Alert archive / Louisiana / Mesoscale Discussions in 2008

Mesoscale Discussion 246

February 16, 200810 parishes in Louisiana; 10 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 16, 2008, 7:18 PM CST for 10 parishes in Louisiana; 10 counties in Texas. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Feb 16, 2008, 7:18 PM CST (01:18 UTC)
Expired: Feb 16, 2008, 8:45 PM CST
In force: 87 min
Issued by: the Storm Prediction Center

Counties Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, De Soto Parish, LA, Jefferson Davis Parish, LA, Natchitoches Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Chambers County, TX, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Newton County, TX, Orange County, TX, Sabine County, TX, San Augustine County, TX, Tyler County, TX

The radar

The Lake Charles radar (KLCH), 66 km from the middle of the area, began a volume at 01:21 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.

Tornado Watch 59Feb 16, 8:25 PM CST

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 1.3 hours before the alert went out and 67 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: 188 J/kg
Mixed-layer CIN: -263 J/kg
Mixed-layer LCL: 634 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 354 m²/s²
0-3 km storm-relative helicity: 445 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.7

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
Feb 16, 8:25 PM CST	Tornado Watch	SPC	Acadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 4 more	6 hr
Feb 16, 10:41 PM CST	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 26 more	94 min
Feb 16, 11:30 PM CST	Severe Thunderstorm Watch	SPC	Ascension, Assumption, Avoyelles, Caldwell, Catahoula, Concordia and 25 more	6 hr
Feb 17, 1:33 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Cameron, Evangeline, Jefferson Davis, Rapides and 1 more	57 min
Feb 17, 2:13 AM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 19 more	32 min
Feb 17, 2:45 AM CST	Tornado Watch	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 19 more	5 hr
Feb 17, 7:13 AM CST	Mesoscale Discussion	SPC	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Tammany	62 min
Feb 16, 6:48 PM CST	Mesoscale Discussion	SPC	Aransas, Bee, Brooks, Cameron, Duval, Hidalgo and 11 more	57 min

Nearby

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; radar from the NEXRAD Level II archive.