Alert archive / New York / Flash Flood Warnings in 2022

Flash Flood Warning 13, NWS New York, NY

July 21, 2022Nassau County, Suffolk County, New York

NWS New York, NY issued this flash flood warning at Jul 21, 2022, 2:53 PM EDT for Nassau County, Suffolk County, New York. It was in force for 61 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 21, 2022, 2:53 PM EDT (18:53 UTC)
Expired: Jul 21, 2022, 3:54 PM EDT
In force: 61 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

Counties Nassau County, NY, Suffolk County, NY

The radar

The Brookhaven radar (KOKX), 68 km from the middle of the area, began a volume at 18:54 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 21, 3:09 PM EDT	FLASH FLOOD	Plainview, NY	MANETTO HILL ROAD 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 12:00Z, 6.9 hours before the alert went out and 68 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: 715 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 1080 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 133 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.6

Open this sounding in Storm Lab

The text

As transmitted.

699 
WGUS51 KOKX 211853
FFWOKX
NYC059-103-212200-
/O.NEW.KOKX.FF.W.0013.220721T1853Z-220721T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New York NY
253 PM EDT Thu Jul 21 2022

The National Weather Service in Upton has issued a

* Flash Flood Warning for...
  Northern Nassau County in southeastern New York...
  West Central Suffolk County in southeastern New York...

* Until 600 PM EDT.

* At 253 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. The expected rainfall rate is 1 to 1.25 inches in 1 
  hour. Additional rainfall amounts of 0.5 to 1 inch are possible in 
  the warned area. Flash flooding is already occurring.

  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...
  Huntington Station, Plainview, Syosset, Mineola, Huntington, 
  Westbury, Great Neck, Oyster Bay, Hicksville, Melville, Port 
  Washington, Woodbury, Manhasset, Cold Spring Harbor, Brookville, 
  Jericho, New Hyde Park, South Huntington, East Hills and Roslyn 
  Heights.

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.

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.

&&

LAT...LON 4078 7375 4077 7375 4077 7376 4082 7377
      4094 7339 4079 7336 4073 7370 4074 7370
      4075 7370

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-1.25 INCHES IN 1 HOUR

$$

DBR

1 follow-up statement

834 
WGUS71 KOKX 211954
FFSOKX

Flash Flood Statement
National Weather Service New York NY
354 PM EDT Thu Jul 21 2022

NYC059-103-212004-
/O.CAN.KOKX.FF.W.0013.000000T0000Z-220721T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Nassau NY-Suffolk NY-
354 PM EDT Thu Jul 21 2022

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHERN NASSAU AND WEST 
CENTRAL SUFFOLK COUNTIES...

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

LAT...LON 4077 7376 4083 7372 4094 7339 4079 7336
      4074 7370 4075 7370 4078 7375 4077 7375

$$

DBR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 12:32 PM EDT	Severe Thunderstorm Warning	OKX	Bronx, New York, Westchester	43 min
Jul 21, 12:56 PM EDT	Severe Thunderstorm Warning	OKX	Bronx, New York	49 min
Jul 21, 1:07 PM EDT	Special Marine Warning	OKX		53 min
Jul 21, 1:10 PM EDT	Special Weather Statement	OKX	Westchester	50 min
Jul 21, 1:14 PM EDT	Areal Flood Advisory	OKX	Bronx, New York, Westchester	61 min
Jul 21, 1:14 PM EDT	Severe Thunderstorm Warning	OKX	Putnam, Rockland, Westchester	46 min
Jul 21, 1:18 PM EDT	Severe Thunderstorm Warning	OKX	Bronx, Nassau, New York, Queens	42 min
Jul 21, 1:36 PM EDT	Special Weather Statement	OKX	Putnam	24 min
Jul 21, 1:54 PM EDT	Severe Thunderstorm Warning	OKX	Nassau, Suffolk	51 min
Jul 21, 1:59 PM EDT	Severe Thunderstorm Warning	OKX	Putnam, Westchester	46 min
Jul 21, 2:03 PM EDT	Special Weather Statement	OKX	Bronx, New York	42 min
Jul 21, 2:15 PM EDT	Areal Flood Advisory	OKX	Nassau, Queens, Suffolk	90 min
Jul 21, 2:37 PM EDT	Severe Thunderstorm Warning Considerable damage threat	OKX	Nassau, Suffolk	38 min
Jul 21, 3:06 PM EDT	Special Marine Warning	OKX		39 min
Jul 21, 3:14 PM EDT	Severe Thunderstorm Warning	OKX	Suffolk	46 min
Jul 21, 3:41 PM EDT	Special Weather Statement	OKX	Nassau	19 min
Jul 21, 3:57 PM EDT	Special Marine Warning	OKX		9 min
Jul 21, 4:01 PM EDT	Special Weather Statement	OKX	Suffolk	29 min
Jul 21, 4:13 PM EDT	Special Weather Statement	OKX	Suffolk	17 min
Jul 21, 7:14 PM EDT	Rip Current Statement	OKX	Kings, Nassau, Queens, Suffolk	26 hr

Nearby

Flash Flood Warnings in New York, 2022 Every flash flood warning in 2022

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.