Alert archive / Mississippi / Mesoscale Discussions in 2008

Mesoscale Discussion 937

May 15, 20084 states

The Storm Prediction Center issued this mesoscale discussion at May 15, 2008, 8:42 AM CDT for 4 states. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: May 15, 2008, 8:42 AM CDT (13:42 UTC)
Expired: May 15, 2008, 9:45 AM CDT
In force: 63 min
Issued by: the Storm Prediction Center

All 70 counties

Baldwin County, AL, Choctaw County, AL, Clarke County, AL, Escambia County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Sumter County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Pointe Coupee Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Hinds County, MS, Jackson County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Newton County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Warren County, MS, Wayne County, MS, Wilkinson County, MS

The watches that followed

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

Tornado Watch 326May 15, 9:00 AM CDT

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 1.7 hours before the alert went out and 50 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: 1782 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 501 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 197 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 8.4

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 15, 7:41 AM CDT	Mesoscale Discussion	SPC	Baldwin, Choctaw, Clarke, Escambia, Marengo, Mobile and 4 more	94 min
May 15, 8:58 AM CDT	Tornado Watch	SPC	Baldwin, Butler, Choctaw, Clarke, Coffee, Conecuh and 11 more	6 hr
May 15, 12:28 PM CDT	Mesoscale Discussion	SPC	Baldwin, Choctaw, Clarke, Coffee, Conecuh, Covington and 8 more	92 min
May 15, 1:16 AM CDT	Tornado Watch	SPC	Beauregard, Bienville, Bossier, Caddo, Caldwell, Claiborne and 14 more	6 hr
May 15, 2:11 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 11 more	94 min
May 15, 4:16 AM CDT	Tornado Watch	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 38 more	7 hr
May 15, 5:54 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 29 more	96 min

Nearby

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