Alert archive / Delaware / Special Weather Statements in 2015

Special Weather Statement, NWS Philadelphia/Mount Holly

August 1, 2015Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 1, 2015, 10:30 PM EDT for Sussex County, Delaware. It was in force for 60 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 1, 2015, 10:30 PM EDT (02:30 UTC)
Expired: Aug 1, 2015, 11:30 PM EDT
In force: 60 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 02:31 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, 2.5 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.

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: 318 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 1578 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 60 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

270 
WWUS81 KPHI 020230
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1030 PM EDT SAT AUG 1 2015
 
DEZ003-004-020330-
DELAWARE BEACHES-INLAND SUSSEX-
1030 PM EDT SAT AUG 1 2015

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

AT 1029 PM EDT...AN AREA OF STRONG THUNDERSTORMS WAS OVER
GEORGETOWN...MOVING EAST AT 25 MPH.

WIND GUSTS UP TO 40 MPH ARE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
GEORGETOWN...MILLSBORO...LEWES...MILTON...MILLVILLE...HENLOPEN
ACRES...LONG NECK...OCEAN VIEW AND DEWEY BEACH.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...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.

LAT...LON 3859 7548 3877 7545 3878 7508 3867 7507
      3869 7514 3864 7513 3862 7508 3866 7507
      3866 7506 3861 7506 3859 7521 3857 7518
      3858 7507 3860 7509 3860 7506 3853 7505
      3854 7509
TIME...MOT...LOC 0229Z 276DEG 21KT 3868 7536 
$$

KLINE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 10:22 PM EDT	Special Marine Warning	PHI		53 min
Aug 1, 10:47 PM EDT	Special Marine Warning	PHI		88 min
Aug 2, 2:58 PM EDT	Small Craft Advisory	PHI		61 hr
Aug 1, 10:53 PM EDT	Areal Flood Advisory	PHI	Sussex	3 hr
Aug 2, 12:16 AM EDT	Areal Flood Advisory	PHI	Sussex	3 hr

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.