Alert archive / Delaware / Special Weather Statements in 2018

Special Weather Statement, NWS Philadelphia/Mount Holly

April 4, 2018Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Apr 4, 2018, 2:17 PM EDT for Sussex County, Delaware. It was in force for 43 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: Apr 4, 2018, 2:17 PM EDT (18:17 UTC)
Expired: Apr 4, 2018, 3:00 PM EDT
In force: 43 min
Issued by: NWS Philadelphia/Mount Holly

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 30 km from the middle of the area, began a volume at 18:19 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, 6.3 hours before the alert went out and 79 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: 117 J/kg
Mixed-layer CIN: -288 J/kg
Mixed-layer LCL: 959 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 287 m²/s²
0-3 km storm-relative helicity: 257 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

501 
WWUS81 KPHI 041817
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
217 PM EDT WED APR 4 2018

DEZ003-004-041900-
Inland Sussex-Delaware Beaches-
217 PM EDT WED APR 4 2018

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SUSSEX COUNTY...

At 216 PM EDT, radar indicated strong thunderstorms were located
along a line extending from Scotch Bonnet to near Hebron. Movement
was east at 45 mph.

Winds up to 50 mph are possible with these storms.

Locations impacted include...
Georgetown, Millsboro, Laurel, Lewes, Milton, Selbyville, Delmar,
Dagsboro, Millville, Henlopen Acres, Gumboro, Cape Henlopen State
Park, Sycamore, Long Neck, Ocean View, Frankford, South Bethany,
Dewey Beach and Bethel.

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 3846 7569 3855 7570 3886 7525 3879 7516
      3880 7509 3867 7507 3869 7508 3869 7514
      3864 7513 3862 7508 3866 7507 3861 7506
      3859 7521 3857 7518 3858 7507 3860 7506
      3845 7505
TIME...MOT...LOC 1816Z 277DEG 42KT 3906 7480 3847 7573 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 3, 9:42 PM EDT	Marine Dense Fog Advisory	PHI		14 hr
Apr 4, 12:01 AM EDT	Dense Fog Advisory	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 7 more	10 hr
Apr 4, 2:56 AM EDT	Special Weather Statement	PHI	Sussex	34 min
Apr 4, 3:44 AM EDT	High Wind Warning	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Morris and 3 more	16 hr
Apr 4, 12:29 PM EDT	Special Weather Statement	PHI	Camden	31 min
Apr 4, 12:39 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 2 more	51 min
Apr 4, 12:54 PM EDT	Special Marine Warning	PHI		96 min
Apr 4, 1:07 PM EDT	Special Marine Warning	PHI		113 min
Apr 4, 1:13 PM EDT	Special Weather Statement	PHI	Atlantic, Cape May, Cumberland	62 min
Apr 4, 1:26 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Middlesex, Monmouth, Ocean	49 min
Apr 4, 1:46 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Cumberland	4 hr
Apr 4, 1:46 PM EDT	Special Marine Warning	PHI		59 min
Apr 4, 2:15 PM EDT	Special Weather Statement	PHI	Cape May, Ocean	30 min
Apr 4, 2:45 PM EDT	Special Marine Warning	PHI		90 min
Apr 4, 2:58 PM EDT	Special Marine Warning	PHI		92 min
Apr 4, 12:49 PM EDT	Special Weather Statement	PHI	Kent	26 min

Nearby

Special Weather Statements in Delaware, 2018 Every special weather statement in 2018

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.