Alert archive / Maryland / Special Weather Statements in 2017

Special Weather Statement, NWS Philadelphia/Mount Holly

August 15, 2017Kent County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 15, 2017, 1:39 PM EDT for Kent County, Maryland. It was in force for 66 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 15, 2017, 1:39 PM EDT (17:39 UTC)
Expired: Aug 15, 2017, 2:45 PM EDT
In force: 66 min
Issued by: NWS Philadelphia/Mount Holly

County Kent County, MD

The radar

The Dover AFB radar (KDOX), 79 km from the middle of the area, began a volume at 17:42 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, 5.7 hours before the alert went out and 119 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: 274 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 491 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

643 
WWUS81 KPHI 151739
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
139 PM EDT TUE AUG 15 2017

MDZ008-012-015-151845-
Queen Anne's-Cecil-Kent-
139 PM EDT TUE AUG 15 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTH CENTRAL QUEEN ANNE'S...
KENT AND SOUTH CENTRAL CECIL COUNTIES...

At 138 PM EDT, a strong thunderstorm was located near Millers Island,
moving east at 15 mph.

Wind gusts up to 30 mph and are possible with this storm.

Heavy rainfall is also occurring with this storm...and may cause 
ponding on roadways and poor drainage areas. Do not drive your 
vehicle through flooded roadways.

Occasional lightning is occurring with this storm. 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...
Chestertown, Rock Hall, Church Hill, Betterton, Newtown, Starkey
Corner, Morgnec, Old Town, Crumpton, Kennedyville, Langford and
Kingstown.

LAT...LON 3926 7622 3929 7617 3932 7618 3934 7616
      3933 7614 3937 7611 3937 7606 3943 7599
      3945 7601 3949 7600 3951 7592 3910 7592
      3908 7623 3915 7628
TIME...MOT...LOC 1738Z 261DEG 15KT 3924 7630 

$$

Robertson

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 9:44 PM EDT	Small Craft Advisory for Hazardous Seas	PHI		41 hr
Aug 15, 6:06 PM EDT	Areal Flood Advisory	PHI	Cumberland	4 hr
Aug 15, 6:54 PM EDT	Rip Current Statement	PHI	Atlantic, Cape May, Monmouth, Ocean	26 hr
Aug 15, 1:06 PM EDT	Areal Flood Advisory	PHI	Chester	4 hr
Aug 15, 2:54 PM EDT	Special Weather Statement	PHI	Queen Anne's	51 min
Aug 15, 3:21 PM EDT	Areal Flood Advisory	PHI	Caroline, Kent, Queen Anne's, Talbot	4 hr
Aug 15, 3:25 PM EDT	Special Weather Statement	PHI	Sussex	50 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.