Alert archive / Mississippi / Mesoscale Discussions in 2017

Mesoscale Discussion 241

March 1, 20174 states

The Storm Prediction Center issued this mesoscale discussion at Mar 1, 2017, 10:08 AM CST for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 1, 2017, 10:08 AM CST (16:08 UTC)
Expired: Mar 1, 2017, 12:15 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 98 counties

Blount County, AL, Calhoun County, AL, Cherokee County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Jackson County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Pickens County, AL, St. Clair County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Fannin County, GA, Floyd County, GA, Gilmer County, GA, Gordon County, GA, Murray County, GA, Pickens County, GA, Walker County, GA, Whitfield County, GA, Alcorn County, MS, Attala County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Coahoma County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Itawamba County, MS, Kemper County, MS, Lafayette County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Lowndes County, MS, Madison County, MS, Marshall County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS, Bedford County, TN, Bradley County, TN, Coffee County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Hardin County, TN, Lawrence County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, McNairy County, TN, Moore County, TN, Polk County, TN, Sequatchie County, TN, Wayne County, TN

The radar

The Columbus AFB radar (KGWX), 30 km from the middle of the area, began a volume at 16:10 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.

Tornado Watch 57Mar 1, 11:50 AM CST

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 4.1 hours before the alert went out and 144 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: 246 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 549 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 290 m²/s²
0-3 km storm-relative helicity: 372 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 1, 4:19 AM CST	Mesoscale Discussion	SPC	Lauderdale	56 min
Mar 1, 5:28 AM CST	Mesoscale Discussion	SPC	Lauderdale	2 hr
Mar 1, 11:48 AM CST	Tornado Watch	SPC	Blount, Calhoun, Cherokee, Colbert, Cullman, DeKalb and 20 more	6 hr
Mar 1, 2:11 PM CST	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Cullman, DeKalb, Etowah and 7 more	2 hr
Mar 1, 2:43 PM CST	Mesoscale Discussion	SPC	Autauga, Chambers, Chilton, Clay, Coosa, Elmore and 3 more	3 hr
Mar 1, 3:43 PM CST	Severe Thunderstorm Watch	SPC	Autauga, Bibb, Chambers, Chilton, Clay, Cleburne and 10 more	4 hr
Mar 1, 5:54 PM CST	Mesoscale Discussion	SPC	Autauga, Bibb, Chambers, Chilton, Choctaw, Clarke and 16 more	2 hr
Mar 1, 1:07 PM CST	Mesoscale Discussion	SPC	Rabun	113 min
Mar 1, 2:02 PM CST	Severe Thunderstorm Watch	SPC	Elbert, Franklin, Habersham, Hart, Rabun, Stephens	7 hr
Mar 1, 2:09 AM CST	Mesoscale Discussion	SPC	DeSoto, Tunica	2 hr
Mar 1, 1:32 PM CST	Mesoscale Discussion	SPC	Adams, Amite, Clarke, Copiah, Covington, Franklin and 14 more	2 hr
Feb 28, 7:46 PM CST	Mesoscale Discussion	SPC	Crockett, Dyer, Gibson, Henry, Lake, Lauderdale and 3 more	119 min
Feb 28, 8:29 PM CST	Tornado Watch	SPC	Carroll, Crockett, Dyer, Gibson, Haywood, Henry and 6 more	12 hr
Mar 1, 3:03 AM CST	Tornado Watch	SPC	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more	5 hr
Mar 1, 4:57 AM CST	Tornado Watch	SPC	Bedford, Cannon, Cheatham, Clay, Coffee, Cumberland and 32 more	5 hr
Mar 1, 6:47 AM CST	Severe Thunderstorm Watch	SPC	Anderson, Bledsoe, Blount, Campbell, Carter, Claiborne and 23 more	5 hr
Mar 1, 7:28 AM CST	Mesoscale Discussion	SPC	Anderson, Bedford, Bledsoe, Campbell, Cannon, Claiborne and 37 more	92 min

Nearby

Mesoscale Discussions in Mississippi, 2017 Mesoscale Discussions in Alabama, 2017 Mesoscale Discussions in Tennessee, 2017 Every mesoscale discussion in 2017

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.