Alert archive / Maryland / Flash Flood Warnings in 2004

Flash Flood Warning 13, NWS Philadelphia/Mount Holly

July 12, 2004Montgomery County, Pennsylvania; Cecil County, Kent County, Queen Anne's County, Maryland; Kent County, New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 12, 2004, 8:28 AM EDT for Montgomery County, Pennsylvania; Cecil County, Kent County, Queen Anne's County, Maryland; Kent County, New Castle County, Delaware. It was in force for 78 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 12, 2004, 8:28 AM EDT (12:28 UTC)
Expired: Sep 28, 2004, 5:30 PM EDT
In force: 78 days
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, Montgomery County, PA

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 0.5 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-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: 76 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 902 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KPHI 121233
FFWPHI
PAC091-121430-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
828 AM EDT MON JUL 12 2004

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 1030 AM EDT

* AT 825 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  THAT AT LEAST 2 INCHES OF RAIN HAD FALLEN OVER PORTIONS OF         
  NORTHWESTERN MONTGOMERY COUNTY DURING THE LAST HOUR OR SO.         
  ADDITIONAL RAINFALL AMOUNTS OF 1 INCH IS POSSIBLE IN THE WARNED    
  AREA DURING THE NEXT HOUR.

AT 825 AM EDT...MONTGOMERY COUNTY OFFICIALS REPORTED ROADWAY 
FLOODING IN POTTSTOWN. AUTOMOBILES WERE ALSO STUCK IN RISING WATERS 
AT A FEW INTERSECTIONS.

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. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. 
MOVE TO HIGHER GROUND.

LAT...LON 4028 7566 4020 7552 4034 7538 4042 7553

$$

KRUZDLO

1 follow-up statement

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.

Issued	Product	Office	Counties	Lasted
Jul 12, 7:26 AM EDT	Flash Flood Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	68 days
Jul 12, 7:50 AM EDT	Flash Flood Warning	PHI	Chester	68 days
Jul 12, 9:31 AM EDT	Flash Flood Warning	PHI	Berks, Chester, Delaware	78 days
Jul 12, 12:10 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	78 days
Jul 12, 4:33 PM EDT	Flash Flood Warning	PHI	Carbon, Monroe	78 days
Jul 12, 4:49 PM EDT	Flash Flood Warning	PHI	Philadelphia	78 days
Jul 12, 4:50 PM EDT	Special Marine Warning	PHI		70 min
Jul 12, 6:51 PM EDT	Flash Flood Warning	PHI	Chester, Delaware	78 days
Jul 12, 7:32 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	78 days
Jul 12, 1:09 PM EDT	Severe Thunderstorm Warning	PHI	Cecil	51 min
Jul 12, 1:17 PM EDT	Tornado Warning	PHI	Cecil	43 min
Jul 12, 2:52 PM EDT	Flash Flood Warning	PHI	Cecil	78 days
Jul 12, 5:26 PM EDT	Severe Thunderstorm Warning	PHI	Talbot	49 min
Jul 12, 5:45 PM EDT	Flash Flood Warning	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	78 days
Jul 12, 1:53 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	37 min
Jul 12, 2:22 PM EDT	Tornado Warning	PHI	New Castle	38 min
Jul 12, 3:05 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	55 min
Jul 12, 3:51 PM EDT	Severe Thunderstorm Warning	PHI	Kent	54 min
Jul 12, 4:08 PM EDT	Tornado Warning	PHI	Kent	37 min
Jul 12, 5:09 PM EDT	Severe Thunderstorm Warning	PHI	Kent	36 min

Nearby

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