Alert archive / Delaware / Special Weather Statements in 2013

Special Weather Statement, NWS Philadelphia/Mount Holly

August 9, 2013Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 9, 2013, 7:03 PM EDT for Sussex County, Delaware. It was in force for 57 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 9, 2013, 7:03 PM EDT (23:03 UTC)
Expired: Aug 9, 2013, 8:00 PM EDT
In force: 57 min
Issued by: NWS Philadelphia/Mount Holly

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 34 km from the middle of the area, began a volume at 23:02 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, 11.1 hours before the alert went out and 81 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: 295 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 1059 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 87 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.

232 
WWUS81 KPHI 092303
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
703 PM EDT FRI AUG 9 2013

DEZ003-004-100000-
DELAWARE BEACHES DE-INLAND SUSSEX DE-
703 PM EDT FRI AUG 9 2013

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN SUSSEX COUNTY...

AT 701 PM EDT...A STRONG THUNDERSTORM WAS NEAR GEORGETOWN...MOVING
EAST AT 30 MPH.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS STORM. FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. DO NOT STAY IN THE
OPEN NOR SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE
INDOORS WHEN A THUNDERSTORM APPROACHES. VERY HEAVY RAIN WILL FALL
FROM THIS STORM...AND WILL CAUSE WATER TO POND ON ROADS AND FILL POOR
DRAINAGE AREAS. THIS THUNDERSTORM WILL BE NEAR MILLSBORO AROUND 710 
PM...DAGSBORO AROUND 715 PM...LONG NECK AROUND 720 PM...MILLVILLE 
AROUND 725 PM...OCEAN VIEW AROUND 730 PM AND BETHANY BEACH AROUND 
735 PM.

LAT...LON 3859 7547 3876 7540 3875 7507 3867 7506
      3866 7505 3866 7506 3865 7505 3861 7505
      3860 7504 3859 7505 3859 7504 3845 7504

$$

FORECASTER:JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 3:55 AM EDT	Small Craft Advisory	PHI		16 hr
Aug 9, 6:30 AM EDT	Areal Flood Advisory	PHI	Sussex, Warren	4 hr
Aug 9, 7:34 AM EDT	Flash Flood Warning	PHI	Sussex	4 hr
Aug 9, 8:03 AM EDT	Flash Flood Watch	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	11 hr
Aug 9, 8:39 AM EDT	Flash Flood Warning	PHI	Monroe	4 hr
Aug 9, 7:40 PM EDT	Flash Flood Warning	PHI	Sussex	4 hr
Aug 9, 5:08 PM EDT	Special Weather Statement	PHI	Caroline, Kent, Queen Anne's, Talbot	52 min

Nearby

Special Weather Statements in Delaware, 2013 Every special weather statement in 2013

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.