Alert archive / New Jersey / Flash Flood Watches in 2009

Flash Flood Watch 1, NWS Philadelphia/Mount Holly

June 9, 20094 states

NWS Philadelphia/Mount Holly issued this flash flood watch at Jun 9, 2009, 1:49 PM EDT for 4 states. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
Jun 9, 2009, 1:49 PM EDT (17:49 UTC)
Expired
Jun 9, 2009, 6:43 PM EDT
In force
5 hr
Issued by
NWS Philadelphia/Mount Holly
Flood severity
None

Counties New Castle County, DE, Cecil County, MD, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Morris County, NJ, Salem County, NJ, Somerset County, NJ, Delaware County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 54 km from the middle of the area, began a volume at 17:50 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 5.8 hours before the alert went out and 112 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, Phillips Aaf/Abe, MD at 12:00Z on 2009-06-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1272 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, Phillips Aaf/Abe, MD at 12:00Z on 2009-06-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 87 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
1272 J/kg
Mixed-layer CIN
-67 J/kg
Mixed-layer LCL
804 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
87 m²/s²
0-3 km storm-relative helicity
108 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.9

Open this sounding in Storm Lab

The text

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

000 
WGUS61 KPHI 091749
FFAPHI

URGENT - IMMEDIATE BROADCAST REQUESTED
FLOOD WATCH
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
149 PM EDT TUE JUN 9 2009

DEZ001-MDZ008-NJZ008>010-012-015>019-PAZ067>071-100400-
/O.NEW.KPHI.FF.A.0001.090609T1749Z-090610T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NEW CASTLE-CECIL-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-MERCER-SALEM-
GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON-CHESTER-MONTGOMERY-
BUCKS-DELAWARE-PHILADELPHIA-
INCLUDING THE CITIES OF...WILMINGTON...ELKTON...MORRISTOWN...
FLEMINGTON...SOMERVILLE...NEW BRUNSWICK...TRENTON...PENNSVILLE...
GLASSBORO...CAMDEN...CHERRY HILL...MOORESTOWN...MOUNT HOLLY...
WEST CHESTER...NORRISTOWN...DOYLESTOWN...MEDIA...PHILADELPHIA
149 PM EDT TUE JUN 9 2009

...FLASH FLOOD WATCH IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A

* FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN DELAWARE...
 NORTHEAST MARYLAND...NEW JERSEY AND SOUTHEAST PENNSYLVANIA...
 INCLUDING THE FOLLOWING AREAS...IN NORTHERN DELAWARE...NEW 
 CASTLE. IN NORTHEAST MARYLAND...CECIL. IN NEW JERSEY...
 CAMDEN...GLOUCESTER...HUNTERDON...MERCER...MIDDLESEX...
 MORRIS...NORTHWESTERN BURLINGTON...SALEM AND SOMERSET. IN 
 SOUTHEAST PENNSYLVANIA...BUCKS...CHESTER...DELAWARE...
 MONTGOMERY AND PHILADELPHIA.

* UNTIL MIDNIGHT EDT TONIGHT

* LIKE THIS MORNING, THUNDERSTORMS THIS AFTERNOON AND EVENING
  ARE EXPECTED TO PRODUCE HEAVY RAIN. THE HEAVY RAIN COULD
  CAUSE WATER TO POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES
  AND SMALLER STREAMS. MAJOR RIVERS SUCH AS THE SCHUYLKILL AND    
  DELAWARE ARE NOT EXPECTED TO FLOOD. 

* IF YOU ENCOUNTER ROAD FLOODING, TURN AROUND IF POSSIBLE. JUST
  ONE FOOT OF FLOWING WATER IS POWERFUL ENOUGH TO SWEEP YOU OR 
  YOUR VEHICLE OFF THE ROAD. THOSE LIVING IN AREAS PRONE TO 
  FLOODING SHOULD BE PREPARED TO TAKE ACTION SHOULD FLOODING 
  DEVELOP.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD
TO FLASH FLOODING. 

&&

$$

KRUZDLO
1 follow-up statement
000 
WGUS61 KPHI 092243
FFAPHI

FLOOD WATCH
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
643 PM EDT TUE JUN 9 2009


DEZ001-MDZ008-NJZ008>010-012-015>019-PAZ067>071-092345-
/O.CAN.KPHI.FF.A.0001.000000T0000Z-090610T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NEW CASTLE-CECIL-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-MERCER-SALEM-
GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON-CHESTER-MONTGOMERY-
BUCKS-DELAWARE-PHILADELPHIA-
INCLUDING THE CITIES OF...WILMINGTON...ELKTON...MORRISTOWN...
FLEMINGTON...SOMERVILLE...NEW BRUNSWICK...TRENTON...PENNSVILLE...
GLASSBORO...CAMDEN...CHERRY HILL...MOORESTOWN...MOUNT HOLLY...
WEST CHESTER...NORRISTOWN...DOYLESTOWN...MEDIA...PHILADELPHIA
643 PM EDT TUE JUN 9 2009

...FLASH FLOOD WATCH IS CANCELLED...

THE FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN DELAWARE...
NORTHEAST MARYLAND...NEW JERSEY AND SOUTHEAST PENNSYLVANIA HAS
BEEN CANCELLED. 

HEAVY RAIN FELL IN PARTS OF SOUTHEAST PENNSYLVANIA AND NORTHEAST
MARYLAND DURING THE EVENING. HOWEVER, ANY HEAVY RAIN HAS MOVED OUT
OF THE AREA.

$$

RNS

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 9, 12:48 AM EDTSevere Thunderstorm WarningPHIMorris, Sussex, Warren42 min
Jun 9, 2:20 AM EDTAreal Flood AdvisoryPHIMorris100 min
Jun 9, 4:17 AM EDTDense Fog AdvisoryPHIAtlantic, Burlington, Camden, Hunterdon, Mercer, Middlesex and 3 more5 hr
Jun 9, 8:00 AM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester, Salem60 min
Jun 9, 8:06 AM EDTSevere Thunderstorm WarningPHIBurlington, Camden54 min
Jun 9, 8:20 AM EDTAreal Flood AdvisoryPHIBurlington, Camden, Gloucester3 hr
Jun 9, 8:30 AM EDTSevere Thunderstorm WarningPHIAtlantic, Cumberland, Gloucester, Salem60 min
Jun 9, 8:42 AM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Camden, Gloucester, Mercer, Middlesex and 4 more3 hr
Jun 9, 8:43 AM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Gloucester62 min
Jun 9, 8:47 AM EDTSevere Thunderstorm WarningPHIAtlantic, Cape May, Cumberland70 min
Jun 9, 9:09 AM EDTAreal Flood AdvisoryPHIAtlantic, Cape May, Cumberland3 hr
Jun 9, 9:21 AM EDTSpecial Marine WarningPHI54 min
Jun 9, 5:38 AM EDTSevere Thunderstorm WarningPHIBerks67 min
Jun 9, 7:20 AM EDTSevere Thunderstorm WarningPHIChester, Delaware, Montgomery, Philadelphia55 min
Jun 9, 9:56 AM EDTFlash Flood WarningPHIChester105 min
Jun 9, 2:20 PM EDTFlash Flood WarningPHIBerks, Chester3 hr
Jun 9, 2:24 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Montgomery66 min
Jun 9, 2:59 PM EDTTornado WarningPHIChester32 min
Jun 9, 3:08 PM EDTTornado WarningPHIChester28 min
Jun 9, 3:14 PM EDTTornado WarningPHIChester46 min
Jun 9, 3:29 PM EDTSevere Thunderstorm WarningPHIChester61 min
Jun 9, 4:19 PM EDTSevere Thunderstorm WarningPHICecil, Kent, Queen Anne's56 min
Jun 9, 5:13 PM EDTSevere Thunderstorm WarningPHICaroline, Cecil, Kent, Queen Anne's, Talbot92 min
Jun 9, 5:19 PM EDTAreal Flood WarningPHICecil71 min
Jun 9, 8:31 AM EDTSevere Thunderstorm WarningPHISussex59 min
Jun 9, 6:57 PM EDTSevere Thunderstorm WarningPHIKent39 min

Nearby

Flash Flood Watches in New Jersey, 2009Flash Flood Watches in Pennsylvania, 2009Flash Flood Watches in Maryland, 2009Every flash flood watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.