Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 74, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 23, 2020, 6:12 PM EDT for Chester County, Delaware County, Pennsylvania; New Castle County, Delaware; Gloucester County, Salem County, New Jersey. It was in force for 48 min. 1 report 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
- Jun 23, 2020, 6:12 PM EDT (22:12 UTC)
- Expired
- Jun 23, 2020, 7:00 PM EDT
- In force
- 48 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA
The radar
The Philadelphia radar (KDIX), 105 km from the middle of the area, began a volume at 22:14 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 |
|---|---|---|---|
| Jun 23, 6:16 PM EDT | HAIL 0.7 | 1 Se Brookside, DE | PEA TO DIME SIZE HAIL. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 10.2 hours before the alert went out and 178 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
- 9 J/kg
- Mixed-layer CIN
- -145 J/kg
- Mixed-layer LCL
- 1155 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 100 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
976
WUUS51 KPHI 232212
SVRPHI
DEC003-NJC015-033-PAC029-045-232300-
/O.NEW.KPHI.SV.W.0074.200623T2212Z-200623T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
612 PM EDT Tue Jun 23 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northern New Castle County in northern Delaware...
Northwestern Salem County in southern New Jersey...
Northwestern Gloucester County in southern New Jersey...
Southeastern Chester County in southeastern Pennsylvania...
Southwestern Delaware County in southeastern Pennsylvania...
* Until 700 PM EDT.
* At 611 PM EDT, a severe thunderstorm was located over Bear, or near
Newark, moving northeast at 20 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...
Wilmington, Newark, Elkton, Chester, Pennsville, Westtown, Carneys
Point, Elsmere, New Castle, Penns Grove, Newport, Arden, Stanton,
Cheyney, North Star, Glasgow, Bear, Talleyville, Wilmington Manor
and Elam.
This includes the following highways...
Interstate 95 in Pennsylvania between mile markers 0 and 4.
Interstate 95 in Delaware between mile markers 0 and 23.
Interstate 295 in New Jersey mile marker 0 and near mile marker 14.
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 this storm. Move indoors
immediately. 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 3998 7557 3981 7530 3955 7571 3960 7579
3969 7579
TIME...MOT...LOC 2211Z 220DEG 19KT 3965 7571
HAIL...1.00IN
WIND...60MPH
$$
Staarmann2 follow-up statements
534
WWUS51 KPHI 232236
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
636 PM EDT Tue Jun 23 2020
DEC003-NJC015-033-PAC029-045-232300-
/O.CON.KPHI.SV.W.0074.000000T0000Z-200623T2300Z/
New Castle DE-Salem NJ-Gloucester NJ-Chester PA-Delaware PA-
636 PM EDT Tue Jun 23 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR NORTHERN NEW CASTLE...NORTHWESTERN SALEM...NORTHWESTERN
GLOUCESTER...SOUTHEASTERN CHESTER AND SOUTHWESTERN DELAWARE
COUNTIES...
At 636 PM EDT, a severe thunderstorm was located over Stanton, or
near Newark, moving northeast at 15 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...
Wilmington, Newark, Chester, Westtown, Carneys Point, Elsmere, New
Castle, Penns Grove, Newport, Arden, Stanton, Cheyney, Talleyville,
Wilmington Manor, Elam, Pike Creek, Chelsea, Ashland, Greenville and
Chester Township.
This includes the following highways...
Interstate 95 in Pennsylvania between mile markers 0 and 4.
Interstate 95 in Delaware between mile markers 3 and 23.
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 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 3998 7557 3981 7530 3962 7565 3964 7573
3969 7576
TIME...MOT...LOC 2236Z 222DEG 13KT 3968 7567
HAIL...1.00IN
WIND...60MPH
$$
Staarmann093
WWUS51 KPHI 232253
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
653 PM EDT Tue Jun 23 2020
DEC003-NJC015-033-PAC029-045-232303-
/O.EXP.KPHI.SV.W.0074.000000T0000Z-200623T2300Z/
New Castle DE-Salem NJ-Gloucester NJ-Chester PA-Delaware PA-
653 PM EDT Tue Jun 23 2020
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN NEW CASTLE...
NORTHWESTERN SALEM...NORTHWESTERN GLOUCESTER...SOUTHEASTERN CHESTER
AND SOUTHWESTERN DELAWARE COUNTIES WILL EXPIRE AT 700 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 small
hail, gusty winds, and heavy rain are still possible with this
thunderstorm.
LAT...LON 3998 7557 3981 7530 3962 7565 3964 7573
3969 7576
TIME...MOT...LOC 2253Z 220DEG 19KT 3974 7561
$$
StaarmannThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 22, 9:18 PM EDT | Areal Flood Advisory | PHI | Bucks | 3 hr |
| Jun 23, 7:09 PM EDT | Special Weather Statement | PHI | Delaware | 36 min |
| Jun 22, 8:48 PM EDT | Special Weather Statement | PHI | Mercer | 42 min |
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.