Alert archive / New York / Flash Flood Warnings in 2021

Flash Flood Warning 29, NWS New York, NY

August 22, 20217 counties in New York; 5 counties in New Jersey

NWS New York, NY issued this flash flood warning at Aug 22, 2021, 2:44 PM EDT for 7 counties in New York; 5 counties in New Jersey. It was in force for 3 hr. 16 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 22, 2021, 2:44 PM EDT (18:44 UTC)
Expired
Aug 22, 2021, 5:45 PM EDT
In force
3 hr
Issued by
NWS New York, NY
Area
Storm-based polygon
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, Rockland County, NY, Westchester County, NY

The radar

The Philadelphia radar (KDIX), 100 km from the middle of the area, began a volume at 18:46 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

TimeReportWhereRemark
Aug 22, 2:55 PM EDTFLASH FLOOD1 Ne Elmsford, NYFLOODING ON NY 119 BOTH DIRECTIONS AT KNOLLWOOD RD. NY 100A UNDERPASS CLOSED.
Aug 22, 2:55 PM EDTFLASH FLOODGreenburgh, NYBOTH DIRECTIONS OF NY ROUTE 119 CLOSED AT KNOLLWOOD RD.
Aug 22, 2:59 PM EDTFLASH FLOODHawthorne, NYDOT FLOODING ON TACONIC STATE PARKWAY BOTH DIRECTIONS BETWEEN STEVENS AVE AND COMMERCE STREET ALL LANES CLOSED.
Aug 22, 3:22 PM EDTFLASH FLOOD1 S Pleasantville, NYFLOODING ON SAW MILL RIVER PARKWAY. ALL LANES CLOSED BOTH DIRECTIONS AT MANVILLE RD.
Aug 22, 3:24 PM EDTFLASH FLOODElmsford, NYSPRAIN BROOK PARKWAY NORTH CLOSED DUE TO FLOODING.
Aug 22, 3:32 PM EDTFLASH FLOODElmsford, NYFLOODING ON SAW MILL RIVER PARKWAY NORTHBOUND AT WEST MAIN STREET. ALL LANES BLOCKED.
Aug 22, 3:34 PM EDTFLASH FLOODGreenville, NYBRONX RIVER PARKWAY CLOSED DUE TO FLOODING.
Aug 22, 4:08 PM EDTFLASH FLOODHillcrest, NYN MAIN STREET CLOSED DUE TO FLOODING.
Aug 22, 4:30 PM EDTFLASH FLOODUpper Saddle River, NJCHERRY LANE CLOSED DUE TO FLOODING.
Aug 22, 5:01 PM EDTFLASH FLOODYonkers, NYFLOODING AT CRESTWOOD LAKE APARTMENTS.
Aug 22, 5:15 PM EDTFLASH FLOODNew City, NYWEST CLARKSTOWN ROAD CLOSED DUE TO FLOODING.
Aug 22, 5:19 PM EDTFLASH FLOODWoodcliff Lake, NJPASCACK ROAD FLOODED BETWEEN WASHINGTON AVE AND FREEMONT AVE.
Aug 22, 5:25 PM EDTFLASH FLOODFlatbush, NYPARKSIDE AVENUE FLOODED BETWEEN CONEY ISLAND AVE AND OCEAN AVE.
Aug 22, 5:29 PM EDTFLASH FLOOD1 N Pelham, NYFLOODING ON HUTCHINSON RIVER PARKWAY NORTHBOUND BETWEEN I-95 AND EXIT 13. ALL LANES CLOSED.
Aug 22, 5:43 PM EDTFLASH FLOOD1 W Englewood, NJFOREST AVE BETWEEN DEAN AND VAN BRUNT IS CLOSED DUE TO FLOODING.
Aug 22, 5:51 PM EDTFLASH FLOOD1 Sw Valley Cottage, NYALL RAMPS FROM RT 303 TO WESTBOUND RT 59 ARE CLOSED DUE TO FLOODING. CAR STRANDED.

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, 6.7 hours before the alert went out and 107 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 12:00Z on 2021-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 36 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2021-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 130 square meters per square second.193958Sfc1 km3 km6 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
36 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
563 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
130 m²/s²
0-3 km storm-relative helicity
163 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted.

288 
WGUS51 KOKX 221844
FFWOKX
NJC003-013-017-031-039-NYC005-047-061-081-085-087-119-222145-
/O.NEW.KOKX.FF.W.0029.210822T1844Z-210822T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New York NY
244 PM EDT Sun Aug 22 2021

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...
  Eastern 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...
  Rockland County in southeastern New York...
  Westchester County in southeastern New York...

* Until 545 PM EDT.

* At 244 PM EDT, Doppler radar indicated heavy rain across the 
  warned area. Between 1 and 2 inches of rain have fallen. 
  Additional rainfall amounts of 1 to 3 inches are possible in the 
  warned area. Flash flooding is expected.

  HAZARD...Flash flooding caused by heavy rain.

  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...
  Newark, Jersey City, Yonkers, Paterson, Elizabeth, Flatbush, New 
  Rochelle, Flushing, Passaic, Bayonne, White Plains, Wayne, Mott 
  Haven, Hoboken, Bloomfield, East Tremont, Hackensack, Linden, New 
  City and Orange.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

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 4079 7437 4086 7432 4088 7434 4091 7433
      4091 7427 4099 7430 4115 7424 4134 7381
      4112 7369 4110 7373 4100 7364 4056 7401
      4058 7401 4060 7403 4052 7412 4049 7427
      4059 7420 4061 7433 4073 7438

FLASH FLOOD...RADAR INDICATED

$$

Fig
1 follow-up statement
730 
WGUS71 KOKX 222143
FFSOKX

Flash Flood Statement
National Weather Service New York NY
543 PM EDT Sun Aug 22 2021

NJC003-013-017-031-039-NYC005-047-061-081-085-087-119-222153-
/O.EXP.KOKX.FF.W.0029.000000T0000Z-210822T2145Z/
/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-Rockland NY-Westchester NY-
543 PM EDT Sun Aug 22 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 545 PM EDT THIS AFTERNOON FOR 
BERGEN, ESSEX, HUDSON, EASTERN PASSAIC, UNION, BRONX, KINGS 
(BROOKLYN), NEW YORK (MANHATTAN), QUEENS, RICHMOND (STATEN ISLAND), 
ROCKLAND AND WESTCHESTER 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 PM EDT Monday for portions 
of southern Connecticut, northeast New Jersey and southeast New York.

LAT...LON 4079 7437 4086 7432 4088 7434 4091 7433
      4091 7427 4099 7430 4115 7424 4134 7381
      4112 7369 4110 7373 4100 7364 4056 7401
      4058 7401 4060 7403 4052 7412 4049 7427
      4059 7420 4061 7433 4073 7438

$$

Fig

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 8:46 PM EDTFlash Flood WarningOKXKings, Queens5 hr
Aug 21, 9:03 PM EDTAreal Flood AdvisoryOKXBronx, Kings, Nassau, New York, Queens, Richmond and 1 more87 min
Aug 21, 10:18 PM EDTFlash Flood WarningOKXNew York4 hr
Aug 21, 10:37 PM EDTAreal Flood AdvisoryOKXBronx, Nassau, New York, Queens, Westchester83 min
Aug 21, 10:47 PM EDTFlash Flood WarningOKXBronx, Nassau, New York, Queens103 min
Aug 22, 1:22 AM EDTFlash Flood WarningOKXRichmond117 min
Aug 22, 2:49 AM EDTAreal Flood AdvisoryOKXBronx, Kings, Nassau, New York, Queens86 min
Aug 22, 8:39 AM EDTAreal Flood AdvisoryOKXSuffolk4 hr
Aug 22, 1:32 PM EDTAreal Flood AdvisoryOKXKings, Nassau, Queens118 min
Aug 22, 3:17 PM EDTFlash Flood WarningOKXKings, Nassau, Queens2 hr
Aug 22, 4:32 PM EDTCoastal Flood StatementOKXNassau, Queens, Suffolk, Westchester10 hr
Aug 22, 4:51 PM EDTFlash Flood Warning Considerable damage threatOKXBronx, New York, Orange, Rockland, Westchester6 hr
Aug 22, 5:17 PM EDTSmall Craft AdvisoryOKX42 hr
Aug 22, 12:18 AM EDTFlash Flood WarningOKXEssex, Passaic2 hr
Aug 22, 4:11 AM EDTRiver Flood WarningOKXBergen34 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.