Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 120, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 4, 2007, 8:47 PM EDT for Chester County, Pennsylvania. It was in force for 58 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 4, 2007, 8:47 PM EDT (00:47 UTC)
- Expired
- Jul 4, 2007, 9:45 PM EDT
- In force
- 58 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), 128 km from the middle of the area, began a volume at 00:50 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 |
|---|---|---|---|
| Jul 4, 2:06 PM EDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 0.8 hours before the alert went out and 175 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
- 1453 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 1011 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 200 m²/s²
- 0-3 km storm-relative helicity
- 387 m²/s²
- Significant tornado parameter
- 1.6
- Supercell composite
- 13.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS51 KPHI 050047 SVRPHI PAC029-050145- /O.NEW.KPHI.SV.W.0120.070705T0047Z-070705T0145Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 847 PM EDT WED JUL 4 2007 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA... * UNTIL 945 PM EDT * AT 846 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 7 MILES SOUTHWEST OF HONEY BROOK...OR ABOUT 15 MILES EAST OF LANCASTER... AND MOVING EAST AT 30 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... HONEY BROOK BY 855 PM EDT... PARKESBURG BY 900 PM EDT... COATESVILLE BY 910 PM EDT... DOWNINGTOWN BY 920 PM EDT... 7 MILES SOUTH OF LIONVILLE AND 8 MILES NORTH OF KENNETT SQUARE BY 925 PM EDT... WEST CHESTER BY 930 PM EDT... A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO IS SPOTTED... ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM. LAT...LON 4015 7610 3997 7617 3982 7571 4007 7549 $$ MPD
1 follow-up statement
000
WWUS51 KPHI 050116
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
915 PM EDT WED JUL 4 2007
PAC029-050145-
/O.CON.KPHI.SV.W.0120.000000T0000Z-070705T0145Z/
CHESTER PA-
915 PM EDT WED JUL 4 2007
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM EDT
FOR CENTRAL CHESTER COUNTY...
AT 911 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...DANGEROUS CLOUD TO GROUND LIGHTNING...AND DAMAGING WINDS IN
EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR SOUTH
COATESVILLE...OR ABOUT 20 MILES NORTH OF NEWARK...MOVING SOUTHEAST
AT 25 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
THORNDALE BY 920 PM EDT...
DOWNINGTOWN...7 MILES NORTHEAST OF TOUGHKENAMON...8 MILES NORTHEAST
OF AVONDALE AND 9 MILES SOUTHWEST OF LIONVILLE BY 925 PM EDT...
KENNETT SQUARE AND 8 MILES SOUTHWEST OF EXTON BY 930 PM EDT...
WEST CHESTER BY 935 PM EDT...
WEST GOSHEN BY 940 PM EDT...
A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT WEDNESDAY EVENING
FOR CHESTER COUNTY.
LAT...LON 4010 7579 3996 7598 3986 7600 3979 7574
4002 7547
$$
MPDThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 12:22 AM EDT | Flash Flood Warning | PHI | Lehigh, Northampton | 4 hr |
| Jul 5, 12:25 AM EDT | Flash Flood Warning | PHI | Lehigh, Northampton | 4 hr |
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.