Alert archive / Virginia / Mesoscale Discussions in 2011

Mesoscale Discussion 361

April 5, 20116 states

The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2011, 3:34 AM EDT for 6 states. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued
Apr 5, 2011, 3:34 AM EDT (07:34 UTC)
Expired
Apr 5, 2011, 5:30 AM EDT
In force
116 min
Issued by
the Storm Prediction Center
All 173 counties

Kent County, DE, New Castle County, DE, Sussex County, DE, Burke County, GA, 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, Wicomico County, MD, Worcester County, MD, Alamance County, NC, Beaufort County, NC, Bertie County, NC, Bladen County, NC, Brunswick County, NC, Camden County, NC, Carteret County, NC, Caswell County, NC, Chatham County, NC, Chowan County, NC, Columbus County, NC, Craven County, NC, Cumberland County, NC, Currituck County, NC, Dare County, NC, Duplin County, NC, Durham County, NC, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Granville County, NC, Greene County, NC, Halifax County, NC, Harnett County, NC, Hertford County, NC, Hoke County, NC, Hyde County, NC, Johnston County, NC, Jones County, NC, Lee County, NC, Lenoir County, NC, Martin County, NC, Moore County, NC, Nash County, NC, New Hanover County, NC, Northampton County, NC, Onslow County, NC, Orange County, NC, Pamlico County, NC, Pasquotank County, NC, Pender County, NC, Perquimans County, NC, Person County, NC, Pitt County, NC, Richmond County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Tyrrell County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, Aiken County, SC, Bamberg County, SC, Barnwell County, SC, Calhoun County, SC, Chesterfield County, SC, Clarendon County, SC, Darlington County, SC, Dillon County, SC, Florence County, SC, Georgetown County, SC, Horry County, SC, Kershaw County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Marlboro County, SC, Orangeburg County, SC, Richland County, SC, Sumter County, SC, Williamsburg County, SC, Accomack County, VA, Albemarle County, VA, Amelia County, VA, Arlington County, VA, Brunswick County, VA, Buckingham County, VA, Caroline County, VA, Charles City County, VA, Charlotte County, VA, Chesterfield County, VA, City of Alexandria, VA, City of Charlottesville, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Emporia, VA, City of Fairfax, VA, City of Falls Church, VA, City of Franklin, VA, City of Fredericksburg, VA, City of Hampton, VA, City of Hopewell, VA, City of Manassas, VA, City of Manassas Park, VA, City of Newport News, VA, City of Norfolk, VA, City of Petersburg, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Richmond, VA, City of Suffolk, VA, City of Virginia Beach, VA, City of Williamsburg, VA, Culpeper County, VA, Cumberland County, VA, Dinwiddie County, VA, Essex County, VA, Fairfax County, VA, Fauquier County, VA, Fluvanna County, VA, Gloucester County, VA, Goochland County, VA, Greensville County, VA, Halifax County, VA, Hanover County, VA, Henrico County, VA, Isle of Wight County, VA, James City County, VA, King and Queen County, VA, King George County, VA, King William County, VA, Lancaster County, VA, Louisa County, VA, Lunenburg County, VA, Mathews County, VA, Mecklenburg County, VA, Middlesex County, VA, New Kent County, VA, Northampton County, VA, Northumberland County, VA, Nottoway County, VA, Orange County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Prince William County, VA, Richmond County, VA, Southampton County, VA, Spotsylvania County, VA, Stafford County, VA, Surry County, VA, Sussex County, VA, Westmoreland County, VA, York County, VA

The radar

The Raleigh/Durham radar (KRAX), 88 km from the middle of the area, began a volume at 07:34 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Newport, NC (KMHX), launched 00:00Z, 7.6 hours before the alert went out and 134 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-pSkew-T log-p diagram, Newport, NC at 00:00Z on 2011-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 331 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Newport, NC at 00:00Z on 2011-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 190 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
331 J/kg
Mixed-layer CIN
-43 J/kg
Mixed-layer LCL
486 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
190 m²/s²
0-3 km storm-relative helicity
229 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.

IssuedProductOfficeCountiesLasted
Apr 5, 2:13 AM EDTMesoscale DiscussionSPCKent, Sussex32 min
Apr 5, 2:18 AM EDTTornado WatchSPCKent, New Castle, Sussex8 hr
Apr 4, 9:18 PM EDTMesoscale DiscussionSPCBartow, Carroll, Cherokee, Cobb, DeKalb, Douglas and 6 more87 min
Apr 4, 9:45 PM EDTSevere Thunderstorm WatchSPCElbert, Franklin, Habersham, Hart, Rabun, Stephens5 hr
Apr 4, 10:05 PM EDTMesoscale DiscussionSPCBaker, Baldwin, Ben Hill, Bibb, Bleckley, Butts and 61 more55 min
Apr 4, 10:28 PM EDTTornado WatchSPCBaker, Baldwin, Ben Hill, Bibb, Bleckley, Butts and 73 more6 hr
Apr 5, 12:21 AM EDTMesoscale DiscussionSPCBaker, Baldwin, Bibb, Bleckley, Butts, Calhoun and 62 more84 min
Apr 5, 12:48 AM EDTTornado WatchSPCBurke, Columbia, Lincoln, McDuffie, Richmond5 hr
Apr 5, 2:41 AM EDTTornado WatchSPCAppling, Atkinson, Bacon, Berrien, Brantley, Brooks and 25 more6 hr
Apr 5, 2:55 AM EDTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Ben Hill, Berrien, Bleckley and 55 more2 hr
Apr 5, 5:39 AM EDTMesoscale DiscussionSPCBrantley, Camden, Charlton, Chatham, Glynn, Liberty and 1 more2 hr
Apr 5, 5:07 AM EDTSevere Thunderstorm WatchSPCCecil2 hr
Apr 4, 9:32 PM EDTMesoscale DiscussionSPCAlexander, Buncombe, Burke, Catawba, Cleveland, Gaston and 8 more58 min
Apr 5, 12:36 AM EDTSevere Thunderstorm WatchSPCAlleghany, Caswell, Rockingham, Stokes, Surry, Wilkes and 1 more111 min
Apr 5, 2:24 AM EDTMesoscale DiscussionSPCCabarrus, Mecklenburg, Rowan66 min
Apr 5, 4:00 AM EDTTornado WatchSPCBeaufort, Bladen, Brunswick, Carteret, Columbus, Craven and 15 more6 hr
Apr 5, 7:08 AM EDTMesoscale DiscussionSPCBeaufort, Brunswick, Carteret, Craven, Currituck, Dare and 10 more2 hr
Apr 5, 10:15 AM EDTMesoscale DiscussionSPCBeaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 26 more90 min

Nearby

Mesoscale Discussions in Virginia, 2011Mesoscale Discussions in North Carolina, 2011Mesoscale Discussions in Maryland, 2011Every 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.