Alert archive / Pennsylvania / Flash Flood Warnings in 2006
Flash Flood Warning 55, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 22, 2006, 3:25 PM EDT for 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
- Jul 22, 2006, 3:25 PM EDT (19:25 UTC)
- Expired
- Jul 22, 2006, 6:30 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Counties, with a storm outline in the text
County Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 85 km from the middle of the area, began a volume at 19:26 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, 7.4 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
- 1227 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 633 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 88 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS51 KPHI 221925 FFWPHI PAC091-222230- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 325 PM EDT SAT JUL 22 2006 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA * UNTIL 630 PM EDT * AT 322 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM CAPABLE OF PRODUCING FLASH FLOODING OVER THE WARNED AREA. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NORRISTOWN AND LANSDALE 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. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND. LAT...LON 4011 7551 4006 7541 4022 7516 4028 7526 $$ STAUBER
1 follow-up statement
000 WGUS71 KPHI 222206 FFSPHI FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 606 PM EDT SAT JUL 22 2006 PAC091-222216- MONTGOMERY PA- 606 PM EDT SAT JUL 22 2006 ...THE FLASH FLOOD WARNING FOR CENTRAL MONTGOMERY COUNTY IS CANCELLED... HEAVY RAIN HAS MOVED OUT OF THE AREA AND RENEWED FLASH FLOODING IS NO LONGER A THREAT. LAT...LON 4011 7551 4006 7541 4022 7516 4028 7526 $$ JJM
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 9:32 PM EDT | Flash Flood Warning | PHI | Berks, Bucks, Lehigh, Northampton | 3 hr |
| Jul 21, 10:14 PM EDT | Flash Flood Warning | PHI | Montgomery | 2 hr |
| Jul 22, 12:11 AM EDT | Flash Flood Warning | PHI | Berks, Bucks, Lehigh | 4 hr |
| Jul 22, 3:37 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 53 min |
| Jul 22, 3:42 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 57 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2006Every flash flood warning in 2006
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.