Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 48, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 8, 2007, 8:53 PM EDT for Chester County, Pennsylvania. It was in force for 46 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 8, 2007, 8:53 PM EDT (00:53 UTC)
- Expired
- Jun 8, 2007, 9:39 PM EDT
- In force
- 46 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Counties, with a storm outline in the text
County Chester County, PA
The radar
The Philadelphia radar (KDIX), 126 km from the middle of the area, began a volume at 00:54 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 |
|---|---|---|---|
| Jun 8, 8:29 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 0.9 hours before the alert went out and 170 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
- 1775 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 1660 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 71 m²/s²
- 0-3 km storm-relative helicity
- 131 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 090053
SVRPHI
PAC029-090200-
/O.NEW.KPHI.SV.W.0048.070609T0053Z-070609T0200Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
853 PM EDT FRI JUN 8 2007
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 1000 PM EDT
* AT 850 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
OF 60 MPH. THIS STORM WAS LOCATED NEAR PARKESBURG...OR ABOUT 18
MILES EAST OF LANCASTER...AND MOVING EAST AT 35 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
COATESVILLE BY 905 PM EDT...
DOWNINGTOWN BY 915 PM EDT...
WEST CHESTER AND LIONVILLE BY 920 PM EDT...
PAOLI BY 935 PM EDT...
IN ADDITION TO DAMAGING WINDS...CONTINUOUS 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.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT
FRIDAY EVENING FOR NORTHEAST MARYLAND.
LAT...LON 4003 7620 3986 7615 3973 7599 3973 7579
3984 7569 4001 7543 4021 7564
$$
JJM1 follow-up statement
000
WWUS51 KPHI 090139
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
936 PM EDT FRI JUN 8 2007
PAC029-090146-
/O.CAN.KPHI.SV.W.0048.000000T0000Z-070609T0200Z/
CHESTER PA-
936 PM EDT FRI JUN 8 2007
...THE SEVERE THUNDERSTORM WARNING FOR CHESTER COUNTY IS CANCELLED...
THUNDERSTORMS MOVING ACROSS CHESTER COUNTY AT 935 PM HAVE WEAKENED.
WHILE THUNDER...LIGHTNING AND GUSTY WINDS ARE STILL POSSIBLE...NO
SEVERE WEATHER IS ANTICIPATED. THE WARNING HAS THEREFORE BEEN
CANCELLED.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT
FRIDAY EVENING FOR NORTHEAST MARYLAND.
LAT...LON 4003 7620 3986 7615 3973 7599 3973 7579
3984 7569 4001 7543 4021 7564
$$
JJMThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 8, 9:57 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 48 min |
| Jun 8, 10:40 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 42 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2007Every severe thunderstorm warning in 2007
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.