Alert archive / Georgia / Mesoscale Discussions in 2005

Mesoscale Discussion 191

February 21, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Feb 21, 2005, 10:52 AM CST for 4 states. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Feb 21, 2005, 10:52 AM CST (16:52 UTC)
Expired: Feb 21, 2005, 12:45 PM CST
In force: 113 min
Issued by: the Storm Prediction Center

All 46 counties

Blount County, AL, Cherokee County, AL, DeKalb County, AL, Etowah County, AL, Marshall County, AL, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Dade County, GA, Dawson County, GA, Fannin County, GA, Floyd County, GA, Gilmer County, GA, Gordon County, GA, Habersham County, GA, Lumpkin County, GA, Murray County, GA, Pickens County, GA, Polk County, GA, Rabun County, GA, Towns County, GA, Union County, GA, Walker County, GA, White County, GA, Whitfield County, GA, Cherokee County, NC, Clay County, NC, Graham County, NC, Haywood County, NC, Jackson County, NC, Macon County, NC, Swain County, NC, Transylvania County, NC, Blount County, TN, Bradley County, TN, Cocke County, TN, Grainger County, TN, Hamblen County, TN, Jefferson County, TN, Knox County, TN, Loudon County, TN, McMinn County, TN, Monroe County, TN, Polk County, TN, Sevier County, TN

The radar

The Northeast Alabama radar (KHTX), 127 km from the middle of the area, began a volume at 16:52 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 26Feb 21, 12:45 PM CST

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 4.9 hours before the alert went out and 183 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: 88 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 553 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 187 m²/s²
0-3 km storm-relative helicity: 177 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
Feb 21, 7:50 AM CST	Mesoscale Discussion	SPC	Lauderdale	55 min
Feb 21, 8:40 AM CST	Severe Thunderstorm Watch	SPC	Colbert, Cullman, DeKalb, Fayette, Franklin, Jackson and 8 more	5 hr
Feb 21, 12:17 PM CST	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 12 more	118 min
Feb 21, 12:45 PM CST	Severe Thunderstorm Watch	SPC	Blount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 17 more	5 hr
Feb 21, 3:47 PM CST	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Cleburne, Cullman, DeKalb and 14 more	118 min
Feb 21, 4:50 PM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Butler, Coffee, Conecuh, Covington and 8 more	55 min
Feb 21, 5:48 PM CST	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Clay, Cleburne, Cullman and 15 more	27 min
Feb 21, 12:30 AM CST	Severe Thunderstorm Watch	SPC	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more	6 hr
Feb 21, 2:10 AM CST	Mesoscale Discussion	SPC	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more	95 min
Feb 21, 3:00 AM CST	Severe Thunderstorm Watch	SPC	Bedford, Bledsoe, Cannon, Cheatham, Clay, Coffee and 29 more	6 hr
Feb 21, 4:29 AM CST	Mesoscale Discussion	SPC	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more	2 hr
Feb 21, 5:13 AM CST	Mesoscale Discussion	SPC	Bedford, Bledsoe, Cannon, Cheatham, Clay, Coffee and 30 more	2 hr
Feb 21, 5:45 AM CST	Severe Thunderstorm Watch	SPC	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more	3 hr

Nearby

Mesoscale Discussions in Georgia, 2005 Mesoscale Discussions in Tennessee, 2005 Mesoscale Discussions in North Carolina, 2005 Every mesoscale discussion in 2005

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.