Alert archive / Maryland / Mesoscale Discussions in 2017

Mesoscale Discussion 1314

July 14, 2017Somerset County, Wicomico County, Worcester County, Maryland; King and Queen County, Lancaster County, Northumberland County, Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 14, 2017, 7:00 PM EDT for Somerset County, Wicomico County, Worcester County, Maryland; King and Queen County, Lancaster County, Northumberland County, Virginia. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jul 14, 2017, 7:00 PM EDT (23:00 UTC)
Expired: Jul 14, 2017, 8:00 PM EDT
In force: 60 min
Issued by: the Storm Prediction Center

Counties Somerset County, MD, Wicomico County, MD, Worcester County, MD, King and Queen County, VA, Lancaster County, VA, Northumberland County, VA

The radar

The Dover AFB radar (KDOX), 103 km from the middle of the area, began a volume at 23:04 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, 11.0 hours before the alert went out and 60 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: 908 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 959 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 14, 1:09 PM EDT	Mesoscale Discussion	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Caroline, Carroll and 16 more	2 hr
Jul 14, 1:40 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Caroline, Carroll and 13 more	7 hr
Jul 14, 4:23 PM EDT	Mesoscale Discussion	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Caroline, Carroll and 18 more	67 min

Nearby

Mesoscale Discussions in Maryland, 2017 Mesoscale Discussions in Virginia, 2017 Every mesoscale discussion 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.