Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2008
Severe Thunderstorm Warning 93, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 18, 2008, 4:57 PM EDT for Bucks County, Chester County, Montgomery County, Pennsylvania. It was in force for 42 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
- Jun 18, 2008, 4:57 PM EDT (20:57 UTC)
- Expired
- Jun 18, 2008, 5:39 PM EDT
- In force
- 42 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Bucks County, PA, Chester County, PA, Montgomery County, PA
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.0 hours before the alert went out and 112 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1436 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 84 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 182057
SVRPHI
PAC017-029-091-182200-
/O.NEW.KPHI.SV.W.0093.080618T2057Z-080618T2200Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
457 PM EDT WED JUN 18 2008
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHWESTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
NORTHEASTERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 600 PM EDT
* AT 455 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
CEDARVILLE...OR ABOUT 16 MILES SOUTHEAST OF READING...AND MOVING
EAST AT 25 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
PHOENIXVILLE BY 515 PM...
COLLEGEVILLE AND SPRING MOUNT BY 525 PM...
SOUDERTON BY 540 PM...
LANSDALE BY 545 PM...
FRICKS BY 550 PM...
CHALFONT BY 555 PM...
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.
LAT...LON 4013 7591 4024 7571 4029 7566 4060 7520
4056 7519 4055 7518 4056 7515 4039 7504
4001 7556
TIME...MOT...LOC 2057Z 263DEG 22KT 4020 7567
$$
RNS2 follow-up statements
000
WWUS51 KPHI 182120
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
520 PM EDT WED JUN 18 2008
PAC017-029-091-182200-
/O.CON.KPHI.SV.W.0093.000000T0000Z-080618T2200Z/
CHESTER PA-MONTGOMERY PA-BUCKS PA-
520 PM EDT WED JUN 18 2008
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR NORTHWESTERN BUCKS...MONTGOMERY AND NORTHEASTERN CHESTER
COUNTIES...
AT 512 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED NEAR SCHWENKSVILLE...OR 23 MILES NORTHWEST OF PHILADELPHIA...
MOVING EAST AT 42 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
HATFIELD...SOUDERTON...TELFORD AND LANSDALE BY 525 PM EDT...
FRICKS...CHALFONT...BRITTANY FARMS-HIGHLANDS AND SILVERDALE BY 530
PM EDT...
NEW BRITAIN AND DUBLIN BY 535 PM EDT...
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.
LAT...LON 4030 7556 4055 7516 4039 7504 4007 7548
4013 7564 4014 7565
TIME...MOT...LOC 2120Z 249DEG 37KT 4027 7535
$$
RNS000
WWUS51 KPHI 182139
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
538 PM EDT WED JUN 18 2008
PAC017-029-091-182148-
/O.CAN.KPHI.SV.W.0093.000000T0000Z-080618T2200Z/
CHESTER PA-MONTGOMERY PA-BUCKS PA-
538 PM EDT WED JUN 18 2008
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BUCKS...
MONTGOMERY AND NORTHEASTERN CHESTER COUNTIES IS CANCELLED...
THE THUNDERSTORMS HAVE WEAKENED BUT GUSTY WINDS TO 40 MPH STILL ARE
POSSIBLE OVER SOUTHERN MONTGOMERY AND CENTRAL AND SOUTHERN BUCKS
COUNTIES.
LAT...LON 4030 7556 4055 7516 4039 7504 4007 7548
4013 7564 4014 7565
TIME...MOT...LOC 2138Z 249DEG 37KT 4034 7512
$$
RNSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 4:35 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh, Northampton | 40 min |
| Jun 18, 5:03 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 57 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.