Alert archive / North Carolina / Mesoscale Discussions in 2006

Mesoscale Discussion 656

April 25, 200630 counties in North Carolina; 8 counties in Tennessee; 24 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2006, 6:16 PM EDT for 30 counties in North Carolina; 8 counties in Tennessee; 24 counties in Virginia. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Apr 25, 2006, 6:16 PM EDT (22:16 UTC)
Expired
Apr 25, 2006, 7:45 PM EDT
In force
89 min
Issued by
the Storm Prediction Center
All 62 counties

Alexander County, NC, Alleghany County, NC, Ashe County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Caldwell County, NC, Caswell County, NC, Catawba County, NC, Davidson County, NC, Davie County, NC, Forsyth County, NC, Guilford County, NC, Haywood County, NC, Henderson County, NC, Iredell County, NC, Lincoln County, NC, Madison County, NC, McDowell County, NC, Mitchell County, NC, Rockingham County, NC, Rowan County, NC, Rutherford County, NC, Stokes County, NC, Surry County, NC, Swain County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Yancey County, NC, Carter County, TN, Cocke County, TN, Greene County, TN, Johnson County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Washington County, TN, Bedford County, VA, Campbell County, VA, Carroll County, VA, City of Bristol, VA, City of Danville, VA, City of Galax, VA, City of Lynchburg, VA, City of Martinsville, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Floyd County, VA, Franklin County, VA, Grayson County, VA, Halifax County, VA, Henry County, VA, Montgomery County, VA, Patrick County, VA, Pittsylvania County, VA, Pulaski County, VA, Roanoke County, VA, Smyth County, VA, Washington County, VA, Wythe County, VA

The radar

The Roanoke radar (KFCX), 88 km from the middle of the area, began a volume at 22:17 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 10.3 hours before the alert went out and 99 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, Greensboro/Hi Pt, NC at 12:00Z on 2006-04-25Temperature 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, Greensboro/Hi Pt, NC at 12:00Z on 2006-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 11 square meters per square second.193958Sfc1 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
1476 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
11 m²/s²
0-3 km storm-relative helicity
40 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 25, 7:04 PM EDTSevere Thunderstorm WatchSPCAlamance, Alexander, Alleghany, Ashe, Avery, Buncombe and 44 more5 hr
Apr 25, 11:42 AM EDTMesoscale DiscussionSPCAnderson, Campbell, Claiborne, Clay, Cumberland, Fentress and 17 more2 hr
Apr 25, 3:25 PM EDTMesoscale DiscussionSPCCampbell, Claiborne, Grainger, Hancock, Hawkins, Scott and 2 more2 hr
Apr 25, 4:11 PM EDTMesoscale DiscussionSPCLake, Obion64 min
Apr 25, 5:44 PM EDTSevere Thunderstorm WatchSPCCarroll, Chester, Crockett, Decatur, Dyer, Fayette and 14 more6 hr

Nearby

Mesoscale Discussions in North Carolina, 2006Mesoscale Discussions in Virginia, 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.