Alert archive / New Jersey / Flash Flood Warnings in 2011

Flash Flood Warning 54, NWS Philadelphia/Mount Holly

September 8, 2011Cumberland County, Gloucester County, Salem County, New Jersey; Delaware County, Montgomery County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 8, 2011, 1:25 AM EDT for Cumberland County, Gloucester County, Salem County, New Jersey; Delaware County, Montgomery County, Philadelphia County, Pennsylvania. It was in force for 7 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Sep 8, 2011, 1:25 AM EDT (05:25 UTC)
Expired
Sep 8, 2011, 8:44 AM EDT
In force
7 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 76 km from the middle of the area, began a volume at 05:28 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, 5.4 hours before the alert went out and 202 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 2011-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 791 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 2011-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 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
791 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
740 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
109 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

Open this sounding in Storm Lab

The text

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

277 
WGUS51 KPHI 080525
FFWPHI
NJC011-015-033-PAC045-091-101-080915-
/O.NEW.KPHI.FF.W.0054.110908T0525Z-110908T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
125 AM EDT THU SEP 8 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SALEM COUNTY...
  CUMBERLAND COUNTY...
  GLOUCESTER COUNTY...
  DELAWARE COUNTY...
  WESTERN PHILADELPHIA COUNTY...
  MONTGOMERY COUNTY...

* UNTIL 515 AM EDT...

* AT 116 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN FROM SHOWERS AND A FEW EMBEDDED THUNDERSTORMS IN   
  AN AREA EXTENDING FROM CUMBERLAND COUNTY NJ NORTHWEST INTO         
  THE PHILADELPHIA METRO AREA. RAINFALL RATES OF ONE TO TWO INCHES   
  PER HOUR IS POSSIBLE IN THIS AREA...WHICH WILL RESULT IN RAPID     
  RUNOFF GIVEN THE VERY WET CONDITIONS FROM PREVIOUS RAIN.

DO NOT DRIVE THROUGH FLOODED ROADWAYS...THE WATER MAY BE DEEPER THAN 
YOU THINK.


&&

LAT...LON 3919 7493 3920 7507 3917 7514 3945 7550
      3966 7554 3980 7542 3984 7557 3990 7558
      4007 7537 4013 7552 4023 7563 4030 7564
      4042 7549 4029 7528 3996 7513 3988 7514
      3955 7494 3951 7499 3944 7489 3936 7485

$$

FORECASTER:
2 follow-up statements
309 
WGUS51 KPHI 080908
FFWPHI
NJC011-015-033-PAC045-091-101-081515-
/O.EXT.KPHI.FF.W.0054.000000T0000Z-110908T1515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
508 AM EDT THU SEP 8 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  SALEM COUNTY...
  CUMBERLAND COUNTY...
  GLOUCESTER COUNTY...
  DELAWARE COUNTY...
  WESTERN PHILADELPHIA COUNTY...
  MONTGOMERY COUNTY...

* UNTIL 1115 AM EDT...

* AT 502 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  HEAVY RAIN WAS CONTINUING OVER THE WARNED AREA.  WITH              
  SATURATED CONDITIONS...MOST OF THE RAIN IS BEING CONVERTED         
  TO RUNOFF. SMALL STREAM FLOODING IS WIDESPREAD...AS IS ROADWAY     
  AND POOR DRAINAGE FLOODING.  THIS FLOODING WILL CONTINUE THROUGH   
  THE MORNING HOURS. THE FLASH FLOOD HAS THEREFORE BEEN EXTENDED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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. TURN AROUND...DON'T DROWN! NEVER TRY
TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE
RISING WATER MOVE UP TO HIGHER GROUND.

&&

LAT...LON 3919 7493 3920 7507 3917 7514 3945 7550
      3966 7554 3980 7542 3984 7557 3990 7558
      4007 7537 4013 7552 4023 7563 4030 7564
      4042 7549 4029 7528 3996 7513 3988 7514
      3955 7494 3951 7499 3944 7489 3936 7485

$$

FORECASTER:JJM
819 
WGUS71 KPHI 081244
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
844 AM EDT THU SEP 8 2011

NJC011-015-033-PAC045-091-101-081252-
/O.CAN.KPHI.FF.W.0054.000000T0000Z-110908T1515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SALEM NJ-CUMBERLAND NJ-GLOUCESTER NJ-DELAWARE PA-PHILADELPHIA PA-
MONTGOMERY PA-
844 AM EDT THU SEP 8 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR MONTGOMERY...
WESTERN PHILADELPHIA...DELAWARE...GLOUCESTER...CUMBERLAND AND SALEM
COUNTIES...

THE HEAVY RAINS THE REGION RECEIVED OVERNIGHT HAVE MOVED NORTH. THE 
RAPID, LIFE-THREATENING RISES THE REGION EXPERIENCED EARLIER HAVE 
DIMINISHED.

ALTHOUGH THIS FLASH FLOOD WARNING HAS BEEN CANCELLED, OTHER FLOOD 
WARNINGS REMAIN IN AFFECT THROUGHOUT THE REGION.

LAT...LON 3919 7493 3920 7507 3917 7514 3945 7550
      3966 7554 3980 7542 3984 7557 3990 7558
      4007 7537 4013 7552 4023 7563 4030 7564
      4042 7549 4029 7528 3996 7513 3988 7514
      3955 7494 3951 7499 3944 7489 3936 7485

$$

KRUZDLO

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 7, 9:42 PM EDTRiver Flood WarningPHIMorris42 hr
Sep 7, 11:32 PM EDTAreal Flood AdvisoryPHIBurlington, Hunterdon, Mercer, Middlesex, Monmouth, Morris and 4 more3 hr
Sep 8, 2:26 AM EDTFlash Flood WarningPHIBurlington, Camden, Gloucester, Hunterdon, Mercer6 hr
Sep 8, 3:15 AM EDTFlash Flood WarningPHIHunterdon, Mercer, Morris, Somerset, Sussex, Warren6 hr
Sep 8, 4:01 AM EDTRiver Flood WarningPHIMorris, Somerset7 hr
Sep 8, 4:01 AM EDTRiver Flood WarningPHIBergen, Morris, Passaic36 hr
Sep 8, 4:01 AM EDTRiver Flood WarningPHISomerset18 hr
Sep 8, 4:01 AM EDTRiver Flood WarningPHIMiddlesex, Somerset36 hr
Sep 8, 4:01 AM EDTRiver Flood WarningPHIMercer18 hr
Sep 8, 4:01 AM EDTRiver Flood WarningPHIBurlington15 hr
Sep 8, 4:58 AM EDTFlash Flood WarningPHIMiddlesex, Monmouth, Ocean3 hr
Sep 8, 5:30 AM EDTCoastal Flood WatchPHIBurlington, Camden, Gloucester6 hr
Sep 8, 5:30 AM EDTCoastal Flood AdvisoryPHIBurlington, Camden, Gloucester8 hr
Sep 8, 5:30 AM EDTCoastal Flood AdvisoryPHICumberland, Salem17 hr
Sep 8, 8:36 AM EDTAreal Flood WarningPHIBurlington, Camden, Cumberland, Gloucester, Hunterdon, Mercer and 1 more16 hr
Sep 8, 9:53 AM EDTAreal Flood WarningPHIHunterdon, Mercer, Morris, Somerset24 hr
Sep 8, 9:58 AM EDTAreal Flood WarningPHIMorris7 days
Sep 8, 11:12 AM EDTRiver Flood WarningPHISussex, Warren8 hr
Sep 8, 11:42 AM EDTCoastal Flood WarningPHIBurlington, Camden, Gloucester15 hr
Sep 8, 12:36 PM EDTFlash Flood WarningPHICumberland, Salem2 hr
Sep 8, 1:15 PM EDTSpecial Weather StatementPHICumberland60 min
Sep 8, 5:08 PM EDTRiver Flood WarningPHIMorris, Somerset16 hr
Sep 7, 8:11 PM EDTFlash Flood WarningPHIBerks4 hr
Sep 7, 8:24 PM EDTAreal Flood WarningPHIMontgomery6 hr
Sep 7, 9:32 PM EDTSpecial Weather StatementPHIBerks118 min
Sep 7, 9:38 PM EDTRiver Flood WarningPHIMontgomery13 hr
Sep 8, 12:13 AM EDTAreal Flood WarningPHIBerks24 hr
Sep 8, 3:41 AM EDTRiver Flood WarningPHILehigh, Northampton7 hr
Sep 8, 3:49 AM EDTRiver Flood WarningPHIMonroe7 hr
Sep 8, 5:48 AM EDTRiver Flood WarningPHIMonroe34 hr
Sep 8, 9:32 AM EDTAreal Flood WarningPHIBerks, Bucks, Carbon, Chester, Lehigh, Montgomery15 hr
Sep 8, 3:14 PM EDTRiver Flood WarningPHILehigh, Northampton13 hr

Nearby

Flash Flood Warnings in New Jersey, 2011Flash Flood Warnings in Pennsylvania, 2011Every flash flood warning in 2011

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.