Alert archive / South Carolina / Mesoscale Discussions in 2006

Mesoscale Discussion 608

April 21, 20064 states

The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2006, 7:22 PM EDT for 4 states. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Apr 21, 2006, 7:22 PM EDT (23:22 UTC)
Expired: Apr 21, 2006, 8:45 PM EDT
In force: 83 min
Issued by: the Storm Prediction Center

All 57 counties

Columbia County, GA, Elbert County, GA, Franklin County, GA, Hart County, GA, Lincoln County, GA, Madison County, GA, McDuffie County, GA, Oglethorpe County, GA, Richmond County, GA, Stephens County, GA, Taliaferro County, GA, Warren County, GA, Wilkes County, GA, Avery County, NC, Buncombe County, NC, Burke County, NC, Caldwell County, NC, Catawba County, NC, Cleveland County, NC, Gaston County, NC, Haywood County, NC, Henderson County, NC, Jackson County, NC, Lincoln County, NC, Madison County, NC, McDowell County, NC, Mitchell County, NC, Polk County, NC, Rutherford County, NC, Transylvania County, NC, Yancey County, NC, Abbeville County, SC, Aiken County, SC, Anderson County, SC, Barnwell County, SC, Calhoun County, SC, Cherokee County, SC, Chester County, SC, Edgefield County, SC, Fairfield County, SC, Greenville County, SC, Greenwood County, SC, Laurens County, SC, Lexington County, SC, McCormick County, SC, Newberry County, SC, Oconee County, SC, Orangeburg County, SC, Pickens County, SC, Richland County, SC, Saluda County, SC, Spartanburg County, SC, Union County, SC, York County, SC, Cocke County, TN, Greene County, TN, Unicoi County, TN

The radar

The Greer radar (KGSP), 66 km from the middle of the area, began a volume at 23:22 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.

Severe Thunderstorm Watch 235Apr 21, 9:25 PM EDT

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 11.4 hours before the alert went out and 231 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: 420 J/kg
Mixed-layer CIN: -195 J/kg
Mixed-layer LCL: 833 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 190 m²/s²
0-3 km storm-relative helicity: 268 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.6

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
Apr 20, 8:55 PM EDT	Mesoscale Discussion	SPC	Banks, Barrow, Bartow, Butts, Carroll, Catoosa and 49 more	2 hr
Apr 21, 3:15 AM EDT	Mesoscale Discussion	SPC	Catoosa, Chattooga, Dade, Murray, Walker, Whitfield	2 hr
Apr 21, 1:17 PM EDT	Mesoscale Discussion	SPC	Bartow, Carroll, Catoosa, Chattooga, Cherokee, Dade and 12 more	88 min
Apr 21, 4:33 PM EDT	Tornado Watch	SPC	Bartow, Catoosa, Chattooga, Cherokee, Dade, Dawson and 12 more	6 hr
Apr 21, 4:39 PM EDT	Mesoscale Discussion	SPC	Bartow, Butts, Carroll, Chattahoochee, Cherokee, Clay and 31 more	66 min
Apr 20, 10:31 PM EDT	Mesoscale Discussion	SPC	Benton, Carroll, Chester, Crockett, Decatur, Dickson and 22 more	89 min
Apr 20, 11:00 PM EDT	Severe Thunderstorm Watch	SPC	Benton, Carroll, Cheatham, Chester, Crockett, Davidson and 30 more	7 hr
Apr 21, 1:04 AM EDT	Mesoscale Discussion	SPC	Hardeman, Hardin, McNairy	116 min
Apr 21, 6:00 AM EDT	Mesoscale Discussion	SPC	Chester, Decatur, Fayette, Giles, Hardeman, Hardin and 5 more	60 min
Apr 21, 2:24 PM EDT	Severe Thunderstorm Watch	SPC	Franklin, Lincoln, Moore	8 hr

Nearby

Mesoscale Discussions in South Carolina, 2006 Mesoscale Discussions in North Carolina, 2006 Mesoscale Discussions in Georgia, 2006 Every 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.