Alert archive / West Virginia / Mesoscale Discussions in 2008

Mesoscale Discussion 477

March 19, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Mar 19, 2008, 7:19 PM EDT for 4 states. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Mar 19, 2008, 7:19 PM EDT (23:19 UTC)
Expired: Mar 19, 2008, 8:45 PM EDT
In force: 86 min
Issued by: the Storm Prediction Center

All 47 counties

Cherokee County, NC, Clay County, NC, Graham County, NC, Haywood County, NC, Jackson County, NC, Macon County, NC, Madison County, NC, Swain County, NC, Blount County, TN, Carter County, TN, Cocke County, TN, Greene County, TN, Hamblen County, TN, Hawkins County, TN, Jefferson County, TN, Johnson County, TN, Monroe County, TN, Polk County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Washington County, TN, Bland County, VA, Buchanan County, VA, City of Bristol, VA, Dickenson County, VA, Giles County, VA, Russell County, VA, Scott County, VA, Smyth County, VA, Tazewell County, VA, Washington County, VA, Boone County, WV, Clay County, WV, Fayette County, WV, Greenbrier County, WV, Kanawha County, WV, Lincoln County, WV, Logan County, WV, McDowell County, WV, Mercer County, WV, Mingo County, WV, Monroe County, WV, Nicholas County, WV, Raleigh County, WV, Summers County, WV, Wyoming County, WV

The radar

The Knoxville radar (KMRX), 114 km from the middle of the area, began a volume at 23:19 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, 11.3 hours before the alert went out and 260 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 689 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 407 m²/s²
0-3 km storm-relative helicity: 499 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.

Issued	Product	Office	Counties	Lasted
Mar 19, 4:54 PM EDT	Mesoscale Discussion	SPC	Cherokee, Graham	66 min
Mar 19, 5:43 PM EDT	Severe Thunderstorm Watch	SPC	Cherokee, Clay, Graham, Haywood, Jackson, Macon and 2 more	4 hr
Mar 18, 9:43 PM EDT	Mesoscale Discussion	SPC	Carroll, Crockett, Dyer, Gibson, Haywood, Henry and 8 more	92 min
Mar 18, 11:51 PM EDT	Tornado Watch	SPC	Chester, Decatur, Hardeman, Hardin, Henderson, McNairy	8 hr
Mar 19, 12:42 AM EDT	Mesoscale Discussion	SPC	Carroll, Crockett, Fayette, Gibson, Hardeman, Haywood and 6 more	63 min
Mar 19, 2:13 AM EDT	Mesoscale Discussion	SPC	Benton, Carroll, Cheatham, Chester, Davidson, Decatur and 17 more	62 min
Mar 19, 5:55 AM EDT	Mesoscale Discussion	SPC	Giles	2 hr
Mar 19, 8:08 AM EDT	Mesoscale Discussion	SPC	Bedford, Franklin, Giles, Hardin, Lawrence, Lewis and 7 more	2 hr
Mar 19, 2:32 PM EDT	Mesoscale Discussion	SPC	Anderson, Bledsoe, Bradley, Campbell, Claiborne, Coffee and 24 more	58 min
Mar 19, 3:03 PM EDT	Tornado Watch	SPC	Anderson, Bedford, Bledsoe, Bradley, Campbell, Cannon and 27 more	5 hr

Nearby

Mesoscale Discussions in West Virginia, 2008 Mesoscale Discussions in Tennessee, 2008 Mesoscale Discussions in Virginia, 2008 Every mesoscale discussion in 2008

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.