Alert archive / Delaware / Special Weather Statements in 2019

Special Weather Statement, NWS Philadelphia/Mount Holly

July 31, 2019Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 31, 2019, 8:39 PM EDT for Sussex County, Delaware. It was in force for 36 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 31, 2019, 8:39 PM EDT (00:39 UTC)
Expired: Jul 31, 2019, 9:15 PM EDT
In force: 36 min
Issued by: NWS Philadelphia/Mount Holly

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 36 km from the middle of the area, began a volume at 00:41 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, 0.7 hours before the alert went out and 84 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: 36 J/kg
Mixed-layer CIN: -216 J/kg
Mixed-layer LCL: 1034 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.5

Open this sounding in Storm Lab

The text

As transmitted.

222 
WWUS81 KPHI 010039
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
839 PM EDT Wed Jul 31 2019

DEZ004-010115-
Delaware Beaches-
839 PM EDT Wed Jul 31 2019

...A STRONG THUNDERSTORM WILL AFFECT DELAWARE BEACHES...

At 839 PM EDT, a strong thunderstorm was located near Millville, or
17 miles east of Georgetown, moving east at 15 mph.

Wind gusts up to 40 mph and pea size hail are possible with this
storm.

Locations impacted include...
Dewey Beach.

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.

LAT...LON 3859 7512 3861 7510 3862 7512 3863 7513
      3862 7508 3866 7508 3868 7510 3869 7513
      3870 7513 3870 7511 3867 7508 3870 7508
      3870 7507 3866 7506 3858 7506 3860 7510
      3857 7509
TIME...MOT...LOC 0039Z 248DEG 14KT 3862 7508 

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 8:38 PM EDT	Special Marine Warning	PHI		67 min
Jul 31, 9:26 PM EDT	Special Marine Warning	PHI		49 min
Jul 31, 9:33 PM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland	42 min
Aug 1, 2:46 PM EDT	Areal Flood Advisory	PHI	Cumberland	66 min
Aug 1, 3:02 PM EDT	Coastal Flood Advisory	PHI	Burlington, Camden, Cape May, Cumberland, Gloucester, Mercer and 1 more	12 hr
Aug 1, 3:04 PM EDT	Special Weather Statement	PHI	Salem	26 min
Aug 1, 3:43 PM EDT	Special Marine Warning	PHI		62 min
Aug 1, 3:48 PM EDT	Special Weather Statement	PHI	Salem	42 min
Aug 1, 2:01 PM EDT	Special Weather Statement	PHI	Berks	29 min
Aug 1, 2:28 PM EDT	Special Weather Statement	PHI	Chester	47 min
Aug 1, 3:24 PM EDT	Severe Thunderstorm Warning	PHI	Chester	66 min
Jul 31, 8:48 PM EDT	Special Weather Statement	PHI	Sussex	27 min
Jul 31, 9:18 PM EDT	Special Weather Statement	PHI	Sussex	27 min
Aug 1, 2:43 PM EDT	Special Weather Statement	PHI	Kent	47 min
Aug 1, 3:39 PM EDT	Special Weather Statement	PHI	Kent	51 min
Aug 1, 3:51 PM EDT	Special Weather Statement	PHI	Kent	39 min
Aug 1, 4:00 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	60 min
Aug 1, 4:06 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	54 min
Aug 1, 4:11 PM EDT	Special Weather Statement	PHI	New Castle	34 min
Aug 1, 4:41 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	21 min
Aug 1, 4:56 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	50 min
Aug 1, 5:28 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	47 min
Aug 1, 6:16 PM EDT	Special Weather Statement	PHI	Sussex	14 min
Jul 31, 8:00 PM EDT	Special Weather Statement	PHI	Kent	30 min
Jul 31, 8:13 PM EDT	Special Weather Statement	PHI	Queen Anne's	32 min
Jul 31, 8:47 PM EDT	Special Weather Statement	PHI	Caroline	28 min
Aug 1, 4:02 PM EDT	Severe Thunderstorm Warning	PHI	Cecil	45 min

Nearby

Special Weather Statements in Delaware, 2019 Every 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.