Alert archive / Delaware / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 44, NWS Philadelphia/Mount Holly

May 3, 2020Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 3, 2020, 11:55 PM EDT for Sussex County, Delaware. It was in force for 20 min. 2 reports 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: May 3, 2020, 11:55 PM EDT (03:55 UTC)
Expired: May 4, 2020, 12:15 AM EDT
In force: 20 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 37 km from the middle of the area, began a volume at 03:56 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
May 4, 12:05 AM EDT	TSTM WND DMG	3 S Indian Beach, DE	POWER LINES DOWN NEAR CONQUEST ROAD. TIME ESTIMATED FROM RADAR.
May 4, 12:10 AM EDT	MARINE TSTM WIND 48	4 S Indian Beach, DE	DEOS GAUGE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 3.9 hours before the alert went out and 78 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: 11 J/kg
Mixed-layer CIN: -185 J/kg
Mixed-layer LCL: 1618 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 200 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

599 
WUUS51 KPHI 040355
SVRPHI
DEC005-040415-
/O.NEW.KPHI.SV.W.0044.200504T0355Z-200504T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1155 PM EDT Sun May 3 2020

The National Weather Service in Mount Holly NJ has issued a

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

* Until 1215 AM EDT.

* At 1155 PM EDT, severe thunderstorms were located along a line
  extending from Cape Henlopen State Park to near Henlopen Acres to
  Millsboro, 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...
  Millsboro, Lewes, Dagsboro, Millville, Henlopen Acres, Cape
  Henlopen State Park, Long Neck, Ocean View, Frankford, South
  Bethany and Dewey Beach.

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.

&&

LAT...LON 3856 7540 3867 7522 3884 7512 3878 7498
      3876 7501 3861 7499 3845 7503 3846 7505
      3845 7505 3845 7520
TIME...MOT...LOC 0355Z 287DEG 32KT 3878 7509 3866 7515 3858 7530 

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

Robertson

1 follow-up statement

021 
WWUS51 KPHI 040413
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1213 AM EDT Mon May 4 2020

DEC005-040422-
/O.EXP.KPHI.SV.W.0044.000000T0000Z-200504T0415Z/
Sussex DE-
1213 AM EDT Mon May 4 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SUSSEX COUNTY
WILL EXPIRE AT 1215 AM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire. However gusty 
winds and heavy rain are still possible with additional 
thunderstorms.

LAT...LON 3856 7540 3867 7522 3884 7512 3878 7498
      3876 7501 3861 7499 3845 7503 3846 7505
      3845 7505 3845 7520
TIME...MOT...LOC 0412Z 287DEG 32KT 3874 7493 3862 7499 3854 7514 

$$

Robertson

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 11:16 PM EDT	Special Weather Statement	PHI	Sussex	44 min
May 4, 12:12 AM EDT	Areal Flood Advisory	PHI	Sussex	4 hr
May 4, 1:15 AM EDT	Special Weather Statement	PHI	Sussex	15 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.