Alert archive / New Jersey / Flash Flood Warnings in 2012

Flash Flood Warning 33, NWS Philadelphia/Mount Holly

August 11, 2012Atlantic County, Cape May County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 11, 2012, 4:04 PM EDT for Atlantic County, Cape May County, New Jersey. It was in force for 114 min. 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 11, 2012, 4:04 PM EDT (20:04 UTC)
Expired: Aug 11, 2012, 5:58 PM EDT
In force: 114 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Atlantic County, NJ, Cape May County, NJ

The radar

The Philadelphia radar (KDIX), 82 km from the middle of the area, began a volume at 20:03 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 11, 4:10 PM EDT	FLASH FLOOD	Margate City, NJ	SOME BUILDING FLOODING REPORTED IN MARGATE CITY.
Aug 11, 4:30 PM EDT	FLASH FLOOD	Sea Isle City, NJ	WATER REPORTED ONE FOOT DEEP AT INTERSECTION OF LANDIS AVE AND JFK BLVD IN SEA ISLE CITY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.1 hours before the alert went out and 159 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: 879 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 666 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

210 
WGUS51 KPHI 112004
FFWPHI
NJC001-009-112300-
/O.NEW.KPHI.FF.W.0033.120811T2004Z-120811T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
404 PM EDT SAT AUG 11 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 700 PM EDT...

* AT 359 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM THUNDERSTORMS OVER CAPE MAY AND SOUTHEASTERN
  ATLANTIC COUNTIES.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ATLANTIC
  CITY AND OCEAN CITY.

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 3 INCHES ARE POSSIBLE IN THE 
WARNED AREA BETWEEN 4 PM AND 7 PM. 

THERE WILL PROBABLY BE A SHORT BREAK IN THE HEAVY SHOWERS AND 
THUNDERSTORMS AFFECTING THE WARNING AREA TOWARD 5PM. HOWEVER...
THERE IS ANOTHER BATCH OF HEAVY RAIN SPREADING NORTHWARD FROM 
SOUTHERN DELAWARE THAT SHOULD ARRIVE AROUND 6PM. 

THIS WARNING REPLACES THE PREVIOUSLY ISSUED FLOOD ADVISORY.  

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.

&&

LAT...LON 3935 7441 3932 7450 3925 7460 3917 7467
      3910 7470 3899 7478 3893 7487 3893 7498
      3902 7496 3911 7490 3917 7491 3951 7440
      3949 7438 3950 7433 3945 7430

$$

FORECASTER:  DRAG

3 follow-up statements

099 
WGUS71 KPHI 112053
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
453 PM EDT SAT AUG 11 2012

NJC001-009-112300-
/O.CON.KPHI.FF.W.0033.000000T0000Z-120811T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CAPE MAY NJ-ATLANTIC NJ-
453 PM EDT SAT AUG 11 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM EDT FOR
SOUTHEASTERN ATLANTIC AND CAPE MAY COUNTIES...

AT 446 PM EDT...DOPPLER RADAR ESTIMATES CONTINUE TO INDICATES A BAND 
OF HEAVY SHOWERS AND EMBEDDED THUNDERSTORMS PRODUCING FLASH FLOODING 
OVER CAPE MAY AND SOUTHEASTERN ATLANTIC COUNTIES.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ATLANTIC CITY
AND OCEAN CITY.

AT 445 PM THE MOST CONCENTRATED AREA OF HEAVY RAIN WAS MOVING 
NORTHWARD THROUGH NORTHERN CAPE MAY COUNTY INTO SOUTHEASTERN 
ATLANTIC COUNTY. THERE WILL BE A BREAK IN THE HEAVY RAIN DEVELOPING 
IN NORTHERN CAPE MAY COUNTY SHORTLY AROUND 515 PM.  HOWEVER... 
OCCASIONALLY EXCESSIVE SHORT TERM HEAVY RAINFALL SHOULD CONTINUE IN 
COASTAL ATLANTIC COUNTY NEW JERSEY THROUGH AT LEAST 545 PM.   

THEREAFTER...MORE RAIN...SOME OF IT HEAVY...WITH EMBEDDED 
THUNDERSTORMS...WAS MOVING NORTHWARD FROM MARYLAND AND MAY 
CONTRIBUTE TO FURTHER FLOODING LATER THIS EVENING.   

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

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.

PLEASE REPORT FLOODING...HAIL OR WIND DAMAGE BY CALLING YOUR LOCAL
LAW ENFORCEMENT OFFICIALS OR BY CALLING THE NATIONAL WEATHER SERVICE
TOLL FREE AT...1-877-633-6772.

&&

LAT...LON 3935 7441 3932 7450 3925 7460 3917 7467
      3910 7470 3899 7478 3893 7487 3893 7498
      3902 7496 3911 7490 3917 7491 3951 7440
      3949 7438 3950 7433 3945 7430

$$

DRAG

588 
WGUS71 KPHI 112140
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
540 PM EDT SAT AUG 11 2012

NJC001-009-112300-
/O.CON.KPHI.FF.W.0033.000000T0000Z-120811T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CAPE MAY NJ-ATLANTIC NJ-
540 PM EDT SAT AUG 11 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM EDT FOR
SOUTHEASTERN ATLANTIC AND CAPE MAY COUNTIES...

AT 533 PM EDT...THUNDERSTORMS PRODUCING FLASH FLOODING WAS REPORTED 
EARLIER. THESE ISOLATED STORMS WERE LOCATED ALONG A LINE EXTENDING 
FROM SOMERS POINT TO ATLANTIC CITY...OR ALONG A LINE EXTENDING FROM 
OCEAN CITY TO ATLANTIC CITY...MOVING NORTHEAST AT 25 TO 35 MPH.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ATLANTIC CITY
AND OCEAN CITY.

THERE IS AT LEAST A 30 TO 60 MINUTE BREAK IN THE HEAVY RAIN FOR THE 
WARNING AREA OF CAPE MAY COUNTY AND THE HEAVIEST RAIN SHOULD TAPER 
OFF IN COASTAL ATLANTIC COUNTY AROUND 6 PM. 

MORE RAIN WAS HEADING NORTH FROM DELAWARE...BUT RECENTLY IT HAS 
DECREASED IN ITS INTENSITY.  

NEVERTHELESS...THE WARNING CONTINUES THROUGH 7 PM UNTIL WE ARE 
ASSURED NO FURTHER HEAVY RAIN OCCURS IN THE WARNING AREA AND IT 
GIVES TIME FOR THE CURRENT FLOOD WATERS TO RECEDE. 

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.

PLEASE REPORT FLOODING...HAIL OR WIND DAMAGE BY CALLING YOUR LOCAL
LAW ENFORCEMENT OFFICIALS OR BY CALLING THE NATIONAL WEATHER SERVICE
TOLL FREE AT...1-877-633-6772.

&&

LAT...LON 3935 7441 3932 7450 3925 7460 3917 7467
      3910 7470 3899 7478 3893 7487 3893 7498
      3902 7496 3911 7490 3917 7491 3951 7440
      3949 7438 3950 7433 3945 7430

$$

FORECASTER:  DRAG

358 
WGUS71 KPHI 112158
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
558 PM EDT SAT AUG 11 2012

NJC001-009-112205-
/O.CAN.KPHI.FF.W.0033.000000T0000Z-120811T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CAPE MAY NJ-ATLANTIC NJ-
558 PM EDT SAT AUG 11 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHEASTERN
ATLANTIC AND CAPE MAY COUNTIES...

THE WATERS FROM THE EARLIER HEAVY RAINS ARE RECEDING AND FLOOD WATERS
SHOULD NO LONGER POSE A THREAT TO LIFE OR PROPERTY. THEREFORE...THE 
FLASH FLOOD WARNING HAS BEEN CANCELLED.

EVEN THOUGH THE POCKETS OF FLOOD WATERS ARE RECEDING...THERE MAY BE 
SOME MINOR FLOODING PROBLEMS THROUGH 7 PM.

THERE WILL BE MORE SHOWERS AND POSSIBLE THUNDERSTORMS LATER TONIGHT. 
BE ALERT FOR THE POSSIBILITY OF RENEWED POOR DRAINAGE FLOODING LATER 
TONIGHT IF THUNDERSTORMS REDEVELOP.  

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ATLANTIC CITY
AND OCEAN CITY.

LAT...LON 3935 7441 3932 7450 3925 7460 3917 7467
      3910 7470 3899 7478 3893 7487 3893 7498
      3902 7496 3911 7490 3917 7491 3951 7440
      3949 7438 3950 7433 3945 7430

$$

FORECASTER: DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 11:51 AM EDT	Special Weather Statement	PHI	Sussex, Warren	54 min
Aug 11, 11:57 AM EDT	Special Weather Statement	PHI	Cape May, Cumberland	63 min
Aug 11, 1:06 PM EDT	Special Weather Statement	PHI	Cumberland	39 min
Aug 11, 1:38 PM EDT	Special Marine Warning	PHI		37 min
Aug 11, 1:45 PM EDT	Special Weather Statement	PHI	Cape May	45 min
Aug 11, 2:12 PM EDT	Special Weather Statement	PHI	Cape May	48 min
Aug 11, 2:35 PM EDT	Special Weather Statement	PHI	Cape May	25 min
Aug 11, 3:01 PM EDT	Special Weather Statement	PHI	Cape May	44 min
Aug 11, 3:10 PM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May, Ocean	62 min
Aug 11, 3:25 PM EDT	Special Marine Warning	PHI		35 min
Aug 11, 5:20 PM EDT	Special Weather Statement	PHI	Atlantic	40 min
Aug 11, 6:42 PM EDT	Special Weather Statement	PHI	Salem	33 min
Aug 11, 6:49 PM EDT	Special Weather Statement	PHI	Morris	26 min
Aug 11, 6:52 PM EDT	Special Weather Statement	PHI	Somerset	23 min
Aug 11, 7:17 PM EDT	Special Weather Statement	PHI	Gloucester	28 min
Aug 11, 7:19 PM EDT	Special Weather Statement	PHI	Sussex	26 min
Aug 11, 7:56 PM EDT	Special Weather Statement	PHI	Mercer	34 min

Nearby

Flash Flood Warnings in New Jersey, 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.