Alert archive / Texas / Mesoscale Discussions in 2009

Mesoscale Discussion 2106

October 13, 200913 counties in Arkansas; 7 parishes in Louisiana; 14 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 13, 2009, 12:19 PM CDT for 13 counties in Arkansas; 7 parishes in Louisiana; 14 counties in Texas. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Oct 13, 2009, 12:19 PM CDT (17:19 UTC)
Expired: Oct 13, 2009, 2:15 PM CDT
In force: 116 min
Issued by: the Storm Prediction Center

All 34 counties

Ashley County, AR, Bradley County, AR, Calhoun County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Drew County, AR, Hempstead County, AR, Lafayette County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Union County, AR, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Union Parish, LA, Webster Parish, LA, Bowie County, TX, Camp County, TX, Cass County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Panola County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 67 km from the middle of the area, began a volume at 17:22 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 nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 5.3 hours before the alert went out and 60 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: 567 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 476 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 126 m²/s²
0-3 km storm-relative helicity: 157 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.6

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
Oct 13, 2:55 PM CDT	Mesoscale Discussion	SPC	Castro, Deaf Smith, Hale, Lamb, Oldham, Potter and 2 more	95 min

Nearby

Mesoscale Discussions in Texas, 2009 Mesoscale Discussions in Arkansas, 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; radar from the NEXRAD Level II archive.