Alert archive / Mississippi / Mesoscale Discussions in 2003

Mesoscale Discussion 1954

July 22, 20038 counties in Mississippi; 6 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Jul 22, 2003, 6:29 AM CDT for 8 counties in Mississippi; 6 counties in Tennessee. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Jul 22, 2003, 6:29 AM CDT (11:29 UTC)
Expired: Jul 22, 2003, 8:00 AM CDT
In force: 91 min
Issued by: the Storm Prediction Center

Counties Alcorn County, MS, Benton County, MS, DeSoto County, MS, Marshall County, MS, Prentiss 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, Shelby County, TN

The watches that followed

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

Severe Thunderstorm Watch 797Jul 22, 6:40 AM CDT

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 11.5 hours before the alert went out and 93 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: 3035 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 1538 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 227 m²/s²
Significant tornado parameter: 0.3
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
Jul 22, 2:49 AM CDT	Mesoscale Discussion	SPC	Coahoma, DeSoto, Quitman, Tunica	116 min
Jul 22, 3:45 AM CDT	Severe Thunderstorm Watch	SPC	Calhoun, Chickasaw, Coahoma, DeSoto, Lafayette, Marshall and 6 more	5 hr
Jul 22, 4:47 AM CDT	Mesoscale Discussion	SPC	Coahoma, Quitman, Tate, Tunica	118 min
Jul 22, 6:40 AM CDT	Severe Thunderstorm Watch	SPC	Alcorn, Benton, Itawamba, Lee, Pontotoc, Prentiss and 3 more	3 hr
Jul 22, 1:42 PM CDT	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Copiah, Covington, Forrest and 18 more	2 hr
Jul 22, 2:30 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Amite, Claiborne, Clarke, Copiah, Covington and 29 more	6 hr
Jul 22, 2:40 PM CDT	Severe Thunderstorm Watch	SPC	George, Greene, Jackson, Wayne	5 hr
Jul 22, 6:21 PM CDT	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Copiah, Covington, Forrest and 24 more	54 min

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.