Alert archive / Delaware / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 247, NWS Philadelphia/Mount Holly

July 28, 2023Kent County, Maryland; Kent County, New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 28, 2023, 10:44 PM EDT for Kent County, Maryland; Kent County, New Castle County, Delaware. It was in force for 31 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: Jul 28, 2023, 10:44 PM EDT (02:44 UTC)
Expired: Jul 28, 2023, 11:15 PM EDT
In force: 31 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, Kent County, MD

The radar

The Dover AFB radar (KDOX), 45 km from the middle of the area, began a volume at 02:44 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, 2.7 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.

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: 3118 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 1098 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 11.4

Open this sounding in Storm Lab

The text

As transmitted.

904 
WUUS51 KPHI 290244
SVRPHI
DEC001-003-MDC029-290315-
/O.NEW.KPHI.SV.W.0247.230729T0244Z-230729T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1044 PM EDT Fri Jul 28 2023

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southwestern New Castle County in northern Delaware...
  Kent County in central Delaware...
  Eastern Kent County in northeastern Maryland...

* Until 1115 PM EDT.

* At 1044 PM EDT, severe thunderstorms were located along a line
  extending from near Delaney Corner to near Hazlettville to near
  Sandtown, 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, Smyrna, Camden, Clayton, Cheswold, Bowers, Woodside, Viola,
  Rising Sun-Lebanon, Woodland Beach, Hazlettville, Delaney Corner,
  Dover Base Housing, Dover Speedway, Green Spring, Rising Sun, Big
  Stone Beach, Wyoming, Felton and Frederica.

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

&&

LAT...LON 3944 7552 3926 7533 3900 7529 3893 7563
      3915 7566 3934 7581
TIME...MOT...LOC 0244Z 249DEG 32KT 3927 7574 3917 7563 3899 7566 

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

$$

MLB

2 follow-up statements

040 
WWUS51 KPHI 290303
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1103 PM EDT Fri Jul 28 2023

MDC029-290312-
/O.CAN.KPHI.SV.W.0247.000000T0000Z-230729T0315Z/
Kent MD-
1103 PM EDT Fri Jul 28 2023

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN KENT COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 3940 7564 3944 7552 3926 7533 3900 7529
      3896 7548
TIME...MOT...LOC 0302Z 249DEG 32KT 3932 7557 3922 7546 3904 7549 

$$

DEC001-003-290315-
/O.CON.KPHI.SV.W.0247.000000T0000Z-230729T0315Z/
New Castle DE-Kent DE-
1103 PM EDT Fri Jul 28 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT
FOR SOUTH CENTRAL NEW CASTLE AND CENTRAL KENT COUNTIES...

At 1102 PM EDT, severe thunderstorms were located along a line
extending from near Smyrna to near Dover Speedway to near Viola,
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, Smyrna, Camden, Bowers, Rising Sun-Lebanon, Woodland Beach,
Rising Sun, Dover Base Housing, Big Stone Beach, Dover Speedway,
Frederica, Magnolia, Little Creek, Leipsic, Chambersville, Rodney
Village, Kent Acres, Highland Acres, Riverview and Woodside East.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3940 7564 3944 7552 3926 7533 3900 7529
      3896 7548
TIME...MOT...LOC 0302Z 249DEG 32KT 3932 7557 3922 7546 3904 7549 

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

$$

MLB

462 
WWUS51 KPHI 290311
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1111 PM EDT Fri Jul 28 2023

DEC001-003-290321-
/O.EXP.KPHI.SV.W.0247.000000T0000Z-230729T0315Z/
New Castle DE-Kent DE-
1111 PM EDT Fri Jul 28 2023

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL NEW CASTLE AND
CENTRAL KENT COUNTIES WILL EXPIRE AT 1115 PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.

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 3940 7564 3944 7552 3926 7533 3900 7529
      3896 7548
TIME...MOT...LOC 0311Z 249DEG 32KT 3935 7548 3925 7537 3907 7541 

$$

MLB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 8:18 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Queen Anne's	42 min
Jul 28, 9:30 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	45 min
Jul 28, 10:07 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's	38 min
Jul 28, 11:00 PM EDT	Severe Thunderstorm Warning	PHI	Caroline	60 min
Jul 28, 11:33 PM EDT	Severe Thunderstorm Warning	PHI	Caroline	27 min
Jul 29, 12:12 AM EDT	Severe Thunderstorm Warning	PHI	Caroline	36 min
Jul 29, 5:00 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Kent, Queen Anne's	60 min
Jul 29, 5:02 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Caroline, Kent, Queen Anne's, Talbot	73 min
Jul 29, 5:44 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Caroline, Kent, Queen Anne's	46 min
Jul 29, 6:00 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Caroline	75 min
Jul 28, 8:04 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	41 min
Jul 28, 8:33 PM EDT	Special Weather Statement	PHI	New Castle	42 min
Jul 28, 11:59 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	31 min
Jul 29, 4:55 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	50 min
Jul 29, 6:18 PM EDT	Tornado Warning	PHI	Sussex	27 min
Jul 29, 6:26 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	49 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2023 Severe Thunderstorm Warnings in Maryland, 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.