Alert archive / Louisiana / Mesoscale Discussions in 2008

Mesoscale Discussion 300

February 25, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Feb 25, 2008, 9:22 PM CST for 4 states. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Feb 25, 2008, 9:22 PM CST (03:22 UTC)
Expired: Feb 25, 2008, 10:45 PM CST
In force: 83 min
Issued by: the Storm Prediction Center

All 50 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Jefferson County, AR, Lafayette County, AR, Lincoln County, AR, Nevada County, AR, Ouachita County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Bolivar County, MS, Coahoma County, MS, Humphreys County, MS, Issaquena County, MS, Sharkey County, MS, Sunflower County, MS, Washington County, MS, Harrison County, TX, Nacogdoches County, TX, Panola County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX

The radar

The Shreveport radar (KSHV), 115 km from the middle of the area, began a volume at 03:26 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watches that followed

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

Severe Thunderstorm Watch 76Feb 26, 12:10 AM CST

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 3.4 hours before the alert went out and 106 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: 60 J/kg
Mixed-layer CIN: -384 J/kg
Mixed-layer LCL: 1105 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: 199 m²/s²
0-3 km storm-relative helicity: 199 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
Feb 25, 7:20 PM CST	Severe Thunderstorm Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 17 more	7 hr
Feb 25, 11:20 PM CST	Mesoscale Discussion	SPC	Ashley, Chicot	85 min
Feb 26, 12:10 AM CST	Severe Thunderstorm Watch	SPC	Caldwell, Catahoula, Concordia, Franklin, Grant, LaSalle and 4 more	7 hr
Feb 26, 2:50 AM CST	Mesoscale Discussion	SPC	Catahoula, Concordia, Franklin, Grant, LaSalle, Madison and 1 more	85 min
Feb 26, 5:12 AM CST	Severe Thunderstorm Watch	SPC	George, Greene, Perry, Stone	4 hr

Nearby

Mesoscale Discussions in Louisiana, 2008 Mesoscale Discussions in Arkansas, 2008 Mesoscale Discussions in Mississippi, 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; radar from the NEXRAD Level II archive.