Alert archive / Delaware / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

August 4, 2012New Castle County, Delaware; Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 4, 2012, 1:18 PM EDT for New Castle County, Delaware; Cecil County, Maryland. It was in force for 57 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 4, 2012, 1:18 PM EDT (17:18 UTC)
Expired: Aug 4, 2012, 2:15 PM EDT
In force: 57 min
Issued by: NWS Philadelphia/Mount Holly

Counties New Castle County, DE, Cecil County, MD

The radar

The Dover AFB radar (KDOX), 113 km from the middle of the area, began a volume at 17:19 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 5.3 hours before the alert went out and 160 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: 2272 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 599 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 38 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.

447 
WWUS81 KPHI 041718
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
118 PM EDT SAT AUG 4 2012

DEZ001-MDZ008-PAZ067-041815-
CECIL MD-CHESTER PA-NEW CASTLE DE-
118 PM EDT SAT AUG 4 2012

...A STRONG THUNDERSTORM WILL AFFECT CECIL...CHESTER AND NEW CASTLE
COUNTIES...

AT 115 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 3 MILES WEST OF NEWARK...MOVING NORTH AT 15 MPH. 
THE THUNDERSTORM WILL BE NEAR KEMBLESVILLE AND GLEN WESTOVER AROUND 
130 PM...LADENBERG AND NORTH STAR AROUND 145 PM...WEST GROVE AND 
AVONDALE AROUND 200 PM...AND COCHRANVILLE AND HOMEVILLE AROUND 215 
PM.

VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL POOR DRAINAGE AREAS.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS STORM.

EXPECT SMALL HAIL AND FREQUENT...DANGEROUS CLOUD TO GROUND LIGHTNING
FROM THIS STORM.

LAT...LON 3988 7600 3990 7600 3992 7559 3952 7562
      3951 7598 3986 7602

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 1:26 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	34 min
Aug 4, 2:13 PM EDT	Severe Thunderstorm Warning	PHI	Salem	62 min
Aug 4, 2:28 PM EDT	Special Marine Warning	PHI		62 min
Aug 4, 2:53 PM EDT	Special Weather Statement	PHI	Mercer	67 min
Aug 4, 3:21 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	54 min
Aug 4, 3:35 PM EDT	Special Marine Warning	PHI		38 min
Aug 4, 3:42 PM EDT	Special Weather Statement	PHI	Middlesex, Somerset	63 min
Aug 4, 3:47 PM EDT	Small Craft Advisory	PHI		39 hr
Aug 4, 4:01 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	59 min
Aug 4, 5:30 PM EDT	Small Craft Advisory	PHI		4 hr
Aug 4, 1:12 PM EDT	Special Weather Statement	PHI	Philadelphia	63 min
Aug 4, 1:46 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	44 min
Aug 4, 2:51 PM EDT	Special Weather Statement	PHI	Northampton	54 min
Aug 4, 3:55 PM EDT	Special Weather Statement	PHI	Lebanon	65 min
Aug 4, 4:08 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	52 min
Aug 4, 4:49 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	56 min
Aug 4, 2:43 PM EDT	Areal Flood Advisory	PHI	New Castle	105 min
Aug 4, 3:31 PM EDT	Flash Flood Warning	PHI	New Castle	57 min
Aug 4, 3:31 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	28 min
Aug 4, 5:07 PM EDT	Special Weather Statement	PHI	Kent	53 min

Nearby

Special Weather Statements in Delaware, 2012 Special Weather Statements in Maryland, 2012 Every special weather statement in 2012

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.