Alert archive / New Jersey / Flash Flood Warnings in 2009

Flash Flood Warning 33, NWS Philadelphia/Mount Holly

August 12, 2009Atlantic County, Cumberland County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 12, 2009, 3:17 PM EDT for Atlantic County, Cumberland County, New Jersey. It was in force for 4 hr. 5 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 12, 2009, 3:17 PM EDT (19:17 UTC)
Expired: Aug 12, 2009, 7:15 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Atlantic County, NJ, Cumberland County, NJ

The radar

The Philadelphia radar (KDIX), 68 km from the middle of the area, began a volume at 19:20 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 12, 3:55 PM EDT	FLASH FLOOD	4 Nnw Mays Landing, NJ	FLOODING REPORTED AT INTERSECTION OF ROUTE 50 AND MAIN STREET IN HAMILTON TWP.
Aug 12, 3:56 PM EDT	FLASH FLOOD	Mays Landing, NJ	STREET FLOODING AT INTERSECTION OF 322 AND PAMONA ROAD. ALSO STREET FLOODING AT SOMMERS POINT - MAYS LANDING ROAD HEADING INTO EGG HARBOR TWP.
Aug 12, 4:05 PM EDT	FLASH FLOOD	Millville, NJ	FLOODING ALONG ROUTE 55 - MILEMARKER 27. ALSO FLOODING ALONG NORTHWAY BLVD.
Aug 12, 4:28 PM EDT	FLASH FLOOD	Millville, NJ	WATER RESCUE AT MILL VILLAGE APARTMENT COMPLEX. COMPLEX WAS SURROUNDED BY FLOOD WATERS.
Aug 12, 5:50 PM EDT	HEAVY RAIN 2	Estell Manor, NJ	2.00 INCHES OF RAIN AT TIME OF REPORT.

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

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.3 hours before the alert went out and 111 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: 402 J/kg
Mixed-layer CIN: -103 J/kg
Mixed-layer LCL: 1048 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KPHI 121917
FFWPHI
NJC001-011-122315-
/O.NEW.KPHI.FF.W.0033.090812T1917Z-090812T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
317 PM EDT WED AUG 12 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN ATLANTIC COUNTY IN SOUTHERN NEW JERSEY...
  EAST CENTRAL CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITIES OF...VINELAND...MILLVILLE...

* UNTIL 715 PM EDT

* AT 313 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
SLOW MOVING THUNDERSTORMS WITH TORRENTIAL RAIN ACROSS PORTIONS OF 
THE WARNED AREA. RAINFALL AMOUNTS OF ONE TO THREE INCHES ARE 
POSSIBLE WITH RAINFALL RATES APPROACHING SIX INCHES PER HOUR.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SOUTH
  VINELAND...MIZPAH...ELWOOD-MAGNOLIA...MAYS LANDING AND ELWOOD

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

LAT...LON 3935 7474 3928 7498 3942 7510 3964 7472
      3946 7456

$$

KRUZDLO

1 follow-up statement

000 
WGUS71 KPHI 122310
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
710 PM EDT WED AUG 12 2009

NJC001-011-122317-
/O.EXP.KPHI.FF.W.0033.000000T0000Z-090812T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CUMBERLAND NJ-ATLANTIC NJ-
710 PM EDT WED AUG 12 2009

...THE FLASH FLOOD WARNING WILL EXPIRE AT 715 PM EDT FOR WESTERN
ATLANTIC AND EAST CENTRAL CUMBERLAND COUNTIES...

ALTHOUGH SOME LIGHT TO MODERATE RAIN STILL EXISTS ACROSS THE REGION, 
THE FLOODING THE WARNED AREA EXPERIENCED EARLIER HAS SUBSIDED. THE 
FLOOD WARNING WILL EXPIRE AT 715 PM.

LAT...LON 3935 7474 3929 7499 3942 7510 3964 7472
      3946 7456

$$

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 12:04 PM EDT	Areal Flood Advisory	PHI	Mercer	60 min
Aug 12, 12:47 PM EDT	Flash Flood Warning	PHI	Mercer	3 hr
Aug 12, 1:26 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	22 min
Aug 12, 2:55 PM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	50 min
Aug 12, 3:01 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cumberland	59 min
Aug 12, 3:29 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	60 min
Aug 12, 3:32 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Ocean	118 min
Aug 12, 4:01 PM EDT	Flash Flood Warning	PHI	Atlantic, Cape May	3 hr
Aug 12, 4:16 PM EDT	Flash Flood Warning	PHI	Cumberland, Salem	6 hr
Aug 12, 4:55 PM EDT	Flash Flood Warning	PHI	Salem	3 hr
Aug 12, 5:13 PM EDT	Areal Flood Advisory	PHI	Cape May, Cumberland	2 hr
Aug 12, 6:03 PM EDT	Areal Flood Advisory	PHI	Sussex	4 hr

Nearby

Flash Flood Warnings in New Jersey, 2009 Every flash flood warning in 2009

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.