Alert archive / Delaware / Special Weather Statements in 2011

Special Weather Statement, NWS Philadelphia/Mount Holly

July 31, 2011Kent County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 31, 2011, 2:09 PM EDT for Kent County, Delaware. It was in force for 66 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: Jul 31, 2011, 2:09 PM EDT (18:09 UTC)
Expired: Jul 31, 2011, 3:15 PM EDT
In force: 66 min
Issued by: NWS Philadelphia/Mount Holly

County Kent County, DE

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 6.2 hours before the alert went out and 135 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2108 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: 22 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.

199 
WWUS81 KPHI 311809
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
209 PM EDT SUN JUL 31 2011

DEZ002-311915-
KENT DE-
209 PM EDT SUN JUL 31 2011

...A STRONG THUNDERSTORM WILL AFFECT KENT COUNTY...

AT 207 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 6 MILES NORTHWEST OF DOVER...MOVING EAST AT 15
MPH. THE THUNDERSTORM WILL BE NEAR CHESWOLD...LEIPSIC AROUND 215
PM...DOVER SPEEDWAY...DOVER AROUND 230 PM...LITTLE CREEK...DOVER BASE
HOUSING AROUND 245 PM AND BOWERS AROUND 300 PM.

VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS STORM.

EXPECT LIGHTNING FROM THIS STORM. DO NOT SEEK SHELTER UNDER TREES 
WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A THUNDERSTORM 
APPROACHES.

LAT...LON 3903 7569 3930 7565 3931 7561 3928 7542
      3927 7540 3924 7538 3920 7538 3916 7540
      3907 7539 3903 7533 3898 7529 3894 7530

$$

TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 6:40 PM EDT	Special Weather Statement	PHI	Sussex, Warren	95 min
Jul 31, 7:39 PM EDT	Special Weather Statement	PHI	Camden	66 min
Jul 31, 7:59 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	31 min
Jul 31, 5:39 PM EDT	Special Weather Statement	PHI	Monroe	96 min
Jul 31, 7:29 PM EDT	Special Weather Statement	PHI	Berks	91 min
Jul 31, 12:30 PM EDT	Special Weather Statement	PHI	Caroline	60 min
Jul 31, 1:23 PM EDT	Special Weather Statement	PHI	Caroline	82 min
Jul 31, 2:39 PM EDT	Special Weather Statement	PHI	Talbot	96 min
Jul 31, 3:58 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Queen Anne's	36 min
Jul 31, 2:35 PM EDT	Areal Flood Advisory	PHI	Kent	115 min
Jul 31, 2:45 PM EDT	Special Weather Statement	PHI	Kent	90 min
Jul 31, 3:33 PM EDT	Flash Flood Warning	PHI	Kent, New Castle	2 hr
Jul 31, 4:36 PM EDT	Special Weather Statement	PHI	Kent	84 min
Jul 31, 4:56 PM EDT	Special Weather Statement	PHI	Sussex	64 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.