Alert archive / Delaware / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 73, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 22, 2020, 7:25 PM EDT for New Castle County, Delaware; Chester County, Pennsylvania; Cecil County, Maryland. It was in force for 22 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
- Jun 22, 2020, 7:25 PM EDT (23:25 UTC)
- Expired
- Jun 22, 2020, 7:47 PM EDT
- In force
- 22 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Cecil County, MD, Chester County, PA
The radar
The Dover AFB radar (KDOX), 106 km from the middle of the area, began a volume at 23:26 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 nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.4 hours before the alert went out and 145 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
- 333 J/kg
- Mixed-layer CIN
- -93 J/kg
- Mixed-layer LCL
- 968 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
862
WUUS51 KPHI 222325
SVRPHI
DEC003-MDC015-PAC029-230000-
/O.NEW.KPHI.SV.W.0073.200622T2325Z-200623T0000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
725 PM EDT Mon Jun 22 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
West central New Castle County in northern Delaware...
Cecil County in northeastern Maryland...
Southwestern Chester County in southeastern Pennsylvania...
* Until 800 PM EDT.
* At 724 PM EDT, a severe thunderstorm was located over Charlestown,
or 7 miles west of Elkton, moving north 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...
Newark, Elkton, Calvert, Oxford, North East, Rising Sun,
Charlestown, Homeville, Glen Roy, Zion, Blake, Barksdale, Glasgow,
Bear, West Nottingham, Brantwood, Mount Vernon, Fair Hill, Glen
Westover and Bay View.
This includes the following highways...
Interstate 95 in Delaware between mile markers 0 and 4.
Interstate 95 in Maryland between mile markers 92 and 109.
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 3978 7606 3981 7603 3983 7604 3983 7602
3986 7601 3987 7598 3959 7561 3940 7594
3947 7600 3952 7598 3955 7603 3955 7606
3961 7612
TIME...MOT...LOC 2324Z 196DEG 12KT 3959 7595
HAIL...1.00IN
WIND...60MPH
$$
Davis2 follow-up statements
942
WWUS51 KPHI 222339
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
739 PM EDT Mon Jun 22 2020
DEC003-MDC015-PAC029-230000-
/O.CON.KPHI.SV.W.0073.000000T0000Z-200623T0000Z/
New Castle DE-Cecil MD-Chester PA-
739 PM EDT Mon Jun 22 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR WEST CENTRAL NEW CASTLE...NORTHEASTERN CECIL AND SOUTHWESTERN
CHESTER COUNTIES...
At 739 PM EDT, a severe thunderstorm was located over Bay View, or
near Elkton, moving north at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Newark, Elkton, Calvert, Oxford, North East, Rising Sun, Charlestown,
Homeville, Glen Roy, Zion, Blake, Barksdale, Glasgow, Bear, West
Nottingham, Brantwood, Mount Vernon, Fair Hill, Glen Westover and Bay
View.
This includes the following highways...
Interstate 95 in Delaware between mile markers 0 and 4.
Interstate 95 in Maryland between mile markers 95 and 109.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3978 7606 3981 7603 3983 7604 3983 7602
3986 7601 3987 7598 3959 7561 3946 7584
3952 7597 3964 7609
TIME...MOT...LOC 2339Z 196DEG 12KT 3964 7593
HAIL...1.00IN
WIND...60MPH
$$
Davis977
WWUS51 KPHI 222347
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
747 PM EDT Mon Jun 22 2020
DEC003-MDC015-PAC029-222357-
/O.CAN.KPHI.SV.W.0073.000000T0000Z-200623T0000Z/
New Castle DE-Cecil MD-Chester PA-
747 PM EDT Mon Jun 22 2020
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL NEW CASTLE...
NORTHEASTERN CECIL AND SOUTHWESTERN CHESTER 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. However, heavy rain and
minor flooding is still possible with this thunderstorm.
LAT...LON 3978 7606 3981 7603 3983 7604 3983 7602
3986 7601 3987 7598 3959 7561 3946 7584
3952 7597 3964 7609
TIME...MOT...LOC 2344Z 196DEG 12KT 3967 7592
$$
DavisThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 22, 7:01 PM EDT | Special Weather Statement | PHI | Sussex | 44 min |
| Jun 22, 7:08 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 15 min |
| Jun 22, 7:52 PM EDT | Areal Flood Advisory | PHI | Chester | 109 min |
| Jun 22, 5:37 PM EDT | Special Weather Statement | PHI | Talbot | 38 min |
| Jun 22, 7:08 PM EDT | Special Weather Statement | PHI | Cecil | 37 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2020Severe Thunderstorm Warnings in Pennsylvania, 2020Severe Thunderstorm Warnings in Maryland, 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.