Alert archive / Mississippi / Mesoscale Discussions in 2005

Mesoscale Discussion 196

February 21, 20056 counties in Arkansas; 13 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 21, 2005, 3:58 PM CST for 6 counties in Arkansas; 13 counties in Mississippi. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Feb 21, 2005, 3:58 PM CST (21:58 UTC)
Expired: Feb 21, 2005, 5:30 PM CST
In force: 92 min
Issued by: the Storm Prediction Center

Counties Arkansas County, AR, Desha County, AR, Drew County, AR, Jefferson County, AR, Lincoln County, AR, Phillips County, AR, Bolivar County, MS, Coahoma County, MS, Grenada County, MS, Lafayette County, MS, Leflore County, MS, Montgomery County, MS, Panola County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Yalobusha County, MS

The radar

The Memphis radar (KNQA), 141 km from the middle of the area, began a volume at 21:58 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

Little Rock, AR (KLZK), launched 12:00Z, 10.0 hours before the alert went out and 88 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: 1442 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 572 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 2.8

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 20, 8:51 PM CST	Mesoscale Discussion	SPC	Baxter, Boone, Carroll, Cleburne, Conway, Crawford and 27 more	114 min
Feb 20, 9:10 PM CST	Severe Thunderstorm Watch	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 29 more	6 hr
Feb 20, 11:22 PM CST	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Clay, Cleburne and 42 more	113 min
Feb 21, 12:30 AM CST	Severe Thunderstorm Watch	SPC	Clay, Craighead, Crittenden, Cross, Greene, Jackson and 8 more	6 hr
Feb 21, 2:10 AM CST	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Clay, Cleburne and 43 more	95 min
Feb 21, 2:30 AM CST	Severe Thunderstorm Watch	SPC	Baxter, Boone, Cleburne, Conway, Fulton, Independence and 11 more	4 hr
Feb 21, 4:29 AM CST	Mesoscale Discussion	SPC	Baxter, Boone, Clay, Cleburne, Conway, Craighead and 16 more	2 hr
Feb 21, 5:45 AM CST	Severe Thunderstorm Watch	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more	3 hr
Feb 21, 7:50 AM CST	Mesoscale Discussion	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more	55 min
Feb 21, 12:17 PM CST	Mesoscale Discussion	SPC	Alcorn, Itawamba, Prentiss, Tippah, Tishomingo	118 min
Feb 21, 3:47 PM CST	Mesoscale Discussion	SPC	Calhoun, Chickasaw, Clay, Itawamba, Lafayette, Lee and 6 more	118 min

Nearby

Mesoscale Discussions in Mississippi, 2005 Mesoscale Discussions in Arkansas, 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.