Alert archive / Delaware / Special Weather Statements in 2015

Special Weather Statement, NWS Philadelphia/Mount Holly

August 4, 2015Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 4, 2015, 11:06 PM EDT for Sussex County, Delaware. It was in force for 24 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 4, 2015, 11:06 PM EDT (03:06 UTC)
Expired: Aug 4, 2015, 11:30 PM EDT
In force: 24 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 03:06 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, 3.1 hours before the alert went out and 74 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: 961 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1098 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

802 
WWUS81 KPHI 050306
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1106 PM EDT TUE AUG 4 2015
 
DEZ003-004-050330-
DELAWARE BEACHES-INLAND SUSSEX-
1106 PM EDT TUE AUG 4 2015

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

AT 1105 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS ALONG A LINE
EXTENDING FROM NEAR MILLSBORO TO NEAR LAUREL TO NEAR CAMBRIDGE...AND
MOVING EAST AT 25 MPH.

WIND GUSTS UP TO 30 MPH ARE POSSIBLE WITH THESE STORMS.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY 
CAUSE LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED 
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. 
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE 
SHELTER INSIDE A BUILDING OR VEHICLE.

THESE STORMS WILL BE NEAR...
  GEORGETOWN...MILLSBORO...LAUREL AND DELMAR AROUND 1110 PM EDT.
  SYCAMORE AROUND 1115 PM EDT.
  DAGSBORO AROUND 1120 PM EDT.
  MILLVILLE AND GUMBORO AROUND 1130 PM EDT.

OTHER LOCATIONS IMPACTED BY THESE STORMS INCLUDE OCEAN VIEW...SOUTH
BETHANY...LONG NECK AND FRANKFORD.

LAT...LON 3846 7569 3856 7570 3856 7562 3868 7535
      3867 7513 3864 7513 3862 7508 3866 7507
      3866 7506 3862 7507 3859 7521 3857 7518
      3859 7514 3858 7507 3860 7510 3861 7506
      3860 7506 3848 7505 3845 7509
TIME...MOT...LOC 0305Z 272DEG 20KT 3863 7533 3851 7555 3851 7600 
$$

ROBERTSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 8:04 PM EDT	Special Weather Statement	PHI	Cumberland	56 min
Aug 4, 10:07 PM EDT	Special Weather Statement	PHI	Cape May	53 min
Aug 4, 10:30 PM EDT	Areal Flood Advisory	PHI	Cape May	4 hr
Aug 4, 10:40 PM EDT	Special Marine Warning	PHI		50 min
Aug 4, 10:56 PM EDT	Special Weather Statement	PHI	Cape May	19 min
Aug 4, 11:22 PM EDT	Special Marine Warning	PHI		53 min
Aug 4, 10:44 PM EDT	Special Weather Statement	PHI	Talbot	31 min
Aug 4, 11:10 PM EDT	Special Weather Statement	PHI	Caroline, Talbot	50 min
Aug 4, 11:28 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Talbot	32 min
Aug 4, 9:01 PM EDT	Special Weather Statement	PHI	New Castle	59 min
Aug 4, 10:24 PM EDT	Special Weather Statement	PHI	Sussex	51 min
Aug 4, 11:18 PM EDT	Areal Flood Advisory	PHI	Sussex	4 hr
Aug 4, 11:35 PM EDT	Flash Flood Warning	PHI	Sussex	4 hr
Aug 4, 11:43 PM EDT	Special Weather Statement	PHI	Sussex	47 min
Aug 5, 12:04 AM EDT	Special Weather Statement	PHI	Sussex	41 min
Aug 5, 12:39 AM EDT	Flash Flood Warning	PHI	Sussex	4 hr
Aug 5, 12:52 AM EDT	Special Weather Statement	PHI	Sussex	23 min

Nearby

Special Weather Statements in Delaware, 2015 Every special weather statement in 2015

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.