Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 115

March 10, 2018Lafayette County, Miller County, Arkansas; Bossier Parish, Caddo Parish, Webster Parish, Louisiana; 15 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 10, 2018, 10:08 PM CST for Lafayette County, Miller County, Arkansas; Bossier Parish, Caddo Parish, Webster Parish, Louisiana; 15 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 10, 2018, 10:08 PM CST (04:08 UTC)
Expired: Mar 11, 2018, 12:15 AM CST
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Lafayette County, AR, Miller County, AR, Bossier Parish, LA, Caddo Parish, LA, Webster Parish, LA, Bowie County, TX, Camp County, TX, Cass County, TX, Delta County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Hopkins County, TX, Hunt County, TX, Marion County, TX, Morris County, TX, Rains County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 113 km from the middle of the area, began a volume at 04:10 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 (KBAD), launched 00:00Z, 4.1 hours before the alert went out and 119 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: 1026 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1265 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 236 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.3

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 10, 8:06 PM CST	Mesoscale Discussion	SPC	Arkansas, Chicot, Clark, Cleveland, Conway, Crawford and 27 more	114 min
Mar 10, 8:33 PM CST	Severe Thunderstorm Watch	SPC	Ashley, Chicot	7 hr
Mar 10, 10:44 PM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Chicot, Desha, Drew, Lincoln	91 min
Mar 11, 9:46 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 13 more	119 min

Nearby

Mesoscale Discussions in Texas, 2018 Mesoscale Discussions in Louisiana, 2018 Mesoscale Discussions in Arkansas, 2018 Every mesoscale discussion in 2018

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.