Alert archive / New York / Flash Flood Warnings in 2012

Flash Flood Warning 18, NWS New York, NY

August 10, 2012Suffolk County, New York

NWS New York, NY issued this flash flood warning at Aug 10, 2012, 2:00 PM EDT for Suffolk County, New York. It was in force for 2 hr. 2 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 10, 2012, 2:00 PM EDT (18:00 UTC)
Expired: Aug 10, 2012, 4:00 PM EDT
In force: 2 hr
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

County Suffolk County, NY

The radar

The Brookhaven radar (KOKX), 26 km from the middle of the area, began a volume at 18:00 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 10, 2:09 PM EDT	FLASH FLOOD	Lake Grove, NY	SEVERAL ROADS CLOSED DUE TO FLOODING IN LAKE GROVE... HAUPPAUGE... LAKE RONKONKOMA... AND KINGS PARK. TIME BASED ON RADAR.
Aug 10, 2:12 PM EDT	FLASH FLOOD	Baywood, NY	TWO LANES OF THE SOUTHERN STATE PARKWAY CLOSED IN BOTH DIRECTIONS BETWEEN EXITS 39 AND 40.

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, 6.0 hours before the alert went out and 26 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: 1737 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 539 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

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

397 
WGUS51 KOKX 101800
FFWOKX
NYC103-102000-
/O.NEW.KOKX.FF.W.0018.120810T1800Z-120810T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
200 PM EDT FRI AUG 10 2012

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SUFFOLK COUNTY IN SOUTHEAST NEW YORK...

* UNTIL 400 PM EDT...

* AT 156 PM EDT...THE PUBLIC REPORTED FLASH FLOODING FROM A   
THUNDERSTORM IN THE BABYLON AREA. FLASH FLOODING IS POSSIBLE WITH 
THIS THUNDERSTORM AS IT PROGRESSES TO THE NORTH OVER SUFFOLK COUNTY 
THROUGH 3 PM. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4092 7344 4091 7321 4095 7315 4096 7289
      4076 7289 4074 7294 4072 7289 4071 7295
      4074 7294 4070 7297 4074 7296 4074 7303
      4069 7315 4070 7324 4065 7338 4066 7320
      4062 7341

$$
SEARS

2 follow-up statements

815 
WGUS71 KOKX 101818
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
218 PM EDT FRI AUG 10 2012

NYC103-102000-
/O.CON.KOKX.FF.W.0018.000000T0000Z-120810T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUFFOLK NY-
218 PM EDT FRI AUG 10 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 PM EDT FOR
SUFFOLK COUNTY...

AT 213 PM EDT...THE PUBLIC REPORTED A THUNDERSTORM PRODUCING FLASH 
FLOODING OVER THE WARNED AREA WITH REPORTS OF FLOODING OF ROADWAYS 
IN BABYLON...ISLIP...GREAT RIVER...AND BOHEMIA. FLASH FLOODING 
REMAINS POSSIBLE WITH ANY THUNDERSTORMS PASSING THROUGH SUFFOLK 
COUNTY THROUGH 4 PM. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...
DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM...
EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER
GROUND.

&&

LAT...LON 4092 7344 4091 7321 4095 7315 4096 7289
      4076 7289 4074 7294 4072 7289 4071 7295
      4074 7294 4070 7297 4074 7296 4074 7303
      4069 7315 4070 7324 4065 7338 4066 7320
      4062 7341

$$
SEARS

772 
WGUS71 KOKX 101955
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
355 PM EDT FRI AUG 10 2012

NYC103-102004-
/O.EXP.KOKX.FF.W.0018.000000T0000Z-120810T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUFFOLK NY-
355 PM EDT FRI AUG 10 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 400 PM EDT FOR SUFFOLK
COUNTY...

THE THUNDERSTORMS THAT PROMPTED THE WARNING HAVE MOVED OUT OF THE 
AREA. NO FURTHER FLOODING IS EXPECTED. HOWEVER...STREETS ALREADY 
FLOODED MAY REMAIN FLOODED WITH WATER LEVELS RESIDING SLOWLY. 

LAT...LON 4092 7344 4091 7321 4095 7315 4096 7289
      4076 7289 4074 7294 4072 7289 4071 7295
      4074 7294 4070 7297 4074 7296 4074 7303
      4069 7315 4070 7324 4065 7338 4066 7320
      4062 7341

$$
SEARS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 3:55 AM EDT	Small Craft Advisory	OKX		30 hr
Aug 10, 9:47 AM EDT	Areal Flood Advisory	OKX	Orange	58 min
Aug 10, 10:24 AM EDT	Areal Flood Advisory	OKX	Putnam, Westchester	51 min
Aug 10, 10:49 AM EDT	Areal Flood Advisory	OKX	Bronx, Kings, Nassau, New York, Orange, Queens and 3 more	116 min
Aug 10, 11:02 AM EDT	Areal Flood Advisory	OKX	Bronx, Kings, Nassau, New York, Orange, Queens and 3 more	103 min
Aug 10, 11:48 AM EDT	Areal Flood Advisory	OKX	Nassau	87 min
Aug 10, 12:09 PM EDT	Areal Flood Advisory	OKX	Putnam, Westchester	81 min
Aug 10, 12:48 PM EDT	Areal Flood Advisory	OKX	Bronx, Kings, Nassau, New York, Queens, Richmond	57 min
Aug 10, 12:53 PM EDT	Areal Flood Advisory	OKX	Orange, Rockland	52 min
Aug 10, 1:03 PM EDT	Special Marine Warning	OKX		27 min
Aug 10, 1:18 PM EDT	Areal Flood Advisory	OKX	Nassau, Suffolk	87 min
Aug 10, 1:21 PM EDT	Special Weather Statement	OKX	Nassau	54 min
Aug 10, 1:33 PM EDT	Tornado Warning	OKX	Suffolk	8 min
Aug 10, 1:47 PM EDT	Areal Flood Advisory	OKX	Putnam, Westchester	58 min
Aug 10, 1:56 PM EDT	Tornado Warning	OKX	Suffolk	19 min
Aug 10, 2:11 PM EDT	Special Marine Warning	OKX		64 min
Aug 10, 2:14 PM EDT	Special Marine Warning	OKX		61 min
Aug 10, 2:23 PM EDT	Special Weather Statement	OKX	Suffolk	52 min
Aug 10, 2:24 PM EDT	Areal Flood Advisory	OKX	Suffolk	81 min
Aug 10, 2:47 PM EDT	Flash Flood Warning	OKX	Suffolk	88 min
Aug 10, 3:07 PM EDT	Special Marine Warning	OKX		23 min
Aug 10, 3:10 PM EDT	Special Marine Warning	OKX		35 min
Aug 10, 3:16 PM EDT	Special Marine Warning	OKX		59 min
Aug 10, 3:19 PM EDT	Tornado Warning	OKX	Suffolk	26 min
Aug 10, 3:47 PM EDT	Special Marine Warning	OKX		43 min
Aug 10, 4:18 PM EDT	Special Marine Warning	OKX		57 min
Aug 10, 5:08 PM EDT	Areal Flood Advisory	OKX	Rockland	112 min

Nearby

Flash Flood Warnings in New York, 2012 Every flash flood warning in 2012

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.