Alert archive / New York / Flash Flood Warnings in 2011

Flash Flood Warning 25, NWS New York, NY

August 18, 2011Essex County, Hudson County, Union County, New Jersey; 5 counties in New York

NWS New York, NY issued this flash flood warning at Aug 18, 2011, 7:22 PM EDT for Essex County, Hudson County, Union County, New Jersey; 5 counties in New York. It was in force for 83 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 18, 2011, 7:22 PM EDT (23:22 UTC)
Expired: Aug 18, 2011, 8:45 PM EDT
In force: 83 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

Counties Essex County, NJ, Hudson County, NJ, Union County, NJ, Kings County, NY, Nassau County, NY, New York County, NY, Queens County, NY, Richmond County, NY

The radar

The Philadelphia radar (KDIX), 87 km from the middle of the area, began a volume at 23:23 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.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.4 hours before the alert went out and 94 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: 372 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 1181 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: -69 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

885 
WGUS51 KOKX 182322
FFWOKX
NJC013-017-039-NYC047-059-061-081-085-190045-
/O.NEW.KOKX.FF.W.0025.110818T2322Z-110819T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
722 PM EDT THU AUG 18 2011

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN NASSAU COUNTY IN SOUTHEAST NEW YORK...
  QUEENS COUNTY IN SOUTHEAST NEW YORK...
  RICHMOND (STATEN ISLAND) COUNTY IN SOUTHEAST NEW YORK...
  KINGS (BROOKLYN) COUNTY IN SOUTHEAST NEW YORK...
  NEW YORK (MANHATTAN) COUNTY IN SOUTHEAST NEW YORK...
  EASTERN UNION COUNTY IN NORTHEAST NEW JERSEY...
  SOUTHEASTERN ESSEX COUNTY IN NORTHEAST NEW JERSEY...
  HUDSON COUNTY IN NORTHEAST NEW JERSEY...

* UNTIL 845 PM EDT...

* AT 718 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM NEAR TODT HILL...MOVING EAST
  AT 25 MPH. EXPECT HEAVY DOWNPOURS WITH THESE STORMS RESULTING IN 
  FLASH FLOODING LOCALLY.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 4062 7419 4063 7420 4059 7421 4069 7430
      4078 7393 4069 7401 4069 7400 4079 7391
      4086 7364 4064 7357 4061 7364 4059 7356
      4056 7391 4057 7392 4062 7376 4063 7376
      4058 7399 4064 7404 4051 7423

$$

PW

2 follow-up statements

713 
WGUS71 KOKX 182347
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
747 PM EDT THU AUG 18 2011

NJC013-017-039-NYC061-085-182356-
/O.CAN.KOKX.FF.W.0025.000000T0000Z-110819T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HUDSON NJ-ESSEX NJ-UNION NJ-NEW YORK (MANHATTAN) NY-
RICHMOND (STATEN ISLAND) NY-
747 PM EDT THU AUG 18 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR RICHMOND (STATEN
ISLAND)...NEW YORK (MANHATTAN)...EASTERN UNION...SOUTHEASTERN ESSEX
AND HUDSON COUNTIES...

THE STORMS PRODUCING HEAVY DOWNPOURS HAVE MOVED TO THE EAST.

LAT...LON 4057 7392 4060 7380 4063 7376 4065 7382
      4062 7381 4065 7385 4063 7392 4061 7388
      4060 7388 4058 7399 4064 7404 4079 7391
      4078 7385 4081 7385 4080 7376 4083 7375
      4086 7364 4064 7357 4061 7364 4059 7356

$$

NYC047-059-081-190045-
/O.CON.KOKX.FF.W.0025.000000T0000Z-110819T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KINGS (BROOKLYN) NY-QUEENS NY-NASSAU NY-
747 PM EDT THU AUG 18 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM EDT FOR
WESTERN NASSAU...QUEENS AND KINGS (BROOKLYN) COUNTIES...

AT 744 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING OVER THE WARNED
AREA.

LAT...LON 4057 7392 4060 7380 4063 7376 4065 7382
      4062 7381 4065 7385 4063 7392 4061 7388
      4060 7388 4058 7399 4064 7404 4079 7391
      4078 7385 4081 7385 4080 7376 4083 7375
      4086 7364 4064 7357 4061 7364 4059 7356

$$

PW

744 
WGUS71 KOKX 190043
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
843 PM EDT THU AUG 18 2011

NYC047-059-081-190053-
/O.EXP.KOKX.FF.W.0025.000000T0000Z-110819T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KINGS (BROOKLYN) NY-QUEENS NY-NASSAU NY-
843 PM EDT THU AUG 18 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 845 PM EDT FOR WESTERN
NASSAU...QUEENS AND KINGS (BROOKLYN) COUNTIES...

THE STORMS ARE MOVING TO THE EAST. AS SUCH...WILL ALLOW THE FLASH 
FLOOD WARNING EXPIRE.

LAT...LON 4057 7392 4060 7380 4063 7376 4065 7382
      4062 7381 4065 7385 4063 7392 4061 7388
      4060 7388 4058 7399 4064 7404 4079 7391
      4078 7385 4081 7385 4080 7376 4083 7375
      4086 7364 4064 7357 4061 7364 4059 7356

$$

PW

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 8:48 AM EDT	Special Weather Statement	OKX	Hudson	42 min
Aug 18, 6:37 PM EDT	Special Weather Statement	OKX	Hudson, Union	53 min
Aug 18, 6:46 PM EDT	Areal Flood Advisory	OKX	Essex, Hudson, Union	59 min
Aug 18, 7:00 PM EDT	Severe Thunderstorm Warning	OKX	Hudson	30 min
Aug 18, 7:14 PM EDT	Severe Thunderstorm Warning	OKX	Essex, Hudson, Union	30 min
Aug 18, 10:11 AM EDT	Special Weather Statement	OKX	Putnam	34 min
Aug 18, 10:41 AM EDT	Special Weather Statement	OKX	Dutchess	34 min
Aug 18, 2:28 PM EDT	Special Weather Statement	OKX	Orange	47 min
Aug 18, 7:08 PM EDT	Special Weather Statement	OKX	Dutchess	22 min
Aug 18, 7:20 PM EDT	Special Marine Warning	OKX		25 min
Aug 18, 7:25 PM EDT	Severe Thunderstorm Warning	OKX	Bronx, Nassau, New York, Queens, Westchester	17 min
Aug 18, 7:33 PM EDT	Special Weather Statement	OKX	Dutchess	27 min

Nearby

Flash Flood Warnings in New York, 2011 Flash Flood Warnings in New Jersey, 2011 Every flash flood warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.