Alert archive / Arkansas / Mesoscale Discussions in 2017

Mesoscale Discussion 1623

September 5, 201719 counties in Arkansas; 13 parishes in Louisiana; Bowie County, Cass County, Texas

The Storm Prediction Center issued this mesoscale discussion at Sep 5, 2017, 3:10 PM CDT for 19 counties in Arkansas; 13 parishes in Louisiana; Bowie County, Cass County, Texas. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Sep 5, 2017, 3:10 PM CDT (20:10 UTC)
Expired: Sep 5, 2017, 4:15 PM CDT
In force: 65 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 34 counties

Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Drew County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Sevier County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, East Carroll Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Bowie County, TX, Cass County, TX

The radar

The Shreveport radar (KSHV), 128 km from the middle of the area, began a volume at 20:13 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, 8.2 hours before the alert went out and 121 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: 384 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 1291 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 29 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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Nearby

Mesoscale Discussions in Arkansas, 2017 Mesoscale Discussions in Louisiana, 2017 Mesoscale Discussions in Texas, 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.