Alert archive / Delaware / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 310, NWS Philadelphia/Mount Holly

August 17, 2026Kent County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 17, 2026, 7:04 PM EDT for Kent County, Delaware. It was in force for 20 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 17, 2026, 7:04 PM EDT (23:04 UTC)
Expired
Aug 17, 2026, 7:24 PM EDT
In force
20 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Kent County, DE

The radar

The Dover AFB radar (KDOX), 23 km from the middle of the area, began a volume at 23:05 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, 11.1 hours before the alert went out and 153 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.

Skew-T log-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2026-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 154 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2026-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 77 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
154 J/kg
Mixed-layer CIN
-50 J/kg
Mixed-layer LCL
877 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
77 m²/s²
0-3 km storm-relative helicity
59 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

882 
WUUS51 KPHI 172304
SVRPHI
DEC001-172345-
/O.NEW.KPHI.SV.W.0310.260817T2304Z-260817T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
Issued by National Weather Service Baltimore MD/Washington DC
704 PM EDT Mon Aug 17 2026

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southern Kent County in central Delaware...

* Until 745 PM EDT.

* At 704 PM EDT, a severe thunderstorm was located over Sandtown, or
  12 miles southwest of Dover, moving southeast at 20 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, Camden, Woodside, Viola, Hartly, Hazlettville,
  Sandtown, Andrewsville, Wyoming, Felton, Frederica, Houston,
  Marydel, Farmington, Riverview, and Woodside East.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3890 7573 3915 7575 3921 7569 3896 7539
      3894 7540 3883 7565 3883 7571
TIME...MOT...LOC 2304Z 337DEG 19KT 3907 7572 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

EST
1 follow-up statement
058 
WWUS51 KPHI 172324
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service Baltimore MD/Washington DC
724 PM EDT Mon Aug 17 2026

DEC001-172334-
/O.CAN.KPHI.SV.W.0310.000000T0000Z-260817T2345Z/
Kent DE-
724 PM EDT Mon Aug 17 2026

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN KENT COUNTY 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 gusty winds and
heavy rain 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 3890 7573 3915 7575 3921 7569 3896 7539
      3894 7540 3883 7565 3883 7571
TIME...MOT...LOC 2318Z 337DEG 19KT 3897 7567 

$$

EST

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 17, 4:43 AM EDTFlash Flood WarningPHINew Castle2 hr
Aug 17, 6:45 PM EDTSevere Thunderstorm WarningPHINew Castle32 min

Nearby

Severe 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.