Alert archive / Virginia / Mesoscale Discussions in 2011

Mesoscale Discussion 2067

August 27, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Aug 27, 2011, 1:01 PM EDT for 4 states. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Aug 27, 2011, 1:01 PM EDT (17:01 UTC)
Expired: Aug 27, 2011, 3:00 PM EDT
In force: 119 min
Issued by: the Storm Prediction Center

All 50 counties

Kent County, DE, New Castle County, DE, Sussex County, DE, Calvert County, MD, Caroline County, MD, Dorchester County, MD, Kent 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, Gloucester County, NJ, Salem County, NJ, Accomack County, VA, Charles City County, VA, City of Chesapeake, VA, City of Franklin, VA, City of Hampton, VA, City of Hopewell, VA, City of Newport News, VA, City of Norfolk, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA, City of Williamsburg, VA, Essex County, VA, Gloucester County, VA, Isle of Wight County, VA, James City County, VA, King and Queen County, VA, King William County, VA, Lancaster County, VA, Mathews County, VA, Middlesex County, VA, New Kent County, VA, Northampton County, VA, Northumberland County, VA, Prince George County, VA, Richmond County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA, Westmoreland County, VA, York County, VA

The radar

The Dover AFB radar (KDOX), 94 km from the middle of the area, began a volume at 17:05 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, 5.0 hours before the alert went out and 82 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: 330 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 691 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 221 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.9

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
Aug 27, 7:52 AM EDT	Mesoscale Discussion	SPC	Sussex	113 min
Aug 27, 10:31 AM EDT	Mesoscale Discussion	SPC	Sussex	29 min
Aug 27, 10:41 AM EDT	Tornado Watch	SPC	Kent, New Castle, Sussex	9 hr
Aug 27, 4:44 PM EDT	Mesoscale Discussion	SPC	Sussex	2 hr
Aug 27, 7:31 PM EDT	Mesoscale Discussion	SPC	New Castle	89 min
Aug 27, 7:56 PM EDT	Tornado Watch	SPC	Kent, New Castle, Sussex	9 hr
Aug 27, 12:32 AM EDT	Tornado Watch	SPC	Somerset, Wicomico, Worcester	10 hr
Aug 27, 3:06 AM EDT	Mesoscale Discussion	SPC	Somerset, Wicomico, Worcester	114 min
Aug 26, 11:06 PM EDT	Mesoscale Discussion	SPC	Brunswick, Charles City, Chesterfield, Dinwiddie, Gloucester, Greensville and 30 more	84 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.