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, 9:15 PM EDT for Sussex County, Delaware. It was in force for 30 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, 9:15 PM EDT (01:15 UTC)
- Expired
- Jun 21, 2017, 9:45 PM EDT
- In force
- 30 min
- Issued by
- NWS Philadelphia/Mount Holly
County Sussex County, DE
The radar
The Dover AFB radar (KDOX), 33 km from the middle of the area, began a volume at 01:15 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, 1.3 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
- 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.
551
WWUS81 KPHI 220115
SPSPHI
Special Weather Statement
National Weather Service Mount Holly NJ
915 PM EDT WED JUN 21 2017
DEZ003-004-220145-
Inland Sussex-Delaware Beaches-
915 PM EDT WED JUN 21 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN SUSSEX
COUNTY...
At 914 PM EDT, radar indicated strong thunderstorms were located
along a line extending from Henlopen Acres to near Georgetown.
Movement was southeast at 30 mph.
Winds up to 45 mph and pea size hail are possible with these storms.
Locations impacted include...
Georgetown, Millsboro, Lewes, Selbyville, Dagsboro, Millville,
Henlopen Acres, Gumboro, Long Neck, Ocean View, Frankford, South
Bethany and Dewey Beach.
Brief heavy downpours can be expected, which will reduce visibility
below one mile and cause ponding of water on roadways.
These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
LAT...LON 3869 7553 3879 7509 3867 7507 3869 7508
3869 7514 3864 7513 3862 7508 3866 7507
3861 7506 3859 7521 3857 7518 3858 7507
3860 7509 3860 7506 3845 7505 3845 7536
TIME...MOT...LOC 0114Z 326DEG 25KT 3873 7509 3866 7541
$$
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, 9:46 PM EDT | Special Weather Statement | PHI | Sussex | 29 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.