Alert archive / Delaware / Special Weather Statements in 2011

Special Weather Statement, NWS Philadelphia/Mount Holly

August 7, 2011Kent County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 7, 2011, 6:31 PM EDT for Kent County, Delaware. It was in force for 29 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 7, 2011, 6:31 PM EDT (22:31 UTC)
Expired: Aug 7, 2011, 7:00 PM EDT
In force: 29 min
Issued by: NWS Philadelphia/Mount Holly

County Kent County, DE

The radar

The Dover AFB radar (KDOX), 53 km from the middle of the area, began a volume at 22:35 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, 10.5 hours before the alert went out and 152 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: 651 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 695 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 85 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.

341 
WWUS81 KPHI 072231
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
631 PM EDT SUN AUG 7 2011

DEZ001-002-072300-
KENT DE-NEW CASTLE DE-
631 PM EDT SUN AUG 7 2011

...A THUNDERSTORM WILL AFFECT KENT AND NEW CASTLE COUNTIES...

AT 627 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
THUNDERSTORM 9 MILES SOUTH OF MIDDLETOWN...MOVING SOUTHEAST AT 30 
MPH. THE THUNDERSTORM WILL BE NEAR SMYRNA...CHAMBERSVILLE AROUND 640 
PM...CHESWOLD AROUND 645 PM...LEIPSIC...WOODLAND BEACH AROUND 650 
PM...DOVER SPEEDWAY...DOVER AND KENT ACRES AROUND 655 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.

LAT...LON 3928 7575 3943 7576 3938 7550 3934 7547
      3932 7543 3925 7539 3905 7541

$$

FORECASTER: DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 8:49 PM EDT	Flood Watch	PHI	Morris, Sussex, Warren	9 hr
Aug 6, 10:33 PM EDT	Areal Flood Advisory	PHI	Warren	6 hr
Aug 7, 12:42 AM EDT	Special Weather Statement	PHI	Morris	63 min
Aug 7, 1:32 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Warren	3 hr
Aug 7, 1:54 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Sussex, Warren	3 hr
Aug 7, 3:56 AM EDT	Special Weather Statement	PHI	Hunterdon	64 min
Aug 7, 4:45 AM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	60 min
Aug 7, 5:10 AM EDT	Areal Flood Advisory	PHI	Morris, Somerset	81 min
Aug 7, 5:30 AM EDT	Special Weather Statement	PHI	Mercer, Middlesex	60 min
Aug 7, 6:03 AM EDT	Flash Flood Watch	PHI	Sussex, Warren	14 hr
Aug 7, 3:25 PM EDT	Special Weather Statement	PHI	Mercer	35 min
Aug 7, 3:34 PM EDT	Special Weather Statement	PHI	Warren	26 min
Aug 7, 3:48 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Monmouth, Ocean	27 min
Aug 7, 4:19 PM EDT	Special Weather Statement	PHI	Monmouth	41 min
Aug 7, 5:02 PM EDT	Special Weather Statement	PHI	Sussex	28 min
Aug 7, 6:49 PM EDT	Special Weather Statement	PHI	Sussex	41 min
Aug 7, 7:11 PM EDT	Special Weather Statement	PHI	Sussex	49 min
Aug 7, 7:35 PM EDT	Special Weather Statement	PHI	Sussex	25 min
Aug 6, 10:06 PM EDT	Special Weather Statement	PHI	Berks	84 min
Aug 6, 10:14 PM EDT	Special Weather Statement	PHI	Pike	61 min
Aug 7, 12:48 AM EDT	Special Weather Statement	PHI	Montgomery	57 min
Aug 7, 2:29 AM EDT	Flash Flood Warning	PHI	Berks, Lehigh, Northampton	3 hr
Aug 7, 3:07 PM EDT	Special Weather Statement	PHI	Philadelphia	23 min
Aug 7, 7:20 PM EDT	Special Weather Statement	PHI	Monroe	40 min
Aug 7, 3:02 PM EDT	Special Weather Statement	PHI	Cecil	28 min
Aug 7, 4:50 PM EDT	Special Weather Statement	PHI	Cecil	40 min
Aug 7, 5:39 PM EDT	Special Weather Statement	PHI	Cecil	36 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.