Alert archive / New York / Flash Flood Warnings in 2021

Flash Flood Warning 39, NWS New York, NY

September 1, 20219 counties in New York; Greater Bridgeport Planning Region, Connecticut

NWS New York, NY issued this flash flood warning at Sep 1, 2021, 6:51 PM EDT for 9 counties in New York; Greater Bridgeport Planning Region, Connecticut. It was in force for 5 hr. 41 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, 6:51 PM EDT (22:51 UTC)
Expired
Sep 2, 2021, 12:00 AM EDT
In force
5 hr
Issued by
NWS New York, NY
Area
Storm-based polygon
Flood severity
None

Counties Greater Bridgeport Planning Region, CT, Bronx County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Putnam County, NY, Queens County, NY, Rockland County, NY, Suffolk County, NY, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 67 km from the middle of the area, began a volume at 22:53 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 1, 6:51 PM EDTFLASH FLOOD1 Wsw Parkchester, NYFLOODING ON BRONX RIVER PARKWAY NORTHBOUND AT EAST 172ND STREET. ALL LANES CLOSED.
Sep 1, 7:14 PM EDTFLASH FLOOD1 Sw Yonkers, NYFLOODING ON CROSS COUNTY PARKWAY IN YONKERS. ALL LANES CLOSED BOTH DIRECTIONS.
Sep 1, 7:37 PM EDTFLASH FLOODIrvington, NYFLOODING ON US 9 AREA OF W CLINTON AVENUE. ALL LANES CLOSED BOTH DIRECTIONS.
Sep 1, 7:40 PM EDTFLASH FLOOD1 Nw Flatbush, NYPARKSIDE AVENUE CLOSED DUE TO FLOODING.
Sep 1, 7:54 PM EDTFLASH FLOODCarle Place, NYWESTBURY AVE AT GLEN COVE ROAD IMPASSABLE DUE TO FLOODING.
Sep 1, 8:05 PM EDTFLASH FLOODMonsey, NYELAINE PLACE CLOSED DUE TO FLOODING.
Sep 1, 8:08 PM EDTFLASH FLOODWhite Plains, NYBRONX RIVER PARKWAY SOUTHBOUND IS CLOSED IN WHITE PLAINS DUE TO FLOODING.
Sep 1, 8:24 PM EDTFLASH FLOOD1 Wsw Yonkers, NYASHBURTON AVENUE NEAR SAW MILL RIVER PARKWAY CLOSED DUE TO FLOODING.
Sep 1, 9:30 PM EDTFLASH FLOOD1 Ene Greenville, NYWIDESPREAD ROAD CLOSURE ALONG BRONX RIVER PKWY.
Sep 1, 9:43 PM EDTFLASH FLOOD1 Wnw Nyack, NYSEVERE FLOODING OCCURRING ON THE PALISADES BETWEEN EXITS 10 AND 11.
Sep 1, 9:45 PM EDTFLASH FLOOD1 E Hastings-On-Hudson, NYSOUTHBOUND SAW MILL RIVER PARKWAY FLOODED AT CLARENCE AVENUE.
Sep 1, 10:00 PM EDTFLASH FLOOD1 Ne Irvington, NYEAST SUNNYSIDE LANE FLOODED AND IMPASSIBLE. WATER MORE THAN A FOOT DEEP IN SPOTS. WIDESPREAD FLOODING ELSEWHERE IN THE VILLAGE AS WELL.
Sep 1, 10:00 PM EDTFLASH FLOOD1 W Elmhurst, NYBASEMENT APARTMENT NEAR 64TH STREET AND LAUREL HILL BLVD FLOODED. 3 FATALITIES REPORTED.
Sep 1, 10:00 PM EDTFLASH FLOOD3 Ssw Elmhurst, NYHOMES AND BASEMENTS FLOODING ON WOODBINE STREET IN RIDGEWOOD QUEENS.
Sep 1, 10:02 PM EDTFLASH FLOOD1 Nnw Howard Beach, NYPUBLIC REPORTS BASEMENT FLOODED.
Sep 1, 10:07 PM EDTFLASH FLOOD2 W Elmhurst, NYQUEENS BOULEVARD IN MASPETH/CORONA HAS ABOUT 2 TO 4 FT OF FLOWING WATER RUNNING ACROSS THE STREET. MULTIPLE CARS ARE STRANDED.
Sep 1, 10:09 PM EDTFLASH FLOOD2 N Bay Ridge, NYONE TO TWO FEET OF WATER COVERING THE ROAD AND CARS DISABLED IN THE ROADWAY ON 2ND AVENUE BETWEEN 59TH AND 60TH STREET.
Sep 1, 10:12 PM EDTFLASH FLOODRye, NYSEVERAL CARS DROVE AROUND BARRICADES AND ARE NOW STUCK IN FLOODWATERS.
Sep 1, 10:15 PM EDTHEAVY RAIN 3.255 Ssw New Milford, CT1.25 INCHES IN THE LAST 75 MINUTES
Sep 1, 10:17 PM EDTFLASH FLOOD1 Ssw Washington Height, NYALL SOUTHBOUND LANES OF THE HARLEM RIVER DRIVE ARE CLOSED DUE TO FLOODING AT WEST 166TH STREET.
Sep 1, 10:22 PM EDTFLASH FLOODPort Chester, NYFLOOD WATERSR UP TO THE HOOD OF CARS ON GLEN AVE AND HASECO AVE IN PORT CHESTER.
Sep 1, 10:29 PM EDTFLASH FLOODManhasset, NYCAR STUCK IN FLOODWATERS ON NORTHERN BLVD.
Sep 1, 10:30 PM EDTFLASH FLOOD1 E Parkchester, NYFLOODING IN BASEMENT. WATER 3 FEET DEEP.
Sep 1, 10:30 PM EDTFLASH FLOOD3 W Crown Heights, NYWATER SPILLING INTO HOME THROUGH DOORS AS GROUND DRAINS BECAME OVERWHELMED AND/OR CLOGGED. 2 INCHES OF WATER IN BASEMENT.
Sep 1, 10:38 PM EDTFLASH FLOODPelham, NYHUTCHINSON RIVER PARKWAY CLOSED BOTH DIRECTIONS BETWEEN CROSS COUNTY PARKWAY AND 1-95 BRONX DUE TO FLOODING.
Sep 1, 10:41 PM EDTFLASH FLOOD2 Wnw Jamaica, NYALL EASTBOUND LANES OF THE GRAND CENTRAL PARKWAY CLOSED AT THE VAN WYCK EXPRESSWAY.
Sep 1, 10:45 PM EDTFLASH FLOOD1 Ssw Rye, NYBASEMENT FLOODING IN HOUSE ON THORNE PL IN RYE.
Sep 1, 10:45 PM EDTFLASH FLOOD2 W Darien, CTCOVE ROAD AND SEASIDE AVENUE CLOSED DUE TO FLOODING.
Sep 1, 10:45 PM EDTFLASH FLOODGreenwich Village, NYFLOODING AT THE 28TH STREET/7TH AVENUE STATION ON THE NEW YORK CITY SUBWAY.
Sep 1, 10:50 PM EDTFLASH FLOOD1 E Jamaica, NYWATER ENTERING HOME.
Sep 1, 10:57 PM EDTFLASH FLOODMidtown Manhattan, NYTHE NEW YORK CITY SUBWAY IS EXPERIENCING FLOODING IN MANY AREAS OF ITS SYSTEM. THE MTA REPORTS SERVICE IS EXTREMELY LIMITED TONIGHT DUE TO THE FLOODING.
Sep 1, 11:00 PM EDTFLASH FLOOD1 E Jamaica, NYBASEMENT APARTMENT WALL COLLAPSED DUE TO FLOODING. TWO FATALITIES AND TWO WATER RESCUES WERE REPORTED.
Sep 1, 11:00 PM EDTFLASH FLOOD1 W Ozone Park, NYBASEMENT APARTMENT FLOODED ON RIDGEWOOD AVENUE NEAR AUTUMN AVENUE. 1 FATALITY REPORTED.
Sep 1, 11:00 PM EDTFLASH FLOOD2 E Elmhurst, NYBASEMENT IN HOME ON GRAND CENTRAL PARKWAY, NEAR HORACE HARDING EXPRESSWAY, FLOODED. 1 FATALITY REPORTED.
Sep 1, 11:00 PM EDTFLASH FLOODElmhurst, NYBASEMENT APARTMENT FLOODED ON 84TH STREET, NEAR 55TH ROAD, IN ELMHURST QUEENS. 1 FATALITY REPORTED.
Sep 1, 11:00 PM EDTFLASH FLOODStamford, CTMULTIPLE CARS STRANDED IN FLOOD WATERS WITH RESCUES ONGOING.
Sep 1, 11:28 PM EDTFLASH FLOOD1 Ese Jericho, NYTREE DOWN ON THE NORTHERN STATE PARKWAY WESTBOUND BETWEEN EXIT 27N AND EXIT 26 N.
Sep 1, 11:30 PM EDTFLASH FLOOD2 Nne Jamaica, NY2 TO 3 FOOT DEEP WATER ON ROADWAYS IN FRESH MEADOWS. SEVERAL CARS SUBMERGED.
Sep 1, 11:30 PM EDTFLASH FLOODFairfield, CTFAIRFIELD POLICE IS REPORTING NUMEROUS FLOODED STREETS AND ROAD CLOSURES ACROSS TOWN.
Sep 1, 11:39 PM EDTFLASH FLOODPark Slope, NYSIGNIFICANT FLOODING WITH AT LEAST 2 TO 4 FEET OF FLOWING WATER ON THE ROAD. SEVERAL CARS STRANDED.
Sep 1, 11:44 PM EDTFLASH FLOODYorktown Heights, NYROUTE 202 IS CLOSED NEAR PINE GROVE COURT DUE TO HEAVY FLOODING.

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, 10.9 hours before the alert went out and 67 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 2021-09-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 51 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 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 2021-09-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 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
51 J/kg
Mixed-layer CIN
-80 J/kg
Mixed-layer LCL
1274 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
201 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted.

602 
WGUS51 KOKX 012251
FFWOKX
CTC001-NYC005-047-059-061-079-081-087-103-119-020200-
/O.NEW.KOKX.FF.W.0039.210901T2251Z-210902T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Upton has issued a

* Flash Flood Warning for...
  Fairfield County in southern Connecticut...
  Bronx County in southeastern New York...
  Kings (Brooklyn) County in southeastern New York...
  Nassau County in southeastern New York...
  New York (Manhattan) County in southeastern New York...
  Putnam County in southeastern New York...
  Queens County in southeastern New York...
  Rockland County in southeastern New York...
  Western Suffolk County in southeastern New York...
  Westchester County in southeastern New York...

* Until 1000 PM EDT.

* At 651 PM EDT, Doppler radar indicated heavy rain moving north 
  across the warned area. Between 0.5 and 1 inch of rain has fallen. 
  Additional rainfall amounts of 1 to 2 inches are possible in the 
  warned area. Flash flooding is expected to begin shortly.

  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...
  Islip, Jamaica, Yonkers, Bridgeport, Stamford, Flatbush, Norwalk, 
  Danbury, New Rochelle, Flushing, Brentwood, White Plains, Mott 
  Haven, Levittown, East Tremont, Freeport, Shelton, Valley Stream, 
  Commack and New City.

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 4114 7423 4134 7397 4144 7398 4149 7393
      4153 7353 4156 7353 4143 7322 4141 7319
      4114 7319 4090 7374 4086 7375 4096 7349
      4093 7319 4069 7321 4067 7327 4067 7322
      4061 7322 4056 7401 4068 7405 4100 7389

FLASH FLOOD...RADAR INDICATED

$$

Fig
1 follow-up statement
404 
WGUS51 KOKX 020059
FFWOKX
CTC001-NYC005-047-059-061-079-081-087-103-119-020400-
/O.EXT.KOKX.FF.W.0039.000000T0000Z-210902T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Upton has extended the

* Flash Flood Warning for...
  Fairfield County in southern Connecticut...
  Bronx County in southeastern New York...
  Kings (Brooklyn) County in southeastern New York...
  Nassau County in southeastern New York...
  New York (Manhattan) County in southeastern New York...
  Putnam County in southeastern New York...
  Queens County in southeastern New York...
  Rockland County in southeastern New York...
  Western Suffolk County in southeastern New York...
  Westchester County in southeastern New York...

* Until midnight EDT.

* At 859 PM EDT, Doppler radar indicated heavy rain across the 
  warned area. Between 1.5 and 2.5 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...Life threatening flash flooding. Heavy rain producing
           flash flooding.

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Islip, Jamaica, Yonkers, Bridgeport, Stamford, Flatbush, Norwalk, 
  Danbury, New Rochelle, Flushing, Brentwood, White Plains, Mott 
  Haven, Levittown, East Tremont, Freeport, Shelton, Valley Stream, 
  Commack and New 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.

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 4114 7423 4134 7397 4144 7398 4149 7393
      4153 7353 4156 7353 4143 7322 4141 7319
      4114 7319 4090 7374 4086 7375 4096 7349
      4093 7319 4069 7321 4067 7327 4067 7322
      4061 7322 4056 7401 4068 7405 4100 7389

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

Fig

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 1, 4:05 AM EDTGale WarningOKX31 hr
Sep 1, 5:24 AM EDTCoastal Flood AdvisoryOKXSuffolk17 hr
Sep 1, 9:36 AM EDTSpecial Marine WarningOKX54 min
Sep 1, 10:18 AM EDTSpecial Marine WarningOKX87 min
Sep 1, 10:30 AM EDTSpecial Marine WarningOKX60 min
Sep 1, 11:45 AM EDTSpecial Marine WarningOKX90 min
Sep 1, 1:15 PM EDTSpecial Marine WarningOKX90 min
Sep 1, 1:40 PM EDTAreal Flood AdvisoryOKXOrange, Putnam114 min
Sep 1, 2:43 PM EDTSpecial Marine WarningOKX62 min
Sep 1, 3:34 PM EDTFlash Flood WarningOKXOrange8 hr
Sep 1, 4:43 PM EDTRiver Flood WarningOKXOrange, Rockland43 hr
Sep 1, 5:54 PM EDTFlash Flood Warning EmergencyOKXRichmond6 hr

Nearby

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