Alert archive / Delaware / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 320, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 20, 2026, 6:57 PM EDT for Kent County, Sussex County, Delaware; Caroline County, Talbot County, Maryland. It was in force for 48 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 20, 2026, 6:57 PM EDT (22:57 UTC)
- Expired
- Aug 20, 2026, 7:45 PM EDT
- In force
- 48 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, Talbot County, MD
The radar
The Dover AFB radar (KDOX), 33 km from the middle of the area, began a volume at 22:59 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 |
|---|---|---|---|
| Aug 20, 2:31 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 20, 2:58 PM EDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.0 hours before the alert went out and 146 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
- 97 J/kg
- Mixed-layer CIN
- -72 J/kg
- Mixed-layer LCL
- 1192 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 115 m²/s²
- 0-3 km storm-relative helicity
- 230 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.0
The text
As transmitted.
842
WUUS51 KPHI 202257
SVRPHI
DEC001-005-MDC011-041-202345-
/O.NEW.KPHI.SV.W.0320.260820T2257Z-260820T2345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
657 PM EDT Thu Aug 20 2026
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Sussex County in southern Delaware...
Southwestern Kent County in central Delaware...
Southeastern Talbot County in eastern Maryland...
Caroline County in eastern Maryland...
* Until 745 PM EDT.
* At 656 PM EDT, a severe thunderstorm was located over Preston, or
near Hurlock, moving east at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Georgetown, Milford, Seaford, Denton, Millsboro, Laurel,
Harrington, Lewes, Federalsburg, Milton, Bridgeville, Delmar,
Preston, Ellendale, and Gumboro.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 1000 PM EDT for central and
southern Delaware...and eastern Maryland.
For your protection move to an interior room on the lowest floor of a
building.
A Tornado Watch remains in effect until 1000 PM EDT for central and
southern Delaware...and eastern Maryland.
&&
LAT...LON 3846 7569 3863 7571 3869 7576 3868 7580
3870 7580 3871 7584 3869 7588 3870 7590
3868 7592 3868 7594 3859 7600 3857 7602
3858 7605 3895 7586 3893 7526 3882 7518
3845 7530
TIME...MOT...LOC 2256Z 278DEG 32KT 3870 7591
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DeSilva2 follow-up statements
908
WWUS51 KPHI 202317
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
717 PM EDT Thu Aug 20 2026
DEC001-MDC041-202326-
/O.CAN.KPHI.SV.W.0320.000000T0000Z-260820T2345Z/
Kent DE-Talbot MD-
717 PM EDT Thu Aug 20 2026
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN KENT AND
SOUTHEASTERN TALBOT COUNTIES IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 1000 PM EDT for central and
southern Delaware...and eastern Maryland.
LAT...LON 3846 7569 3863 7571 3869 7576 3868 7580
3870 7580 3871 7584 3869 7588 3870 7590
3868 7592 3868 7594 3878 7584 3883 7567
3884 7556 3885 7555 3882 7518 3845 7530
TIME...MOT...LOC 2316Z 272DEG 32KT 3867 7568
$$
DEC005-MDC011-202345-
/O.CON.KPHI.SV.W.0320.000000T0000Z-260820T2345Z/
Sussex DE-Caroline MD-
717 PM EDT Thu Aug 20 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR SUSSEX AND SOUTHEASTERN CAROLINE COUNTIES...
At 716 PM EDT, a severe thunderstorm was located near Seaford, or 10
miles east of Hurlock, moving east at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Georgetown, Seaford, Millsboro, Laurel, Lewes, Federalsburg, Milton,
Bridgeville, Delmar, Preston, Ellendale, Gumboro, Smithville, Agner,
and Sycamore.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 1000 PM EDT for central and
southern Delaware...and eastern Maryland.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3846 7569 3863 7571 3869 7576 3868 7580
3870 7580 3871 7584 3869 7588 3870 7590
3868 7592 3868 7594 3878 7584 3883 7567
3884 7556 3885 7555 3882 7518 3845 7530
TIME...MOT...LOC 2316Z 272DEG 32KT 3867 7568
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DeSilva069
WWUS51 KPHI 202340
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
740 PM EDT Thu Aug 20 2026
DEC005-MDC011-202350-
/O.EXP.KPHI.SV.W.0320.000000T0000Z-260820T2345Z/
Sussex DE-Caroline MD-
740 PM EDT Thu Aug 20 2026
...THE SEVERE THUNDERSTORM WARNING FOR SUSSEX AND SOUTHEASTERN
CAROLINE COUNTIES WILL EXPIRE AT 745 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
A Tornado Watch remains in effect until 1000 PM EDT for central and
southern Delaware...and eastern Maryland.
LAT...LON 3846 7569 3863 7571 3869 7576 3868 7580
3870 7580 3871 7584 3869 7588 3870 7590
3868 7592 3868 7594 3878 7584 3883 7567
3884 7556 3885 7555 3882 7518 3845 7530
TIME...MOT...LOC 2340Z 278DEG 32KT 3864 7541
$$
DeSilvaThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 4:16 PM EDT | Tornado Warning | PHI | Kent | 29 min |
| Aug 20, 4:50 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 40 min |
| Aug 20, 5:27 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 48 min |
| Aug 20, 5:39 PM EDT | Flash Flood Warning | PHI | New Castle | 4 hr |
| Aug 20, 5:39 PM EDT | Tornado Warning | PHI | Kent | 36 min |
| Aug 20, 5:40 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 50 min |
| Aug 20, 6:03 PM EDT | Tornado Warning | PHI | Kent | 42 min |
| Aug 20, 6:09 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 51 min |
| Aug 20, 6:13 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 47 min |
| Aug 20, 6:21 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 39 min |
| Aug 20, 6:53 PM EDT | Flash Flood Warning | PHI | Kent | 105 min |
| Aug 20, 2:43 PM EDT | Tornado Warning | PHI | Kent, Queen Anne's | 32 min |
| Aug 20, 5:05 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 40 min |
| Aug 20, 5:30 PM EDT | Tornado Warning | PHI | Kent, Queen Anne's | 30 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2026Severe Thunderstorm Warnings in Maryland, 2026Every severe thunderstorm warning in 2026
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.