Alert archive / Virginia / Mesoscale Discussions in 2016

Mesoscale Discussion 145

February 24, 20164 counties in Maryland; 15 counties in North Carolina; 90 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Feb 24, 2016, 1:18 PM EST for 4 counties in Maryland; 15 counties in North Carolina; 90 counties in Virginia. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
Feb 24, 2016, 1:18 PM EST (18:18 UTC)
Expired
Feb 24, 2016, 3:15 PM EST
In force
117 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 109 counties

Calvert County, MD, Charles County, MD, Prince George's County, MD, Saint Mary's County, MD, Alamance County, NC, Caswell County, NC, Durham County, NC, Franklin County, NC, Granville County, NC, Guilford County, NC, Halifax County, NC, Northampton County, NC, Orange County, NC, Person County, NC, Rockingham County, NC, Stokes County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Albemarle County, VA, Amelia County, VA, Amherst County, VA, Appomattox County, VA, Arlington County, VA, Bedford County, VA, Botetourt County, VA, Brunswick County, VA, Buckingham County, VA, Campbell County, VA, Caroline County, VA, Charles City County, VA, Charlotte County, VA, Chesterfield County, VA, City of Alexandria, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Colonial Heights, VA, City of Danville, 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 Lexington, VA, City of Lynchburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Martinsville, VA, City of Newport News, VA, City of Petersburg, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Richmond, VA, City of Roanoke, VA, City of Staunton, VA, City of Suffolk, VA, City of Waynesboro, 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, Franklin County, VA, Gloucester County, VA, Goochland County, VA, Greene County, VA, Greensville County, VA, Halifax County, VA, Hanover County, VA, Henrico County, VA, Henry 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, Madison County, VA, Mathews County, VA, Mecklenburg County, VA, Middlesex County, VA, Nelson County, VA, New Kent County, VA, Northumberland County, VA, Nottoway County, VA, Orange County, VA, Patrick County, VA, Pittsylvania County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Prince William County, VA, Rappahannock County, VA, Richmond County, VA, Rockbridge 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 Norfolk radar (KAKQ), 128 km from the middle of the area, began a volume at 18:17 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

Roanoke, VA (KRNK), launched 12:00Z, 6.3 hours before the alert went out and 100 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, Roanoke, VA at 12:00Z on 2016-02-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Roanoke, VA at 12:00Z on 2016-02-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 828 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
465 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
828 m²/s²
0-3 km storm-relative helicity
913 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

IssuedProductOfficeCountiesLasted
Feb 24, 1:46 PM ESTTornado WatchSPCDorchester, Somerset, Wicomico, Worcester9 hr
Feb 24, 3:06 PM ESTMesoscale DiscussionSPCAnne Arundel, Baltimore, Calvert, Caroline, Carroll, Cecil and 12 more54 min
Feb 24, 3:20 PM ESTTornado WatchSPCAnne Arundel, Baltimore, Calvert, Caroline, Carroll, Cecil and 11 more8 hr
Feb 24, 4:46 PM ESTMesoscale DiscussionSPCAnne Arundel, Baltimore, Calvert, Caroline, Charles, Dorchester and 11 more89 min
Feb 24, 6:40 PM ESTMesoscale DiscussionSPCCharles, Saint Mary's2 hr
Feb 24, 8:14 AM ESTMesoscale DiscussionSPCAvery, Buncombe, Cherokee, Clay, Graham, Haywood and 10 more2 hr
Feb 24, 10:46 AM ESTMesoscale DiscussionSPCAlamance, Alexander, Anson, Burke, Cabarrus, Caldwell and 36 more119 min
Feb 24, 11:16 AM ESTMesoscale DiscussionSPCBeaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 28 more89 min
Feb 24, 11:16 AM ESTTornado WatchSPCAlamance, Alexander, Anson, Bladen, Brunswick, Cabarrus and 52 more8 hr
Feb 24, 2:55 PM ESTMesoscale DiscussionSPCAlamance, Anson, Bladen, Brunswick, Caswell, Chatham and 28 more95 min
Feb 24, 6:50 PM ESTTornado WatchSPCBeaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 36 more4 hr

Nearby

Mesoscale Discussions in Virginia, 2016Mesoscale Discussions in North Carolina, 2016Mesoscale Discussions in Maryland, 2016Every 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.