Alert archive / Delaware / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 263, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 27, 2020, 7:25 PM EDT for Caroline County, Maryland; Kent County, Sussex County, Delaware. It was in force for 35 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
- Aug 27, 2020, 7:25 PM EDT (23:25 UTC)
- Expired
- Aug 27, 2020, 8:00 PM EDT
- In force
- 35 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Kent County, DE, Sussex County, DE, Caroline County, MD
The radar
The Dover AFB radar (KDOX), 26 km from the middle of the area, began a volume at 23:27 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 nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 11.4 hours before the alert went out and 105 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
- 553 J/kg
- Mixed-layer CIN
- -94 J/kg
- Mixed-layer LCL
- 1289 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 77 m²/s²
- 0-3 km storm-relative helicity
- 197 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.5
The text
As transmitted.
950
WUUS51 KPHI 272325
SVRPHI
DEC001-005-MDC011-280000-
/O.NEW.KPHI.SV.W.0263.200827T2325Z-200828T0000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
725 PM EDT Thu Aug 27 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Central Sussex County in southern Delaware...
Southern Kent County in central Delaware...
Caroline County in eastern Maryland...
* Until 800 PM EDT.
* At 724 PM EDT, a cluster of severe thunderstorms were located near
Sandtown, or 14 miles southwest of Dover, moving east 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...
Georgetown, Milford, Seaford, Denton, Harrington, Camden, Lewes,
Federalsburg, Milton, Bridgeville, Greensboro, Ridgely, Ellendale,
Bowers, Goldsboro, Woodside, Viola, Henlopen Acres, Smithville and
Rising Sun-Lebanon.
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 3865 7571 3879 7593 3881 7590 3882 7590
3884 7593 3886 7592 3888 7595 3889 7594
3893 7595 3913 7563 3902 7508 3861 7503
TIME...MOT...LOC 2324Z 272DEG 39KT 3899 7569
HAIL...<.75IN
WIND...60MPH
$$
NC2 follow-up statements
042
WWUS51 KPHI 272341
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
741 PM EDT Thu Aug 27 2020
MDC011-272351-
/O.CAN.KPHI.SV.W.0263.000000T0000Z-200828T0000Z/
Caroline MD-
741 PM EDT Thu Aug 27 2020
...THE SEVERE THUNDERSTORM WARNING FOR CAROLINE COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 3881 7572 3887 7571 3901 7564 3910 7545
3902 7508 3864 7505
TIME...MOT...LOC 2341Z 272DEG 39KT 3898 7544
$$
DEC001-005-280000-
/O.CON.KPHI.SV.W.0263.000000T0000Z-200828T0000Z/
Sussex DE-Kent DE-
741 PM EDT Thu Aug 27 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR NORTHERN SUSSEX AND SOUTHERN KENT COUNTIES...
At 741 PM EDT, a severe thunderstorm was located near Milford, or 12
miles south of Dover, moving east 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...
Milford, Harrington, Lewes, Milton, Ellendale, Bowers, Viola,
Henlopen Acres, Cape Henlopen State Park, Big Stone Beach,
Andrewsville, Felton, Greenwood, Frederica, Houston, Dewey Beach,
Magnolia, Farmington and Riverview.
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 3881 7572 3887 7571 3901 7564 3910 7545
3902 7508 3864 7505
TIME...MOT...LOC 2341Z 272DEG 39KT 3898 7544
HAIL...<.75IN
WIND...60MPH
$$
NC351
WWUS51 KPHI 272357
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
757 PM EDT Thu Aug 27 2020
DEC001-005-280007-
/O.EXP.KPHI.SV.W.0263.000000T0000Z-200828T0000Z/
Sussex DE-Kent DE-
757 PM EDT Thu Aug 27 2020
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN SUSSEX AND SOUTHERN
KENT COUNTIES WILL EXPIRE AT 800 PM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with this thunderstorm.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 3881 7572 3887 7571 3901 7564 3910 7545
3902 7508 3864 7505
TIME...MOT...LOC 2357Z 272DEG 39KT 3897 7525
$$
NCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 6:25 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's, Talbot | 50 min |
| Aug 27, 7:12 PM EDT | Special Weather Statement | PHI | Caroline | 48 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 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.