Alert archive / Delaware / Special Weather Statements in 2020

Special Weather Statement, NWS Philadelphia/Mount Holly

July 6, 2020Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 6, 2020, 9:49 PM EDT for Sussex County, Delaware. It was in force for 56 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 6, 2020, 9:49 PM EDT (01:49 UTC)
Expired: Jul 6, 2020, 10:45 PM EDT
In force: 56 min
Issued by: NWS Philadelphia/Mount Holly

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 28 km from the middle of the area, began a volume at 01:51 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, 1.8 hours before the alert went out and 73 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: 1831 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 1086 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.1

Open this sounding in Storm Lab

The text

As transmitted.

140 
WWUS81 KPHI 070149
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
949 PM EDT Mon Jul 6 2020

DEZ003-004-070245-
Inland Sussex-Delaware Beaches-
949 PM EDT Mon Jul 6 2020

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SUSSEX COUNTY...

At 949 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Milton to near Delmar. Movement was
east at 15 mph.

Wind gusts up to 40 mph are possible with these storms.

Locations impacted include...
Georgetown, Seaford, Millsboro, Laurel, Lewes, Milton, Selbyville,
Delmar, Dagsboro, Millville, Ellendale, Henlopen Acres, Gumboro, Cape
Henlopen State Park, Sycamore, Long Neck, Ocean View, Blades,
Frankford and South Bethany.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

LAT...LON 3845 7539 3846 7564 3856 7566 3888 7544
      3889 7499 3856 7500 3845 7513
TIME...MOT...LOC 0149Z 261DEG 11KT 3883 7531 3847 7549 

$$

BAH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 9:19 PM EDT	Special Marine Warning	PHI		56 min
Jul 6, 8:21 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	39 min
Jul 6, 8:41 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	2 hr
Jul 6, 8:53 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	37 min
Jul 6, 9:25 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	24 min
Jul 7, 5:21 PM EDT	Areal Flood Advisory	PHI	Caroline, Talbot	55 min

Nearby

Special Weather Statements in Delaware, 2020 Every special weather statement 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.