Alert archive / New York / Flash Flood Warnings in 2021

Flash Flood Warning 9, NWS New York, NY

July 2, 2021Greater Bridgeport Planning Region, Connecticut; Rockland County, Westchester County, New York; Bergen County, New Jersey

NWS New York, NY issued this flash flood warning at Jul 2, 2021, 8:26 PM EDT for Greater Bridgeport Planning Region, Connecticut; Rockland County, Westchester County, New York; Bergen County, New Jersey. It was in force for 94 min. 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: Jul 2, 2021, 8:26 PM EDT (00:26 UTC)
Expired: Jul 2, 2021, 10:00 PM EDT
In force: 94 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

Counties Greater Bridgeport Planning Region, CT, Bergen County, NJ, Rockland County, NY, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 90 km from the middle of the area, began a volume at 00:28 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
Jul 2, 9:09 PM EDT	FLASH FLOOD	1 N Orangeburg, NY	NY 303 CLOSED BETWEEN SPRUCE ST AND ORANGEBURG RD DUE TO 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 00:00Z, 0.4 hours before the alert went out and 90 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 114 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 457 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 144 m²/s²
0-3 km storm-relative helicity: 188 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

907 
WGUS51 KOKX 030026
FFWOKX
CTC001-NJC003-NYC087-119-030200-
/O.NEW.KOKX.FF.W.0009.210703T0026Z-210703T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New York NY
826 PM EDT Fri Jul 2 2021

The National Weather Service in Upton has issued a

* Flash Flood Warning for...
  Southern Fairfield County in southern Connecticut...
  Northeastern Bergen County in northeastern New Jersey...
  Rockland County in southeastern New York...
  Central Westchester County in southeastern New York...

* Until 1000 PM EDT.

* At 826 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 2.5 inches of 
  rain have fallen. 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...
  Yonkers, Stamford, White Plains, Hackensack, Bergenfield, 
  Ossining, New Canaan, Nanuet, Tarrytown, Mount Kisco, Dobbs Ferry, 
  Nyack, Tappan, Greenwich, Harrison, Englewood, Darien, Scarsdale, 
  Pearl River and Oradell.

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.

Stay away or be swept away. River banks and culverts can become 
unstable and unsafe.

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 4111 7408 4118 7392 4130 7363 4111 7348
      4092 7392 4085 7406 4098 7407

FLASH FLOOD...RADAR INDICATED

$$

DS

2 follow-up statements

331 
WGUS71 KOKX 030117
FFSOKX

Flash Flood Statement
National Weather Service New York NY
917 PM EDT Fri Jul 2 2021

CTC001-NJC003-NYC087-119-030200-
/O.CON.KOKX.FF.W.0009.000000T0000Z-210703T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fairfield CT-Bergen NJ-Rockland NY-Westchester NY-
917 PM EDT Fri Jul 2 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 10 PM EDT THIS 
EVENING FOR SOUTHERN FAIRFIELD, NORTHEASTERN BERGEN, ROCKLAND AND 
CENTRAL WESTCHESTER COUNTIES...

At 917 PM EDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 1.5 and 2.5 inches of rain have 
fallen. 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...
  Yonkers, Stamford, White Plains, Hackensack, Bergenfield, 
  Ossining, New Canaan, Nanuet, Tarrytown, Mount Kisco, Dobbs Ferry, 
  Nyack, Tappan, Greenwich, Harrison, Englewood, Darien, Scarsdale, 
  Pearl River and Oradell.

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.

Stay away or be swept away. River banks and culverts can become 
unstable and unsafe.

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 4111 7408 4118 7392 4130 7363 4111 7348
      4092 7392 4085 7406 4098 7407

FLASH FLOOD...RADAR INDICATED

$$

DS

442 
WGUS71 KOKX 030152
FFSOKX

Flash Flood Statement
National Weather Service New York NY
952 PM EDT Fri Jul 2 2021

CTC001-NJC003-NYC087-119-030202-
/O.EXP.KOKX.FF.W.0009.000000T0000Z-210703T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fairfield CT-Bergen NJ-Rockland NY-Westchester NY-
952 PM EDT Fri Jul 2 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 10 PM EDT THIS EVENING FOR 
SOUTHERN FAIRFIELD, NORTHEASTERN BERGEN, ROCKLAND AND CENTRAL 
WESTCHESTER COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 4111 7408 4118 7392 4130 7363 4111 7348
      4092 7392 4085 7406 4098 7407

$$

DS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 8:06 PM EDT	Areal Flood Advisory	OKX	Greater Bridgeport Planning Region, Naugatuck Valley Planning Region	84 min
Jul 2, 8:03 PM EDT	Areal Flood Advisory	OKX	Bronx, Kings, New York, Queens	87 min
Jul 2, 8:46 PM EDT	Areal Flood Advisory	OKX	Essex, Hudson, Union	69 min
Jul 2, 8:58 PM EDT	Areal Flood Advisory	OKX	Essex, Hudson	62 min

Nearby

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