Alert archive / Arkansas / Mesoscale Discussions in 2020

Mesoscale Discussion 8

January 10, 20204 states

The Storm Prediction Center issued this mesoscale discussion at Jan 10, 2020, 4:53 AM CST for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jan 10, 2020, 4:53 AM CST (10:53 UTC)
Expired: Jan 10, 2020, 7:00 AM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 49 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Cleveland County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Jefferson County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Monroe County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Union Parish, LA, West Carroll Parish, LA, Bolivar County, MS, Coahoma County, MS, DeSoto County, MS, Humphreys County, MS, Issaquena County, MS, Leflore County, MS, Panola County, MS, Quitman County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Warren County, MS, Washington County, MS, Shelby County, TN

The radar

The Little Rock radar (KLZK), 110 km from the middle of the area, began a volume at 10:52 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

Little Rock, AR (KLZK), launched 00:00Z, 10.9 hours before the alert went out and 153 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 694 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 507 m²/s²
0-3 km storm-relative helicity: 471 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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
Jan 10, 10:42 AM CST	Tornado Watch	SPC	Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more	10 hr
Jan 10, 1:44 PM CST	Mesoscale Discussion	SPC	Benton, Crawford, Washington	91 min
Jan 10, 4:55 PM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 61 more	2 hr
Jan 10, 5:34 PM CST	Tornado Watch	SPC	Arkansas, Baxter, Boone, Bradley, Calhoun, Clark and 50 more	11 hr

Nearby

Mesoscale Discussions in Arkansas, 2020 Mesoscale Discussions in Mississippi, 2020 Mesoscale Discussions in Louisiana, 2020 Every mesoscale discussion in 2020

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.