Alert archive / New York / Flash Flood Warnings in 2012

Flash Flood Warning 19, NWS New York, NY

August 10, 2012Suffolk County, New York

NWS New York, NY issued this flash flood warning at Aug 10, 2012, 2:47 PM EDT for 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
Aug 10, 2012, 2:47 PM EDT (18:47 UTC)
Expired
Aug 10, 2012, 4:15 PM EDT
In force
88 min
Issued by
NWS New York, NY
Area
Storm-based polygon
Flood severity
None

County Suffolk County, NY

The radar

The Brookhaven radar (KOKX), 58 km from the middle of the area, began a volume at 18:48 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

TimeReportWhereRemark
Aug 10, 3:00 PM EDTFLASH FLOODRidge, NYWARDING RIVER MANOR ROAD AND LONG POND ROAD CLOSED 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

Brookhaven, NY (KOKX), launched 12:00Z, 6.8 hours before the alert went out and 58 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2012-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1737 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2012-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 79 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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.

887 
WGUS51 KOKX 101847
FFWOKX
NYC103-102015-
/O.NEW.KOKX.FF.W.0019.120810T1847Z-120810T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
247 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 415 PM EDT...

* AT 243 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
RAINFALL AMOUNTS BETWEEN 1 AND 2 INCHES PER HOUR...WHICH COULD 
RESULT IN FLASH FLOODING ON ROADWAYS. 

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 4107 7185 4072 7289 4097 7291 4099 7263
      4117 7225 4116 7223 4112 7226 4112 7233
      4105 7226 4104 7220 4107 7216 4102 7212
      4102 7211 4103 7211 4108 7211 4113 7213
      4113 7212 4110 7207 4100 7210 4108 7196

$$
SEARS
1 follow-up statement
084 
WGUS71 KOKX 102007
FFSOKX

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

NYC103-102016-
/O.EXP.KOKX.FF.W.0019.000000T0000Z-120810T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUFFOLK NY-
407 PM EDT FRI AUG 10 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 415 PM EDT FOR SUFFOLK
COUNTY...

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

LAT...LON 4107 7185 4072 7289 4097 7291 4099 7263
      4117 7225 4116 7223 4112 7226 4112 7233
      4105 7226 4104 7220 4107 7216 4102 7212
      4102 7211 4103 7211 4108 7211 4113 7213
      4113 7212 4110 7207 4100 7210 4108 7196

$$
SEARS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 3:55 AM EDTSmall Craft AdvisoryOKX30 hr
Aug 10, 9:47 AM EDTAreal Flood AdvisoryOKXOrange58 min
Aug 10, 10:24 AM EDTAreal Flood AdvisoryOKXPutnam, Westchester51 min
Aug 10, 10:49 AM EDTAreal Flood AdvisoryOKXBronx, Kings, Nassau, New York, Orange, Queens and 3 more116 min
Aug 10, 11:02 AM EDTAreal Flood AdvisoryOKXBronx, Kings, Nassau, New York, Orange, Queens and 3 more103 min
Aug 10, 11:48 AM EDTAreal Flood AdvisoryOKXNassau87 min
Aug 10, 12:09 PM EDTAreal Flood AdvisoryOKXPutnam, Westchester81 min
Aug 10, 12:48 PM EDTAreal Flood AdvisoryOKXBronx, Kings, Nassau, New York, Queens, Richmond57 min
Aug 10, 12:53 PM EDTAreal Flood AdvisoryOKXOrange, Rockland52 min
Aug 10, 1:03 PM EDTSpecial Marine WarningOKX27 min
Aug 10, 1:18 PM EDTAreal Flood AdvisoryOKXNassau, Suffolk87 min
Aug 10, 1:21 PM EDTSpecial Weather StatementOKXNassau54 min
Aug 10, 1:33 PM EDTTornado WarningOKXSuffolk8 min
Aug 10, 1:47 PM EDTAreal Flood AdvisoryOKXPutnam, Westchester58 min
Aug 10, 1:56 PM EDTTornado WarningOKXSuffolk19 min
Aug 10, 2:00 PM EDTFlash Flood WarningOKXSuffolk2 hr
Aug 10, 2:11 PM EDTSpecial Marine WarningOKX64 min
Aug 10, 2:14 PM EDTSpecial Marine WarningOKX61 min
Aug 10, 2:23 PM EDTSpecial Weather StatementOKXSuffolk52 min
Aug 10, 2:24 PM EDTAreal Flood AdvisoryOKXSuffolk81 min
Aug 10, 3:07 PM EDTSpecial Marine WarningOKX23 min
Aug 10, 3:10 PM EDTSpecial Marine WarningOKX35 min
Aug 10, 3:16 PM EDTSpecial Marine WarningOKX59 min
Aug 10, 3:19 PM EDTTornado WarningOKXSuffolk26 min
Aug 10, 3:47 PM EDTSpecial Marine WarningOKX43 min
Aug 10, 4:18 PM EDTSpecial Marine WarningOKX57 min
Aug 10, 5:08 PM EDTAreal Flood AdvisoryOKXRockland112 min

Nearby

Flash Flood Warnings in New York, 2012Every 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.