Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 118, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 6, 2020, 3:11 PM EDT for 4 counties in Pennsylvania. It was in force for 49 min. 9 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 6, 2020, 3:11 PM EDT (19:11 UTC)
- Expired
- Jul 6, 2020, 4:00 PM EDT
- In force
- 49 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 89 km from the middle of the area, began a volume at 19:13 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 6, 3:15 PM EDT | HAIL 1 | 1 N Oaks, PA | MULTIPLE REPORTS OF HAIL NEAR COLLEGEVILLE, WITH A PHOTO OF HAIL UP TO QUARTER SIZE. |
| Jul 6, 3:15 PM EDT | HAIL 1.25 | Phoenixville, PA | REPORT VIA SOCIAL MEDIA WITH PHOTOS OF HAIL A LITTLE LARGER THAN QUARTER SIZE. |
| Jul 6, 3:29 PM EDT | TSTM WND DMG | 1 Ssw Spring City, PA | SEVERAL REPORTS OF TREES AND WIRES DOWN IN SPRING CITY, ROYERSFORD, PHOENIXVILLE, AND UPPER PROVIDENCE TWP. TIME ESTIMATED FROM RADAR. |
| Jul 6, 3:30 PM EDT | TSTM WND DMG | Lower Providence Townsh, PA | TREE DOWN ON WIRES ON PAWLINGS ROAD. TIME ESTIMATED FROM RADAR. |
| Jul 6, 3:30 PM EDT | HAIL 1.25 | 1 E Oaks, PA | REPORT VIA SOCIAL MEDIA WITH PHOTOS AND VIDEO OF HAIL UP TO ABOUT HALF DOLLAR SIZE NEAR AUDUBON. TIME ESTIMATED FROM RADAR. |
| Jul 6, 3:37 PM EDT | TSTM WND DMG | 1 Wsw Valley Forge, PA | SEVERAL REPORTS OF TREES AND WIRES DOWN IN THE VALLEY FORGE AREA, INCLUDING NEAR OAKWOOD LANE, VALLEY PARK ROAD, JUG HOLLOW ROAD, AND DAVIS ROAD. TIME ESTIMATED FROM RADAR. |
| Jul 6, 3:37 PM EDT | TSTM WND DMG | 1 Wsw Valley Forge, PA | SEVERAL REPORTS OF TREES AND WIRES DOWN IN VICINITY OF OAKWOOD LANE, DAVIS ROAD, JUG HOLLOW ROAD, AND VALLEY PARK ROAD. TIME ESTIMATED FROM RADAR. |
| Jul 6, 3:58 PM EDT | TSTM WND DMG | 1 Ese Devault, PA | DOWNED TREE ON COOL VALLEY ROAD NEAR SHADOW OAK DRIVE IN DEVAULT. TIME ESTIMATED FROM RADAR. |
| Jul 6, 4:06 PM EDT | TSTM WND DMG | Valley Forge, PA | TREE DOWN NEAR RICHARDS ROAD AND STEPHENS DRIVE, BLOCKING RICHARDS ROAD NEAR VALLEY FORGE. TIME ESTIMATED FROM RADAR. |
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 6, 1:38 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.2 hours before the alert went out and 209 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
- 1250 J/kg
- Mixed-layer CIN
- -133 J/kg
- Mixed-layer LCL
- 1150 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
588
WUUS51 KPHI 061911
SVRPHI
PAC029-045-091-101-062000-
/O.NEW.KPHI.SV.W.0118.200706T1911Z-200706T2000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
311 PM EDT Mon Jul 6 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southwestern Montgomery County in southeastern Pennsylvania...
Northeastern Chester County in southeastern Pennsylvania...
West central Philadelphia County in southeastern Pennsylvania...
Northeastern Delaware County in southeastern Pennsylvania...
* Until 400 PM EDT.
* At 310 PM EDT, severe thunderstorms were located along a line
extending from Phoenixville to Plymouth Meeting, moving south at 5
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...
Philadelphia, Norristown, Phoenixville, West Norriton, East
Norriton, Conshohocken, Collegeville, Royersford, Narberth, Trappe,
Bryn Mawr, Trout Lake, Radnor Township, Valley Forge, Plymouth
Meeting, Paoli, King Of Prussia, Bridgeport, Spring City and
Malvern.
This includes the following highways...
Pennsylvania Turnpike between mile markers 317 and 335.
Northeast Extension between mile markers 21 and 26.
Interstate 76 in Pennsylvania between mile markers 327 and 337.
Interstate 476 in Pennsylvania between mile markers 10 and 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
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 3998 7558 4000 7523 4020 7525 4019 7559
TIME...MOT...LOC 1910Z 341DEG 5KT 4011 7552 4011 7525
HAIL...1.00IN
WIND...60MPH
$$
Robertson1 follow-up statement
780
WWUS51 KPHI 061934
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
334 PM EDT Mon Jul 6 2020
PAC029-045-091-101-062000-
/O.CON.KPHI.SV.W.0118.000000T0000Z-200706T2000Z/
Montgomery PA-Chester PA-Philadelphia PA-Delaware PA-
334 PM EDT Mon Jul 6 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR SOUTHWESTERN MONTGOMERY...NORTHEASTERN CHESTER...WEST CENTRAL
PHILADELPHIA AND NORTHEASTERN DELAWARE COUNTIES...
At 334 PM EDT, severe thunderstorms were located along a line
extending from near Royersford to Conshohocken, and are nearly
stationary.
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...
Philadelphia, Norristown, Phoenixville, West Norriton, East Norriton,
Conshohocken, Collegeville, Royersford, Narberth, Trappe, Bryn Mawr,
Trout Lake, Radnor Township, Valley Forge, Plymouth Meeting, Paoli,
King Of Prussia, Bridgeport, Spring City and Malvern.
This includes the following highways...
Pennsylvania Turnpike between mile markers 317 and 335.
Northeast Extension between mile markers 21 and 26.
Interstate 76 in Pennsylvania between mile markers 327 and 337.
Interstate 476 in Pennsylvania between mile markers 10 and 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
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 3998 7552 4000 7558 4019 7559 4020 7531
4019 7525 4000 7523
TIME...MOT...LOC 1934Z 328DEG 3KT 4017 7557 4007 7531
HAIL...1.00IN
WIND...60MPH
$$
RobertsonThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 3:16 AM EDT | Heat Advisory | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 12 hr |
| Jul 6, 12:34 PM EDT | Special Weather Statement | PHI | Philadelphia | 26 min |
| Jul 6, 12:45 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 60 min |
| Jul 6, 12:52 PM EDT | Flash Flood Watch | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 8 hr |
| Jul 6, 12:57 PM EDT | Areal Flood Advisory | PHI | Bucks, Delaware, Montgomery, Philadelphia | 2 hr |
| Jul 6, 1:08 PM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| Jul 6, 1:15 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 60 min |
| Jul 6, 1:20 PM EDT | Special Weather Statement | PHI | Montgomery | 25 min |
| Jul 6, 1:24 PM EDT | Special Weather Statement | PHI | Monroe | 36 min |
| Jul 6, 1:43 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 62 min |
| Jul 6, 1:44 PM EDT | Special Weather Statement | PHI | Montgomery | 31 min |
| Jul 6, 1:50 PM EDT | Areal Flood Advisory | PHI | Berks, Chester, Montgomery | 4 hr |
| Jul 6, 1:50 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 40 min |
| Jul 6, 2:02 PM EDT | Areal Flood Advisory | PHI | Bucks | 118 min |
| Jul 6, 2:04 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 41 min |
| Jul 6, 2:10 PM EDT | Areal Flood Advisory | PHI | Monroe | 2 hr |
| Jul 6, 2:18 PM EDT | Special Weather Statement | PHI | Montgomery | 27 min |
| Jul 6, 2:27 PM EDT | Severe Thunderstorm Warning | PHI | Montgomery | 48 min |
| Jul 6, 2:28 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 28 min |
| Jul 6, 2:39 PM EDT | Areal Flood Advisory | PHI | Bucks, Chester, Montgomery | 4 hr |
| Jul 6, 2:39 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 66 min |
| Jul 6, 2:41 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 49 min |
| Jul 6, 2:48 PM EDT | Areal Flood Advisory | PHI | Philadelphia | 4 hr |
| Jul 6, 2:51 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery | 24 min |
| Jul 6, 2:57 PM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| Jul 6, 3:00 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Northampton | 45 min |
| Jul 6, 3:38 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Northampton | 52 min |
| Jul 6, 3:52 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 38 min |
| Jul 6, 3:56 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 64 min |
| Jul 6, 4:06 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh | 24 min |
| Jul 6, 4:07 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery | 4 hr |
| Jul 6, 4:31 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Monroe, Northampton | 44 min |
| Jul 6, 4:51 PM EDT | Areal Flood Advisory | PHI | Carbon, Monroe | 114 min |
| Jul 6, 5:00 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 45 min |
| Jul 6, 5:01 PM EDT | Areal Flood Advisory | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 119 min |
| Jul 6, 5:14 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 61 min |
| Jul 6, 5:17 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 43 min |
| Jul 6, 5:20 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 42 min |
| Jul 6, 5:29 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 46 min |
| Jul 6, 5:43 PM EDT | Areal Flood Advisory | PHI | Chester, Delaware | 3 hr |
| Jul 6, 5:53 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery | 52 min |
| Jul 6, 6:13 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 48 min |
| Jul 6, 6:14 PM EDT | Areal Flood Advisory | PHI | Berks, Chester, Montgomery | 3 hr |
| Jul 6, 6:18 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 35 min |
| Jul 6, 6:54 PM EDT | Flash Flood Warning | PHI | Berks, Chester, Montgomery | 109 min |
| Jul 6, 7:18 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 36 min |
| Jul 6, 7:36 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 69 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2020Every severe thunderstorm warning in 2020
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.