Alert archive / Virginia / Mesoscale Discussions in 2003

Mesoscale Discussion 2540

November 19, 200359 counties in Virginia; Pendleton County, Pocahontas County, West Virginia

The Storm Prediction Center issued this mesoscale discussion at Nov 19, 2003, 8:10 AM EST for 59 counties in Virginia; Pendleton County, Pocahontas County, West Virginia. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Nov 19, 2003, 8:10 AM EST (13:10 UTC)
Expired
Nov 19, 2003, 10:45 AM EST
In force
3 hr
Issued by
the Storm Prediction Center
All 61 counties

Albemarle County, VA, Alleghany County, VA, Amelia County, VA, Amherst County, VA, Appomattox County, VA, Arlington County, VA, Augusta County, VA, Bath County, VA, Bedford County, VA, Botetourt County, VA, Buckingham County, VA, Campbell County, VA, Caroline County, VA, Charlotte County, VA, City of Alexandria, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Covington, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Lynchburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Roanoke, VA, City of Salem, VA, City of Staunton, VA, City of Waynesboro, VA, Craig County, VA, Culpeper County, VA, Cumberland County, VA, Fairfax County, VA, Fauquier County, VA, Floyd County, VA, Fluvanna County, VA, Franklin County, VA, Goochland County, VA, Greene County, VA, Highland County, VA, Louisa County, VA, Lunenburg County, VA, Madison County, VA, Nelson County, VA, Orange County, VA, Page County, VA, Pittsylvania County, VA, Powhatan County, VA, Prince Edward County, VA, Prince William County, VA, Rappahannock County, VA, Roanoke County, VA, Rockbridge County, VA, Rockingham County, VA, Shenandoah County, VA, Spotsylvania County, VA, Stafford County, VA, Warren County, VA, Pendleton County, WV, Pocahontas County, WV

The radar

The Sterling radar (KLWX), 139 km from the middle of the area, began a volume at 13:09 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, 1.2 hours before the alert went out and 126 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 2003-11-19Temperature 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 2003-11-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 369 square meters per square second.1939587897117Sfc1 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
566 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
369 m²/s²
0-3 km storm-relative helicity
578 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
Nov 19, 6:31 AM ESTMesoscale DiscussionSPCCarroll, Grayson, Henry, Patrick, City of Danville, City of Galax and 1 more119 min
Nov 19, 8:50 AM ESTTornado WatchSPCAlbemarle, Alleghany, Amelia, Amherst, Appomattox, Arlington and 82 more6 hr
Nov 19, 10:57 AM ESTMesoscale DiscussionSPCAccomack, Charles City, Dinwiddie, Gloucester, Greensville, Henrico and 28 more93 min
Nov 19, 11:25 AM ESTTornado WatchSPCAccomack, Charles City, Essex, Gloucester, Isle of Wight, James City and 25 more6 hr
Nov 19, 11:29 AM ESTMesoscale DiscussionSPCBland, Buchanan, Dickenson, Grayson, Lee, Russell and 8 more61 min
Nov 19, 12:47 PM ESTMesoscale DiscussionSPCAmelia, Arlington, Brunswick, Caroline, Chesterfield, Clarke and 38 more118 min
Nov 19, 2:27 PM ESTMesoscale DiscussionSPCAccomack, Gloucester, Isle of Wight, James City, Lancaster, Mathews and 16 more93 min
Nov 19, 3:59 PM ESTMesoscale DiscussionSPCAccomack, Northampton, City of Norfolk, City of Virginia Beach61 min

Nearby

Mesoscale Discussions in Virginia, 2003Mesoscale Discussions in West Virginia, 2003Every mesoscale discussion in 2003

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.