Alert archive / Delaware / Special Weather Statements in 2017
Special Weather Statement, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this special weather statement at Aug 18, 2017, 9:08 PM EDT for Sussex County, Delaware. It was in force for 52 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 18, 2017, 9:08 PM EDT (01:08 UTC)
- Expired
- Aug 18, 2017, 10:00 PM EDT
- In force
- 52 min
- Issued by
- NWS Philadelphia/Mount Holly
County Sussex County, DE
The radar
The Dover AFB radar (KDOX), 24 km from the middle of the area, began a volume at 01:11 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, 1.1 hours before the alert went out and 80 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.
- Mixed-layer CAPE
- 394 J/kg
- Mixed-layer CIN
- -110 J/kg
- Mixed-layer LCL
- 1406 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
517
WWUS81 KPHI 190108
SPSPHI
Special Weather Statement
National Weather Service Mount Holly NJ
908 PM EDT FRI AUG 18 2017
DEZ003-004-MDZ020-190200-
Inland Sussex-Delaware Beaches-Caroline-
908 PM EDT FRI AUG 18 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SUSSEX AND SOUTHEASTERN
CAROLINE COUNTIES...
At 908 PM EDT, radar indicated strong thunderstorms were located
along a line extending from Sharptown to near Henlopen Acres.
Movement was south at 20 mph.
Winds up to 30 mph and pea size hail are possible with these storms.
Locations impacted include...
Georgetown, Seaford, Millsboro, Laurel, Lewes, Federalsburg, Milton,
Selbyville, Bridgeville, Delmar, Dagsboro, Preston, Millville,
Ellendale, Henlopen Acres, Gumboro, Cape Henlopen State Park,
Sycamore, Long Neck and Ocean View.
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 3846 7569 3865 7571 3871 7584 3870 7594
3885 7523 3879 7516 3880 7509 3867 7507
3869 7508 3869 7514 3864 7513 3862 7508
3866 7507 3861 7506 3859 7521 3857 7518
3860 7506 3845 7505
TIME...MOT...LOC 0108Z 339DEG 17KT 3852 7572 3864 7507
$$
SFJThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 8:26 PM EDT | Special Weather Statement | PHI | Atlantic, Cape May, Ocean | 49 min |
| Aug 19, 7:55 PM EDT | Special Weather Statement | PHI | Berks | 65 min |
| Aug 18, 8:43 PM EDT | Special Weather Statement | PHI | Sussex | 32 min |
| Aug 18, 9:55 PM EDT | Special Weather Statement | PHI | Sussex | 50 min |
Nearby
Special Weather Statements in Delaware, 2017Every special weather statement in 2017
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.