Alert archive / Pennsylvania / Flash Flood Warnings in 2004
Flash Flood Warning 101, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 28, 2004, 6:47 PM EDT for Chester County, Delaware County, Pennsylvania. 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, 6:47 PM EDT (22:47 UTC)
- Expired
- Sep 28, 2004, 9:45 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Counties, with a storm outline in the text
Counties Chester County, PA, Delaware County, PA
The radar
The Philadelphia radar (KDIX), 109 km from the middle of the area, began a volume at 22:47 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
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.8 hours before the alert went out and 60 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.
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS51 KPHI 282251
FFWPHI
PAC029-045-290145-
/X.NEW.KPHI.FF.W.0020.040928T2247Z-040929T0145Z/
/0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
647 PM EDT TUE SEP 28 2004
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING CONTINUED FOR...
CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA
DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA
* UNTIL 945 PM EDT
* AT 642 PM EDT...HEAVY RAIN CONTINUES ACROSS THE AREA. MORE RAIN IS
ON THE WAY. EXPECT FLOODING ALONG SMALL STREAMS AND EVEN ALONG
THE BRANDYWINE EIVER.
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 3995 7531 4025 7568 4008 7591 3974 7610
3975 7593 3975 7582 3983 7574 3989 7561
3984 7544
$$
JJMThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 28, 12:48 PM EDT | Flash Flood Warning | PHI | Monroe, Northampton | 3 hr |
| Sep 28, 3:55 PM EDT | Flash Flood Warning | PHI | Chester, Delaware | 3 hr |
| Sep 28, 4:16 PM EDT | Flash Flood Warning | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 3 hr |
| Sep 28, 4:41 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 79 min |
| Sep 28, 4:55 PM EDT | Flash Flood Warning | PHI | Carbon, Monroe | 4 hr |
| Sep 28, 5:11 PM EDT | Flash Flood Warning | PHI | Philadelphia | 3 hr |
| Sep 28, 6:05 PM EDT | Special Marine Warning | PHI | 115 min | |
| Sep 28, 7:11 PM EDT | Flash Flood Warning | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 6 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 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; radar from the NEXRAD Level II archive.