Alert archive / Virginia / Mesoscale Discussions in 2011

Mesoscale Discussion 1057

June 1, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jun 1, 2011, 6:27 PM EDT for 4 states. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Jun 1, 2011, 6:27 PM EDT (22:27 UTC)
Expired: Jun 1, 2011, 8:00 PM EDT
In force: 93 min
Issued by: the Storm Prediction Center

All 51 counties

Kent County, DE, New Castle County, DE, Sussex County, DE, Anne Arundel County, MD, Calvert County, MD, Caroline County, MD, Charles County, MD, Dorchester County, MD, Kent 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, Atlantic County, NJ, Cape May County, NJ, Cumberland County, NJ, Salem County, NJ, Albemarle County, VA, Arlington County, VA, Augusta County, VA, Caroline County, VA, City of Alexandria, VA, City of Charlottesville, 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 Staunton, VA, City of Waynesboro, VA, Culpeper County, VA, Essex County, VA, Fairfax County, VA, Fauquier County, VA, Greene County, VA, King George County, VA, Louisa County, VA, Madison County, VA, Orange County, VA, Page County, VA, Prince William County, VA, Rappahannock County, VA, Richmond County, VA, Rockingham County, VA, Spotsylvania County, VA, Stafford County, VA, Westmoreland County, VA

The radar

The Sterling radar (KLWX), 56 km from the middle of the area, began a volume at 22:28 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 48 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: 3637 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 975 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 67 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

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
Jun 1, 1:37 PM EDT	Mesoscale Discussion	SPC	Kent, New Castle	83 min
Jun 1, 2:24 PM EDT	Severe Thunderstorm Watch	SPC	Kent, New Castle, Sussex	7 hr
Jun 1, 12:26 PM EDT	Mesoscale Discussion	SPC	Bergen, Essex, Hudson, Hunterdon, Middlesex, Morris and 5 more	64 min
Jun 1, 12:58 PM EDT	Tornado Watch	SPC	Bergen, Burlington, Camden, Essex, Gloucester, Hudson and 11 more	7 hr
Jun 1, 7:09 PM EDT	Mesoscale Discussion	SPC	Bergen, Essex, Hudson, Mercer, Middlesex, Monmouth and 5 more	96 min
Jun 1, 4:35 PM EDT	Mesoscale Discussion	SPC	Alleghany, Bland, Botetourt, Buchanan, Carroll, Craig and 26 more	85 min

Nearby

Mesoscale Discussions in Virginia, 2011 Mesoscale Discussions in Maryland, 2011 Mesoscale Discussions in New Jersey, 2011 Every mesoscale discussion in 2011

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.