Alert archive / Delaware / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 25, NWS Philadelphia/Mount Holly

April 6, 2023Kent County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 6, 2023, 8:22 PM EDT for Kent County, Sussex County, Delaware. It was in force for 38 min. 1 report 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: Apr 6, 2023, 8:22 PM EDT (00:22 UTC)
Expired: Apr 6, 2023, 9:00 PM EDT
In force: 38 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Kent County, DE, Sussex County, DE

The radar

The Dover AFB radar (KDOX), 15 km from the middle of the area, began a volume at 00:23 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
Apr 6, 8:43 PM EDT	TSTM WND DMG	3 Nne Houston, DE	WIRES DOWN AT INTERSECTION OF BLUE JAY LANE AND CANTERBURY ROAD.

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
Apr 6, 2:58 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 0.4 hours before the alert went out and 113 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: 1124 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 939 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 145 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

943 
WUUS51 KPHI 070022
SVRPHI
DEC001-005-070100-
/O.NEW.KPHI.SV.W.0025.230407T0022Z-230407T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
822 PM EDT Thu Apr 6 2023

The National Weather Service in Mount Holly NJ has issued a

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

* Until 900 PM EDT.

* At 822 PM EDT, a severe thunderstorm was located near Harrington,
  or 13 miles south of Dover, moving east at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Dover, Milford, Harrington, Camden, Bowers, Woodside, Viola, Rising
  Sun-Lebanon, Rising Sun, Big Stone Beach, Andrewsville, Dover Base
  Housing, Wyoming, Felton, Frederica, Houston, Magnolia, Farmington,
  Riverview and Highland Acres.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In addition to 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.

&&

LAT...LON 3884 7571 3914 7562 3910 7539 3881 7518
TIME...MOT...LOC 0022Z 280DEG 28KT 3898 7561 

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

$$

Gorse

2 follow-up statements

200 
WWUS51 KPHI 070040
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
840 PM EDT Thu Apr 6 2023

DEC001-005-070100-
/O.CON.KPHI.SV.W.0025.000000T0000Z-230407T0100Z/
Sussex DE-Kent DE-
840 PM EDT Thu Apr 6 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR NORTHERN SUSSEX AND SOUTHEASTERN KENT COUNTIES...

At 840 PM EDT, a severe thunderstorm was located over Milford, or 16
miles south of Dover, moving east 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, Milford, Harrington, Camden, Bowers, Rising Sun-Lebanon,
Rising Sun, Big Stone Beach, Dover Base Housing, Frederica, Houston,
Magnolia, Farmington, Riverview, Highland Acres and Woodside East.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.

&&

LAT...LON 3883 7560 3912 7554 3910 7539 3881 7518
TIME...MOT...LOC 0040Z 280DEG 29KT 3893 7542 

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

$$

Gorse

576 
WWUS51 KPHI 070052
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
852 PM EDT Thu Apr 6 2023

DEC001-005-070101-
/O.EXP.KPHI.SV.W.0025.000000T0000Z-230407T0100Z/
Sussex DE-Kent DE-
852 PM EDT Thu Apr 6 2023

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN SUSSEX AND
SOUTHEASTERN KENT COUNTIES WILL EXPIRE AT 900 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.  However gusty
winds and heavy rain are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
central and southern Delaware.

LAT...LON 3883 7560 3912 7554 3910 7539 3881 7518
TIME...MOT...LOC 0051Z 280DEG 28KT 3892 7533 

$$

Gorse

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.