Alert archive / Mississippi / Mesoscale Discussions in 2003

Mesoscale Discussion 570

April 24, 2003Ashley County, Chicot County, Drew County, Arkansas; 8 parishes in Louisiana; 41 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2003, 10:51 PM CDT for Ashley County, Chicot County, Drew County, Arkansas; 8 parishes in Louisiana; 41 counties in Mississippi. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Apr 24, 2003, 10:51 PM CDT (03:51 UTC)
Expired: Apr 25, 2003, 12:15 AM CDT
In force: 84 min
Issued by: the Storm Prediction Center

All 52 counties

Ashley County, AR, Chicot County, AR, Drew County, AR, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Adams County, MS, Attala County, MS, Carroll County, MS, Choctaw County, MS, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena 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, Leflore County, MS, Lincoln County, MS, Madison County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Wayne County, MS, Webster County, MS, Winston County, MS, Yazoo County, MS

The watches that followed

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

Tornado Watch 162Apr 24, 11:45 PM CDT

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 3.9 hours before the alert went out and 57 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: 1927 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 649 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 293 m²/s²
0-3 km storm-relative helicity: 370 m²/s²
Significant tornado parameter: 4.7
Supercell composite: 18.7

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
Apr 24, 7:50 PM CDT	Tornado Watch	SPC	Ashley, Chicot, Drew	4 hr
Apr 24, 9:03 PM CDT	Mesoscale Discussion	SPC	Arkansas, Baxter, Clay, Cleburne, Cleveland, Conway and 33 more	117 min
Apr 24, 11:45 PM CDT	Tornado Watch	SPC	Craighead, Crittenden, Cross, Greene, Lawrence, Lee and 4 more	5 hr
Apr 25, 1:15 AM CDT	Mesoscale Discussion	SPC	Crittenden, Mississippi	90 min
Apr 25, 3:05 AM CDT	Mesoscale Discussion	SPC	Mississippi	85 min
Apr 25, 2:40 PM CDT	Severe Thunderstorm Watch	SPC	Ascension, East Baton Rouge, East Feliciana, Iberville, Livingston, Saint Helena and 3 more	5 hr
Apr 25, 11:04 AM CDT	Mesoscale Discussion	SPC	Alcorn, Itawamba, Lee, Prentiss, Tishomingo	116 min
Apr 25, 12:59 PM CDT	Mesoscale Discussion	SPC	Clarke, Covington, Jasper, Jefferson Davis, Jones, Lamar and 5 more	2 hr
Apr 25, 5:40 PM CDT	Tornado Watch	SPC	Covington, Forrest, George, Greene, Jefferson Davis, Jones and 6 more	5 hr

Nearby

Mesoscale Discussions in Mississippi, 2003 Mesoscale Discussions in Louisiana, 2003 Mesoscale Discussions in Arkansas, 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.