Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2004
Severe Thunderstorm Warning 172, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 11, 2004, 5:37 PM EDT for Bucks County, Pennsylvania; Burlington County, New Jersey. It was in force for 53 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 11, 2004, 5:37 PM EDT (21:37 UTC)
- Expired
- Aug 11, 2004, 6:30 PM EDT
- In force
- 53 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Counties, with a storm outline in the text
Counties Burlington County, NJ, Bucks County, PA
The radar
The Philadelphia radar (KDIX), 44 km from the middle of the area, began a volume at 21:38 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 11, 12:55 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 9.6 hours before the alert went out and 184 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
- 1077 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 599 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 130 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 1.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS51 KPHI 112137 SVRPHI NJC005-PAC017-112230- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 536 PM EDT WED AUG 11 2004 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... BURLINGTON COUNTY IN SOUTHERN NEW JERSEY. BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA. * UNTIL 630 PM EDT * AT 533 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 8 MILES WEST OF RIVERSIDE...OR OVER PHILADELPHIA...AND MOVING NORTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... RIVERSIDE BY 550 PM EDT... BEVERLY BY 555 PM EDT... LANGHORNE BY 605 PM EDT... BRISTOL AND LEVITTOWN BY 610 PM EDT... FLORENCE AND 7 MILES SOUTHEAST OF WOODSIDE BY 620 PM EDT... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL IN PHILADELPHIA. PLEASE WATCH ALSO FOR THE POTENTIAL FOR DAMAGING WINDS. LAT...LON 4027 7483 4001 7509 4008 7468 4021 7478 $$ TFG
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 2:21 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 54 min |
| Aug 11, 2:40 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 95 min |
| Aug 11, 3:12 PM EDT | Tornado Warning | PHI | Chester | 78 min |
| Aug 11, 4:04 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 41 min |
| Aug 11, 5:09 PM EDT | Special Marine Warning | PHI | 81 min | |
| Aug 11, 5:25 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 65 min |
| Aug 11, 5:28 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 32 min |
| Aug 11, 5:56 PM EDT | Severe Thunderstorm Warning | PHI | Montgomery | 34 min |
| Aug 11, 12:46 PM EDT | Severe Thunderstorm Warning | PHI | Morris | 59 min |
| Aug 11, 1:00 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Somerset | 60 min |
| Aug 11, 1:44 PM EDT | Severe Thunderstorm Warning | PHI | Morris | 46 min |
| Aug 11, 2:02 PM EDT | Severe Thunderstorm Warning | PHI | Somerset | 28 min |
| Aug 11, 3:27 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Somerset | 78 min |
| Aug 11, 4:52 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 23 min |
| Aug 11, 5:53 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex | 67 min |
| Aug 11, 6:19 PM EDT | Severe Thunderstorm Warning | PHI | Mercer | 41 min |
| Aug 11, 6:32 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Somerset | 73 min |
| Aug 11, 6:47 PM EDT | Flash Flood Warning | PHI | Middlesex | 118 min |
| Aug 11, 7:08 PM EDT | Severe Thunderstorm Warning | PHI | Mercer | 32 min |
| Aug 11, 7:45 PM EDT | Flash Flood Warning | PHI | Monmouth | 2 hr |
| Aug 11, 7:58 PM EDT | Flash Flood Warning | PHI | Mercer | 2 hr |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2004Severe Thunderstorm Warnings in New Jersey, 2004Every severe thunderstorm 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.