Alert archive / Pennsylvania / Flash Flood Warnings in 2004
Flash Flood Warning 91, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 18, 2004, 2:00 PM EDT for 4 counties in 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, 2:00 PM EDT (18:00 UTC)
- Expired
- Sep 18, 2004, 5:00 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Counties, with a storm outline in the text
Counties Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 124 km from the middle of the area, began a volume at 18:01 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, 6.0 hours before the alert went out and 220 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 181800 FFWPHI PAC025-077-089-095-182100- /X.NEW.KPHI.FF.W.0011.040918T1755Z-040918T2100Z/ /0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 200 PM EDT SAT SEP 18 2004 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED A * FLASH FLOOD WARNING FOR... LEHIGH COUNTY IN EASTERN PENNSYLVANIA THIS INCLUDES THE CITY OF ALLENTOWN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA THIS INCLUDES THE CITY OF BETHLEHEM CARBON COUNTY IN NORTHEAST PENNSYLVANIA MONROE COUNTY IN NORTHEAST PENNSYLVANIA * UNTIL 500 PM EDT * AT 152 PM EDT...FLASH FLOODING WAS REPORTED OVER THE WARNED AREA. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WIND GAP... WEATHERLY...NESQUEHONING...MOUNTAINHOME...MOUNT POCONO...JIM THORPE...EAST STROUDSBURG...EAST BANGOR AND BRODHEADSVILLE. ALTHOUGH RAINFALL HAS ENDED OVER THE AREA...MANY STREAMS ARE ABOVE FLOOD STAGE AND CONTINUING TO RISE. THEREFORE THE FLASH FLOOD WWARNING REMAINS IN EFFECT. LAT...LON 4044 7550 4060 7520 4123 7516 4089 7597 $$ 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, 10:57 AM EDT | Flash Flood Warning | PHI | Bucks, Montgomery | 3 hr |
| Sep 18, 1:45 PM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery | 2 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.