Alert archive / Pennsylvania / Flash Flood Warnings in 2004

Flash Flood Warning 8, NWS Philadelphia/Mount Holly

June 25, 2004Berks County, Chester County, Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 25, 2004, 7:25 PM EDT for Berks County, Chester County, Delaware County, Pennsylvania. It was in force for 85 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: Jun 25, 2004, 7:25 PM EDT (23:25 UTC)
Expired: Sep 18, 2004, 1:30 PM EDT
In force: 85 days
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

Counties Berks County, PA, Chester County, PA, Delaware County, PA

The radar

The Philadelphia radar (KDIX), 133 km from the middle of the area, began a volume at 23:25 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 11.4 hours before the alert went out and 202 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: 375 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 1108 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 43 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 252328
FFWPHI
PAC011-260100-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
725 PM EDT FRI JUN 25 2004

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BERKS COUNTY IN EASTERN PENNSYLVANIA
  
* UNTIL 900 PM EDT

* AT 720 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  NEARLY 3 INCHES OF RAIN HAD FALLEN IN SOUTH CENTRAL BERKS COUNTY
  DURING THE PAST TWO HOURS...AND MORE RAIN IS ON THE WAY.

* WATERSHEDS EFFECTED BY THIS RAIN INCLUDE THE MONOCACY CREEK AND
  ANTIETAM CREEK. THESE WATERSHEDS ARE LOCATED DIRECTLY SOUTH OF THE
  CITY OF READING. 

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 4030 7605 4017 7589 4041 7563 4055 7583

$$

JJM

1 follow-up statement

000 
WGUS51 KPHI 181432
FFWPHI
PAC029-045-181730-
/X.NEW.KPHI.FF.W.0008.040918T1431Z-040918T1730Z/
/0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1031 AM EDT SAT SEP 18 2004

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 130 PM EDT

* AT 1026 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  UP TO 3 INCHES OF RAIN HAD FALLEN OVER EXTREME SOUTHEASTERN        
  PENNSYLVANIA SINCE EARLY THIS MORNING. ADDITIONAL RAIN IS          
  FORECAST UNTIL ABOUT NOON.

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 3991 7531 3984 7552 3985 7554 3985 7564
      3983 7569 3976 7578 3976 7581 3981 7597
      4021 7568

$$

JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 25, 3:17 PM EDT	Flash Flood Warning	PHI	Bucks, Montgomery	85 days
Jun 25, 5:11 PM EDT	Flash Flood Warning	PHI	Carbon, Lehigh, Monroe, Northampton	85 days
Jun 25, 6:29 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	61 min
Jun 25, 7:13 PM EDT	Severe Thunderstorm Warning	PHI	Berks	62 min

Nearby

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; radar from the NEXRAD Level II archive.