Alert archive / Delaware / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

May 4, 2021Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at May 4, 2021, 7:43 PM EDT for Sussex County, Delaware. It was in force for 47 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
May 4, 2021, 7:43 PM EDT (23:43 UTC)
Expired
May 4, 2021, 8:30 PM EDT
In force
47 min
Issued by
NWS Philadelphia/Mount Holly

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 40 km from the middle of the area, began a volume at 23:46 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, 11.7 hours before the alert went out and 68 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-pSkew-T log-p diagram, Wallops Is Stn, VA at 12:00Z on 2021-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 60 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 2021-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
60 J/kg
Mixed-layer CIN
-270 J/kg
Mixed-layer LCL
1140 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
46 m²/s²
0-3 km storm-relative helicity
96 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

886 
WWUS81 KPHI 042343
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
743 PM EDT Tue May 4 2021

DEZ003-004-050030-
Inland Sussex-Delaware Beaches-
743 PM EDT Tue May 4 2021

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

At 743 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Millsboro to near Gumboro. Movement
was east at 50 mph.

Wind gusts up to 50 mph and pea size hail are possible with these
storms.

Locations impacted include...
Millsboro, Selbyville, Dagsboro, Millville, Henlopen Acres, Gumboro,
Long Neck, Ocean View, Frankford, South Bethany and Dewey Beach.

If outdoors, consider seeking shelter inside a building.

LAT...LON 3845 7541 3862 7539 3877 7506 3845 7503
      3846 7505 3845 7505
TIME...MOT...LOC 2343Z 293DEG 43KT 3860 7537 3844 7540 

$$

JEO

The office that day

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

IssuedProductOfficeCountiesLasted
May 4, 7:54 PM EDTSpecial Marine WarningPHI51 min
May 4, 7:04 PM EDTSevere Thunderstorm WarningPHIKent, Sussex41 min
May 4, 7:38 PM EDTSevere Thunderstorm WarningPHIKent, Sussex31 min
May 4, 5:54 PM EDTSevere Thunderstorm WarningPHIQueen Anne's, Talbot51 min
May 4, 6:50 PM EDTSpecial Weather StatementPHITalbot40 min

Nearby

Special Weather Statements in Delaware, 2021Every special weather statement in 2021

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.