Alert archive / New York / Flash Flood Warnings in 2021

Flash Flood Warning 43, NWS New York, NY

September 1, 20215 counties in New Jersey; 6 counties in New York

NWS New York, NY issued this flash flood warning at Sep 1, 2021, 11:54 PM EDT for 5 counties in New Jersey; 6 counties in New York. It was in force for 3 hr. 9 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
Sep 1, 2021, 11:54 PM EDT (03:54 UTC)
Expired
Sep 2, 2021, 2:53 AM EDT
In force
3 hr
Issued by
NWS New York, NY
Area
Storm-based polygon
Emergency
Flash flood emergency
Damage threat
Catastrophic
Flood severity
None

Counties Bergen County, NJ, Essex County, NJ, Hudson County, NJ, Passaic County, NJ, Union County, NJ, Bronx County, NY, Kings County, NY, New York County, NY, Queens County, NY, Richmond County, NY, Westchester County, NY

The radar

The Philadelphia radar (KDIX), 98 km from the middle of the area, began a volume at 03:56 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

TimeReportWhereRemark
Sep 2, 12:15 AM EDTFLOOD1 E Pine Brook, NJTHE GAUGE ON THE PASSAIC RIVER AT PINE BROOK (PINN4) REACHED FLOOD STAGE AT 1215 AM 9/2, CRESTING AT 21.66 FEET (MAJOR FLOODING) AT 115 PM 9/3.
Sep 2, 12:15 AM EDTFLASH FLOOD1 E Pompton Plains, NJTHE GAUGE ON THE POMPTON RIVER AT POMPTON PLAINS (PPPN4) REACHED FLOOD STAGE AT 1215 AM 9/2, CRESTING AT 19.58 FEET (MAJOR FLOODING) AT 1145 AM 9/2.
Sep 2, 12:30 AM EDTFLASH FLOOD1 Ne Pequannock, NJCORRECTS PREVIOUS FLASH FLOOD REPORT FROM 1 NE PEQUANNOCK. FLOODING ON STATE HIGHWAY 23 NEAR ALEXANDER AVENUE. ROAD CLOSURES IN PLACE. TIME BASED ON DISPATCH REPORT.
Sep 2, 12:32 AM EDTFLASH FLOOD1 Wnw North Plainfield, NJU.S. HIGHWAY 22 AND WILSON AVENUE CLOSED FROM FLOODING. TIME BASED ON DISPATCH REPORT.
Sep 2, 12:56 AM EDTFLASH FLOOD1 Se Riverdale, NYFLOODING ON I-87 MAJOR DEEGAN EXPRESSWAY NORTHBOUND EXIT 11 - VAN CORTLANDT EXTENSION PARK SOUTH. ALL LANES CLOSED.
Sep 2, 1:01 AM EDTFLASH FLOOD1 Ne Passaic, NJCANAL STREET HAS SEVERAL FEET OF WATER WITH WATER UP TO CAR ROOFS.
Sep 2, 1:02 AM EDTFLASH FLOOD2 Sw Heartland Village, NYFLOODING ON NY 440 SOUTHBOUND ARDEN AVENUE RAMP. ALL LANES CLOSED.
Sep 2, 1:06 AM EDTFLASH FLOOD1 Ne Fordham, NYFLOODING ON BRONX RIVER PARKWAY SOUTHBOUND AT EAST GUN HILL ROAD. ALL LANES BLOCKED.
Sep 2, 2:35 AM EDTFLASH FLOOD1 N Greenwich Village, NYFLOODING ON LINCOLN TUNNEL CENTER TUBE EASTBOUND RAMP TO 36TH STREET. ALL LANES CLOSED.

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, 3.9 hours before the alert went out and 105 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.

Skew-T log-pSkew-T log-p diagram, Brookhaven, NY at 00:00Z on 2021-09-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 123 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2021-09-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 279 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

The text

As transmitted.

801 
WGUS51 KOKX 020354
FFWOKX
NJC003-013-017-031-039-NYC005-047-061-081-085-119-020700-
/O.NEW.KOKX.FF.W.0043.210902T0354Z-210902T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New York NY
1154 PM EDT Wed Sep 1 2021

...FLASH FLOOD EMERGENCY FOR NORTHEAST NEW JERSEY, NYC METRO AND 
SOUTHERN WESTCHESTER...

The National Weather Service in Upton has issued a

* Flash Flood Warning for...
  Bergen County in northeastern New Jersey...
  Essex County in northeastern New Jersey...
  Hudson County in northeastern New Jersey...
  Passaic County in northeastern New Jersey...
  Union County in northeastern New Jersey...
  Bronx County in southeastern New York...
  Kings (Brooklyn) County in southeastern New York...
  New York (Manhattan) County in southeastern New York...
  Queens County in southeastern New York...
  Richmond (Staten Island) County in southeastern New York...
  Southern Westchester County in southeastern New York...

* Until 300 AM EDT.

* At 1154 PM EDT, Doppler radar indicated heavy rain across the 
  warned area. Between 2 and 4 inches of rain have fallen. The 
  expected rainfall rate is 2 to 5 inches in 1 hour. Flash flooding 
  is already occurring.

  This is a FLASH FLOOD EMERGENCY for Northeast New Jersey, NYC 
  Metro and Southern Westchester. This is a PARTICULARLY DANGEROUS 
  SITUATION. SEEK HIGHER GROUND NOW!

  HAZARD...Life threatening flash flooding. Heavy rain producing
           flash flooding.

  SOURCE...Radar.

  IMPACT...This is a PARTICULARLY DANGEROUS SITUATION. SEEK
           HIGHER GROUND NOW! Life threatening flash flooding of
           low water crossings, small creeks and streams, urban
           areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Newark, Jersey City, Jamaica, Yonkers, Paterson, Elizabeth, 
  Flatbush, New Rochelle, Flushing, Passaic, Bayonne, White Plains, 
  Wayne, Mott Haven, Hoboken, Plainfield, Bloomfield, East Tremont, 
  Hackensack and Linden.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now! This is an extremely dangerous and 
life-threatening situation. Do not attempt to travel unless you are 
fleeing an area subject to flooding or under an evacuation order.

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 4120 7437 4099 7389 4106 7377 4095 7367
      4082 7379 4076 7371 4063 7377 4058 7374
      4053 7394 4060 7403 4048 7426 4049 7427
      4056 7422 4059 7420 4060 7446 4075 7436
      4091 7433 4091 7427 4100 7430 4104 7450

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CATASTROPHIC
EXPECTED RAINFALL...2-5 INCHES IN 1 HOUR

$$

Fig
1 follow-up statement
259 
WGUS71 KOKX 020653
FFSOKX

Flash Flood Statement
National Weather Service New York NY
253 AM EDT Thu Sep 2 2021

NJC003-013-017-031-039-NYC005-047-061-081-085-119-020703-
/O.CAN.KOKX.FF.W.0043.000000T0000Z-210902T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bergen NJ-Essex NJ-Hudson NJ-Passaic NJ-Union NJ-Bronx NY-Kings
(Brooklyn) NY-New York (Manhattan) NY-Queens NY-Richmond (Staten
Island) NY-Westchester NY-
253 AM EDT Thu Sep 2 2021

...FLASH FLOOD WARNING FOR BERGEN, ESSEX, HUDSON, PASSAIC, UNION, 
BRONX, KINGS (BROOKLYN), NEW YORK (MANHATTAN), QUEENS, RICHMOND 
(STATEN ISLAND) AND SOUTHERN WESTCHESTER COUNTIES HAS BEEN REPLACED 
WITH A FLOOD WARNING...

LAT...LON 4120 7437 4099 7389 4106 7377 4095 7367
      4082 7379 4076 7371 4063 7377 4058 7374
      4053 7394 4060 7403 4048 7426 4049 7427
      4056 7422 4059 7420 4060 7446 4075 7436
      4091 7433 4091 7427 4100 7430 4104 7450

$$

JM

The office that day

Everything else NWS New York, NY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 1, 8:15 PM EDTSevere Thunderstorm WarningOKXBergen, Essex, Hudson45 min
Sep 1, 8:32 PM EDTSevere Thunderstorm WarningOKXEssex, Hudson, Union43 min
Sep 1, 9:03 PM EDTSevere Thunderstorm WarningOKXBergen, Hudson42 min
Sep 1, 9:25 PM EDTSevere Thunderstorm WarningOKXBergen, Hudson65 min
Sep 2, 1:06 AM EDTAreal Flood WarningOKXBergen4 hr
Sep 2, 2:53 AM EDTAreal Flood WarningOKXBergen, Essex, Hudson, Passaic, Union7 hr
Sep 2, 5:01 AM EDTAreal Flood WarningOKXBergen, Passaic3 hr
Sep 2, 10:16 AM EDTAreal Flood WarningOKXBergen, Essex, Hudson, Passaic, Union25 hr
Sep 1, 9:06 PM EDTTornado WarningOKXBronx, New York, Westchester24 min
Sep 1, 9:15 PM EDTSpecial Marine WarningOKX60 min
Sep 1, 9:25 PM EDTSpecial Marine WarningOKX65 min
Sep 1, 9:28 PM EDTFlash Flood Warning EmergencyCatastrophic damage threatOKXBronx, Kings, New York, Queens, Westchester2 hr
Sep 1, 9:34 PM EDTSpecial Marine WarningOKX12 min
Sep 1, 9:56 PM EDTSpecial Marine WarningOKX34 min
Sep 1, 9:57 PM EDTSevere Thunderstorm WarningOKXKings, Nassau, Queens48 min
Sep 1, 10:08 PM EDTFlash Flood Warning EmergencyCatastrophic damage threatOKXNassau, Westchester4 hr
Sep 1, 10:09 PM EDTSpecial Marine WarningOKX96 min
Sep 1, 10:12 PM EDTSpecial Marine WarningOKX20 min
Sep 1, 10:20 PM EDTSevere Thunderstorm WarningOKXWestchester55 min
Sep 1, 10:26 PM EDTSpecial Marine WarningOKX64 min
Sep 1, 10:30 PM EDTSevere Thunderstorm WarningOKXNassau, Suffolk45 min
Sep 1, 10:39 PM EDTTornado WarningOKXSuffolk36 min
Sep 1, 10:44 PM EDTSevere Thunderstorm WarningOKXNassau46 min
Sep 1, 10:47 PM EDTSpecial Marine WarningOKX118 min
Sep 1, 10:55 PM EDTSpecial Marine WarningOKX45 min
Sep 1, 11:11 PM EDTSevere Thunderstorm WarningOKXSuffolk64 min
Sep 1, 11:13 PM EDTFlash Flood WarningOKXSuffolk6 hr
Sep 1, 11:19 PM EDTSpecial Marine WarningOKX86 min
Sep 2, 12:13 AM EDTSevere Thunderstorm Warning Considerable damage threatOKXSuffolk92 min
Sep 2, 12:25 AM EDTFlash Flood WarningOKXNassau, Queens, Suffolk4 hr
Sep 2, 12:28 AM EDTSpecial Marine WarningOKX92 min
Sep 2, 12:48 AM EDTRiver Flood WarningOKXOrange, Ulster12 hr
Sep 2, 1:50 AM EDTSpecial Weather StatementOKXSuffolk40 min
Sep 2, 1:57 AM EDTSpecial Marine WarningOKX80 min
Sep 2, 2:30 AM EDTAreal Flood WarningOKXBronx, Nassau, Putnam, Queens, Rockland, Suffolk and 1 more8 hr
Sep 2, 3:50 AM EDTRip Current StatementOKXKings, Nassau, Queens, Suffolk16 hr
Sep 2, 4:38 AM EDTAreal Flood AdvisoryOKXNassau, Queens, Suffolk3 hr
Sep 2, 4:55 AM EDTAreal Flood AdvisoryOKXSuffolk3 hr
Sep 2, 7:49 AM EDTAreal Flood AdvisoryOKXOrange, Putnam, Rockland, Westchester10 hr
Sep 2, 10:07 AM EDTAreal Flood WarningOKXPutnam, Rockland, Westchester15 hr
Sep 2, 10:59 AM EDTSmall Craft AdvisoryOKX19 hr

Nearby

Flash Flood Warnings in New York, 2021Flash Flood Warnings in New Jersey, 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.