Alert archive / Arkansas / Mesoscale Discussions in 2005

Mesoscale Discussion 341

March 22, 200526 counties in Arkansas; 17 counties in Mississippi; Shelby County, Tennessee

The Storm Prediction Center issued this mesoscale discussion at Mar 22, 2005, 11:55 AM CST for 26 counties in Arkansas; 17 counties in Mississippi; Shelby County, Tennessee. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Mar 22, 2005, 11:55 AM CST (17:55 UTC)
Expired: Mar 22, 2005, 1:30 PM CST
In force: 95 min
Issued by: the Storm Prediction Center

All 44 counties

Arkansas County, AR, Chicot County, AR, Cleburne County, AR, Conway County, AR, Crittenden County, AR, Cross County, AR, Desha County, AR, Faulkner County, AR, Jackson County, AR, Jefferson County, AR, Johnson County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Monroe County, AR, Newton County, AR, Perry County, AR, Phillips County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, St. Francis County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Benton County, MS, Bolivar County, MS, Carroll County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Lafayette County, MS, Leflore County, MS, Marshall County, MS, Panola County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Washington County, MS, Yalobusha County, MS, Shelby County, TN

The radar

The Little Rock radar (KLZK), 127 km from the middle of the area, began a volume at 17:57 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 68Mar 22, 12:55 PM CST

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 5.9 hours before the alert went out and 139 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: 6 J/kg
Mixed-layer CIN: -170 J/kg
Mixed-layer LCL: 770 m above ground
0-6 km bulk shear: 0 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 0 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 21, 8:29 PM CST	Mesoscale Discussion	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 11 more	91 min
Mar 21, 9:20 PM CST	Tornado Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 11 more	7 hr
Mar 21, 10:12 PM CST	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Crawford, Franklin, Johnson and 8 more	63 min
Mar 21, 10:15 PM CST	Severe Thunderstorm Watch	SPC	Benton, Carroll, Crawford, Franklin, Logan, Madison and 5 more	6 hr
Mar 21, 11:09 PM CST	Mesoscale Discussion	SPC	Hempstead, Howard, Lafayette, Little River, Miller, Pike and 1 more	96 min
Mar 21, 11:26 PM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 10 more	94 min
Mar 22, 1:45 AM CST	Tornado Watch	SPC	Ashley, Bradley, Chicot, Union	6 hr
Mar 22, 2:20 AM CST	Mesoscale Discussion	SPC	Benton, Carroll, Crawford, Franklin, Logan, Madison and 5 more	85 min
Mar 22, 3:57 AM CST	Mesoscale Discussion	SPC	Ashley, Bradley, Chicot, Union	2 hr
Mar 22, 12:55 PM CST	Severe Thunderstorm Watch	SPC	Arkansas, Baxter, Boone, Chicot, Clay, Cleburne and 29 more	7 hr
Mar 22, 2:39 PM CST	Mesoscale Discussion	SPC	Baxter, Cleburne, Craighead, Crittenden, Cross, Faulkner and 19 more	96 min
Mar 22, 4:27 PM CST	Mesoscale Discussion	SPC	Clay, Mississippi	33 min
Mar 22, 3:00 AM CST	Tornado Watch	SPC	Wilkinson	5 hr
Mar 22, 5:59 AM CST	Mesoscale Discussion	SPC	Adams, Amite, Attala, Carroll, Claiborne, Copiah and 8 more	2 hr
Mar 22, 6:55 AM CST	Tornado Watch	SPC	Clarke, Covington, Forrest, George, Greene, Hancock and 19 more	6 hr
Mar 22, 9:44 AM CST	Mesoscale Discussion	SPC	George, Greene, Hancock, Harrison, Jackson	61 min
Mar 22, 3:43 PM CST	Mesoscale Discussion	SPC	Amite, Attala, Clarke, Covington, Forrest, Greene and 23 more	2 hr
Mar 22, 4:50 PM CST	Severe Thunderstorm Watch	SPC	Alcorn, Benton, Itawamba, Lee, Pontotoc, Prentiss and 3 more	5 hr

Nearby

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