Alert archive / Maryland / Special Weather Statements in 2017

Special Weather Statement, NWS Philadelphia/Mount Holly

July 28, 2017Caroline County, Kent County, Queen Anne's County, Maryland; Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 28, 2017, 5:06 AM EDT for Caroline County, Kent County, Queen Anne's County, Maryland; 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 28, 2017, 5:06 AM EDT (09:06 UTC)
Expired: Jul 28, 2017, 6:00 AM EDT
In force: 54 min
Issued by: NWS Philadelphia/Mount Holly

Counties Sussex County, DE, Caroline County, MD, Kent County, MD, Queen Anne's County, MD

The radar

The Dover AFB radar (KDOX), 20 km from the middle of the area, began a volume at 09:09 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 00:00Z, 9.1 hours before the alert went out and 105 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: 212 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 1015 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 157 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

592 
WWUS81 KPHI 280906
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
506 AM EDT FRI JUL 28 2017

DEZ002>004-MDZ012-015-019-020-281000-
Inland Sussex-Kent-Delaware Beaches-Queen
Anne's-Talbot-Kent-Caroline-
506 AM EDT FRI JUL 28 2017

...AN AREA OF SHOWERS AND A FEW STRONG THUNDERSTORMS WILL AFFECT 
SUSSEX...SOUTHERN KENT...NORTHEASTERN TALBOT...QUEEN 
ANNE'S...CAROLINE AND WESTERN KENT COUNTIES...

At 505 AM EDT, strong thunderstorms were clustered over Milford, or 
15 miles north of Georgetown, moving east at 15 mph. Other showers 
and thunderstorms may develop across Northeast Maryland over the 
next hour also. 

Locations impacted include...
Georgetown, Centerville, Milford, Seaford, Chestertown, Denton,
Centreville, Millsboro, Harrington, Camden, Lewes, Milton,
Bridgeville, Greensboro, Oakland, Ridgely, Rock Hall, Dagsboro,
Church Hill and Millville.

LAT...LON 3889 7621 3897 7625 3891 7624 3895 7636
      3904 7631 3898 7628 3900 7617 3917 7628
      3934 7616 3903 7534 3891 7531 3879 7510
      3880 7509 3867 7507 3864 7513 3866 7507
      3861 7506 3859 7521 3860 7506 3846 7505
TIME...MOT...LOC 0905Z 274DEG 12KT 3890 7547 

$$

PO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 5:49 AM EDT	Dense Fog Advisory	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	3 hr
Jul 28, 1:35 PM EDT	Special Weather Statement	PHI	Cumberland	40 min
Jul 28, 3:14 PM EDT	Gale Warning	PHI		30 hr
Jul 28, 3:14 PM EDT	Small Craft Advisory	PHI		57 hr
Jul 28, 2:36 PM EDT	Special Weather Statement	PHI	Monroe	39 min
Jul 28, 2:55 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	4 hr
Jul 27, 9:28 PM EDT	Special Weather Statement	PHI	Talbot	32 min
Jul 28, 11:42 AM EDT	Special Weather Statement	PHI	Talbot	48 min
Jul 28, 12:33 PM EDT	Special Weather Statement	PHI	Talbot	42 min
Jul 28, 1:39 PM EDT	Special Weather Statement	PHI	Queen Anne's	36 min
Jul 28, 3:08 PM EDT	Special Weather Statement	PHI	Talbot	52 min
Jul 28, 3:39 PM EDT	Areal Flood Advisory	PHI	Caroline, Queen Anne's, Talbot	9 hr
Jul 28, 3:14 PM EDT	Special Weather Statement	PHI	Sussex	46 min

Nearby

Special Weather Statements in Maryland, 2017 Special Weather Statements in Delaware, 2017 Every special weather statement in 2017

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.