Alert archive / Mississippi / Mesoscale Discussions in 2008

Mesoscale Discussion 472

March 19, 200817 counties in Alabama; 18 counties in Mississippi; Giles County, Tennessee

The Storm Prediction Center issued this mesoscale discussion at Mar 19, 2008, 4:55 AM CDT for 17 counties in Alabama; 18 counties in Mississippi; Giles County, Tennessee. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 19, 2008, 4:55 AM CDT (09:55 UTC)
Expired: Mar 19, 2008, 7:00 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 36 counties

Blount County, AL, Colbert County, AL, Cullman County, AL, Fayette County, AL, Franklin 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, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Attala County, MS, Calhoun County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Itawamba County, MS, Leake County, MS, Lee County, MS, Lowndes County, MS, Monroe County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Pontotoc County, MS, Prentiss County, MS, Tishomingo County, MS, Webster County, MS, Winston County, MS, Giles County, TN

The radar

The Columbus AFB radar (KGWX), 31 km from the middle of the area, began a volume at 09:54 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

Jackson, MS (KJAN), launched 00:00Z, 9.9 hours before the alert went out and 259 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: 4 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 1138 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 301 m²/s²
0-3 km storm-relative helicity: 322 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 19, 7:08 AM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Bibb, Blount, Bullock, Butler and 54 more	2 hr
Mar 19, 1:32 PM CDT	Mesoscale Discussion	SPC	Jackson	58 min
Mar 18, 10:34 PM CDT	Mesoscale Discussion	SPC	Adams, Amite, Attala, Claiborne, Copiah, Covington and 25 more	56 min
Mar 18, 10:51 PM CDT	Tornado Watch	SPC	Adams, Alcorn, Amite, Attala, Benton, Bolivar and 65 more	8 hr
Mar 18, 11:42 PM CDT	Mesoscale Discussion	SPC	DeSoto	63 min
Mar 19, 2:35 AM CDT	Mesoscale Discussion	SPC	Attala, Calhoun, Carroll, Chickasaw, Choctaw, Clay and 18 more	115 min
Mar 18, 8:43 PM CDT	Mesoscale Discussion	SPC	Carroll, Crockett, Dyer, Gibson, Haywood, Henry and 8 more	92 min
Mar 19, 1:13 AM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Cheatham, Chester, Davidson, Decatur and 17 more	62 min
Mar 19, 2:03 PM CDT	Tornado Watch	SPC	Anderson, Bedford, Bledsoe, Bradley, Campbell, Cannon and 27 more	5 hr
Mar 19, 3:54 PM CDT	Mesoscale Discussion	SPC	Anderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 23 more	66 min
Mar 19, 4:43 PM CDT	Severe Thunderstorm Watch	SPC	Blount, Carter, Cocke, Greene, Hamblen, Hawkins and 8 more	4 hr
Mar 19, 6:19 PM CDT	Mesoscale Discussion	SPC	Blount, Carter, Cocke, Greene, Hamblen, Hawkins and 8 more	86 min

Nearby

Mesoscale Discussions in Mississippi, 2008 Mesoscale Discussions in Alabama, 2008 Mesoscale Discussions in Tennessee, 2008 Every mesoscale discussion in 2008

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.