Alert archive / Maryland / Flash Flood Warnings in 2004

Flash Flood Warning 94, NWS Philadelphia/Mount Holly

September 28, 2004Kent County, New Castle County, Delaware; Cecil County, Kent County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 28, 2004, 2:36 PM EDT for Kent County, New Castle County, Delaware; Cecil County, Kent County, Queen Anne's County, Maryland. It was in force for 3 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 28, 2004, 2:36 PM EDT (18:36 UTC)
Expired
Sep 28, 2004, 5:30 PM EDT
In force
3 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Counties, with a storm outline in the text

Counties Kent County, DE, New Castle County, DE, Cecil County, MD, Kent County, MD, Queen Anne's County, MD

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.6 hours before the alert went out and 21 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 2004-09-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 95 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 2004-09-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 109 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
95 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
631 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
109 m²/s²
0-3 km storm-relative helicity
172 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KPHI 281838
FFWPHI
DEC001-003-MDC015-029-035-282130-
/X.NEW.KPHI.FF.W.0013.040928T1836Z-040928T2130Z/
/0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
236 PM EDT TUE SEP 28 2004

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN KENT COUNTY IN CENTRAL DELAWARE
  CECIL COUNTY IN NORTHEAST MARYLAND
  KENT COUNTY IN NORTHEAST MARYLAND
  NORTHEASTERN QUEEN ANNES COUNTY IN NORTHEAST MARYLAND
  NEW CASTLE COUNTY IN NORTHERN DELAWARE
  THIS INCLUDES THE CITY OF NEWARK

* UNTIL 530 PM EDT

* AT 236 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  HEAVY RAIN THROUGHOUT THE NORTHERN PORTIONS OF THE DELMARVA AREA   
  AND ADDITIONAL RAIN IS MOVING IN. ONE TO TWO INCHES OF RAIN PER    
  HOUR ARE POSSIBLE WHICH WILL RESULT IN FLOODING IN AREAS OF POOR   
  DRAINAGE AND ALONG SMALL STREAMS.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ELKTON...  
  WILMINGTON MANOR...STANTON...NEWPORT...NEW CASTLE AND ELSMERE.

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 3951 7599 3954 7600 3958 7611 3965 7613
      3979 7557 3966 7555 3962 7561 3959 7560
      3960 7556 3947 7560 3934 7548 3921 7546
      3903 7616 3910 7611 3910 7617 3931 7616
      3937 7612 3937 7603

$$

JJM

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 28, 2:12 PM EDTSevere Thunderstorm WarningPHINew Castle63 min
Sep 28, 3:14 PM EDTSevere Thunderstorm WarningPHINew Castle46 min
Sep 28, 4:01 PM EDTSevere Thunderstorm WarningPHINew Castle44 min
Sep 28, 4:11 PM EDTTornado WarningPHINew Castle34 min
Sep 28, 4:41 PM EDTSevere Thunderstorm WarningPHINew Castle79 min
Sep 28, 5:30 PM EDTFlash Flood WarningPHIKent, New Castle, Sussex3 hr
Sep 28, 6:38 PM EDTSevere Thunderstorm WarningPHIKent67 min

Nearby

Flash Flood Warnings in Maryland, 2004Flash Flood Warnings in Delaware, 2004Every 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.