Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2024
Severe Thunderstorm Warning 145, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 17, 2024, 2:16 PM EDT for Berks County, Chester County, Montgomery County, Pennsylvania. It was in force for 59 min. 10 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
- Jul 17, 2024, 2:16 PM EDT (18:16 UTC)
- Expired
- Jul 17, 2024, 3:15 PM EDT
- In force
- 59 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), 120 km from the middle of the area, began a volume at 18:17 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 |
|---|---|---|---|
| Jul 17, 2:42 PM EDT | TSTM WND DMG | 1 Ene East Brandywine T, PA | Photos of large limbs and a few trees down near Corner Ketch Rd and Rolling Glenn Lane. Time estimated. |
| Jul 17, 2:49 PM EDT | TSTM WND DMG | Exton, PA | Several photos of many large tree limbs and a few trees snapped in Exton. Time estimated. |
| Jul 17, 2:52 PM EDT | TSTM WND GST 67 | 1 Nne East Caln Twp, PA | Trained spotter measures wind gust of 66.8 mph on a mounted ATMOS 41 research weather station. Also reports of powerlines and poles down along Creekside Dr. |
| Jul 17, 2:54 PM EDT | TSTM WND GST 48 | 2 Wsw Upper Uwchlan Twp, PA | Marsh Creek - XMAR WxFlow Site. |
| Jul 17, 2:55 PM EDT | TSTM WND GST 46 | 1 Nnw West Goshen, PA | AWOS station KOQN West Chester. |
| Jul 17, 2:59 PM EDT | TSTM WND DMG | Chester Springs, PA | Multiple reports of large trees down all around Chester Springs area. Time estimated from radar. |
| Jul 17, 3:00 PM EDT | TSTM WND DMG | Malvern, PA | Trees and wires down. Time estimated from radar. |
| Jul 17, 3:01 PM EDT | TSTM WND GST 71 | 2 Se Exton, PA | Last physical read via physical anemometer was 71 mph, however, shut off before the peak wind. Severe winds lasted for 4 minutes and 30 seconds. Significant uprooting of trees, damage to house, telephone electric pole uprooted on Kirkland Avenue. Photos show a |
| Jul 17, 3:11 PM EDT | TSTM WND DMG | 1 Wnw Chesterbrook, PA | Received photos of a large tree that fell down on backyard deck with multiple other trees down on roads. Time estimated. |
| Jul 17, 3:14 PM EDT | TSTM WND DMG | 1 Ne Valley Forge, PA | Delayed report from last week. NWS employee relayed photos of several large trees uprooted and snapped on a trail in Valley Forge National Historical Park. Other tree damage in the area as well. Time estimated. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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 17, 12:58 PM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 6.3 hours before the alert went out and 185 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
- 88 J/kg
- Mixed-layer CIN
- -120 J/kg
- Mixed-layer LCL
- 1518 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- -22 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
816
WUUS51 KPHI 171816
SVRPHI
PAC011-029-091-171915-
/O.NEW.KPHI.SV.W.0145.240717T1816Z-240717T1915Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
216 PM EDT Wed Jul 17 2024
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...
Chester County in southeastern Pennsylvania...
* Until 315 PM EDT.
* At 215 PM EDT, severe thunderstorms were located along a line
extending from near Terre Hill to near New Holland to near Gap,
moving east at 30 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...
West Chester, Pottstown, Phoenixville, Coatesville, Downingtown,
Birdsboro, Collegeville, Royersford, Parkesburg, Trappe, Honey
Brook, Schwenksville, Elverson, Green Lane, New Morgan,
Cochranville, Pughtown, Marshallton, Spring Mount, and
Lionville-Marchwood.
This includes the following highways...
Pennsylvania Turnpike between mile markers 296 and 323.
Interstate 176 in Pennsylvania between mile markers 1 and 8.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with these storms. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.
&&
LAT...LON 4036 7547 4011 7544 3988 7559 3989 7599
3992 7600 3994 7598 3995 7600 4004 7593
4011 7594 4014 7588 4024 7603
TIME...MOT...LOC 1815Z 261DEG 26KT 4014 7602 4006 7602 3997 7607
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Staarmann3 follow-up statements
343
WWUS51 KPHI 171832
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
232 PM EDT Wed Jul 17 2024
PAC011-029-091-171915-
/O.CON.KPHI.SV.W.0145.000000T0000Z-240717T1915Z/
Berks PA-Montgomery PA-Chester PA-
232 PM EDT Wed Jul 17 2024
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR SOUTHEASTERN BERKS...NORTHWESTERN MONTGOMERY AND CHESTER
COUNTIES...
At 232 PM EDT, severe thunderstorms were located along a line
extending from Elverson to near Honey Brook to Parkesburg, moving
east at 30 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
West Chester, Pottstown, Phoenixville, Coatesville, Downingtown,
Birdsboro, Collegeville, Royersford, Parkesburg, Trappe, Honey Brook,
Schwenksville, Elverson, Green Lane, New Morgan, Cochranville,
Pughtown, Marshallton, Spring Mount, and Lionville-Marchwood.
This includes the following highways...
Pennsylvania Turnpike between mile markers 296 and 323.
Interstate 176 in Pennsylvania between mile markers 1 and 8.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 4036 7547 4011 7544 3988 7559 3989 7599
3992 7600 3994 7598 3995 7600 4004 7593
4011 7594 4014 7588 4024 7603
TIME...MOT...LOC 1832Z 260DEG 27KT 4017 7585 4008 7584 3997 7591
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Staarmann975
WWUS51 KPHI 171848
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
248 PM EDT Wed Jul 17 2024
PAC011-171857-
/O.CAN.KPHI.SV.W.0145.000000T0000Z-240717T1915Z/
Berks PA-
248 PM EDT Wed Jul 17 2024
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BERKS COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
eastern and southeastern Pennsylvania.
LAT...LON 4004 7593 4011 7594 4014 7587 4023 7571
4033 7563 4036 7547 4011 7544 3988 7559
3989 7599 3992 7600 3994 7598 3995 7600
TIME...MOT...LOC 1847Z 264DEG 26KT 4004 7570
$$
PAC029-091-171915-
/O.CON.KPHI.SV.W.0145.000000T0000Z-240717T1915Z/
Montgomery PA-Chester PA-
248 PM EDT Wed Jul 17 2024
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR NORTHWESTERN MONTGOMERY AND CHESTER COUNTIES...
At 247 PM EDT, a severe thunderstorm was located over Downingtown, or
7 miles northwest of West Chester, moving east at 30 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
West Chester, Pottstown, Phoenixville, Coatesville, Downingtown,
Collegeville, Royersford, Parkesburg, Trappe, Honey Brook,
Schwenksville, Elverson, Green Lane, Cochranville, Pughtown,
Marshallton, Spring Mount, Lionville-Marchwood, Valley Forge, and
Glenmoore.
This includes Pennsylvania Turnpike between mile markers 301 and 323.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4004 7593 4011 7594 4014 7587 4023 7571
4033 7563 4036 7547 4011 7544 3988 7559
3989 7599 3992 7600 3994 7598 3995 7600
TIME...MOT...LOC 1847Z 264DEG 26KT 4004 7570
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Staarmann524
WWUS51 KPHI 171903
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
303 PM EDT Wed Jul 17 2024
PAC029-091-171915-
/O.CON.KPHI.SV.W.0145.000000T0000Z-240717T1915Z/
Montgomery PA-Chester PA-
303 PM EDT Wed Jul 17 2024
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR WEST CENTRAL MONTGOMERY AND CENTRAL CHESTER COUNTIES...
At 303 PM EDT, a severe thunderstorm was located near Chester
Springs, or 8 miles north of West Chester, moving east at 35 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...
West Chester, Pottstown, Phoenixville, Coatesville, Downingtown,
Collegeville, Royersford, Trappe, Schwenksville, Pughtown,
Marshallton, Spring Mount, Lionville-Marchwood, Valley Forge,
Glenmoore, Paoli, Chester Springs, Lionville, Cedarville, and West
Goshen.
This includes Pennsylvania Turnpike between mile markers 302 and 323.
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.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4004 7587 4017 7581 4023 7571 4026 7562
4030 7546 4011 7544 3988 7559 3989 7587
TIME...MOT...LOC 1903Z 264DEG 30KT 4007 7556
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
StaarmannThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 16, 8:05 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 70 min |
| Jul 16, 8:13 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 62 min |
| Jul 16, 8:23 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 67 min |
| Jul 16, 9:04 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 56 min |
| Jul 17, 3:05 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 39 min |
| Jul 17, 5:51 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 54 min |
| Jul 17, 6:18 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe | 57 min |
| Jul 17, 6:40 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 65 min |
| Jul 17, 7:06 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 54 min |
| Jul 17, 7:18 PM EDT | Flash Flood Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 2 hr |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2024Every severe thunderstorm warning in 2024
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.