Alert archive / Delaware / Special Weather Statements in 2013

Special Weather Statement, NWS Philadelphia/Mount Holly

August 1, 2013Kent County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 1, 2013, 11:06 PM EDT for Kent 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
Aug 1, 2013, 11:06 PM EDT (03:06 UTC)
Expired
Aug 2, 2013, 12:00 AM EDT
In force
54 min
Issued by
NWS Philadelphia/Mount Holly

County Kent County, DE

The radar

The Dover AFB radar (KDOX), 15 km from the middle of the area, began a volume at 03:08 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 114 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-pSkew-T log-p diagram, Wallops Is Stn, VA at 00:00Z on 2013-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 578 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 00:00Z on 2013-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 63 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
578 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
695 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
63 m²/s²
0-3 km storm-relative helicity
59 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.

055 
WWUS81 KPHI 020306
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1106 PM EDT THU AUG 1 2013

DEZ002-003-020400-
INLAND SUSSEX DE-KENT DE-
1106 PM EDT THU AUG 1 2013

...A STRONG THUNDERSTORM WILL AFFECT NORTH CENTRAL SUSSEX AND
SOUTHERN KENT COUNTIES...

AT 1104 PM EDT...A STRONG THUNDERSTORM WAS 14 MILES SOUTHWEST OF
DOVER...MOVING EAST AT 20 MPH.

WIND GUSTS TO 30 MPH ARE POSSIBLE WITH THIS STORM. VERY HEAVY RAIN
WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO POND ON ROADS AND
FILL POOR DRAINAGE AREAS. THE RAIN CAN CAUSE RAPID RISES ON SMALL
STREAMS AND CREEKS. THIS STORM WILL BE NEAR FELTON AROUND 1120 PM...
HOUSTON AROUND 1130 PM...BOWERS AROUND 1140 PM...MILFORD AROUND 1150
PM AND SLAUGHTER BEACH AROUND MIDNIGHT.

LAT...LON 3894 7573 3908 7569 3906 7538 3902 7533
      3899 7530 3893 7530 3892 7530 3889 7527
      3880 7531

$$

TFG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 1, 8:54 PM EDTSpecial Weather StatementPHIKent66 min
Aug 1, 9:23 PM EDTAreal Flood AdvisoryPHIKent3 hr
Aug 1, 9:53 PM EDTSevere Thunderstorm WarningPHIKent, Queen Anne's67 min
Aug 1, 10:24 PM EDTAreal Flood AdvisoryPHIQueen Anne's3 hr
Aug 1, 11:01 PM EDTSpecial Weather StatementPHIQueen Anne's59 min

Nearby

Special Weather Statements in Delaware, 2013Every 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.