Alert archive / Virginia / Mesoscale Discussions in 2011

Mesoscale Discussion 1376

June 24, 20117 states

The Storm Prediction Center issued this mesoscale discussion at Jun 24, 2011, 4:13 PM EDT for 7 states. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Jun 24, 2011, 4:13 PM EDT (20:13 UTC)
Expired: Jun 24, 2011, 5:45 PM EDT
In force: 92 min
Issued by: the Storm Prediction Center

All 94 counties

Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Cecil 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, Beaufort County, NC, Bertie County, NC, Camden County, NC, Chowan County, NC, Currituck County, NC, Edgecombe County, NC, Gates County, NC, Halifax County, NC, Hertford County, NC, Hyde County, NC, Martin County, NC, Nash County, NC, Northampton County, NC, Pasquotank County, NC, Perquimans County, NC, Pitt County, NC, Tyrrell County, NC, Washington County, NC, Wilson County, NC, Atlantic County, NJ, Bergen County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Essex County, NJ, Gloucester County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Passaic County, NJ, Salem County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, New York County, NY, Richmond County, NY, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA, Pike County, PA, Accomack County, VA, Charles City County, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Emporia, VA, City of Franklin, VA, City of Hampton, VA, City of Hopewell, VA, City of Newport News, VA, City of Norfolk, VA, City of Petersburg, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA, City of Williamsburg, VA, Dinwiddie County, VA, Gloucester County, VA, Greensville County, VA, Isle of Wight County, VA, James City 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, Southampton County, VA, Surry County, VA, Sussex County, VA, York County, VA

The radar

The Dover AFB radar (KDOX), 108 km from the middle of the area, began a volume at 20:15 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.2 hours before the alert went out and 180 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: 822 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 899 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.5

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 24, 12:46 PM EDT	Severe Thunderstorm Watch	SPC	Kent, New Castle, Sussex	7 hr
Jun 24, 1:05 PM EDT	Mesoscale Discussion	SPC	Anne Arundel, Calvert, Charles, Dorchester, Frederick, Howard and 6 more	2 hr
Jun 24, 2:25 PM EDT	Severe Thunderstorm Watch	SPC	Calvert, Dorchester, Saint Mary's, Somerset, Wicomico, Worcester	4 hr
Jun 24, 11:42 AM EDT	Mesoscale Discussion	SPC	Bergen, Burlington, Camden, Essex, Gloucester, Hudson and 11 more	3 hr
Jun 24, 2:49 PM EDT	Severe Thunderstorm Watch	SPC	Cherokee, Clay	7 hr
Jun 24, 4:42 PM EDT	Mesoscale Discussion	SPC	Cherokee, Clay, Graham, Jackson, Macon	93 min

Nearby

Mesoscale Discussions in Virginia, 2011 Mesoscale Discussions in New Jersey, 2011 Mesoscale Discussions in North Carolina, 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.