Alert archive / Maryland / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 301, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 10, 2026, 6:07 PM EDT for Kent County, New Castle County, Sussex County, Delaware; 4 counties in Maryland. It was in force for 38 min. 6 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
- Aug 10, 2026, 6:07 PM EDT (22:07 UTC)
- Expired
- Aug 10, 2026, 6:45 PM EDT
- In force
- 38 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD
The radar
The Dover AFB radar (KDOX), 26 km from the middle of the area, began a volume at 22:08 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 |
|---|---|---|---|
| Aug 10, 6:08 PM EDT | TSTM WND DMG | Camden, DE | Tree and wires down. Time estimated from radar. |
| Aug 10, 6:13 PM EDT | TSTM WND GST 58 | 1 Ne Magnolia, DE | Mesonet station DEL17 Sr1 At Trap Shooters Rd. |
| Aug 10, 6:15 PM EDT | MARINE TSTM WIND 39 | 20 E Chesapeake Beach, MD | A thunderstorm produced an estimated wind gust to 34 knots (39 MPH) near the Cooperative Oxford Laboratory NOS sensor (CXLM2). |
| Aug 10, 6:20 PM EDT | TSTM WND DMG | 2 S American Corner, MD | Multiple trees down. Time estimated from radar. |
| Aug 10, 6:20 PM EDT | MARINE TSTM WIND 41 | 1 N Dover Air Force Bas, DE | |
| Aug 10, 6:37 PM EDT | TSTM WND DMG | Bridgeville, DE | Wires down. 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 |
|---|---|---|---|
| Aug 10, 2:10 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 10.1 hours before the alert went out and 144 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
- 682 J/kg
- Mixed-layer CIN
- -91 J/kg
- Mixed-layer LCL
- 1254 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- -34 m²/s²
- 0-3 km storm-relative helicity
- -2 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.6
The text
As transmitted.
574
WUUS51 KPHI 102207
SVRPHI
DEC001-003-005-MDC011-029-035-041-102245-
/O.NEW.KPHI.SV.W.0301.260810T2207Z-260810T2245Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
607 PM EDT Mon Aug 10 2026
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northern Sussex County in southern Delaware...
Southwestern New Castle County in northern Delaware...
Kent County in central Delaware...
Southern Talbot County in eastern Maryland...
Eastern Queen Anne's County in northeastern Maryland...
Caroline County in eastern Maryland...
Eastern Kent County in northeastern Maryland...
* Until 645 PM EDT.
* At 607 PM EDT, severe thunderstorms were located along a line
extending from near Sassafras to near Greensboro to 7 miles south
of Tilghman Island, moving southeast at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Dover, Easton, Georgetown, Smyrna, Milford, Seaford, Denton,
Harrington, Camden, Clayton, Federalsburg, Milton, Bridgeville,
Cheswold, Trappe, Preston, Oxford, Ellendale, Bowers, and Woodside.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Mount Holly NJ.
&&
LAT...LON 3871 7627 3872 7627 3872 7630 3895 7577
3944 7577 3926 7536 3920 7516 3917 7516
3920 7518 3918 7536 3907 7536 3889 7520
3874 7522 3854 7570 3865 7571 3871 7584
3868 7593 3857 7603 3871 7622 3868 7635
TIME...MOT...LOC 2207Z 292DEG 29KT 3937 7573 3894 7572 3864 7635
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS1 follow-up statement
400
WWUS51 KPHI 102236
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
636 PM EDT Mon Aug 10 2026
DEC001-003-005-MDC011-029-035-041-102246-
/O.EXP.KPHI.SV.W.0301.000000T0000Z-260810T2245Z/
Sussex DE-New Castle DE-Kent DE-Talbot MD-Queen Anne's MD-
Caroline MD-Kent MD-
636 PM EDT Mon Aug 10 2026
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN SUSSEX...SOUTHWESTERN
NEW CASTLE...KENT...SOUTHERN TALBOT...EASTERN QUEEN ANNE'S...CAROLINE
AND EASTERN KENT COUNTIES WILL EXPIRE AT 645 PM EDT...
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire. However gusty
winds and heavy rain are still possible with these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
central, northern and southern Delaware...eastern and northeastern
Maryland...and southern New Jersey.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 3871 7627 3872 7627 3872 7630 3895 7577
3944 7577 3926 7536 3920 7516 3917 7516
3920 7518 3918 7536 3907 7536 3889 7520
3874 7522 3854 7570 3865 7571 3871 7584
3868 7593 3857 7603 3871 7622 3868 7635
TIME...MOT...LOC 2236Z 292DEG 29KT 3929 7549 3886 7548 3857 7611
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 4:39 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 66 min |
| Aug 10, 4:46 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 20 min |
| Aug 10, 5:36 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle, Sussex | 39 min |
| Aug 10, 6:22 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 23 min |
| Aug 10, 7:04 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 41 min |
Nearby
Severe Thunderstorm Warnings in Maryland, 2026Severe Thunderstorm Warnings in Delaware, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.