning | BUF | 93 min | |
| Aug 11, 6:40 AM EDT | Severe Thunderstorm Warning | BUF | Erie, Genesee, Wyoming | 65 min |
| Aug 11, 6:48 AM EDT | Special Marine Warning | BUF | 42 min | |
| Aug 11, 7:16 AM EDT | Severe Thunderstorm Warning | BUF | Allegany, Cattaraugus, Genesee, Livingston, Monroe, Wyoming | 59 min |
| Aug 11, 7:39 AM EDT | Special Weather Statement | BUF | Genesee, Monroe | 81 min |
| Aug 11, 7:46 AM EDT | Severe Thunderstorm Warning | BUF | Genesee, Livingston, Monroe, Ontario, Orleans | 50 min |
| Aug 11, 7:55 AM EDT | Severe Thunderstorm Warning | BUF | Livingston, Monroe, Ontario, Wayne | 50 min |
| Aug 11, 8:09 AM EDT | Special Marine Warning | BUF | 96 min | |
| Aug 11, 8:25 AM EDT | Special Weather Statement | BUF | Wayne | 65 min |
| Aug 11, 9:18 AM EDT | Special Weather Statement | BUF | Oswego | 27 min |
| Aug 11, 1:44 PM EDT | Small Craft Advisory | BUF | 6 hr | |
| Aug 11, 6:52 PM EDT | Special Weather Statement | BUF | Chautauqua | 38 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.