Alert archive / New York / Flash Flood Warnings in 2021
Flash Flood Warning 42, NWS New York, NY
NWS New York, NY issued this flash flood warning at Sep 1, 2021, 11:13 PM EDT for Suffolk County, New York. It was in force for 6 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
- Sep 1, 2021, 11:13 PM EDT (03:13 UTC)
- Expired
- Sep 2, 2021, 4:55 AM EDT
- In force
- 6 hr
- Issued by
- NWS New York, NY
- Area
- Storm-based polygon
- Flood severity
- None
County Suffolk County, NY
The radar
The Brookhaven radar (KOKX), 39 km from the middle of the area, began a volume at 03:18 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 |
|---|---|---|---|
| Sep 2, 1:00 AM EDT | FLASH FLOOD | 1 Sw Port Jefferson, NY | PORT JEFFERSON FIRE DEPARTMENT RESPONDED TO NUMEROUS WATER RESCUE EMERGENCIES. MULTIPLE OCCUPANTS WERE RESCUED BY THE FIRE DEPARTMENTS HIGH WATER UNIT AND SOME OCCUPANTS WERE FOUND ON THE ROOF OF THEIR VEHICLES, OR TRAPPED WITHIN FLOATING VEHICLES. THERE WAS A |
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, 3.2 hours before the alert went out and 39 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
- 123 J/kg
- Mixed-layer CIN
- -47 J/kg
- Mixed-layer LCL
- 512 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 279 m²/s²
- 0-3 km storm-relative helicity
- 456 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
The text
As transmitted.
975
WGUS51 KOKX 020313
FFWOKX
NYC103-020715-
/O.NEW.KOKX.FF.W.0042.210902T0313Z-210902T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New York NY
1113 PM EDT Wed Sep 1 2021
The National Weather Service in Upton has issued a
* Flash Flood Warning for...
Suffolk County in southeastern New York...
* Until 315 AM EDT.
* At 1113 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 3 inches of rain
have already fallen in spots in the warned area. The expected
rainfall rate is 1 to 2 inches in 1 hour. Additional rainfall
amounts of 2 to 4 inches are 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...
Islip, Riverhead, Centereach, Shirley, Medford, Southold,
Ronkonkoma, Manorville, Stony Brook, Patchogue, Middle Island,
Port Jefferson, Wading River, Center Moriches, Mattituck,
Westhampton, Sag Harbor, Bridgehampton, Fishers Island and Plum
Island.
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 4067 7324 4073 7295 4069 7323 4098 7317
4100 7265 4126 7205 4127 7207 4130 7190
4110 7229 4106 7226 4104 7212 4110 7216
4114 7213 4114 7212 4110 7206 4101 7209
4109 7193 4106 7185 4061 7324
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$
Goodman2 follow-up statements
993
WGUS51 KOKX 020708
FFWOKX
NYC103-020915-
/O.EXT.KOKX.FF.W.0042.000000T0000Z-210902T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New York NY
308 AM EDT Thu Sep 2 2021
The National Weather Service in Upton has extended the
* Flash Flood Warning for...
Suffolk County in southeastern New York...
* Until 515 AM EDT.
* At 308 AM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area across the South Fork of Long
Island. Between 1 and 4 inches of rain have fallen and there will
likely be some residual flooding from the earlier heavy rain for
the rest of Suffolk County. The expected rainfall rate is 1 to 2
inches in 1 hour for the ongoing thunderstorms. Additional
rainfall amounts of 1 to 2 inches are possible in the warned area
across the South Fork of Long Island. 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...
Islip, Riverhead, Centereach, Shirley, Medford, Southold,
Ronkonkoma, Manorville, Stony Brook, Patchogue, Middle Island,
Port Jefferson, Wading River, Center Moriches, Mattituck,
Westhampton, Sag Harbor, Bridgehampton, Fishers Island and Plum
Island.
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 4067 7324 4073 7295 4069 7323 4098 7317
4100 7265 4126 7205 4127 7207 4130 7190
4110 7229 4106 7226 4104 7212 4110 7216
4114 7213 4114 7212 4110 7206 4101 7209
4109 7193 4106 7185 4061 7324
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$
JM594
WGUS71 KOKX 020855
FFSOKX
Flash Flood Statement
National Weather Service New York NY
455 AM EDT Thu Sep 2 2021
NYC103-020905-
/O.CAN.KOKX.FF.W.0042.000000T0000Z-210902T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Suffolk NY-
455 AM EDT Thu Sep 2 2021
...FLASH FLOOD WARNING FOR SUFFOLK COUNTY HAS BEEN REPLACED WITH A
FLOOD ADVISORY...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
A Flash Flood Watch remains in effect until 1100 AM EDT Thursday for
portions of southern Connecticut and southeast New York.
LAT...LON 4067 7324 4073 7295 4069 7323 4098 7317
4100 7265 4126 7205 4127 7207 4130 7190
4110 7229 4106 7226 4104 7212 4110 7216
4114 7213 4114 7212 4110 7206 4101 7209
4109 7193 4106 7185 4061 7324
$$
JMThe office that day
Everything else NWS New York, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 8:32 PM EDT | Severe Thunderstorm Warning | OKX | New York, Richmond | 43 min |
| Sep 1, 9:03 PM EDT | Severe Thunderstorm Warning | OKX | Bronx, Kings, Nassau, New York, Queens, Westchester | 42 min |
| Sep 1, 9:06 PM EDT | Tornado Warning | OKX | Bronx, New York, Westchester | 24 min |
| Sep 1, 9:15 PM EDT | Special Marine Warning | OKX | 60 min | |
| Sep 1, 9:25 PM EDT | Special Marine Warning | OKX | 65 min | |
| Sep 1, 9:25 PM EDT | Severe Thunderstorm Warning | OKX | Bronx, Kings, Nassau, New York, Queens, Rockland and 1 more | 65 min |
| Sep 1, 9:28 PM EDT | Flash Flood Warning | OKX | Bronx, Kings, New York, Queens, Westchester | 2 hr |
| Sep 1, 9:34 PM EDT | Special Marine Warning | OKX | 12 min | |
| Sep 1, 9:56 PM EDT | Special Marine Warning | OKX | 34 min | |
| Sep 1, 9:57 PM EDT | Severe Thunderstorm Warning | OKX | Kings, Nassau, Queens | 48 min |
| Sep 1, 10:08 PM EDT | Flash Flood Warning | OKX | Nassau, Westchester | 4 hr |
| Sep 1, 10:09 PM EDT | Special Marine Warning | OKX | 96 min | |
| Sep 1, 10:12 PM EDT | Special Marine Warning | OKX | 20 min | |
| Sep 1, 10:20 PM EDT | Severe Thunderstorm Warning | OKX | Westchester | 55 min |
| Sep 1, 10:26 PM EDT | Special Marine Warning | OKX | 64 min | |
| Sep 1, 10:30 PM EDT | Severe Thunderstorm Warning | OKX | Nassau, Suffolk | 45 min |
| Sep 1, 10:39 PM EDT | Tornado Warning | OKX | Suffolk | 36 min |
| Sep 1, 10:44 PM EDT | Severe Thunderstorm Warning | OKX | Nassau | 46 min |
| Sep 1, 10:47 PM EDT | Special Marine Warning | OKX | 118 min | |
| Sep 1, 10:55 PM EDT | Special Marine Warning | OKX | 45 min | |
| Sep 1, 11:11 PM EDT | Severe Thunderstorm Warning | OKX | Suffolk | 64 min |
| Sep 1, 11:19 PM EDT | Special Marine Warning | OKX | 86 min | |
| Sep 1, 11:54 PM EDT | Flash Flood Warning | OKX | Bronx, Kings, New York, Queens, Richmond, Westchester | 3 hr |
| Sep 2, 12:13 AM EDT | Severe Thunderstorm Warning | OKX | Suffolk | 92 min |
| Sep 2, 12:25 AM EDT | Flash Flood Warning | OKX | Nassau, Queens, Suffolk | 4 hr |
| Sep 2, 12:28 AM EDT | Special Marine Warning | OKX | 92 min | |
| Sep 2, 12:48 AM EDT | River Flood Warning | OKX | Orange, Ulster | 12 hr |
| Sep 2, 1:06 AM EDT | Areal Flood Warning | OKX | Orange, Putnam, Rockland, Westchester | 4 hr |
| Sep 2, 1:50 AM EDT | Special Weather Statement | OKX | Suffolk | 40 min |
| Sep 2, 1:57 AM EDT | Special Marine Warning | OKX | 80 min | |
| Sep 2, 2:30 AM EDT | Areal Flood Warning | OKX | Bronx, Nassau, Putnam, Queens, Rockland, Suffolk and 1 more | 8 hr |
| Sep 2, 2:53 AM EDT | Areal Flood Warning | OKX | Bronx, Kings, Nassau, New York, Queens, Richmond and 1 more | 7 hr |
| Sep 2, 3:50 AM EDT | Rip Current Statement | OKX | Kings, Nassau, Queens, Suffolk | 16 hr |
| Sep 2, 4:38 AM EDT | Areal Flood Advisory | OKX | Nassau, Queens, Suffolk | 3 hr |
| Sep 2, 4:55 AM EDT | Areal Flood Advisory | OKX | Suffolk | 3 hr |
| Sep 2, 5:01 AM EDT | Areal Flood Warning | OKX | Orange, Putnam, Rockland, Westchester | 3 hr |
| Sep 2, 7:49 AM EDT | Areal Flood Advisory | OKX | Orange, Putnam, Rockland, Westchester | 10 hr |
| Sep 2, 10:07 AM EDT | Areal Flood Warning | OKX | Putnam, Rockland, Westchester | 15 hr |
| Sep 2, 10:16 AM EDT | Areal Flood Warning | OKX | Bronx, Nassau, Rockland, Westchester | 25 hr |
| Sep 2, 10:59 AM EDT | Small Craft Advisory | OKX | 19 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.