Alert archive / New York / Flash Flood Warnings in 2024
Flash Flood Warning 21, NWS New York, NY
NWS New York, NY issued this flash flood warning at Aug 18, 2024, 5:46 PM EDT for 4 counties in New York; Bergen County, Passaic County, New Jersey. It was in force for 3 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 18, 2024, 5:46 PM EDT (21:46 UTC)
- Expired
- Aug 18, 2024, 8:45 PM EDT
- In force
- 3 hr
- Issued by
- NWS New York, NY
- Area
- Storm-based polygon
- Flood severity
- None
Counties Bergen County, NJ, Passaic County, NJ, Orange County, NY, Putnam County, NY, Rockland County, NY, Westchester County, NY
The radar
The Brookhaven radar (KOKX), 131 km from the middle of the area, began a volume at 21:46 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 18, 6:45 PM EDT | FLASH FLOOD | 1 S Bloomingdale, NJ | Multiple streets closed due to flooding along Glenwild Avenue. |
| Aug 18, 6:45 PM EDT | FLASH FLOOD | 1 S Bloomingdale, NJ | Multiple streets closed due to flooding along Glenwild Avenue. |
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 12:00Z, 9.8 hours before the alert went out and 131 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
- 109 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 582 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 187 m²/s²
- 0-3 km storm-relative helicity
- 205 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
270
WGUS51 KOKX 182146
FFWOKX
NJC003-031-NYC071-079-087-119-190045-
/O.NEW.KOKX.FF.W.0021.240818T2146Z-240819T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New York NY
546 PM EDT Sun Aug 18 2024
The National Weather Service in Upton has issued a
* Flash Flood Warning for...
Northwestern Bergen County in northeastern New Jersey...
Passaic County in northeastern New Jersey...
Orange County in southeastern New York...
Western Putnam County in southeastern New York...
Rockland County in southeastern New York...
Northern Westchester County in southeastern New York...
* Until 845 PM EDT.
* At 546 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1 inch of rain
has fallen. The expected rainfall rate is 1 to 2 inches in 1 hour.
Additional rainfall amounts of 1 to 3 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...
New City, Newburgh, Middletown, West Milford, Peekskill, Monsey,
Ramsey, Ringwood, Haverstraw, Pompton Lakes, Suffern, Port Jervis,
Monroe, Walden, West Point, Warwick, Goshen, Sloatsburg, Cold
Spring and Howells.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Excessive runoff from heavy rainfall will cause flooding of urban
areas, highways, streets and underpasses as well as other drainage
areas and low lying spots.
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 4151 7448 4157 7442 4163 7426 4159 7419
4158 7413 4162 7413 4158 7405 4159 7395
4145 7400 4149 7388 4127 7377 4096 7428
4100 7430 4102 7443 4105 7445 4104 7450
4109 7450 4120 7437 4137 7470 4150 7455
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
JM2 follow-up statements
539
WGUS71 KOKX 182352
FFSOKX
Flash Flood Statement
National Weather Service New York NY
752 PM EDT Sun Aug 18 2024
NJC003-031-NYC071-079-087-119-190045-
/O.CON.KOKX.FF.W.0021.000000T0000Z-240819T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bergen NJ-Passaic NJ-Orange NY-Putnam NY-Rockland NY-Westchester
NY-
752 PM EDT Sun Aug 18 2024
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM EDT THIS
EVENING FOR NORTHWESTERN BERGEN, PASSAIC, SOUTHEASTERN ORANGE,
WESTERN PUTNAM, ROCKLAND AND NORTHERN WESTCHESTER COUNTIES...
At 752 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 0.5 and 1 inch of rain has
fallen. The expected rainfall rate is 1 inch in 1 hour. 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...
New City, West Milford, Peekskill, Monsey, Ramsey, Ringwood,
Haverstraw, Pompton Lakes, Suffern, Monroe, West Point,
Sloatsburg, Cold Spring, Bloomingdale, Greenwood Lake, Pomona,
Harriman, Yorktown Heights, Upper Greenwood Lake and Spring Valley.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Excessive runoff from heavy rainfall will cause flooding of urban
areas, highways, streets and underpasses as well as other drainage
areas and low lying spots.
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 4129 7431 4134 7415 4144 7414 4142 7406
4145 7400 4144 7398 4146 7396 4149 7388
4127 7377 4096 7428 4100 7430 4103 7442
4102 7443 4104 7443 4105 7445 4104 7450
4107 7449 4109 7450 4120 7437
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1 INCH IN 1 HOUR
$$
JM624
WGUS71 KOKX 190051
FFSOKX
Flash Flood Statement
National Weather Service New York NY
851 PM EDT Sun Aug 18 2024
NJC003-031-NYC071-079-087-119-190101-
/O.EXP.KOKX.FF.W.0021.000000T0000Z-240819T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bergen NJ-Passaic NJ-Orange NY-Putnam NY-Rockland NY-Westchester
NY-
851 PM EDT Sun Aug 18 2024
...FLASH FLOOD WARNING HAS EXPIRED FOR NORTHWESTERN BERGEN, PASSAIC,
SOUTHEASTERN ORANGE, WESTERN PUTNAM, ROCKLAND AND NORTHERN
WESTCHESTER COUNTIES...
Flash flooding is no longer posing an imminent threat, but minor
flooding poor drainage and low lying flooding is likely. Please
continue to heed remaining road closures. This warning will likely
be replaced by a Flood Advisory.
A Flood Watch remains in effect until 200 AM EDT for portions of
southern Connecticut and southeast New York.
A Flood Watch remains in effect until 200 AM EDT for portions of
northeast New Jersey and southeast New York.
&&
LAT...LON 4129 7431 4134 7415 4144 7414 4142 7406
4145 7400 4144 7398 4146 7396 4149 7388
4127 7377 4096 7428 4100 7430 4103 7442
4102 7443 4104 7443 4105 7445 4104 7450
4107 7449 4109 7450 4120 7437
$$
NVThe office that day
Everything else NWS New York, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 9:08 PM EDT | Coastal Flood Statement | OKX | Kings, Queens, Richmond | 25 hr |
| Aug 17, 9:08 PM EDT | Coastal Flood Advisory | OKX | Nassau, Westchester | 28 hr |
| Aug 18, 4:07 AM EDT | Areal Flood Advisory | OKX | Bronx, Kings, New York, Queens, Richmond, Westchester | 113 min |
| Aug 18, 6:30 AM EDT | Areal Flood Advisory | OKX | Nassau, Queens, Suffolk | 3 hr |
| Aug 18, 7:07 AM EDT | Areal Flood Advisory | OKX | Westchester | 2 hr |
| Aug 18, 8:29 AM EDT | Areal Flood Advisory | OKX | Bronx, Queens, Westchester | 61 min |
| Aug 18, 9:26 AM EDT | Flash Flood Warning | OKX | Westchester | 6 hr |
| Aug 18, 11:26 AM EDT | Areal Flood Advisory | OKX | Putnam, Westchester | 2 hr |
| Aug 18, 3:31 PM EDT | Areal Flood Advisory | OKX | Westchester | 100 min |
| Aug 18, 4:45 PM EDT | Areal Flood Advisory | OKX | Westchester | 3 hr |
| Aug 18, 5:54 PM EDT | Severe Thunderstorm Warning | OKX | Orange, Rockland | 51 min |
| Aug 18, 6:11 PM EDT | Special Weather Statement | OKX | Richmond | 49 min |
| Aug 18, 6:38 PM EDT | Flash Flood Warning | OKX | Rockland | 3 hr |
| Aug 18, 7:17 PM EDT | Flash Flood Warning | OKX | Bronx, New York, Richmond, Rockland, Westchester | 3 hr |
| Aug 18, 7:24 PM EDT | Special Marine Warning | OKX | 51 min | |
| Aug 18, 7:32 PM EDT | Special Weather Statement | OKX | Kings, Queens, Richmond | 43 min |
| Aug 18, 7:41 PM EDT | Areal Flood Advisory | OKX | Bronx, Kings, Nassau, New York, Queens, Westchester | 3 hr |
| Aug 18, 7:48 PM EDT | Special Marine Warning | OKX | 42 min | |
| Aug 18, 6:28 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Essex, Passaic, Union | 47 min |
Nearby
Flash Flood Warnings in New York, 2024Flash Flood Warnings in New Jersey, 2024Every flash flood warning in 2024
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.