Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2016
Severe Thunderstorm Warning 170, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 12, 2016, 4:49 PM EDT for Chester County, Delaware County, Montgomery County, Pennsylvania. It was in force for 41 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 12, 2016, 4:49 PM EDT (20:49 UTC)
- Expired
- Aug 12, 2016, 5:30 PM EDT
- In force
- 41 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Chester County, PA, Delaware County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 85 km from the middle of the area, began a volume at 20:49 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 8.8 hours before the alert went out and 215 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
- 756 J/kg
- Mixed-layer CIN
- -110 J/kg
- Mixed-layer LCL
- 1172 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
623
WUUS51 KPHI 122049
SVRPHI
PAC029-045-091-122130-
/O.NEW.KPHI.SV.W.0170.160812T2049Z-160812T2130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
449 PM EDT FRI AUG 12 2016
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHEASTERN CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...
NORTHERN DELAWARE COUNTY IN SOUTHEASTERN PENNSYLVANIA...
SOUTHERN MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA...
* UNTIL 530 PM EDT
* AT 448 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED OVER
LIONVILLE...OR 7 MILES NORTH OF WEST CHESTER...MOVING EAST AT 35
MPH.
HAZARD...60 MPH WIND GUSTS.
SOURCE...RADAR INDICATED.
IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES.
* LOCATIONS IMPACTED INCLUDE...
WEST CHESTER...NORRISTOWN...PHOENIXVILLE...LANSDALE...
WEST NORRITON...EAST NORRITON...WESTTOWN...DOWNINGTOWN...
CONSHOHOCKEN...AMBLER...COLLEGEVILLE...ROYERSFORD...NARBERTH...
TRAPPE...EAST LANSDOWNE...VALLEY FORGE...MARSHALLTON...
RADNOR TOWNSHIP AND TROUT LAKE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING AS THIS STORM MOVES THROUGH.
&&
LAT...LON 4020 7576 4024 7543 4023 7517 4022 7516
4009 7522 4005 7526 4001 7521 3997 7528
3994 7525 3992 7572
TIME...MOT...LOC 2048Z 270DEG 30KT 4007 7563
HAIL...<.75IN
WIND...60MPH
$$
JJM1 follow-up statement
476
WWUS51 KPHI 122121
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
521 PM EDT FRI AUG 12 2016
PAC029-045-091-122130-
/O.CON.KPHI.SV.W.0170.000000T0000Z-160812T2130Z/
CHESTER PA-DELAWARE PA-MONTGOMERY PA-
521 PM EDT FRI AUG 12 2016
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR NORTHEASTERN CHESTER...NORTHEASTERN DELAWARE AND SOUTHEASTERN
MONTGOMERY COUNTIES...
AT 520 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED OVER
CONSHOHOCKEN... OR 8 MILES NORTHWEST OF PHILADELPHIA...MOVING EAST
AT 35 MPH.
HAZARD...60 MPH WIND GUSTS.
SOURCE...RADAR INDICATED.
IMPACT...EXPECT DAMAGE TO...SIDING...AND TREES.
LOCATIONS IMPACTED INCLUDE...
NORRISTOWN...PHOENIXVILLE...WEST NORRITON...EAST NORRITON...
CONSHOHOCKEN...AMBLER...COLLEGEVILLE...NARBERTH...TRAPPE...
PLYMOUTH MEETING...VALLEY FORGE...BRYN MAWR...KING OF PRUSSIA...
RADNOR TOWNSHIP...TROUT LAKE...PAOLI...NEWTOWN SQUARE...
BROOMALL AND SKIPPACK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
HEAVY RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO FLASH
FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.
&&
LAT...LON 4022 7542 4023 7517 4022 7516 4009 7522
4005 7526 4001 7521 3997 7528 3996 7527
3996 7528 3999 7549 4020 7552
TIME...MOT...LOC 2120Z 270DEG 30KT 4007 7528
HAIL...<.75IN
WIND...60MPH
$$
JJMThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 10:39 PM EDT | Special Weather Statement | PHI | Carbon, Lehigh, Monroe, Northampton | 51 min |
| Aug 11, 10:57 PM EDT | Areal Flood Advisory | PHI | Carbon, Lehigh, Monroe, Northampton | 4 hr |
| Aug 11, 11:13 PM EDT | Flash Flood Warning | PHI | Carbon, Monroe, Northampton | 4 hr |
| Aug 12, 3:04 AM EDT | Special Weather Statement | PHI | Lehigh, Northampton | 56 min |
| Aug 12, 3:38 PM EDT | Heat Advisory | PHI | Carbon, Monroe | 27 hr |
| Aug 12, 3:53 PM EDT | Special Weather Statement | PHI | Carbon, Monroe | 52 min |
| Aug 12, 4:03 PM EDT | Special Weather Statement | PHI | Berks, Chester | 57 min |
| Aug 12, 4:45 PM EDT | Special Weather Statement | PHI | Lehigh, Northampton | 60 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2016Every severe thunderstorm warning in 2016
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.