Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 31, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 13, 2020, 2:41 PM EDT for 4 states. It was in force for 64 min. 2 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
- Apr 13, 2020, 2:41 PM EDT (18:41 UTC)
- Expired
- Apr 13, 2020, 3:45 PM EDT
- In force
- 64 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Cecil County, MD, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA
The radar
The Dover AFB radar (KDOX), 94 km from the middle of the area, began a volume at 18:45 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 |
|---|---|---|---|
| Apr 13, 3:39 PM EDT | NON-TSTM WND GST 10 | 1 W Ashland, DE | MESONET STATION AR506 HOCKESSIN. |
| Apr 13, 3:44 PM EDT | TSTM WND DMG | 1 Nw Pilesgrove Twp, NJ | LARGE LIMB DOWN ON POINTERS AUBURN ROAD. 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 |
|---|---|---|---|
| Apr 13, 11:33 AM EDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 6.7 hours before the alert went out and 156 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.
323
WUUS51 KPHI 131841
SVRPHI
DEC003-MDC015-NJC015-033-PAC029-045-131945-
/O.NEW.KPHI.SV.W.0031.200413T1841Z-200413T1945Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
241 PM EDT Mon Apr 13 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
New Castle County in northern Delaware...
Cecil County in northeastern Maryland...
Western Salem County in southern New Jersey...
Northwestern Gloucester County in southern New Jersey...
Southern Chester County in southeastern Pennsylvania...
Delaware County in southeastern Pennsylvania...
* Until 345 PM EDT.
* At 239 PM EDT, severe thunderstorms were located along a line
extending from Churchtown to Severn, moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Wilmington, Newark, Middletown, West Chester, Elkton, Calvert,
Chester, Pennsville, Coatesville, Westtown, Smyrna, Carneys Point,
Downingtown, Folcroft, Swarthmore, Elsmere, Paulsboro, Kennett
Square, New Castle and Penns Grove.
People attending Covid-19 Drive through testing should seek safe
shelter immediately!
This includes the following highways...
Interstate 295 in New Jersey between mile markers 0 and 17.
Interstate 95 in Pennsylvania between mile markers 0 and 12.
Interstate 95 in Maryland between mile markers 91 and 109.
New Jersey Turnpike near exit 1.
Interstate 95 in Delaware between mile markers 0 and 23.
Interstate 476 in Pennsylvania between mile markers 0 and 7.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 600 PM EDT for central and
northern Delaware...northeastern Maryland...southern New Jersey...and
southeastern Pennsylvania.
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3972 7623 3973 7610 3976 7606 3987 7599
3995 7600 4007 7593 4002 7578 3998 7535
3987 7523 3945 7542 3932 7544 3936 7551
3935 7556 3931 7558 3929 7576 3938 7577
3938 7605 3943 7600 3952 7598 3955 7608
TIME...MOT...LOC 1839Z 285DEG 33KT 4012 7598 3914 7667
HAIL...<.75IN
WIND...60MPH
$$
NC2 follow-up statements
006
WWUS51 KPHI 131919
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
319 PM EDT Mon Apr 13 2020
DEC003-MDC015-NJC015-033-PAC029-045-131945-
/O.CON.KPHI.SV.W.0031.000000T0000Z-200413T1945Z/
New Castle DE-Cecil MD-Salem NJ-Gloucester NJ-Chester PA-Delaware PA-
319 PM EDT Mon Apr 13 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR NEW CASTLE...CECIL...WESTERN SALEM...NORTHWESTERN GLOUCESTER...
SOUTHEASTERN CHESTER AND DELAWARE COUNTIES...
At 318 PM EDT, severe thunderstorms were located along a line
extending from near Paoli to Overton, moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Wilmington, Newark, Middletown, West Chester, Elkton, Chester,
Pennsville, Westtown, Smyrna, Carneys Point, Folcroft, Swarthmore,
Elsmere, Paulsboro, Kennett Square, New Castle, Penns Grove, Salem,
North East and Woodstown.
People attending Covid-19 Drive through testing should seek safe
shelter immediately!
This includes the following highways...
Interstate 295 in New Jersey between mile markers 0 and 17.
Interstate 95 in Pennsylvania between mile markers 0 and 11.
Interstate 95 in Maryland between mile markers 101 and 109.
New Jersey Turnpike near exit 1.
Interstate 95 in Delaware between mile markers 0 and 23.
Interstate 476 in Pennsylvania between mile markers 0 and 7.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 600 PM EDT for central and
northern Delaware...northeastern Maryland...southern New Jersey...and
southeastern Pennsylvania.
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3943 7600 3963 7594 3969 7595 3989 7580
3999 7569 3998 7535 3989 7526 3988 7526
3987 7523 3945 7542 3932 7544 3936 7551
3935 7556 3931 7558 3929 7576 3938 7577
3938 7605
TIME...MOT...LOC 1918Z 285DEG 33KT 4003 7553 3905 7622
HAIL...<.75IN
WIND...60MPH
$$
NC424
WWUS51 KPHI 131943
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
343 PM EDT Mon Apr 13 2020
DEC003-MDC015-NJC015-033-PAC029-045-131953-
/O.EXP.KPHI.SV.W.0031.000000T0000Z-200413T1945Z/
New Castle DE-Cecil MD-Salem NJ-Gloucester NJ-Chester PA-Delaware PA-
343 PM EDT Mon Apr 13 2020
...THE SEVERE THUNDERSTORM WARNING FOR NEW CASTLE...CECIL...WESTERN
SALEM...NORTHWESTERN GLOUCESTER...SOUTHEASTERN CHESTER AND DELAWARE
COUNTIES WILL EXPIRE AT 345 PM EDT...
The storms which prompted the warning have exited the warned area.
Therefore, the warning will be allowed to expire. However, gusty
winds and heavy rain are still possible with these thunderstorms.
A Tornado Watch remains in effect until 600 PM EDT for central and
northern Delaware...northeastern Maryland...southern New Jersey...and
southeastern Pennsylvania.
LAT...LON 3943 7600 3963 7594 3969 7595 3989 7580
3999 7569 3998 7535 3989 7526 3988 7526
3987 7523 3945 7542 3932 7544 3936 7551
3935 7556 3931 7558 3929 7576 3938 7577
3938 7605
TIME...MOT...LOC 1943Z 285DEG 33KT 3997 7526 3899 7595
$$
CMSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 13, 3:43 AM EDT | Coastal Flood Statement | PHI | Sussex | 17 hr |
| Apr 13, 5:12 AM EDT | Special Weather Statement | PHI | Kent, New Castle | 33 min |
| Apr 13, 5:41 AM EDT | Special Weather Statement | PHI | New Castle | 34 min |
| Apr 13, 5:44 AM EDT | Special Weather Statement | PHI | Kent, Sussex | 31 min |
| Apr 13, 6:11 AM EDT | Areal Flood Advisory | PHI | New Castle | 4 hr |
| Apr 13, 6:17 AM EDT | Special Weather Statement | PHI | Kent, New Castle | 28 min |
| Apr 13, 6:42 AM EDT | Areal Flood Advisory | PHI | Kent, New Castle | 4 hr |
| Apr 13, 6:48 AM EDT | Areal Flood Advisory | PHI | New Castle | 4 hr |
| Apr 13, 11:25 AM EDT | River Flood Warning | PHI | New Castle | 4 hr |
| Apr 13, 12:13 PM EDT | River Flood Warning | PHI | New Castle | 3 hr |
| Apr 13, 3:22 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 38 min |
| Apr 13, 3:26 PM EDT | Tornado Warning | PHI | Kent | 13 min |
| Apr 13, 3:40 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 65 min |
| Apr 13, 3:45 PM EDT | Tornado Warning | PHI | Kent | 15 min |
| Apr 13, 4:28 AM EDT | Special Weather Statement | PHI | Kent, Queen Anne's | 32 min |
| Apr 13, 4:45 AM EDT | Special Weather Statement | PHI | Caroline, Talbot | 30 min |
| Apr 13, 2:50 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 55 min |
| 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, 1:27 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 33 min |
| 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, 4:35 PM EDT | Areal Flood Warning | PHI | Montgomery | 2 hr |
| Apr 13, 8:36 AM EDT | Areal Flood Advisory | PHI | Hunterdon, Middlesex, Morris, Somerset | 4 hr |
| Apr 13, 10:29 AM EDT | Areal Flood Warning | PHI | Hunterdon, Somerset | 7 hr |
| Apr 13, 3:52 PM EDT | Special Marine Warning | PHI | 23 min | |
| Apr 13, 4:13 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Cape May, Cumberland | 31 min |
| Apr 13, 6:32 PM EDT | Small Craft Advisory | PHI | 21 hr |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2020Severe Thunderstorm Warnings in New Jersey, 2020Severe Thunderstorm Warnings in Delaware, 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.