Alert archive / Mississippi / Mesoscale Discussions in 2008

Mesoscale Discussion 818

May 7, 20084 states

The Storm Prediction Center issued this mesoscale discussion at May 7, 2008, 11:49 PM CDT for 4 states. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: May 7, 2008, 11:49 PM CDT (04:49 UTC)
Expired: May 8, 2008, 1:45 AM CDT
In force: 116 min
Issued by: the Storm Prediction Center

All 66 counties

Ashley County, AR, Chicot County, AR, Avoyelles Parish, LA, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, Vernon Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lamar County, MS, Lawrence County, MS, Leake County, MS, Leflore County, MS, Lincoln County, MS, Madison County, MS, Marion County, MS, Newton County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Warren County, MS, Washington County, MS, Wilkinson County, MS, Yazoo County, MS, Angelina County, TX, Cherokee County, TX, Houston County, TX, Nacogdoches County, TX, Panola County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 4.8 hours before the alert went out and 225 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2287 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 219 m²/s²
0-3 km storm-relative helicity: 261 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
May 7, 9:35 PM CDT	Tornado Watch	SPC	Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 36 more	5 hr
May 7, 10:28 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 38 more	92 min
May 8, 7:48 AM CDT	Mesoscale Discussion	SPC	Attala, Calhoun, Carroll, Chickasaw, Choctaw, Clay and 21 more	87 min
May 8, 8:04 AM CDT	Tornado Watch	SPC	Alcorn, Attala, Calhoun, Carroll, Chickasaw, Choctaw and 22 more	6 hr
May 8, 10:07 AM CDT	Mesoscale Discussion	SPC	Alcorn, Attala, Calhoun, Carroll, Chickasaw, Choctaw and 23 more	83 min
May 8, 12:13 PM CDT	Mesoscale Discussion	SPC	Kemper, Lauderdale, Neshoba, Newton, Noxubee	92 min
May 8, 12:40 PM CDT	Tornado Watch	SPC	Clarke, Covington, Jasper, Jones, Kemper, Lauderdale and 6 more	5 hr
May 7, 8:21 PM CDT	Mesoscale Discussion	SPC	Brazos, Falls, Grimes, Leon, Madison, Milam and 2 more	54 min
May 8, 1:27 PM CDT	Mesoscale Discussion	SPC	Ochiltree	63 min

Nearby

Mesoscale Discussions in Mississippi, 2008 Mesoscale Discussions in Louisiana, 2008 Mesoscale Discussions in Texas, 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.