Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 133, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 6, 2020, 5:20 PM EDT for Chester County, Delaware County, Pennsylvania. It was in force for 42 min. 3 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, 5:20 PM EDT (21:20 UTC)
- Expired
- Jul 6, 2020, 6:02 PM EDT
- In force
- 42 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
The radar
The Philadelphia radar (KDIX), 105 km from the middle of the area, began a volume at 21:19 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, 5:25 PM EDT | TSTM WND GST 50 | Pocopson, PA | WIRES DOWN NEAR THE INTERSECTION OF WEST STREET ROAD AND CREEK ROAD. TIME ESTIMATED FROM RADAR. |
| Jul 6, 5:27 PM EDT | TSTM WND GST 58 | 1 Sw Birmingham Twp, PA | TREE AND WIRES DOWN NEAR THE INTERSECTION OF MEETINGHOUSE ROAD AND CREEK ROAD NORTH OF CHADDS FORD. TIME ESTIMATED FROM RADAR. |
| Jul 6, 5:32 PM EDT | TSTM WND DMG | Pennsbury Twp, PA | MULTIPLE REPORTS OF TREES DOWN INTO WIRES ON US-1. 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, 9.3 hours before the alert went out and 194 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.
046
WUUS51 KPHI 062120
SVRPHI
PAC029-045-062215-
/O.NEW.KPHI.SV.W.0133.200706T2120Z-200706T2215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
520 PM EDT Mon Jul 6 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Central Chester County in southeastern Pennsylvania...
Central Delaware County in southeastern Pennsylvania...
* Until 615 PM EDT.
* At 519 PM EDT, a severe thunderstorm was located over West Chester,
moving southeast at 10 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
West Chester, Coatesville, Westtown, Downingtown, Honey Brook,
Elverson, Cheyney, Pughtown, Elam, Marshallton, Lima, Trout Lake,
Chelsea, Radnor Township, Lionville-Marchwood, Gradyville,
Broomall, Glenmoore, Paoli and Chester Springs.
This includes the following highways...
Pennsylvania Turnpike between mile markers 300 and 324.
Interstate 476 in Pennsylvania between mile markers 4 and 13.
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.
&&
LAT...LON 4014 7587 4021 7576 4004 7534 4002 7532
4002 7531 4000 7530 3985 7541 3985 7562
4003 7594 4004 7593 4011 7594
TIME...MOT...LOC 2119Z 311DEG 9KT 3995 7561
HAIL...0.75IN
WIND...60MPH
$$
BAH2 follow-up statements
013
WWUS51 KPHI 062151
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
551 PM EDT Mon Jul 6 2020
PAC029-045-062215-
/O.CON.KPHI.SV.W.0133.000000T0000Z-200706T2215Z/
Chester PA-Delaware PA-
551 PM EDT Mon Jul 6 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR CENTRAL CHESTER AND SOUTHWESTERN DELAWARE COUNTIES...
At 549 PM EDT, a severe thunderstorm was located over Concordville,
or near West Chester, moving southeast at 10 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
West Chester, Westtown, Downingtown, Gradyville, Cheyney, Elam,
Marshallton, Lima, Concordville, Chelsea, Nether Providence Township,
Chester Township, West Goshen, Brookhaven, Media, Chester Heights,
South Coatesville, Springfield, Rose Valley and Modena.
This includes Interstate 476 in Pennsylvania between mile markers 4
and 5.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of
a building.
&&
LAT...LON 3985 7541 3985 7562 3996 7582 4002 7574
3994 7534
TIME...MOT...LOC 2149Z 311DEG 9KT 3990 7554
HAIL...0.75IN
WIND...60MPH
$$
BAH292
WWUS51 KPHI 062202 RRA
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
602 PM EDT Mon Jul 6 2020
PAC029-045-062212-
/O.CAN.KPHI.SV.W.0133.000000T0000Z-200706T2215Z/
Chester PA-Delaware PA-
602 PM EDT Mon Jul 6 2020
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CHESTER AND
SOUTHWESTERN DELAWARE 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.
A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
southeastern Pennsylvania.
LAT...LON 3985 7541 3985 7562 3996 7582 4002 7574
3994 7534
TIME...MOT...LOC 2159Z 311DEG 9KT 3988 7551
$$
BAHThe 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, 3:11 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 49 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, 5:29 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.