Alert archive / Maryland / Flash Flood Warnings in 2004

Flash Flood Warning 100, NWS Philadelphia/Mount Holly

September 28, 20045 counties in Maryland; Kent County, New Castle County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 28, 2004, 5:30 PM EDT for 5 counties in Maryland; Kent County, New Castle County, Sussex County, Delaware. 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, 5:30 PM EDT (21:30 UTC)
Expired
Sep 28, 2004, 8:30 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, Sussex County, DE, Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.5 hours before the alert went out and 36 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 282132
FFWPHI
DEC001-003-005-MDC011-015-029-035-041-290030-
/X.NEW.KPHI.FF.W.0019.040928T2130Z-040929T0030Z/
/0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  KENT COUNTY IN CENTRAL DELAWARE
  CAROLINE COUNTY IN EASTERN MARYLAND
  TALBOT COUNTY IN EASTERN MARYLAND
  CECIL COUNTY IN NORTHEAST MARYLAND
  KENT COUNTY IN NORTHEAST MARYLAND
  QUEEN ANNES COUNTY IN NORTHEAST MARYLAND
  NEW CASTLE COUNTY IN NORTHERN DELAWARE
  SUSSEX COUNTY IN SOUTHERN DELAWARE

* UNTIL 830 PM EDT

* AT 526 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  HEAVY RAIN CONTINUING OVER THE AREA WITH MORE RAIN ON THE WAY.     
  FLOODING OF POOR DRAINAGE AREAS AND SMALL STREAMS IS EXPECTED
  TO CONTINUE OVER THE AREA INTO THE EVENING HOURS.

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.

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. TURN AROUND, DONT DROWN.

LAT...LON 3872 7590 3885 7611 3935 7613 3937 7601
      3941 7604 3956 7598 3957 7599 3954 7600
      3958 7611 3970 7615 3972 7579 3976 7573
      3978 7556 3955 7564 3907 7540 3865 7514
      3860 7515 3856 7509

$$

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 WarningPHICecil, Kent63 min
Sep 28, 2:36 PM EDTFlash Flood WarningPHICecil, Kent, Queen Anne's3 hr
Sep 28, 6:38 PM EDTSevere Thunderstorm WarningPHIKent67 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

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.