Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2008
Severe Thunderstorm Warning 134, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 17, 2008, 5:55 PM EDT for 4 counties in Pennsylvania. It was in force for 51 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
- Jul 17, 2008, 5:55 PM EDT (21:55 UTC)
- Expired
- Jul 17, 2008, 6:46 PM EDT
- In force
- 51 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Berks County, PA, Bucks County, PA, Lehigh County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 101 km from the middle of the area, began a volume at 21:56 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, 9.9 hours before the alert went out and 117 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
- 85 J/kg
- Mixed-layer CIN
- -135 J/kg
- Mixed-layer LCL
- 1547 m above ground
- 0-6 km bulk shear
- 3 kt
- 0-1 km storm-relative helicity
- -34 m²/s²
- 0-3 km storm-relative helicity
- -48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS51 KPHI 172156
SVRPHI
PAC011-017-077-091-172300-
/O.NEW.KPHI.SV.W.0134.080717T2155Z-080717T2300Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
555 PM EDT THU JUL 17 2008
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
EAST CENTRAL BERKS COUNTY IN EASTERN PENNSYLVANIA...
SOUTH CENTRAL LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
WEST CENTRAL BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
NORTH CENTRAL MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 700 PM EDT
* AT 552 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM. THIS STORM WAS LOCATED NEAR ZIONSVILLE...OR
ABOUT 11 MILES SOUTHWEST OF ALLENTOWN...AND MOVING SOUTHEAST AT 15
MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
ZIONSVILLE BY 615 PM...
EAST GREENVILLE BY 625 PM...
GERYVILLE BY 635 PM...
QUAKERTOWN BY 700 PM...
LAT...LON 4042 7526 4025 7539 4033 7550 4045 7565
4051 7559
TIME...MOT...LOC 2155Z 295DEG 10KT 4046 7559
$$
NIERENBERG1 follow-up statement
000
WWUS51 KPHI 172246
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
646 PM EDT THU JUL 17 2008
PAC011-017-077-091-172256-
/O.CAN.KPHI.SV.W.0134.000000T0000Z-080717T2300Z/
MONTGOMERY PA-BERKS PA-LEHIGH PA-BUCKS PA-
646 PM EDT THU JUL 17 2008
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL BUCKS...SOUTH
CENTRAL LEHIGH...EAST CENTRAL BERKS AND NORTH CENTRAL MONTGOMERY
COUNTIES IS CANCELLED...
THE THUNDERSTORM THAT PROMPTED THE WARNING TO BE ISSUED HAS WEAKENED.
THE SEVERE THUNDERSTORM WARNING IS CANCELLED.
THE SEVERE THUNDERSTORM HAS MOVED AWAY FROM THE AFFECTED AREA.
LAT...LON 4042 7526 4025 7539 4033 7550 4045 7565
4051 7559
TIME...MOT...LOC 2246Z 295DEG 10KT 4040 7542
$$
NIERENBERGThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 4:09 PM EDT | Excessive Heat Warning | PHI | Delaware, Philadelphia | 3 days |
| Jul 17, 4:31 PM EDT | Severe Thunderstorm Warning | PHI | Carbon | 59 min |
| Jul 17, 4:56 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe, Northampton | 64 min |
| Jul 17, 5:13 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh, Northampton | 62 min |
| Jul 17, 5:14 PM EDT | Areal Flood Advisory | PHI | Carbon, Monroe | 2 hr |
| Jul 17, 5:23 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Northampton | 67 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2008Every severe thunderstorm warning in 2008
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.