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 Jun 21, 2017, 9:46 PM EDT for Sussex County, Delaware. It was in force for 29 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
- Jun 21, 2017, 9:46 PM EDT (01:46 UTC)
- Expired
- Jun 21, 2017, 10:15 PM EDT
- In force
- 29 min
- Issued by
- NWS Philadelphia/Mount Holly
County Sussex County, DE
The radar
The Dover AFB radar (KDOX), 37 km from the middle of the area, began a volume at 01:48 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 75 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
- 239 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 1243 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 79 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.1
The text
As transmitted.
091
WWUS81 KPHI 220146
SPSPHI
Special Weather Statement
National Weather Service Mount Holly NJ
946 PM EDT WED JUN 21 2017
DEZ003-004-220215-
Inland Sussex-Delaware Beaches-
946 PM EDT WED JUN 21 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN SUSSEX
COUNTY...
At 946 PM EDT, radar indicated strong thunderstorms were located
along a line extending from Dagsboro to near Millville. Movement was
southeast at 25 mph.
Winds up to 45 mph and pea size hail are possible with these storms.
These storms will be near...
Millville around 950 PM EDT.
Selbyville around 1000 PM EDT.
Other locations impacted by these storms include Long Neck, Ocean
View, South Bethany and Frankford.
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 3859 7533 3863 7510 3859 7518 3859 7521
3858 7518 3857 7518 3859 7514 3858 7507
3860 7507 3860 7510 3863 7506 3845 7505
3845 7526
TIME...MOT...LOC 0146Z 321DEG 18KT 3855 7523 3858 7504
$$
JRKThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 8:18 PM EDT | Special Weather Statement | PHI | Cape May | 27 min |
| Jun 21, 8:22 PM EDT | Special Marine Warning | PHI | 83 min | |
| Jun 21, 9:06 PM EDT | Special Marine Warning | PHI | 84 min | |
| Jun 22, 3:31 AM EDT | Coastal Flood Advisory | PHI | Atlantic, Burlington, Cape May, Middlesex, Monmouth, Ocean | 17 hr |
| Jun 22, 3:55 PM EDT | Small Craft Advisory | PHI | 60 hr | |
| Jun 21, 8:51 PM EDT | Special Weather Statement | PHI | Sussex | 24 min |
| Jun 21, 9:15 PM EDT | Special Weather Statement | PHI | Sussex | 30 min |
| Jun 21, 10:32 PM EDT | Special Weather Statement | PHI | Sussex | 58 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.