Alert archive / Texas / Mesoscale Discussions in 2009

Mesoscale Discussion 937

June 3, 20095 parishes in Louisiana; 25 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 3, 2009, 1:20 PM CDT for 5 parishes in Louisiana; 25 counties in Texas. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Jun 3, 2009, 1:20 PM CDT (18:20 UTC)
Expired: Jun 3, 2009, 2:15 PM CDT
In force: 55 min
Issued by: the Storm Prediction Center

All 30 counties

Bossier Parish, LA, Caddo Parish, LA, De Soto Parish, LA, Red River Parish, LA, Sabine Parish, LA, Angelina County, TX, Brazoria County, TX, Chambers County, TX, Cherokee County, TX, Galveston County, TX, Gregg County, TX, Hardin County, TX, Harris County, TX, Harrison County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Marion County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Panola County, TX, Polk County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 6.3 hours before the alert went out and 164 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: 1895 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 471 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 38 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
Jun 2, 7:54 PM CDT	Mesoscale Discussion	SPC	Borden, Brown, Burnet, Callahan, Coke, Coleman and 36 more	66 min
Jun 3, 2:34 AM CDT	Mesoscale Discussion	SPC	Clay, Grayson	2 hr
Jun 3, 6:26 AM CDT	Mesoscale Discussion	SPC	Bowie	2 hr

Nearby

Mesoscale Discussions in Texas, 2009 Mesoscale Discussions in Louisiana, 2009 Every mesoscale discussion in 2009

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.