Alert archive / Maryland / Special Weather Statements in 2017

Special Weather Statement, NWS Philadelphia/Mount Holly

July 28, 2017Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 28, 2017, 3:08 PM EDT for Talbot County, Maryland. It was in force for 52 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, 3:08 PM EDT (19:08 UTC)
Expired: Jul 28, 2017, 4:00 PM EDT
In force: 52 min
Issued by: NWS Philadelphia/Mount Holly

County Talbot County, MD

The radar

The Dover AFB radar (KDOX), 66 km from the middle of the area, began a volume at 19:12 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, 7.1 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: 108 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 867 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

500 
WWUS81 KPHI 281908
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
308 PM EDT FRI JUL 28 2017

MDZ015-019-020-282000-
Queen Anne's-Talbot-Caroline-
308 PM EDT FRI JUL 28 2017

...SHOWERS AND THUNDERSTORMS WILL AFFECT TALBOT...SOUTHWESTERN QUEEN 
ANNE'S AND SOUTHWESTERN CAROLINE COUNTIES...

At 307 PM EDT, radar indicated showers and thunderstorms were 
located along a line extending from Copperville to near Easton to 
Tanyard. Movement was northwest at 5 mph. Additional showers and 
thunderstorms were spread out across other parts of the counties as 
well.

Heavy rainfall is occurring with these showers and thunderstorms... 
and may cause ponding on roadways and poor drainage areas. Do not 
drive your vehicle through flooded roadways.

Ocasional cloud to ground lightning is occuring. Lightning can 
strike 15 miles away from a thunderstorm. If you see lightning or 
hear thunder seek a safe shelter inside a building or vehicle.

Locations impacted include...
Easton, Talbot, Trappe, St. Michaels, Preston, Oxford, Queen Anne,
Tanyard, Grasonville, Stevensville, Skipton, Copperville, Chester,
Matthews, Choptank, Wye Mills, Hambleton, Windyhill, Cordova and
Queenstown.

LAT...LON 3897 7627 3894 7628 3897 7633 3890 7636
      3902 7632 3897 7622 3900 7617 3903 7619
      3897 7599 3887 7592 3869 7590 3859 7599
      3857 7602 3868 7621 3876 7622 3871 7628
      3878 7629 3875 7632 3867 7634 3868 7634
TIME...MOT...LOC 1907Z 147DEG 6KT 3883 7618 3882 7604 3877 7596 

$$

Robertson

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, 5:06 AM EDT	Special Weather Statement	PHI	Caroline, Kent, Queen Anne's	54 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, 3:39 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 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.