Alert archive / Delaware / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 72, NWS Philadelphia/Mount Holly

June 22, 2020Kent County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 22, 2020, 7:08 PM EDT for Kent County, Sussex County, Delaware. It was in force for 15 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: Jun 22, 2020, 7:08 PM EDT (23:08 UTC)
Expired: Jun 22, 2020, 7:23 PM EDT
In force: 15 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), 11 km from the middle of the area, began a volume at 23:11 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 12:00Z, 11.1 hours before the alert went out and 89 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: 88 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 958 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

069 
WUUS51 KPHI 222308
SVRPHI
DEC001-005-222345-
/O.NEW.KPHI.SV.W.0072.200622T2308Z-200622T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
708 PM EDT Mon Jun 22 2020

The National Weather Service in Mount Holly NJ has issued a

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

* Until 745 PM EDT.

* At 707 PM EDT, a severe thunderstorm was located near Ellendale, or
  near Georgetown, moving northeast at 20 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Georgetown, Milford, Lewes, Milton, Bridgeville, Ellendale,
  Sycamore, Greenwood and Houston.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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

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

&&

LAT...LON 3854 7544 3874 7565 3903 7541 3878 7515
TIME...MOT...LOC 2307Z 214DEG 17KT 3876 7546 

HAIL...<.75IN
WIND...60MPH
 
$$

Fitzsimmons

1 follow-up statement

659 
WWUS51 KPHI 222323
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
723 PM EDT Mon Jun 22 2020

DEC001-005-222332-
/O.CAN.KPHI.SV.W.0072.000000T0000Z-200622T2345Z/
Sussex DE-Kent DE-
723 PM EDT Mon Jun 22 2020

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SUSSEX AND
SOUTHEASTERN KENT COUNTIES IS CANCELLED...
                
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 has been cancelled.  However gusty winds are
still possible with this thunderstorm.

LAT...LON 3854 7544 3874 7565 3903 7541 3878 7515
TIME...MOT...LOC 2321Z 214DEG 17KT 3882 7541 

$$

Fitzsimmons

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 22, 7:01 PM EDT	Special Weather Statement	PHI	Sussex	44 min
Jun 22, 7:25 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	22 min

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.