Alert archive / Mississippi / Mesoscale Discussions in 2003

Mesoscale Discussion 1043

May 17, 200313 counties in Mississippi; 5 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at May 17, 2003, 5:42 AM CDT for 13 counties in Mississippi; 5 counties in Tennessee. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: May 17, 2003, 5:42 AM CDT (10:42 UTC)
Expired: May 17, 2003, 6:45 AM CDT
In force: 63 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, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Chester County, TN, Fayette County, TN, Hardeman County, TN, Hardin County, TN, McNairy County, TN

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 403May 17, 9:20 AM CDT

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 10.7 hours before the alert went out and 268 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: 625 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 946 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.3

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
May 16, 8:38 PM CDT	Mesoscale Discussion	SPC	Attala, Benton, Bolivar, Calhoun, Carroll, Choctaw and 37 more	97 min
May 16, 9:35 PM CDT	Tornado Watch	SPC	Alcorn, Attala, Benton, Bolivar, Calhoun, Carroll and 25 more	6 hr
May 16, 11:41 PM CDT	Mesoscale Discussion	SPC	Tishomingo	94 min
May 17, 12:55 AM CDT	Severe Thunderstorm Watch	SPC	Itawamba, Monroe, Prentiss, Tishomingo	4 hr
May 17, 1:54 AM CDT	Mesoscale Discussion	SPC	Attala, Calhoun, Carroll, Chickasaw, Choctaw, Grenada and 12 more	66 min
May 17, 2:37 AM CDT	Mesoscale Discussion	SPC	Monroe	53 min
May 17, 4:45 AM CDT	Tornado Watch	SPC	Attala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 20 more	5 hr
May 17, 6:37 AM CDT	Mesoscale Discussion	SPC	Attala, Calhoun, Carroll, Chickasaw, Choctaw, Claiborne and 18 more	83 min
May 17, 7:48 AM CDT	Mesoscale Discussion	SPC	Attala, Calhoun, Carroll, Chickasaw, Choctaw, Claiborne and 33 more	57 min
May 17, 9:20 AM CDT	Tornado Watch	SPC	Adams, Amite, Attala, Chickasaw, Choctaw, Claiborne and 42 more	6 hr
May 17, 1:50 PM CDT	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Clarke, Copiah, Covington and 29 more	115 min
May 17, 3:00 PM CDT	Tornado Watch	SPC	Adams, Amite, Claiborne, Clarke, Copiah, Covington and 28 more	5 hr
May 17, 6:04 PM CDT	Mesoscale Discussion	SPC	Amite, Clarke, Copiah, Covington, Forrest, Greene and 18 more	116 min
May 17, 11:50 AM CDT	Tornado Watch	SPC	Anderson, Bedford, Bledsoe, Blount, Bradley, Campbell and 41 more	5 hr
May 17, 1:14 PM CDT	Mesoscale Discussion	SPC	Anderson, Bledsoe, Blount, Bradley, Campbell, Cannon and 34 more	91 min
May 17, 4:40 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Blount, Bradley, Campbell, Carter, Claiborne and 19 more	4 hr

Nearby

Mesoscale Discussions in Mississippi, 2003 Mesoscale Discussions in Tennessee, 2003 Every mesoscale discussion in 2003

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.