Alert archive / Pennsylvania / Flash Flood Warnings in 2004
Flash Flood Warning 89, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 18, 2004, 10:57 AM EDT for Bucks County, Montgomery 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 18, 2004, 10:57 AM EDT (14:57 UTC)
- Expired
- Sep 18, 2004, 2:00 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Counties, with a storm outline in the text
Counties Bucks County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 95 km from the middle of the area, began a volume at 14:57 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
Brookhaven, NY (KOKX), launched 12:00Z, 3.0 hours before the alert went out and 223 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
- 1385 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 550 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 226 m²/s²
- 0-3 km storm-relative helicity
- 206 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 5.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS51 KPHI 181503 FFWPHI PAC017-091-181800- /X.NEW.KPHI.FF.W.0009.040918T1457Z-040918T1800Z/ /0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1057 AM EDT SAT SEP 18 2004 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS CONTINUED A * FLASH FLOOD WARNING FOR... UPPER BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA UPPER MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA * UNTIL 200 PM EDT * AT 1053 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED MODERATE TO HEAVY RAIN STILL FALLING OVER THE WARNED AREA. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO QUAKERTOWN...PERKASIE AND DUBLIN. ADDITIONAL RAINFALL AMOUNTS OF UP TO 1 INCH ARE POSSIBLE IN THE WARNED AREA. FLOODING IS OCCURRING ALONG THE PERKIOMEN CREEK IN UPPER MONTGOMERY COUNTY. STREET FLOODING IS ALSO BEING REPORTED IN UPPER BUCKS COUNT. 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 4026 7569 4006 7536 4048 7509 4060 7523 $$ AMC
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 18, 3:29 AM EDT | Severe Thunderstorm Warning | PHI | Chester | 31 min |
| Sep 18, 6:09 AM EDT | Flash Flood Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 4 hr |
| Sep 18, 7:07 AM EDT | Flash Flood Warning | PHI | Bucks, Montgomery | 4 hr |
| Sep 18, 9:48 AM EDT | Flash Flood Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 4 hr |
| Sep 18, 10:31 AM EDT | Flash Flood Warning | PHI | Chester, Delaware | 3 hr |
| Sep 18, 1:45 PM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery | 2 hr |
| Sep 18, 2:00 PM EDT | Flash Flood Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 3 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.