Alert archive / Delaware / Special Weather Statements in 2011

Special Weather Statement, NWS Philadelphia/Mount Holly

June 12, 2011Kent County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Jun 12, 2011, 6:09 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: Jun 12, 2011, 6:09 PM EDT (22:09 UTC)
Expired: Jun 12, 2011, 7:15 PM EDT
In force: 66 min
Issued by: NWS Philadelphia/Mount Holly

County Kent County, DE

The radar

The Dover AFB radar (KDOX), 30 km from the middle of the area, began a volume at 22:09 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, 10.2 hours before the alert went out and 129 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: 112 J/kg
Mixed-layer CIN: -108 J/kg
Mixed-layer LCL: 869 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 70 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.

498 
WWUS81 KPHI 122209
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
609 PM EDT SUN JUN 12 2011

DEZ002-122315-
KENT DE-
609 PM EDT SUN JUN 12 2011

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

AT 605 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
STRONG THUNDERSTORM 3 MILES NORTHWEST OF KENTON...MOVING SOUTH AT 25 
MPH. THE THUNDERSTORM WILL BE NEAR HARTLY AND CHESWOLD AROUND 615 
PM...HAZLETTVILLE AND WOODSIDE AROUND 630 PM...FELTON AND VIOLA 
AROUND 645 PM...AND HARRINGTON AND HOUSTON AROUND 700 PM.

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

WIND GUSTS TO 40 MPH ARE POSSIBLE.

EXPECT SMALL HAIL AND DANGEROUS CLOUD TO GROUND LIGHTNING.

LAT...LON 3929 7576 3930 7570 3929 7568 3931 7562
      3930 7557 3911 7540 3907 7539 3903 7532
      3898 7529 3895 7530 3895 7539 3892 7541
      3890 7549 3884 7555 3883 7572

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 11:48 PM EDT	Special Weather Statement	PHI	Gloucester, Salem	57 min
Jun 12, 12:11 AM EDT	Special Weather Statement	PHI	Middlesex	64 min
Jun 12, 2:26 AM EDT	Special Weather Statement	PHI	Middlesex, Monmouth	64 min
Jun 11, 8:19 PM EDT	Areal Flood Advisory	PHI	Berks	3 hr
Jun 11, 9:06 PM EDT	Special Weather Statement	PHI	Chester	54 min
Jun 11, 9:22 PM EDT	Areal Flood Advisory	PHI	Chester	3 hr
Jun 12, 12:39 AM EDT	Special Weather Statement	PHI	Chester	66 min
Jun 12, 4:32 PM EDT	Special Weather Statement	PHI	Monroe	43 min
Jun 12, 5:18 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	57 min
Jun 12, 5:19 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	56 min
Jun 12, 6:14 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	61 min
Jun 11, 9:59 PM EDT	Areal Flood Advisory	PHI	Cecil	3 hr
Jun 11, 10:29 PM EDT	Special Weather Statement	PHI	Cecil	61 min
Jun 11, 10:52 PM EDT	Special Weather Statement	PHI	Cecil	68 min
Jun 12, 3:35 PM EDT	Special Weather Statement	PHI	Cecil	55 min
Jun 12, 3:51 PM EDT	Severe Thunderstorm Warning	PHI	Cecil	54 min
Jun 12, 4:55 PM EDT	Special Weather Statement	PHI	Kent, Queen Anne's	65 min
Jun 12, 5:08 PM EDT	Severe Thunderstorm Warning	PHI	Cecil, Kent, Queen Anne's	52 min
Jun 12, 5:55 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	65 min
Jun 12, 6:50 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Talbot	55 min
Jun 11, 11:23 PM EDT	Areal Flood Advisory	PHI	New Castle	116 min
Jun 12, 7:43 PM EDT	Special Weather Statement	PHI	Sussex	62 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.