Alert archive / Delaware / Special Weather Statements in 2011

Special Weather Statement, NWS Philadelphia/Mount Holly

June 17, 2011Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Jun 17, 2011, 12:51 AM EDT for Sussex County, Delaware. It was in force for 54 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: Jun 17, 2011, 12:51 AM EDT (04:51 UTC)
Expired: Jun 17, 2011, 1:45 AM EDT
In force: 54 min
Issued by: NWS Philadelphia/Mount Holly

County Sussex County, DE

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 4.9 hours before the alert went out and 86 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: 30 J/kg
Mixed-layer CIN: -144 J/kg
Mixed-layer LCL: 1237 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 98 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.

459 
WWUS81 KPHI 170451
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1251 AM EDT FRI JUN 17 2011

DEZ003-004-170545-
DELAWARE BEACHES DE-INLAND SUSSEX DE-
1251 AM EDT FRI JUN 17 2011

...STRONG THUNDERSTORMS WILL CONTINUE TO AFFECT SUSSEX COUNTY...

AT 1250 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
A CLUSTER OF STRONG THUNDERSTORMS MOVING ACROSS THE COUNTY. THESE 
STORMS ARE MOVING TO THE NORTHEAST AT 25 MPH.

HEAVY RAIN WILL FALL FROM THESE STORMS, AND WILL CAUSE WATER TO POND 
ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND POOR DRAINAGE AREAS.

LOCAL WIND GUSTS TO AROUND 30 MPH ARE POSSIBLE WITH THESE STORMS. 
EXPECT CLOUD TO GROUND LIGHTNING WITH THESE STORMS. DO NOT SEEK 
SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A 
THUNDERSTORM APPROACHES.

LAT...LON 3846 7568 3866 7571 3878 7570 3894 7531
      3881 7518 3879 7513 3879 7511 3881 7509
      3880 7507 3865 7505 3863 7506 3860 7504
      3856 7505

$$

FORECASTER: GORSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 16, 9:32 PM EDT	Coastal Flood Advisory	PHI	Salem	4 hr
Jun 17, 2:00 AM EDT	Special Weather Statement	PHI	Cape May	60 min
Jun 17, 4:39 AM EDT	Special Weather Statement	PHI	Mercer, Middlesex, Somerset	51 min
Jun 17, 1:30 PM EDT	Special Weather Statement	PHI	Sussex, Warren	60 min
Jun 17, 1:45 PM EDT	Special Weather Statement	PHI	Morris	45 min
Jun 17, 1:48 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	57 min
Jun 17, 3:31 PM EDT	Special Weather Statement	PHI	Middlesex	59 min
Jun 17, 3:45 PM EDT	Special Weather Statement	PHI	Cumberland, Gloucester, Salem	60 min
Jun 17, 4:48 PM EDT	Special Weather Statement	PHI	Monmouth	57 min
Jun 17, 7:35 PM EDT	Special Marine Warning	PHI		25 min
Jun 17, 4:05 AM EDT	Special Weather Statement	PHI	Philadelphia	55 min
Jun 17, 3:10 AM EDT	Coastal Flood Advisory	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	9 hr
Jun 17, 2:34 PM EDT	Special Weather Statement	PHI	Cecil	56 min
Jun 17, 7:02 PM EDT	Special Weather Statement	PHI	Caroline, Talbot	58 min
Jun 17, 7:23 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's, Talbot	52 min
Jun 16, 11:45 PM EDT	Special Weather Statement	PHI	Sussex	60 min

Nearby

Special Weather Statements in Delaware, 2011 Every special weather statement in 2011

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.