Alert archive / New York / Flash Flood Warnings in 2011

Flash Flood Warning 20, NWS New York, NY

August 14, 20114 counties in New York

NWS New York, NY issued this flash flood warning at Aug 14, 2011, 10:18 AM EDT for 4 counties in New York. It was in force for 4 hr. 6 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 14, 2011, 10:18 AM EDT (14:18 UTC)
Expired: Aug 14, 2011, 2:15 PM EDT
In force: 4 hr
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

Counties Kings County, NY, Nassau County, NY, Queens County, NY, Suffolk County, NY

The radar

The Brookhaven radar (KOKX), 58 km from the middle of the area, began a volume at 14:21 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
Aug 14, 10:42 AM EDT	FLASH FLOOD	Wantagh, NY	WANTAGH STATE PARKWAY IN BOTH DIRECTIONS AT SUNRISE HIGHWAY CLOSED DUE TO FLOODING
Aug 14, 11:45 AM EDT	FLASH FLOOD	Melville, NY	NORTHERN STATE PARKWAY AT 110 CLOSED DUE TO FLOODING
Aug 14, 11:45 AM EDT	FLASH FLOOD	Merrick, NY	MEADOWBROOK PARKWAY CLOSED AT BABYLON TURNPIKE DUE TO FLOODING
Aug 14, 11:45 AM EDT	FLASH FLOOD	North Amityville, NY	ROUTE 110 AT SOUTHERN STATE PARKWAY CLOSED DUE TO FLOODING
Aug 14, 12:39 PM EDT	FLASH FLOOD	Middle Village, NY	SIGNIFICANT FLOODING AT INTERSECTION OF METOPOLITAN AVENUE AND COOPER AVENUE. WATER HALFWAY UP CAR TIRES IN SPOTS
Aug 14, 1:00 PM EDT	FLASH FLOOD	Seaford, NY	SEAFORD OYSTER BAY EXPRESSWAY IS CLOSED WESTBOUND AT MERRICK ROAD 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

Albany, NY (KALY), launched 12:00Z, 2.3 hours before the alert went out and 222 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: 99 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 657 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

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

075 
WGUS51 KOKX 141418
FFWOKX
NYC047-059-081-103-141615-
/O.NEW.KOKX.FF.W.0020.110814T1418Z-110814T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
1018 AM EDT SUN AUG 14 2011

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NASSAU COUNTY IN SOUTHEAST NEW YORK...
  SUFFOLK COUNTY IN SOUTHEAST NEW YORK...
  QUEENS COUNTY IN SOUTHEAST NEW YORK...
  KINGS (BROOKLYN) COUNTY IN SOUTHEAST NEW YORK...

* UNTIL 1215 PM EDT...

* AT 1013 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM THUNDERSTORMS ALONG A LINE EXTENDING FROM 10
  MILES SOUTH OF CONEY ISLAND TO LONG BEACH TO CORAM...OR ALONG A
  LINE EXTENDING FROM 7 MILES NORTHEAST OF RED BANK TO LONG BEACH TO
  MIDDLE ISLAND...MOVING NORTHEAST AT 10 MPH.

* THUNDERSTORMS PRODUCING FLASH FLOODING WILL BE NEAR...
  OCEANSIDE AND MIDDLE ISLAND BY 1025 AM EDT...
  BROOKHAVEN NATIONAL LABORATORY...HAUPPAUGE AND CENTEREACH BY 1035
  AM EDT...
  FARMINGDALE BY 1045 AM EDT...
  ROCKY POINT AND BALDWIN BY 1050 AM EDT...
  SHEEPSHEAD BAY AND WADING RIVER BY 1100 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 3 INCHES ARE POSSIBLE IN THE 
WARNED AREA OVER THE NEXT TWO HOURS.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

&&

LAT...LON 4056 7392 4062 7376 4063 7376 4057 7398
      4062 7404 4080 7391 4096 7338 4091 7323
      4098 7312 4097 7272 4074 7294 4069 7326
      4064 7323 4070 7297 4067 7302 4060 7356
      4068 7331 4055 7389

$$

MALOIT

3 follow-up statements

429 
WGUS71 KOKX 141517
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
1117 AM EDT SUN AUG 14 2011

NYC047-059-081-103-141615-
/O.CON.KOKX.FF.W.0020.000000T0000Z-110814T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KINGS (BROOKLYN) NY-QUEENS NY-SUFFOLK NY-NASSAU NY-
1117 AM EDT SUN AUG 14 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 PM EDT FOR
NASSAU...SUFFOLK...QUEENS AND KINGS (BROOKLYN) COUNTIES...

AT 1112 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE THUNDERSTORMS PRODUCING FLASH FLOODING.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM 10 MILES SOUTHEAST OF SHEEPSHEAD
BAY TO LEVITTOWN TO ROCKY POINT...OR ALONG A LINE EXTENDING FROM 8
MILES SOUTHEAST OF ROCKAWAY BEACH TO LEVITTOWN TO WADING RIVER...
MOVING NORTHEAST AT 15 MPH.

THUNDERSTORMS PRODUCING FLASH FLOODING WILL BE NEAR...
  FREEPORT...FARMINGDALE...ROCKY POINT AND HAUPPAUGE BY 1115 AM
  EDT...
  LEVITTOWN...SMITHTOWN...OCEANSIDE AND DIX HILLS BY 1120 AM EDT...
  STONY BROOK AND MELVILLE BY 1125 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF UP TO 1 TO 2 ARE POSSIBLE IN THE 
WARNED AREA OVER THE NEXT HOUR.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

&&

LAT...LON 4056 7392 4062 7376 4063 7376 4057 7398
      4062 7404 4080 7391 4096 7338 4091 7323
      4098 7312 4097 7272 4074 7294 4069 7326
      4064 7323 4070 7297 4067 7302 4060 7356
      4068 7331 4055 7389

$$

MALOIT

608 
WGUS51 KOKX 141553
FFWOKX
NYC047-059-081-103-141815-
/O.EXT.KOKX.FF.W.0020.000000T0000Z-110814T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
1153 AM EDT SUN AUG 14 2011

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  NASSAU COUNTY IN SOUTHEAST NEW YORK...
  SUFFOLK COUNTY IN SOUTHEAST NEW YORK...
  QUEENS COUNTY IN SOUTHEAST NEW YORK...
  KINGS (BROOKLYN) COUNTY IN SOUTHEAST NEW YORK...

* UNTIL 215 PM EDT...

* AT 1151 AM EDT...FLASH FLOODING WAS REPORTED FROM THUNDERSTORMS
  ALONG A LINE EXTENDING FROM 32 MILES SOUTH OF CONEY ISLAND TO
  OCEANSIDE TO CORAM...OR ALONG A LINE EXTENDING FROM 11 MILES
  SOUTHEAST OF ASBURY PARK TO LYNBROOK TO CENTEREACH...MOVING
  NORTHEAST AT 20 MPH.

* THUNDERSTORMS PRODUCING FLASH FLOODING WILL BE NEAR...
  WOODMERE...LYNBROOK...BROOKHAVEN NATIONAL LABORATORY AND PORT
  JEFFERSON BY NOON EDT...
  MELVILLE...DIX HILLS...SMITHTOWN AND VALLEY STREAM BY 1205 PM
  EDT...
  COMMACK AND ROCKY POINT BY 1210 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 ARE POSSIBLE IN THE WARNED 
AREA THROUGH 215 PM.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

&&

LAT...LON 4056 7392 4062 7376 4063 7376 4057 7398
      4062 7404 4080 7391 4096 7338 4091 7323
      4098 7312 4097 7272 4074 7294 4069 7326
      4064 7323 4070 7297 4067 7302 4060 7356
      4068 7331 4055 7389

$$

MALOIT

730 
WGUS71 KOKX 141810
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
210 PM EDT SUN AUG 14 2011

NYC047-059-081-103-141820-
/O.EXP.KOKX.FF.W.0020.000000T0000Z-110814T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KINGS (BROOKLYN) NY-QUEENS NY-SUFFOLK NY-NASSAU NY-
210 PM EDT SUN AUG 14 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 215 PM EDT FOR NASSAU...
SUFFOLK...QUEENS AND KINGS (BROOKLYN) COUNTIES...

LAT...LON 4056 7392 4062 7376 4063 7376 4057 7398
      4062 7404 4080 7391 4096 7338 4091 7323
      4098 7312 4097 7272 4074 7294 4069 7326
      4064 7323 4070 7297 4067 7302 4060 7356
      4068 7331 4055 7389

$$

MALOIT

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 2:23 AM EDT	Areal Flood Advisory	OKX	Bronx, Kings, New York, Queens, Richmond	82 min
Aug 14, 2:59 AM EDT	Areal Flood Advisory	OKX	Nassau	91 min
Aug 14, 3:28 AM EDT	Areal Flood Advisory	OKX	Kings, Queens, Richmond	62 min
Aug 14, 4:33 AM EDT	Areal Flood Advisory	OKX	Nassau	87 min
Aug 14, 4:53 AM EDT	Areal Flood Advisory	OKX	Suffolk	112 min
Aug 14, 5:22 AM EDT	Small Craft Advisory	OKX		29 hr
Aug 14, 6:04 AM EDT	Areal Flood Advisory	OKX	New York, Richmond	86 min
Aug 14, 6:08 AM EDT	Areal Flood Advisory	OKX	Nassau, Suffolk	4 hr
Aug 14, 7:40 AM EDT	Areal Flood Advisory	OKX	Kings, Queens	2 hr
Aug 14, 9:20 AM EDT	Flash Flood Watch	OKX	Bronx, Kings, Nassau, New York, Orange, Putnam and 5 more	34 hr
Aug 14, 9:30 AM EDT	Areal Flood Advisory	OKX	Kings, New York, Queens, Richmond	60 min
Aug 14, 10:00 AM EDT	Areal Flood Advisory	OKX	Nassau, Suffolk	23 min
Aug 14, 4:05 PM EDT	Areal Flood Advisory	OKX	Suffolk	55 min
Aug 14, 4:09 PM EDT	Areal Flood Advisory	OKX	Suffolk	66 min
Aug 14, 5:03 PM EDT	Flash Flood Warning	OKX	Suffolk	57 min
Aug 14, 5:31 PM EDT	Areal Flood Advisory	OKX	Bronx, Kings, New York, Queens, Richmond	59 min
Aug 14, 6:06 PM EDT	Areal Flood Advisory	OKX	Suffolk	54 min

Nearby

Flash Flood Warnings in New York, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.