Alert archive / Delaware / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 20, NWS Philadelphia/Mount Holly

April 1, 2023Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 1, 2023, 8:28 PM EDT for Sussex County, Delaware. It was in force for 47 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: Apr 1, 2023, 8:28 PM EDT (00:28 UTC)
Expired: Apr 1, 2023, 9:15 PM EDT
In force: 47 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 32 km from the middle of the area, began a volume at 00:29 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
Apr 1, 5:30 PM EDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 0.5 hours before the alert went out and 70 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: 638 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 1435 m above ground
0-6 km bulk shear: 81 kt
0-1 km storm-relative helicity: 509 m²/s²
0-3 km storm-relative helicity: 502 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 7.2

Open this sounding in Storm Lab

The text

As transmitted.

667 
WUUS51 KPHI 020028
SVRPHI
DEC005-020115-
/O.NEW.KPHI.SV.W.0020.230402T0028Z-230402T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
828 PM EDT Sat Apr 1 2023

The National Weather Service in Mount Holly NJ has issued a

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

* Until 915 PM EDT.

* At 827 PM EDT, severe thunderstorms were located along a line
  extending from Lewes to 6 miles southeast of Milton to near Laurel,
  moving southeast at 60 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Georgetown, Seaford, Millsboro, Laurel, Lewes, Milton, Selbyville,
  Bridgeville, Delmar, Dagsboro, Millville, Ellendale, Henlopen
  Acres, Gumboro, Cape Henlopen State Park, Sycamore, Long Neck,
  Ocean View, Blades and Frankford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM EDT for southern
Delaware...and eastern Maryland.

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 these storms. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

A Tornado Watch remains in effect until 1000 PM EDT for southern
Delaware...and eastern Maryland.

&&

LAT...LON 3846 7564 3849 7570 3865 7571 3879 7566
      3884 7511 3875 7486 3845 7483 3845 7503
      3846 7505 3845 7505 3845 7537
TIME...MOT...LOC 0027Z 298DEG 54KT 3877 7512 3869 7526 3854 7563 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MLB

3 follow-up statements

445 
WWUS51 KPHI 020042
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
842 PM EDT Sat Apr 1 2023

DEC005-020115-
/O.CON.KPHI.SV.W.0020.000000T0000Z-230402T0115Z/
Sussex DE-
842 PM EDT Sat Apr 1 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR SUSSEX COUNTY...

At 841 PM EDT, severe thunderstorms were located along a line
extending from 10 miles east of Henlopen Acres to near Millville to
near Gumboro, moving southeast at 60 mph.

HAZARD...60 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

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

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM EDT for southern
Delaware.

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

&&

LAT...LON 3846 7564 3881 7544 3884 7511 3875 7486
      3845 7483
TIME...MOT...LOC 0041Z 298DEG 54KT 3868 7491 3860 7505 3845 7542 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MLB

570 
WWUS51 KPHI 020056
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
856 PM EDT Sat Apr 1 2023

DEC005-020115-
/O.CON.KPHI.SV.W.0020.000000T0000Z-230402T0115Z/
Sussex DE-
856 PM EDT Sat Apr 1 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR SOUTHEASTERN SUSSEX COUNTY...

At 855 PM EDT, severe thunderstorms were located along a line
extending from 24 miles southeast of Henlopen Acres to 16 miles east
of Millville to near Berlin, moving southeast at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM EDT for southern
Delaware.

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

&&

LAT...LON 3846 7545 3884 7519 3884 7512 3873 7485
      3845 7484
TIME...MOT...LOC 0055Z 297DEG 61KT 3858 7468 3850 7482 3835 7519 

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

$$

MLB

113 
WWUS51 KPHI 020106
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
906 PM EDT Sat Apr 1 2023

DEC005-020115-
/O.EXP.KPHI.SV.W.0020.000000T0000Z-230402T0115Z/
Sussex DE-
906 PM EDT Sat Apr 1 2023

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SUSSEX COUNTY
WILL EXPIRE AT 915 PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.

A Tornado Watch remains in effect until 1000 PM EDT for southern
Delaware.

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 3846 7545 3884 7519 3884 7512 3873 7485
      3845 7484
TIME...MOT...LOC 0105Z 298DEG 54KT 3851 7452 3843 7466 3828 7503 

$$

MLB

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 2, 11:40 AM EDT	Frost Advisory	PHI	Kent, New Castle, Sussex	21 hr

Nearby

Severe Thunderstorm Warnings in Delaware, 2023 Every severe thunderstorm warning in 2023

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.