Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 1210

July 1, 20174 counties in Arkansas; 17 parishes in Louisiana; 33 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jul 1, 2017, 11:33 AM CDT for 4 counties in Arkansas; 17 parishes in Louisiana; 33 counties in Texas. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Jul 1, 2017, 11:33 AM CDT (16:33 UTC)
Expired: Jul 1, 2017, 1:30 PM CDT
In force: 117 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 54 counties

Columbia County, AR, Lafayette County, AR, Miller County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Anderson County, TX, Angelina County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Ellis County, TX, Falls County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Houston County, TX, Kaufman County, TX, Leon County, TX, Limestone County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Navarro County, TX, Panola County, TX, Rains County, TX, Robertson County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 91 km from the middle of the area, began a volume at 16:34 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 12:00Z, 4.6 hours before the alert went out and 100 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: 291 J/kg
Mixed-layer CIN: -252 J/kg
Mixed-layer LCL: 957 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Jun 30, 7:51 PM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Briscoe, Carson, Castro, Childress and 30 more	114 min
Jun 30, 10:24 PM CDT	Mesoscale Discussion	SPC	Foard, Hardeman, Knox, Wichita, Wilbarger	66 min
Jun 30, 11:58 PM CDT	Mesoscale Discussion	SPC	Bailey, Castro, Cochran, Hale, Hockley, Lamb and 2 more	92 min
Jul 1, 2:34 AM CDT	Severe Thunderstorm Watch	SPC	Borden, Callahan, Coke, Coleman, Crosby, Dawson and 14 more	5 hr
Jul 1, 2:56 AM CDT	Mesoscale Discussion	SPC	Borden, Callahan, Coke, Coleman, Crosby, Dawson and 17 more	64 min
Jul 1, 5:25 AM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coke, Coleman, Comanche, Eastland and 6 more	2 hr
Jul 1, 4:32 PM CDT	Mesoscale Discussion	SPC	Bailey, Cochran	118 min

Nearby

Mesoscale Discussions in Texas, 2017 Mesoscale Discussions in Louisiana, 2017 Mesoscale Discussions in Arkansas, 2017 Every mesoscale discussion in 2017

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.