Alert archive / Delaware / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 11, NWS Philadelphia/Mount Holly

March 31, 2025Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Mar 31, 2025, 10:22 PM EDT for Sussex County, Delaware. It was in force for 38 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: Mar 31, 2025, 10:22 PM EDT (02:22 UTC)
Expired: Mar 31, 2025, 11:00 PM EDT
In force: 38 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 15 km from the middle of the area, began a volume at 02:25 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 00:00Z, 2.4 hours before the alert went out and 85 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 362 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 709 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 152 m²/s²
0-3 km storm-relative helicity: 185 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

347 
WUUS51 KPHI 010222
SVRPHI
DEC005-010300-
/O.NEW.KPHI.SV.W.0011.250401T0222Z-250401T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1022 PM EDT Mon Mar 31 2025

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Sussex County in southern Delaware...

* Until 1100 PM EDT.

* At 1022 PM EDT, severe thunderstorms were located along a line
  extending from near Milford to 6 miles southeast of Fruitland,
  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...
  Dagsboro, Gumboro, Laurel, Long Neck, South Bethany, Ellendale,
  Frankford, Cape Henlopen State Park, Henlopen Acres, Dewey Beach,
  Lewes, Ocean View, Sycamore, Selbyville, Millville, Milton,
  Georgetown, Millsboro, Milford, and Delmar.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3846 7563 3885 7555 3889 7550 3906 7499
      3845 7499
TIME...MOT...LOC 0222Z 259DEG 41KT 3887 7547 3826 7554 

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

$$

RCM

2 follow-up statements

826 
WWUS51 KPHI 010241
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1041 PM EDT Mon Mar 31 2025

DEC005-010300-
/O.CON.KPHI.SV.W.0011.000000T0000Z-250401T0300Z/
Sussex DE-
1041 PM EDT Mon Mar 31 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT
FOR EASTERN SUSSEX COUNTY...

At 1041 PM EDT, severe thunderstorms were located along a line
extending from 7 miles north of Lewes to Millsboro, moving east at 40
mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Dagsboro, Gumboro, Long Neck, South Bethany, Frankford, Cape Henlopen
State Park, Henlopen Acres, Dewey Beach, Lewes, Ocean View,
Selbyville, Millville, Milton, Georgetown, and Millsboro.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3845 7539 3884 7541 3893 7529 3881 7514
      3881 7507 3845 7503 3846 7505 3845 7505
TIME...MOT...LOC 0241Z 255DEG 36KT 3888 7519 3859 7531 

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

$$

Staarmann

397 
WWUS51 KPHI 010253
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1053 PM EDT Mon Mar 31 2025

DEC005-010302-
/O.EXP.KPHI.SV.W.0011.000000T0000Z-250401T0300Z/
Sussex DE-
1053 PM EDT Mon Mar 31 2025

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN SUSSEX COUNTY WILL
EXPIRE AT 1100 PM EDT...

The storms which prompted the warning have weakened below severe 
limits, and will be moving offshore through 1115 PM EDT. Therefore, 
the warning will be allowed to expire. However heavy rain is still 
possible with these thunderstorms.

LAT...LON 3845 7539 3884 7541 3893 7529 3881 7514
      3881 7507 3845 7503 3846 7505 3845 7505
TIME...MOT...LOC 0252Z 270DEG 41KT 3889 7512 3860 7524 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 31, 8:56 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle, Sussex	49 min
Mar 31, 9:13 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	47 min
Mar 31, 9:48 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	42 min
Mar 31, 10:03 PM EDT	Tornado Warning	PHI	Sussex	27 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2025 Every severe thunderstorm warning in 2025

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.