Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 30, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 13, 2020, 1:27 PM EDT for Chester County, Pennsylvania. It was in force for 33 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
- Apr 13, 2020, 1:27 PM EDT (17:27 UTC)
- Expired
- Apr 13, 2020, 2:00 PM EDT
- In force
- 33 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Chester County, PA
The radar
The Philadelphia radar (KDIX), 114 km from the middle of the area, began a volume at 17:27 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 13, 11:33 AM EDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 5.5 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 712 m above ground
- 0-6 km bulk shear
- 75 kt
- 0-1 km storm-relative helicity
- 487 m²/s²
- 0-3 km storm-relative helicity
- 684 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
355
WUUS51 KPHI 131727
SVRPHI
PAC029-131800-
/O.NEW.KPHI.SV.W.0030.200413T1727Z-200413T1800Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
127 PM EDT Mon Apr 13 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Chester County in southeastern Pennsylvania...
* Until 200 PM EDT.
* At 127 PM EDT, a severe thunderstorm was located over Parkesburg,
or 14 miles southeast of New Holland, moving northeast at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
West Chester, Pottstown, Phoenixville, Coatesville, Downingtown,
Kennett Square, Oxford, Royersford, Parkesburg, West Grove, Honey
Brook, Elverson, Homeville, Glen Roy, Cochranville, Pughtown, Mount
Vernon, Marshallton, Lionville-Marchwood and Valley Forge.
This includes Pennsylvania Turnpike between exits 312 and 320.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 600 PM EDT for northern
Delaware...and southeastern Pennsylvania.
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3987 7599 3995 7600 4004 7593 4010 7594
4025 7567 4020 7555 4015 7552 4016 7550
4014 7551 4013 7546 4009 7545 4009 7541
3975 7576 3973 7608 3974 7609
TIME...MOT...LOC 1727Z 229DEG 40KT 3993 7594
HAIL...<.75IN
WIND...60MPH
$$
NC2 follow-up statements
632
WWUS51 KPHI 131746
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
146 PM EDT Mon Apr 13 2020
PAC029-131800-
/O.CON.KPHI.SV.W.0030.000000T0000Z-200413T1800Z/
Chester PA-
146 PM EDT Mon Apr 13 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EDT
FOR CHESTER COUNTY...
At 145 PM EDT, a severe thunderstorm was located over Glenmoore, or
10 miles northwest of West Chester, moving northeast at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
West Chester, Pottstown, Phoenixville, Coatesville, Downingtown,
Kennett Square, Oxford, Royersford, Parkesburg, West Grove, Honey
Brook, Elverson, Homeville, Cochranville, Pughtown, Mount Vernon,
Marshallton, Lionville-Marchwood, Valley Forge and Glenmoore.
This includes Pennsylvania Turnpike between exits 312 and 320.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 600 PM EDT for southeastern
Pennsylvania.
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3987 7599 3995 7600 4004 7593 4010 7591
4025 7567 4020 7555 4015 7552 4016 7550
4014 7551 4013 7546 4009 7545 4009 7541
3983 7573 3976 7602 3981 7603
TIME...MOT...LOC 1745Z 229DEG 40KT 4007 7573
HAIL...<.75IN
WIND...60MPH
$$
NC522
WWUS51 KPHI 131751
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
151 PM EDT Mon Apr 13 2020
PAC029-131801-
/O.EXP.KPHI.SV.W.0030.000000T0000Z-200413T1800Z/
Chester PA-
151 PM EDT Mon Apr 13 2020
...THE SEVERE THUNDERSTORM WARNING FOR CHESTER COUNTY WILL EXPIRE AT
200 PM EDT...
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 will be allowed to expire. However gusty
winds are still possible with this thunderstorm.
A Tornado Watch remains in effect until 600 PM EDT for southeastern
Pennsylvania.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 3987 7599 3995 7600 4004 7593 4010 7591
4025 7567 4020 7555 4015 7552 4016 7550
4014 7551 4013 7546 4009 7545 4009 7541
3983 7573 3976 7602 3981 7603
TIME...MOT...LOC 1751Z 229DEG 40KT 4007 7574
$$
NCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 13, 6:11 AM EDT | Areal Flood Advisory | PHI | Berks, Chester, Delaware, Montgomery | 4 hr |
| Apr 13, 6:48 AM EDT | Areal Flood Advisory | PHI | Delaware, Montgomery, Philadelphia | 4 hr |
| Apr 13, 8:03 AM EDT | Areal Flood Advisory | PHI | Bucks | 4 hr |
| Apr 13, 10:58 AM EDT | River Flood Warning | PHI | Chester | 6 hr |
| Apr 13, 11:09 AM EDT | Areal Flood Warning | PHI | Chester, Delaware | 3 hr |
| Apr 13, 12:29 PM EDT | River Flood Warning | PHI | Chester, Delaware | 12 hr |
| Apr 13, 1:01 PM EDT | Areal Flood Advisory | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 4 hr |
| Apr 13, 1:07 PM EDT | Flash Flood Warning | PHI | Berks, Carbon, Lehigh, Northampton | 4 hr |
| Apr 13, 1:47 PM EDT | Flash Flood Warning | PHI | Chester | 3 hr |
| Apr 13, 2:23 PM EDT | Areal Flood Warning | PHI | Montgomery, Philadelphia | 4 hr |
| Apr 13, 2:37 PM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 2 more | 2 hr |
| Apr 13, 2:41 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 64 min |
| Apr 13, 4:35 PM EDT | Areal Flood Warning | PHI | Montgomery | 2 hr |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.