Alert archive / Delaware / Special Weather Statements in 2011

Special Weather Statement, NWS Philadelphia/Mount Holly

July 19, 2011Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 19, 2011, 8:51 PM 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: Jul 19, 2011, 8:51 PM EDT (00:51 UTC)
Expired: Jul 19, 2011, 9:45 PM EDT
In force: 54 min
Issued by: NWS Philadelphia/Mount Holly

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 11 km from the middle of the area, began a volume at 00:51 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, 0.9 hours before the alert went out and 95 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: 732 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 1330 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 1 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.

932 
WWUS81 KPHI 200051
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
851 PM EDT TUE JUL 19 2011

DEZ003-004-200145-
DELAWARE BEACHES DE-INLAND SUSSEX DE-
851 PM EDT TUE JUL 19 2011

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

AT 847 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 14 MILES SOUTHEAST OF DOVER...MOVING SOUTH AT 30
MPH. THE THUNDERSTORM WILL BE NEAR SLAUGHTER BEACH...MILFORD AROUND
900 PM...MILTON...GEORGETOWN AROUND 920 PM...MILLSBORO...DAGSBORO 
AROUND 935 PM.

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

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS STORM.

EXPECT FREQUENT...CLOUD TO GROUND LIGHTNING FROM THIS STORM.

LAT...LON 3846 7564 3884 7559 3884 7555 3890 7549
      3892 7541 3895 7539 3895 7533 3894 7530
      3881 7518 3879 7513 3879 7511 3881 7509
      3880 7507 3845 7504

$$

JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 8:03 PM EDT	Special Marine Warning	PHI		117 min
Jul 19, 8:13 PM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland	62 min
Jul 20, 4:04 AM EDT	Excessive Heat Watch	PHI	Atlantic, Burlington, Cape May, Cumberland, Hunterdon, Middlesex and 7 more	11 hr
Jul 19, 8:07 PM EDT	Severe Thunderstorm Warning	PHI	Chester	53 min
Jul 20, 5:22 PM EDT	Special Weather Statement	PHI	Monroe	53 min
Jul 19, 9:27 PM EDT	Special Weather Statement	PHI	Caroline, Kent, Queen Anne's, Talbot	93 min
Jul 19, 8:19 PM EDT	Severe Thunderstorm Warning	PHI	Kent	56 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; radar from the NEXRAD Level II archive.