Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 134

February 12, 20074 parishes in Louisiana; 7 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 12, 2007, 1:43 PM CST for 4 parishes in Louisiana; 7 counties in Texas. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Feb 12, 2007, 1:43 PM CST (19:43 UTC)
Expired: Feb 12, 2007, 2:45 PM CST
In force: 62 min
Issued by: the Storm Prediction Center

Counties Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Vernon Parish, LA, Chambers County, TX, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Newton County, TX, Orange County, TX, Tyler County, TX

The radar

The Lake Charles radar (KLCH), 64 km from the middle of the area, began a volume at 19:46 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 17Feb 12, 2:10 PM CST

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 7.7 hours before the alert went out and 66 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: 626 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 156 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 12, 11:15 AM CST	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more	8 hr
Feb 12, 2:13 PM CST	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 10 more	8 hr
Feb 12, 3:40 PM CST	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more	95 min
Feb 12, 10:19 AM CST	Mesoscale Discussion	SPC	Brazoria, Fort Bend, Galveston, Harris, Matagorda	86 min
Feb 12, 2:54 PM CST	Mesoscale Discussion	SPC	Childress, Collingsworth, Hardeman, Wheeler	2 hr

Nearby

Mesoscale Discussions in Texas, 2007 Mesoscale Discussions in Louisiana, 2007 Every mesoscale discussion in 2007

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.