Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019
Severe Thunderstorm Warning 375, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 21, 2019, 3:08 PM EDT for Berks County, Chester County, Montgomery County, Pennsylvania. It was in force for 34 min. 4 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 21, 2019, 3:08 PM EDT (19:08 UTC)
- Expired
- Aug 21, 2019, 3:42 PM EDT
- In force
- 34 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Berks County, PA, Chester County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 113 km from the middle of the area, began a volume at 19:10 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 21, 3:08 PM EDT | TSTM WND DMG | 1 Sw Robeson Twp, PA | SEVERAL REPORTS OF TREES, POWER LINES, AND POWER POLES DOWN AROUND PLOW ROAD IN ROBESON TWP. TIME ESTIMATED FROM RADAR. |
| Aug 21, 3:14 PM EDT | TSTM WND DMG | 1 E Lorane, PA | TREE DOWN NEAR LINCOLN ROAD AND LORANE ROAD. TIME ESTIMATED FROM RADAR. |
| Aug 21, 3:14 PM EDT | TSTM WND DMG | 2 Sse Robeson Twp, PA | TREE DOWN ON WIRES ON HAYCREEK ROAD. TIME ESTIMATED FROM RADAR. |
| Aug 21, 3:33 PM EDT | TSTM WND DMG | 1 S Douglassville, PA | DOWNED TREE AND WIRES NEAR THE INTERSECTION OF BLACK MATT ROAD AND YOCUM ROAD. TIME ESTIMATED FROM RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.1 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
- 190 J/kg
- Mixed-layer CIN
- -216 J/kg
- Mixed-layer LCL
- 1166 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 27 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
748
WUUS51 KPHI 211908
SVRPHI
PAC011-029-091-212000-
/O.NEW.KPHI.SV.W.0375.190821T1908Z-190821T2000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
308 PM EDT Wed Aug 21 2019
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southeastern Berks County in eastern Pennsylvania...
Northwestern Montgomery County in southeastern Pennsylvania...
North central Chester County in southeastern Pennsylvania...
* Until 400 PM EDT.
* At 308 PM EDT, a severe thunderstorm was located over Birdsboro, or
near Reading, moving east at 20 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to
roofs, siding, trees, and power lines is possible.
* Locations impacted include...
Reading, Pottstown, Birdsboro, Collegeville, Royersford, Trappe,
East Greenville, Schwenksville, Bally, Bechtelsville, Green Lane,
Spring Mount, Gilbertsville, Cedarville, Stowe, Shillington,
Boyertown, Pennsburg, Spring City and Mount Penn.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm, and
the storm will affect the beaches. For your safety, immediately move
off the beach and seek shelter indoors.
&&
LAT...LON 4044 7552 4041 7547 4016 7541 4021 7596
4031 7596
TIME...MOT...LOC 1908Z 262DEG 18KT 4025 7586
HAIL...1.00IN
WIND...60MPH
$$
Gorse2 follow-up statements
430
WWUS51 KPHI 211922
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
322 PM EDT Wed Aug 21 2019
PAC011-029-091-212000-
/O.CON.KPHI.SV.W.0375.000000T0000Z-190821T2000Z/
Berks PA-Montgomery PA-Chester PA-
322 PM EDT Wed Aug 21 2019
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR SOUTHEASTERN BERKS...NORTHWESTERN MONTGOMERY AND NORTHEASTERN
CHESTER COUNTIES...
At 321 PM EDT, a severe thunderstorm was located near Birdsboro, or
10 miles southeast of Reading, moving east at 20 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Pottstown, Birdsboro, Collegeville, Royersford, Trappe, East
Greenville, Schwenksville, Bally, Bechtelsville, Green Lane, Spring
Mount, Gilbertsville, Cedarville, Stowe, Boyertown, Pennsburg, Spring
City, Red Hill, St. Lawrence and Pottsgrove.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
&&
LAT...LON 4044 7552 4041 7547 4016 7541 4021 7590
4032 7590
TIME...MOT...LOC 1921Z 261DEG 19KT 4027 7575
HAIL...1.00IN
WIND...60MPH
$$
Gorse600
WWUS51 KPHI 211942
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
342 PM EDT Wed Aug 21 2019
PAC011-029-091-211952-
/O.CAN.KPHI.SV.W.0375.000000T0000Z-190821T2000Z/
Berks PA-Montgomery PA-Chester PA-
342 PM EDT Wed Aug 21 2019
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BERKS...
NORTHWESTERN MONTGOMERY AND NORTHEASTERN CHESTER COUNTIES IS
CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However small hail and
gusty winds are still possible with this thunderstorm.
A severe thunderstorm watch remains in effect until 1000 PM EDT for
eastern and southeastern Pennsylvania.
LAT...LON 4044 7552 4041 7547 4016 7541 4021 7590
4032 7590
TIME...MOT...LOC 1938Z 262DEG 18KT 4028 7561
$$
GorseThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 3:01 PM EDT | Special Weather Statement | PHI | Berks | 29 min |
| Aug 21, 4:07 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Montgomery | 38 min |
| Aug 21, 7:58 PM EDT | Special Weather Statement | PHI | Chester | 47 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2019Every severe thunderstorm warning in 2019
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.