Alert archive / Delaware / Special Weather Statements in 2018

Special Weather Statement, NWS Philadelphia/Mount Holly

September 7, 2018Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Sep 7, 2018, 11:40 PM EDT for Sussex County, Delaware. It was in force for 35 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: Sep 7, 2018, 11:40 PM EDT (03:40 UTC)
Expired: Sep 8, 2018, 12:15 AM EDT
In force: 35 min
Issued by: NWS Philadelphia/Mount Holly

County Sussex County, DE

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 3.7 hours before the alert went out and 72 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: 1567 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 957 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

951 
WWUS81 KPHI 080340
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
1140 PM EDT FRI SEP 7 2018

DEZ003-004-080415-
Inland Sussex-Delaware Beaches-
1140 PM EDT FRI SEP 7 2018

...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN SUSSEX
COUNTY...

At 1140 PM EDT, a cluster of strong thunderstorms was near Millville,
or 12 miles northwest of Ocean City, moving southeast at 15 mph.

Winds up to 40 mph are possible with this storm.

Locations impacted include...
Selbyville, Dagsboro, Millville, Long Neck, Ocean View, Frankford and
South Bethany.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 3849 7531 3863 7518 3861 7514 3859 7518
      3859 7521 3858 7518 3857 7518 3859 7514
      3858 7506 3845 7505 3845 7526
TIME...MOT...LOC 0340Z 307DEG 12KT 3852 7518 

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 8:32 PM EDT	Flash Flood Warning	PHI	Camden, Gloucester, Salem	2 hr
Sep 7, 10:41 PM EDT	Areal Flood Warning	PHI	Camden, Gloucester	8 hr
Sep 7, 11:19 PM EDT	Rip Current Statement	PHI	Atlantic, Cape May, Monmouth, Ocean	9 days
Sep 7, 11:20 PM EDT	Areal Flood Warning	PHI	Camden, Gloucester, Salem	4 hr
Sep 8, 1:21 AM EDT	Special Marine Warning	PHI		54 min
Sep 8, 1:27 AM EDT	Special Marine Warning	PHI		63 min
Sep 8, 2:17 AM EDT	Special Marine Warning	PHI		42 min
Sep 8, 2:43 AM EDT	Areal Flood Advisory	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	6 hr
Sep 8, 3:34 AM EDT	Flood Watch	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Hunterdon and 9 more	60 hr
Sep 8, 4:29 AM EDT	Areal Flood Advisory	PHI	Burlington	4 hr
Sep 8, 5:31 AM EDT	Coastal Flood Watch	PHI	Cape May	11 hr
Sep 8, 5:31 AM EDT	Coastal Flood Advisory	PHI	Atlantic, Burlington, Cumberland, Middlesex, Monmouth, Ocean and 1 more	21 hr
Sep 8, 5:31 AM EDT	Coastal Flood Advisory	PHI	Burlington, Camden, Gloucester, Mercer	24 hr
Sep 8, 8:15 AM EDT	Areal Flood Advisory	PHI	Camden, Gloucester, Salem	119 min
Sep 8, 3:36 PM EDT	Gale Warning	PHI		48 hr
Sep 8, 4:49 PM EDT	Coastal Flood Watch	PHI	Atlantic, Burlington, Cape May, Cumberland, Monmouth, Ocean and 1 more	7 hr
Sep 8, 4:49 PM EDT	Coastal Flood Warning	PHI	Cape May, Cumberland	6 hr
Sep 8, 4:49 PM EDT	High Surf Advisory	PHI	Atlantic, Cape May, Monmouth, Ocean	60 hr
Sep 8, 2:41 AM EDT	Areal Flood Warning	PHI	Berks, Montgomery	4 hr
Sep 8, 12:11 AM EDT	Flash Flood Warning	PHI	Sussex	4 hr
Sep 8, 11:54 AM EDT	Special Weather Statement	PHI	Sussex	21 min
Sep 7, 10:51 PM EDT	Special Weather Statement	PHI	Talbot	39 min
Sep 7, 11:36 PM EDT	Special Weather Statement	PHI	Talbot	24 min
Sep 8, 2:19 AM EDT	Special Weather Statement	PHI	Queen Anne's	41 min
Sep 8, 3:14 AM EDT	Flash Flood Warning	PHI	Kent, Queen Anne's, Talbot	3 hr
Sep 8, 6:01 AM EDT	Areal Flood Warning	PHI	Kent, Queen Anne's, Talbot	4 hr

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.