Alert archive / Virginia / Mesoscale Discussions in 2015

Mesoscale Discussion 1348

July 9, 2015Sussex County, Delaware; 12 counties in Maryland; 13 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 9, 2015, 7:04 PM EDT for Sussex County, Delaware; 12 counties in Maryland; 13 counties in Virginia. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Jul 9, 2015, 7:04 PM EDT (23:04 UTC)
Expired: Jul 9, 2015, 8:30 PM EDT
In force: 86 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 26 counties

Sussex County, DE, Anne Arundel County, MD, Calvert County, MD, Caroline County, MD, Charles County, MD, Dorchester County, MD, Prince George's County, MD, Queen Anne's County, MD, Saint Mary's County, MD, Somerset County, MD, Talbot County, MD, Wicomico County, MD, Worcester County, MD, Caroline County, VA, City of Richmond, VA, Essex County, VA, Hanover County, VA, King and Queen County, VA, King George County, VA, King William County, VA, Lancaster County, VA, Middlesex County, VA, New Kent County, VA, Northumberland County, VA, Richmond County, VA, Westmoreland County, VA

The radar

The Dover AFB radar (KDOX), 88 km from the middle of the area, began a volume at 23:07 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, 11.1 hours before the alert went out and 104 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: 1 J/kg
Mixed-layer CIN: -194 J/kg
Mixed-layer LCL: 1091 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -19 m²/s²
0-3 km storm-relative helicity: -2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 9, 3:09 PM EDT	Mesoscale Discussion	SPC	Kent, New Castle	96 min
Jul 9, 4:57 PM EDT	Severe Thunderstorm Watch	SPC	Kent, New Castle, Sussex	5 hr
Jul 9, 6:25 PM EDT	Mesoscale Discussion	SPC	New Castle	95 min
Jul 9, 11:27 AM EDT	Mesoscale Discussion	SPC	Garrett	2 hr
Jul 9, 12:59 PM EDT	Mesoscale Discussion	SPC	Allegany, Anne Arundel, Baltimore, Carroll, Cecil, Frederick and 7 more	2 hr
Jul 9, 1:27 PM EDT	Tornado Watch	SPC	Allegany, Baltimore, Carroll, Frederick, Garrett, Harford and 2 more	6 hr
Jul 9, 4:55 PM EDT	Mesoscale Discussion	SPC	Allegany, Baltimore, Carroll, Cecil, Frederick, Garrett and 5 more	95 min
Jul 9, 12:15 PM EDT	Mesoscale Discussion	SPC	Buchanan, Dickenson, Lee, Wise, City of Norton	3 hr
Jul 9, 5:58 PM EDT	Mesoscale Discussion	SPC	Bland, Buchanan, Dickenson, Russell, Smyth, Tazewell and 2 more	2 hr

Nearby

Mesoscale Discussions in Virginia, 2015 Mesoscale Discussions in Maryland, 2015 Mesoscale Discussions in Delaware, 2015 Every mesoscale discussion in 2015

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.