Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010
Severe Thunderstorm Warning 134, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 16, 2010, 6:44 PM EDT for Chester County, Delaware County, Pennsylvania. It was in force for 61 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 16, 2010, 6:44 PM EDT (22:44 UTC)
- Expired
- Aug 16, 2010, 7:45 PM EDT
- In force
- 61 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Chester County, PA, Delaware County, PA
The radar
The Philadelphia radar (KDIX), 103 km from the middle of the area, began a volume at 22:43 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 16, 12:05 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.7 hours before the alert went out and 73 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
- 501 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 538 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 99 m²/s²
- 0-3 km storm-relative helicity
- 94 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
241
WUUS51 KPHI 162244
SVRPHI
PAC029-045-162345-
/O.NEW.KPHI.SV.W.0134.100816T2244Z-100816T2345Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
644 PM EDT MON AUG 16 2010
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
THIS INCLUDES THE CITY OF WEST CHESTER...
WESTERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 745 PM EDT
* AT 643 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM GLENMOORE TO COATESVILLE TO
PARKESBURG...OR ALONG A LINE EXTENDING FROM 12 MILES NORTHWEST OF
WEST CHESTER TO 12 MILES WEST OF WEST CHESTER TO 18 MILES EAST OF
LANCASTER...AND MOVING EAST AT 15 MPH.
* SEVERE THUNDERSTORMS WILL BE NEAR...
PARKESBURG AND COATESVILLE AROUND 650 PM EDT...
OXFORD AND COCHRANVILLE AROUND 655 PM EDT...
LIONVILLE AND DOWNINGTOWN AROUND 705 PM EDT...
CHESTER SPRINGS AROUND 710 PM EDT...
WEST GROVE AND MARSHALLTON AROUND 720 PM EDT...
KEMBLESVILLE AROUND 725 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT MONDAY
EVENING FOR NORTHWESTERN NEW JERSEY AND EASTERN PENNSYLVANIA.
&&
LAT...LON 3973 7611 3987 7601 4011 7594 4025 7570
4023 7561 4015 7553 4015 7551 4013 7551
4013 7548 4009 7545 4010 7543 4007 7541
4007 7537 4000 7546 3998 7546 3994 7539
3984 7556 3982 7570 3973 7578 3973 7614
TIME...MOT...LOC 2245Z 285DEG 15KT 4008 7575 4000 7582
3995 7596
$$1 follow-up statement
087
WWUS51 KPHI 162316
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
716 PM EDT MON AUG 16 2010
PAC029-045-162345-
/O.CON.KPHI.SV.W.0134.000000T0000Z-100816T2345Z/
DELAWARE PA-CHESTER PA-
716 PM EDT MON AUG 16 2010
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR SOUTHERN CHESTER AND WESTERN DELAWARE COUNTIES...
AT 714 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM MALVERN TO WEST CHESTER TO
KENNETT SQUARE...OR ALONG A LINE EXTENDING FROM WEST CHESTER TO 9
MILES SOUTHWEST OF WEST CHESTER...MOVING EAST AT 15 MPH.
SEVERE THUNDERSTORMS WILL BE NEAR...
WESTTOWN AND KENNETT SQUARE BY 725 PM EDT...
DEVON-BERWYN AND CHEYNEY BY 730 PM EDT...
GRADYVILLE BY 735 PM EDT...
CONCORDVILLE...UPPER PROVIDENCE TOWNSHIP...ELAM AND LIMA BY 745 PM
EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT MONDAY
EVENING FOR NORTHWESTERN NEW JERSEY AND EASTERN PENNSYLVANIA.
&&
LAT...LON 4002 7563 4007 7541 4007 7537 4000 7546
3998 7546 3994 7539 3984 7556 3984 7563
3982 7570 3987 7600
TIME...MOT...LOC 2316Z 285DEG 15KT 4000 7553 3994 7561
3990 7575
$$
POThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 3:03 PM EDT | Special Weather Statement | PHI | Bucks | 57 min |
| Aug 16, 3:12 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 27 min |
| Aug 16, 3:55 PM EDT | Special Weather Statement | PHI | Berks | 65 min |
| Aug 16, 4:04 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 56 min |
| Aug 16, 5:01 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 74 min |
| Aug 16, 5:50 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 55 min |
| Aug 16, 7:45 PM EDT | Special Weather Statement | PHI | Delaware | 60 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2010Every severe thunderstorm warning in 2010
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.