Alert archive / Delaware / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 14, NWS Philadelphia/Mount Holly

April 7, 2020Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 7, 2020, 11:48 PM EDT for Sussex County, Delaware. It was in force for 27 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 7, 2020, 11:48 PM EDT (03:48 UTC)
Expired: Apr 8, 2020, 12:15 AM EDT
In force: 27 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 18 km from the middle of the area, began a volume at 03:51 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, 3.8 hours before the alert went out and 82 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1245 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

009 
WUUS51 KPHI 080348
SVRPHI
DEC005-080415-
/O.NEW.KPHI.SV.W.0014.200408T0348Z-200408T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1148 PM EDT Tue Apr 7 2020

The National Weather Service in Mount Holly NJ has issued a

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

* Until 1215 AM EDT.

* At 1147 PM EDT, a severe thunderstorm was located near Bridgeville,
  or 13 miles northeast of Hurlock, moving east at 45 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible.

* Locations impacted include...
  Georgetown, Seaford, Millsboro, Lewes, Milton, Bridgeville,
  Dagsboro, Henlopen Acres, Sycamore, Long Neck, Blades and
  Frankford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3863 7571 3881 7572 3876 7508 3849 7514
TIME...MOT...LOC 0347Z 280DEG 40KT 3871 7565 

HAIL...1.00IN
WIND...<50MPH
 
$$

NC

1 follow-up statement

412 
WWUS51 KPHI 080408
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1208 AM EDT Wed Apr 8 2020

DEC005-080415-
/O.EXP.KPHI.SV.W.0014.000000T0000Z-200408T0415Z/
Sussex DE-
1208 AM EDT Wed Apr 8 2020

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SUSSEX COUNTY WILL
EXPIRE AT 1215 AM 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 small hail
is 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 3863 7571 3881 7572 3876 7508 3849 7514
TIME...MOT...LOC 0405Z 280DEG 40KT 3868 7545 

$$

NC

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 7, 9:30 PM EDT	Coastal Flood Advisory	PHI	Kent, New Castle, Sussex	33 hr
Apr 7, 11:10 PM EDT	Special Weather Statement	PHI	Sussex	35 min
Apr 8, 12:53 AM EDT	Special Weather Statement	PHI	Kent	52 min
Apr 8, 1:06 AM EDT	Special Weather Statement	PHI	New Castle	39 min
Apr 8, 4:21 AM EDT	Special Weather Statement	PHI	Kent, New Castle	39 min
Apr 8, 4:56 AM EDT	Special Weather Statement	PHI	Kent, Sussex	64 min
Apr 8, 7:19 PM EDT	Wind Advisory	PHI	Kent, New Castle, Sussex	24 hr

Nearby

Severe Thunderstorm Warnings in Delaware, 2020 Every severe thunderstorm warning in 2020

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.