Alert archive / Virginia / Mesoscale Discussions in 2006

Mesoscale Discussion 1503

July 13, 200621 counties in North Carolina; Johnson County, Tennessee; 53 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2006, 5:31 PM EDT for 21 counties in North Carolina; Johnson County, Tennessee; 53 counties in Virginia. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Jul 13, 2006, 5:31 PM EDT (21:31 UTC)
Expired
Jul 13, 2006, 7:00 PM EDT
In force
89 min
Issued by
the Storm Prediction Center
All 75 counties

Alleghany County, NC, Ashe County, NC, Avery County, NC, Camden County, NC, Caswell County, NC, Forsyth County, NC, Gates County, NC, Granville County, NC, Halifax County, NC, Hertford County, NC, Northampton County, NC, Pasquotank County, NC, Person County, NC, Rockingham County, NC, Stokes County, NC, Surry County, NC, Vance County, NC, Warren County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Johnson County, TN, Amelia County, VA, Appomattox County, VA, Bedford County, VA, Bland County, VA, Brunswick County, VA, Campbell County, VA, Carroll County, VA, Charlotte County, VA, Chesterfield County, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Danville, VA, City of Emporia, VA, City of Franklin, VA, City of Galax, VA, City of Hopewell, VA, City of Lynchburg, VA, City of Martinsville, VA, City of Newport News, VA, City of Petersburg, VA, City of Portsmouth, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, City of Suffolk, VA, Cumberland County, VA, Dinwiddie County, VA, Floyd County, VA, Franklin County, VA, Giles County, VA, Grayson County, VA, Greensville County, VA, Halifax County, VA, Henrico County, VA, Henry County, VA, Isle of Wight County, VA, Lunenburg County, VA, Mecklenburg County, VA, Montgomery County, VA, Nottoway County, VA, Patrick County, VA, Pittsylvania County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Pulaski County, VA, Roanoke County, VA, Smyth County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA, Washington County, VA, Wythe County, VA

The radar

The Roanoke radar (KFCX), 89 km from the middle of the area, began a volume at 21:31 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

Roanoke, VA (KRNK), launched 12:00Z, 9.5 hours before the alert went out and 46 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 2006-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 108 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, Roanoke, VA at 12:00Z on 2006-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 square meters per square second.1939Sfc1 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
108 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
1060 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
54 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
Jul 13, 11:18 AM EDTMesoscale DiscussionSPCAlleghany, Ashe, Avery, Caswell, Madison, Mitchell and 8 more117 min
Jul 13, 2:17 PM EDTSevere Thunderstorm WatchSPCAlleghany, Ashe, Bertie, Camden, Caswell, Chowan and 17 more7 hr

Nearby

Mesoscale Discussions in Virginia, 2006Mesoscale Discussions in North Carolina, 2006Mesoscale Discussions in Tennessee, 2006Every mesoscale discussion in 2006

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.