Alert archive / Mississippi / Mesoscale Discussions in 2006

Mesoscale Discussion 596

April 21, 200614 counties in Mississippi; Hardeman County, Hardin County, McNairy County, Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2006, 12:04 AM CDT for 14 counties in Mississippi; Hardeman County, Hardin County, McNairy County, Tennessee. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Apr 21, 2006, 12:04 AM CDT (05:04 UTC)
Expired: Apr 21, 2006, 2:00 AM CDT
In force: 116 min
Issued by: the Storm Prediction Center

Counties Alcorn County, MS, Benton County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Tallahatchie County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Yalobusha County, MS, Hardeman County, TN, Hardin County, TN, McNairy County, TN

The radar

The Columbus AFB radar (KGWX), 102 km from the middle of the area, began a volume at 05:07 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 00:00Z, 5.1 hours before the alert went out and 89 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: 512 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 1181 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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
Apr 20, 7:35 PM CDT	Mesoscale Discussion	SPC	Attala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 26 more	85 min
Apr 20, 9:31 PM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Coahoma, DeSoto, Lafayette, Marshall and 5 more	89 min
Apr 20, 10:00 PM CDT	Severe Thunderstorm Watch	SPC	Alcorn, Benton, Bolivar, Coahoma, DeSoto, Lafayette and 15 more	7 hr
Apr 21, 2:15 AM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Bolivar, Calhoun, Coahoma, DeSoto and 19 more	2 hr
Apr 21, 5:00 AM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Calhoun, Chickasaw, DeSoto, Itawamba and 12 more	60 min
Apr 21, 9:51 AM CDT	Mesoscale Discussion	SPC	Adams, Amite, Attala, Claiborne, Copiah, Covington and 25 more	84 min
Apr 21, 10:16 AM CDT	Severe Thunderstorm Watch	SPC	Adams, Amite, Claiborne, Clarke, Copiah, Covington and 27 more	6 hr
Apr 21, 12:52 PM CDT	Mesoscale Discussion	SPC	Amite, Clarke, Copiah, Covington, Forrest, George and 26 more	83 min
Apr 21, 1:24 PM CDT	Severe Thunderstorm Watch	SPC	Clay, George, Greene, Harrison, Jackson, Lowndes and 6 more	8 hr
Apr 21, 12:17 PM CDT	Mesoscale Discussion	SPC	Anderson, Bledsoe, Blount, Bradley, Cumberland, Franklin and 16 more	88 min
Apr 21, 3:33 PM CDT	Tornado Watch	SPC	Anderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 17 more	6 hr
Apr 21, 6:22 PM CDT	Mesoscale Discussion	SPC	Cocke, Greene, Unicoi	83 min

Nearby

Mesoscale Discussions in Mississippi, 2006 Mesoscale Discussions in Tennessee, 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.