Alert archive / Delaware / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

July 19, 2012Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 19, 2012, 4:56 PM EDT for Sussex County, Delaware. It was in force for 64 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, 2012, 4:56 PM EDT (20:56 UTC)
Expired: Jul 19, 2012, 6:00 PM EDT
In force: 64 min
Issued by: NWS Philadelphia/Mount Holly

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 39 km from the middle of the area, began a volume at 20:59 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, 8.9 hours before the alert went out and 70 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: 748 J/kg
Mixed-layer CIN: -133 J/kg
Mixed-layer LCL: 1114 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 62 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.

949 
WWUS81 KPHI 192056
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
456 PM EDT THU JUL 19 2012

DEZ003-004-192200-
DELAWARE BEACHES DE-INLAND SUSSEX DE-
456 PM EDT THU JUL 19 2012

...THUNDERSTORMS WILL AFFECT SOUTHEASTERN SUSSEX COUNTY...

AT 450 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
WIDELY SCATTERED THUNDERSTORMS FROM SOUTH OF GEORGETOWN TO THE 
MARYLAND BORDER NORTH OF BERLIN. THE STORMS WILL MOVE TOWARD THE 
COAST THROUGH 600 PM. 

THE STRONGEST STORMS MAY GENERATE WIND GUSTS TO 40 MPH AND FREQUENT 
CLOUD TO GROUND LIGHTNING. IF YOU HEAR THUNDER...PLEASE MOVE 
INDOORS. DO NOT SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS. 

LAT...LON 3845 7537 3863 7537 3863 7514 3864 7514
      3863 7514 3864 7510 3864 7506 3860 7505
      3845 7504 3844 7505 3844 7535

$$

MPD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 8:08 PM EDT	Special Weather Statement	PHI	Atlantic	22 min
Jul 19, 3:04 PM EDT	Small Craft Advisory	PHI		59 hr
Jul 19, 3:10 PM EDT	Severe Thunderstorm Warning	PHI	Salem	50 min
Jul 19, 3:16 PM EDT	Special Marine Warning	PHI		30 min
Jul 19, 2:08 PM EDT	Areal Flood Advisory	PHI	New Castle	112 min
Jul 19, 2:39 PM EDT	Special Weather Statement	PHI	New Castle	66 min
Jul 19, 3:05 PM EDT	Areal Flood Advisory	PHI	New Castle	62 min
Jul 19, 6:02 PM EDT	Special Weather Statement	PHI	Kent	58 min
Jul 19, 7:08 PM EDT	Special Weather Statement	PHI	Queen Anne's	52 min

Nearby

Special Weather Statements in Delaware, 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.