Alert archive / Maryland / Special Weather Statements in 2017

Special Weather Statement, NWS Philadelphia/Mount Holly

July 28, 2017Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 28, 2017, 1:39 PM EDT for Queen Anne's County, Maryland. It was in force for 36 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, 1:39 PM EDT (17:39 UTC)
Expired: Jul 28, 2017, 2:15 PM EDT
In force: 36 min
Issued by: NWS Philadelphia/Mount Holly

County Queen Anne's County, MD

The radar

The Dover AFB radar (KDOX), 73 km from the middle of the area, began a volume at 17:40 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 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.

934 
WWUS81 KPHI 281739
SPSPHI

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

MDZ012-281815-
Kent-
139 PM EDT FRI JUL 28 2017

...A SHOWER WILL AFFECT NORTHWESTERN QUEEN ANNE'S AND SOUTHWESTERN
KENT COUNTIES...

At 138 PM EDT, a shower was located over Rock Hall, or 10 miles
northwest of Centerville. The shower is nearly stationary.

Locations impacted include...
Rock Hall, Overton, Old Town and Langford. 

Heavy rainfall is occurring with this shower...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.

LAT...LON 3919 7626 3921 7624 3919 7607 3918 7606
      3910 7613 3910 7615 3908 7618 3901 7621
      3902 7623 3904 7624 3909 7623 3913 7625
      3915 7628
TIME...MOT...LOC 1738Z 137DEG 2KT 3913 7622 

$$

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, 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 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.