Alert archive / New York / Flash Flood Warnings in 2012

Flash Flood Warning 29, NWS New York, NY

September 18, 2012Nassau County, Suffolk County, New York

NWS New York, NY issued this flash flood warning at Sep 18, 2012, 9:47 PM EDT for Nassau County, Suffolk County, New York. It was in force for 88 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: Sep 18, 2012, 9:47 PM EDT (01:47 UTC)
Expired: Sep 18, 2012, 11:15 PM EDT
In force: 88 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), 9 km from the middle of the area, began a volume at 01:47 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
Sep 18, 10:45 PM EDT	FLASH FLOOD	1 Wnw Smithtown, NY	MOTORISTS STRANDED IN FLOODED ROADWAY AT DILLMONT DRIVE AND MEADOW ROAD IN KINGS PARK.

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, 1.8 hours before the alert went out and 9 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: 270 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 629 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 667 m²/s²
0-3 km storm-relative helicity: 699 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

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

932 
WGUS51 KOKX 190147
FFWOKX
NYC059-103-190315-
/O.NEW.KOKX.FF.W.0029.120919T0147Z-120919T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
947 PM EDT TUE SEP 18 2012

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A

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

* UNTIL 1115 PM EDT...

* AT 942 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM THUNDERSTORMS ALONG A LINE EXTENDING FROM 9
  MILES NORTH OF ROCKY POINT TO 31 MILES SOUTH OF OCEANSIDE...OR
  ALONG A LINE EXTENDING FROM 10 MILES NORTHEAST OF PORT JEFFERSON TO
  20 MILES EAST OF ASBURY PARK...MOVING NORTHEAST AT 35 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

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 4060 7366 4090 7356 4090 7349 4093 7342
      4091 7341 4094 7336 4091 7321 4093 7316
      4098 7312 4097 7287 4099 7265 4109 7244
      4103 7241 4103 7244 4098 7243 4099 7247
      4096 7244 4097 7238 4087 7235 4062 7321

$$

JP

1 follow-up statement

071 
WGUS71 KOKX 190242
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
1042 PM EDT TUE SEP 18 2012

NYC059-190251-
/O.CAN.KOKX.FF.W.0029.000000T0000Z-120919T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NASSAU NY-
1042 PM EDT TUE SEP 18 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EASTERN NASSAU
COUNTY...

A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT WEDNESDAY
MORNING FOR SOUTHERN CONNECTICUT AND SOUTHEAST NEW YORK.

LAT...LON 4068 7307 4092 7318 4093 7316 4097 7312
      4097 7287 4099 7265 4109 7244 4103 7241
      4103 7244 4098 7243 4099 7247 4096 7244
      4097 7238 4087 7235

$$

NYC103-190315-
/O.CON.KOKX.FF.W.0029.000000T0000Z-120919T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUFFOLK NY-
1042 PM EDT TUE SEP 18 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT FOR
SUFFOLK COUNTY...

AT 1037 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE THUNDERSTORMS PRODUCING FLASH FLOODING.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM 15 MILES NORTH OF SOUTHOLD TO 14
MILES NORTH OF SOUTHOLD...OR OVER CLINTON...MOVING NORTHEAST AT 35
MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT WEDNESDAY
MORNING FOR SOUTHERN CONNECTICUT AND SOUTHEAST NEW YORK.

&&

LAT...LON 4068 7307 4092 7318 4093 7316 4097 7312
      4097 7287 4099 7265 4109 7244 4103 7241
      4103 7244 4098 7243 4099 7247 4096 7244
      4097 7238 4087 7235

$$

JP

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 18, 8:10 PM EDT	Special Marine Warning	OKX		65 min
Sep 18, 8:21 PM EDT	Areal Flood Advisory	OKX	Nassau, Suffolk	54 min
Sep 18, 8:29 PM EDT	Severe Thunderstorm Warning	OKX	Kings, Nassau, Queens, Westchester	46 min
Sep 18, 8:30 PM EDT	Areal Flood Advisory	OKX	Kings, Queens	45 min
Sep 18, 9:04 PM EDT	Areal Flood Advisory	OKX	Suffolk	86 min
Sep 18, 9:09 PM EDT	Severe Thunderstorm Warning	OKX	Nassau, Suffolk	51 min
Sep 18, 9:20 PM EDT	Special Marine Warning	OKX		55 min
Sep 18, 9:26 PM EDT	Special Marine Warning	OKX		94 min
Sep 18, 9:34 PM EDT	Tornado Warning	OKX	Suffolk	26 min
Sep 18, 9:35 PM EDT	Areal Flood Advisory	OKX	Nassau	55 min
Sep 18, 9:58 PM EDT	Severe Thunderstorm Warning	OKX	Suffolk	62 min
Sep 18, 10:18 PM EDT	Special Marine Warning	OKX		57 min
Sep 18, 10:31 PM EDT	Special Marine Warning	OKX		59 min
Sep 18, 10:41 PM EDT	Severe Thunderstorm Warning	OKX	Suffolk	22 min
Sep 18, 10:59 PM EDT	Special Marine Warning	OKX		31 min
Sep 18, 11:12 PM EDT	Special Marine Warning	OKX		63 min
Sep 18, 11:21 PM EDT	Areal Flood Advisory	OKX	Suffolk	54 min
Sep 19, 12:18 AM EDT	Areal Flood Advisory	OKX	Suffolk	117 min
Sep 19, 12:51 AM EDT	Special Marine Warning	OKX		24 min
Sep 19, 3:39 AM EDT	Small Craft Advisory	OKX		14 hr
Sep 19, 5:46 PM EDT	Small Craft Advisory	OKX		22 hr

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.