Alert archive / New York / Flash Flood Warnings in 2021
Flash Flood Warning 24, NWS New York, NY
NWS New York, NY issued this flash flood warning at Aug 21, 2021, 10:47 PM EDT for 4 counties in New York. It was in force for 103 min. 3 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, 10:47 PM EDT (02:47 UTC)
- Expired
- Aug 22, 2021, 12:30 AM EDT
- In force
- 103 min
- Issued by
- NWS New York, NY
- Area
- Storm-based polygon
- Flood severity
- None
Counties Bronx County, NY, Nassau County, NY, New York County, NY, Queens County, NY
The radar
The Brookhaven radar (KOKX), 78 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 21, 10:50 PM EDT | FLASH FLOOD | 1 Se Garden City, NY | MULTIPLE VEHICLES STRANDED IN STREET FLOODING AT FRANKLIN AVE & 2 ST. |
| Aug 21, 10:55 PM EDT | FLASH FLOOD | Garden City, NY | MULTIPLE VEHICLES STRANDED IN STREET FLOODING AT ROCKAWAY AVE & STEWART AVE. |
| Aug 21, 11:20 PM EDT | FLASH FLOOD | 1 Wnw Throgs Neck Bridg, NY | VIDEO ON SOCIAL MEDIA OF CARS STRANDED IN STANDING WATER. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 2.8 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.
- Mixed-layer CAPE
- 1163 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 543 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 75 m²/s²
- 0-3 km storm-relative helicity
- 85 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 1.7
The text
As transmitted.
037
WGUS51 KOKX 220247
FFWOKX
NYC005-059-061-081-220445-
/O.NEW.KOKX.FF.W.0024.210822T0247Z-210822T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New York NY
1047 PM EDT Sat Aug 21 2021
The National Weather Service in Upton has issued a
* Flash Flood Warning for...
Bronx County in southeastern New York...
Western Nassau County in southeastern New York...
New York (Manhattan) County in southeastern New York...
Queens County in southeastern New York...
* Until 1245 AM EDT.
* At 1047 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 3 inches of rain
have fallen. Additional rainfall amounts of 1 to 2 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...
Jamaica, Flushing, Mott Haven, East Tremont, Garden City, Mineola,
Great Neck, Throgs Neck Bridge, Laguardia Airport, RFK Bridge,
Jackson Heights, Astoria, Hempstead, Riverdale, Bayside, Co-op
City, Elmont, Whitestone, Baldwin and Port Washington.
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.
&&
LAT...LON 4086 7395 4092 7392 4090 7386 4091 7385
4089 7384 4088 7379 4089 7378 4089 7376
4088 7375 4087 7375 4086 7375 4088 7373
4088 7371 4085 7367 4072 7357 4066 7360
4066 7369 4074 7385 4074 7395 4079 7392
FLASH FLOOD...RADAR INDICATED
$$
MW2 follow-up statements
528
WGUS71 KOKX 220310
FFSOKX
Flash Flood Statement
National Weather Service New York NY
1110 PM EDT Sat Aug 21 2021
NYC005-059-061-081-220445-
/O.CON.KOKX.FF.W.0024.000000T0000Z-210822T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bronx NY-Nassau NY-New York (Manhattan) NY-Queens NY-
1110 PM EDT Sat Aug 21 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1245 AM EDT SUNDAY
FOR BRONX, WESTERN NASSAU, NEW YORK (MANHATTAN) AND QUEENS
COUNTIES...
At 1110 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain. Between 1 and 3 inches of rain have fallen. Additional
rainfall amounts of 1 to 2 inches are possible in the warned area.
Flash flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Jamaica, Flushing, Mott Haven, East Tremont, Garden City, Mineola,
Great Neck, Throgs Neck Bridge, Laguardia Airport, RFK Bridge,
Jackson Heights, Astoria, Hempstead, Riverdale, Bayside, Co-op
City, Elmont, Whitestone, Baldwin and Port Washington.
At 10:50 PM, Emergency Management reported water rescues and
stranded vehicles in Garden City.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4086 7395 4092 7392 4090 7386 4091 7385
4089 7384 4088 7379 4089 7378 4089 7376
4088 7375 4087 7375 4086 7375 4088 7373
4088 7371 4085 7367 4072 7357 4066 7360
4066 7369 4074 7385 4074 7395 4079 7392
FLASH FLOOD...RADAR INDICATED
$$
MW488
WGUS71 KOKX 220430
FFSOKX
Flash Flood Statement
National Weather Service New York NY
1230 AM EDT Sun Aug 22 2021
NYC005-059-061-081-220440-
/O.CAN.KOKX.FF.W.0024.000000T0000Z-210822T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bronx NY-Nassau NY-New York (Manhattan) NY-Queens NY-
1230 AM EDT Sun Aug 22 2021
...FLASH FLOOD WARNING IS CANCELLED FOR BRONX, WESTERN NASSAU, NEW
YORK (MANHATTAN) AND QUEENS COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flood Watch remains in effect until 800 AM EDT Monday for portions
of southern Connecticut, northeast New Jersey and southeast New York.
LAT...LON 4086 7395 4092 7392 4090 7386 4091 7385
4089 7384 4088 7379 4089 7378 4089 7376
4088 7375 4087 7375 4086 7375 4088 7373
4088 7371 4085 7367 4072 7357 4066 7360
4066 7369 4074 7385 4074 7395 4079 7392
$$
MWThe office that day
Everything else NWS New York, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 8:46 PM EDT | Flash Flood Warning | OKX | Kings, Queens | 5 hr |
| Aug 21, 9:03 PM EDT | Areal Flood Advisory | OKX | Bronx, Kings, Nassau, New York, Queens, Richmond and 1 more | 87 min |
| Aug 21, 10:18 PM EDT | Flash Flood Warning | OKX | New York | 4 hr |
| Aug 21, 10:37 PM EDT | Areal Flood Advisory | OKX | Bronx, Nassau, New York, Queens, Westchester | 83 min |
| Aug 22, 1:22 AM EDT | Flash Flood Warning | OKX | Richmond | 117 min |
| Aug 22, 2:49 AM EDT | Areal Flood Advisory | OKX | Bronx, Kings, Nassau, New York, Queens | 86 min |
| Aug 22, 8:39 AM EDT | Areal Flood Advisory | OKX | Suffolk | 4 hr |
| Aug 22, 1:32 PM EDT | Areal Flood Advisory | OKX | Kings, Nassau, Queens | 118 min |
| Aug 22, 2:44 PM EDT | Flash Flood Warning | OKX | Bronx, Kings, New York, Queens, Richmond, Rockland and 1 more | 3 hr |
| Aug 22, 3:17 PM EDT | Flash Flood Warning | OKX | Kings, Nassau, Queens | 2 hr |
| Aug 22, 4:32 PM EDT | Coastal Flood Statement | OKX | Nassau, Queens, Suffolk, Westchester | 10 hr |
| Aug 22, 4:51 PM EDT | Flash Flood Warning | OKX | Bronx, New York, Orange, Rockland, Westchester | 6 hr |
| Aug 22, 5:17 PM EDT | Small Craft Advisory | OKX | 42 hr |
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.