Alert archive / Delaware / Special Weather Statements in 2019

Special Weather Statement, NWS Philadelphia/Mount Holly

August 4, 2019Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 4, 2019, 3:30 PM EDT for Sussex County, Delaware. It was in force for 45 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
Aug 4, 2019, 3:30 PM EDT (19:30 UTC)
Expired
Aug 4, 2019, 4:15 PM EDT
In force
45 min
Issued by
NWS Philadelphia/Mount Holly

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 42 km from the middle of the area, began a volume at 19:33 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, 7.5 hours before the alert went out and 63 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 2019-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 945 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 2019-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 square meters per square second.1939Sfc1 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
945 J/kg
Mixed-layer CIN
-27 J/kg
Mixed-layer LCL
858 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
25 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

As transmitted.

569 
WWUS81 KPHI 041930
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
330 PM EDT Sun Aug 4 2019

DEZ003-004-042015-
Inland Sussex-Delaware Beaches-
330 PM EDT Sun Aug 4 2019

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN SUSSEX COUNTY...

At 330 PM EDT, a strong thunderstorm was located near Ocean Pines, 
Maryland, moving east at 35 mph.

Wind gusts up to 35 mph and pea size hail are possible with this 
storm.

Locations that may be impacted include...
Fenwick Island, Selbyville and South Bethany. 

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

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 3850 7533 3852 7505 3845 7505 3845 7532
      3846 7532
TIME...MOT...LOC 1929Z 259DEG 29KT 3844 7515 

$$

Iovino

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 8:51 PM EDTSpecial Weather StatementPHISussex54 min
Aug 3, 9:36 PM EDTSpecial Weather StatementPHISussex54 min
Aug 4, 12:29 PM EDTSpecial Marine WarningPHI61 min
Aug 4, 1:22 PM EDTSpecial Marine WarningPHI53 min
Aug 4, 12:06 PM EDTSpecial Weather StatementPHISussex39 min
Aug 4, 12:28 PM EDTSevere Thunderstorm WarningPHISussex47 min
Aug 4, 12:51 PM EDTAreal Flood AdvisoryPHISussex51 min

Nearby

Special Weather Statements in Delaware, 2019Every special weather statement in 2019

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.