Alert archive / New Jersey / Flash Flood Warnings in 2012

Flash Flood Warning 38, NWS Philadelphia/Mount Holly

August 26, 2012Cape May County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 26, 2012, 1:42 AM EDT for Cape May County, New Jersey. It was in force for 117 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 26, 2012, 1:42 AM EDT (05:42 UTC)
Expired
Aug 26, 2012, 3:39 AM EDT
In force
117 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

County Cape May County, NJ

The radar

The Dover AFB radar (KDOX), 58 km from the middle of the area, began a volume at 05:43 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

Wallops Is Stn, VA (KWAL), launched 00:00Z, 5.7 hours before the alert went out and 135 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, Wallops Is Stn, VA at 00:00Z on 2012-08-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 697 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 00:00Z on 2012-08-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 130 square meters per square second.1939Sfc1 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
697 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
724 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
130 m²/s²
0-3 km storm-relative helicity
225 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.1

Open this sounding in Storm Lab

The text

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

667 
WGUS51 KPHI 260542
FFWPHI
NJC009-260845-
/O.NEW.KPHI.FF.W.0038.120826T0542Z-120826T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
142 AM EDT SUN AUG 26 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CAPE MAY COUNTY...

* UNTIL 445 AM EDT...

* AT 135 AM EDT...DOPPLER RADAR CONTINUED TO INDICATE VERY HEAVY     
  RAIN OVER SOUTHERN AND CENTRAL CAPE MAY COUNTY.  ALSO, TRAINED     
  WEATHER SPOTTERS REPORTED FLASH FLOODING FROM THUNDERSTORMS IN THE 
  COUNTY.

ADDITIONAL RAINFALL AMOUNTS OF ONE TO THREE INCHES ARE POSSIBLE IN 
THE WARNED AREA.

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. NEVER ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR IN AN
AUTOMOBILE. TURN AROUND DON'T DROWN!

PLEASE REPORT FLOODING...HAIL OR WIND DAMAGE TO THE NATIONAL WEATHER
SERVICE BY CALLING TOLL FREE...1-877-633-6772.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

&&

LAT...LON 3894 7498 3902 7496 3909 7491 3914 7490
      3926 7482 3917 7467 3916 7467 3913 7470
      3910 7470 3901 7478 3899 7478 3893 7487
      3892 7497

$$

NIERENBERG
1 follow-up statement
636 
WGUS71 KPHI 260739
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
339 AM EDT SUN AUG 26 2012

NJC009-260748-
/O.CAN.KPHI.FF.W.0038.000000T0000Z-120826T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CAPE MAY NJ-
339 AM EDT SUN AUG 26 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CAPE MAY COUNTY...


LAT...LON 3894 7498 3902 7496 3909 7491 3914 7490
      3926 7482 3917 7467 3916 7467 3913 7470
      3910 7470 3901 7478 3899 7478 3893 7487
      3892 7497

$$

NIERENBERG

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 25, 8:11 PM EDTSpecial Weather StatementPHICape May94 min
Aug 25, 9:02 PM EDTAreal Flood AdvisoryPHICape May3 hr
Aug 25, 9:24 PM EDTFlash Flood WarningPHICape May74 min
Aug 25, 9:29 PM EDTSpecial Marine WarningPHI91 min
Aug 25, 10:43 PM EDTSpecial Marine WarningPHI92 min
Aug 25, 11:12 PM EDTFlash Flood WarningPHICape May3 hr
Aug 25, 11:39 PM EDTSpecial Marine WarningPHI2 hr
Aug 26, 12:54 AM EDTSpecial Marine WarningPHI2 hr
Aug 26, 1:01 AM EDTSpecial Marine WarningPHI119 min
Aug 26, 6:08 AM EDTRip Current StatementPHIAtlantic, Cape May, Monmouth, Ocean16 hr

Nearby

Flash Flood Warnings in New Jersey, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.