Alert archive / Virginia / Mesoscale Discussions in 2016

Mesoscale Discussion 1008

June 21, 20164 states

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2016, 6:30 PM EDT for 4 states. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Jun 21, 2016, 6:30 PM EDT (22:30 UTC)
Expired: Jun 21, 2016, 8:00 PM EDT
In force: 90 min
Issued by: the Storm Prediction Center

All 58 counties

Kent County, DE, Sussex County, DE, Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Caroline County, MD, Carroll County, MD, Cecil County, MD, Charles County, MD, City of Baltimore, MD, Dorchester County, MD, Frederick County, MD, Harford County, MD, Howard County, MD, Kent County, MD, Montgomery County, MD, Prince George's County, MD, Queen Anne's County, MD, Saint Mary's County, MD, Somerset County, MD, Talbot County, MD, Washington County, MD, Wicomico County, MD, Worcester County, MD, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Harrisonburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, Greene County, VA, King George County, VA, Loudoun County, VA, Madison County, VA, Orange County, VA, Page County, VA, Prince William County, VA, Rappahannock County, VA, Rockingham County, VA, Shenandoah County, VA, Spotsylvania County, VA, Stafford County, VA, Warren County, VA, Westmoreland County, VA, Berkeley County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Morgan County, WV

The radar

The Sterling radar (KLWX), 18 km from the middle of the area, began a volume at 22:33 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, 10.5 hours before the alert went out and 20 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: 719 J/kg
Mixed-layer CIN: -132 J/kg
Mixed-layer LCL: 1478 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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
Jun 21, 12:00 PM EDT	Mesoscale Discussion	SPC	Kent, New Castle	90 min
Jun 21, 1:06 PM EDT	Severe Thunderstorm Watch	SPC	Kent, New Castle, Sussex	9 hr
Jun 21, 2:01 PM EDT	Severe Thunderstorm Watch	SPC	Garrett	8 hr
Jun 21, 3:34 PM EDT	Mesoscale Discussion	SPC	Calvert, Charles, Dorchester, Prince George's, Saint Mary's, Somerset and 1 more	86 min
Jun 21, 1:08 PM EDT	Mesoscale Discussion	SPC	Buchanan	97 min
Jun 21, 4:26 PM EDT	Mesoscale Discussion	SPC	Buchanan, Dickenson, Lee, Russell, Tazewell, Wise and 1 more	94 min

Nearby

Mesoscale Discussions in Virginia, 2016 Mesoscale Discussions in Maryland, 2016 Mesoscale Discussions in West Virginia, 2016 Every mesoscale discussion in 2016

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.