Alert archive / Mississippi / Mesoscale Discussions in 2007

Mesoscale Discussion 237

March 1, 20076 counties in Alabama; 49 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 1, 2007, 10:33 AM CST for 6 counties in Alabama; 49 counties in Mississippi. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Mar 1, 2007, 10:33 AM CST (16:33 UTC)
Expired: Mar 1, 2007, 12:30 PM CST
In force: 117 min
Issued by: the Storm Prediction Center

All 55 counties

Colbert County, AL, Franklin County, AL, Lamar County, AL, Lauderdale County, AL, Marion County, AL, Pickens County, AL, Amite County, MS, Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Clarke County, MS, Clay County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Itawamba County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lee County, MS, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pontotoc County, MS, Prentiss County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Tishomingo County, MS, Union County, MS, Warren County, MS, Webster County, MS, Winston County, MS, Yazoo County, MS

The radar

The Columbus AFB radar (KGWX), 91 km from the middle of the area, began a volume at 16:33 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 12:00Z, 4.6 hours before the alert went out and 151 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: 985 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 575 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 312 m²/s²
0-3 km storm-relative helicity: 400 m²/s²
Significant tornado parameter: 1.9
Supercell composite: 9.5

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 1, 12:12 AM CST	Mesoscale Discussion	SPC	Colbert, Franklin, Lauderdale	2 hr
Mar 1, 1:05 AM CST	Severe Thunderstorm Watch	SPC	Colbert, Franklin, Lauderdale	7 hr
Mar 1, 2:57 AM CST	Mesoscale Discussion	SPC	Autauga, Barbour, Bullock, Butler, Clarke, Coffee and 15 more	2 hr
Mar 1, 4:18 AM CST	Mesoscale Discussion	SPC	Colbert, Franklin, Lauderdale	117 min
Mar 1, 6:54 AM CST	Mesoscale Discussion	SPC	Bibb, Blount, Calhoun, Cherokee, Cleburne, Colbert and 24 more	66 min
Mar 1, 7:28 AM CST	Tornado Watch PDS	SPC	Baldwin, Bibb, Blount, Chilton, Choctaw, Clarke and 29 more	12 hr
Mar 1, 8:58 AM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Coffee, Covington, Crenshaw, Dale and 7 more	2 hr
Mar 1, 9:47 AM CST	Tornado Watch PDS	SPC	Autauga, Barbour, Bullock, Butler, Calhoun, Chambers and 26 more	10 hr
Mar 1, 11:39 AM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 35 more	2 hr
Mar 1, 1:40 PM CST	Mesoscale Discussion	SPC	Dale, Henry	65 min
Mar 1, 2:41 PM CST	Mesoscale Discussion	SPC	Autauga, Barbour, Bibb, Blount, Bullock, Butler and 43 more	94 min
Mar 1, 5:22 PM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Bibb, Blount, Bullock and 59 more	83 min
Mar 1, 5:23 AM CST	Mesoscale Discussion	SPC	Bolivar, Issaquena, Washington	97 min

Nearby

Mesoscale Discussions in Mississippi, 2007 Mesoscale Discussions in Alabama, 2007 Every mesoscale discussion in 2007

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.