Alert archive / Pennsylvania / Flash Flood Warnings in 2004

Flash Flood Warning 10, NWS Philadelphia/Mount Holly

July 7, 2004New Castle County, Delaware; 4 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 7, 2004, 7:43 PM EDT for New Castle County, Delaware; 4 counties in Pennsylvania. It was in force for 73 days. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 7, 2004, 7:43 PM EDT (23:43 UTC)
Expired: Sep 18, 2004, 4:00 PM EDT
In force: 73 days
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

Counties New Castle County, DE, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 11.7 hours before the alert went out and 46 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1687 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KPHI 072346
FFWPHI
DEC003-080345-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
743 PM EDT WED JUL 7 2004

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE
 
* UNTIL 1145 PM EDT

* NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED UP TO 3 INCHES OF 
  RAIN HAS FALLEN OVER THE CHRISTINA RIVER WATERSHED IN NORTHERN     
  NEW CASTLE COUNTY. AT 730 PM THE STAGE AT COOCHES BRIDGE WAS
  RAPIDLY APPROACHING THE FLOOD STAGE OF 10.5 FEET.  A CREST OF NEAR 
  12 FEET IS EXPECTED THIS EVENING. 

* ANOTHER LINE OF SHOWERS AND THUNDERSTORMS IN CENTRAL PENNSYLVANIA  
  730 PM EDT COULD AFFECT THE BASIN LATER THIS EVENING.

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.


LAT...LON 3972 7578 3959 7571 3976 7548 3983 7560

$$

JJM

1 follow-up statement

000 
WGUS51 KPHI 181748
FFWPHI
PAC017-029-045-091-182000-
/X.NEW.KPHI.FF.W.0010.040918T1745Z-040918T2000Z/
/0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
145 PM EDT SAT SEP 18 2004

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED A

* FLASH FLOOD WARNING FOR...
  BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA
  CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA
  NORTHWESTERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA
  MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA

* UNTIL 400 PM EDT

* AT 143 PM EDT...FLASH FLOODING WAS REPORTED OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SPRING
  MOUNT...SOUDERTON...RICHBORO...QUAKERTOWN...PERKASIE...LANSDALE...
  IVYLAND...DUBLIN...DOYLESTOWN...COLLEGEVILLE AND CHALFONT.

ALTHOUGH RAINFALL IS RAPIDLY TAPERING OFF...MANY STREAMS IN THE AREA 
ARE STILL ABOVE FLOOD STAGE.  THEREFORE THE FLASH FLOOD WARNING 
CONTINUES IN EFFECT.

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.

LAT...LON 4026 7490 4008 7521 4010 7523 4002 7531
      3986 7558 3983 7569 3975 7577 3978 7606
      3987 7599 3997 7599 4055 7521

$$

AMC

Nearby

Flash Flood Warnings in Pennsylvania, 2004 Flash Flood Warnings in Delaware, 2004 Every flash flood warning in 2004

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.