Alert archive / Arkansas / Mesoscale Discussions in 2013

Mesoscale Discussion 81

January 29, 20135 states

The Storm Prediction Center issued this mesoscale discussion at Jan 29, 2013, 8:11 PM CST for 5 states. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jan 29, 2013, 8:11 PM CST (02:11 UTC)
Expired: Jan 29, 2013, 9:45 PM CST
In force: 94 min
Issued by: the Storm Prediction Center

All 75 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Greene County, AR, Hempstead County, AR, Hot Spring County, AR, Independence County, AR, Jackson County, AR, Jefferson County, AR, Lafayette County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Miller County, AR, Mississippi County, AR, Monroe County, AR, Nevada County, AR, Ouachita County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, St. Francis County, AR, Union County, AR, White County, AR, Woodruff County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Dunklin County, MO, Bolivar County, MS, Coahoma County, MS, Issaquena County, MS, Sharkey County, MS, Sunflower County, MS, Tunica County, MS, Washington County, MS, Harrison County, TX, Panola County, TX, Shelby County, TX

The radar

The Little Rock radar (KLZK), 83 km from the middle of the area, began a volume at 02:11 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 13Jan 29, 10:10 PM CST

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 2.2 hours before the alert went out and 208 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: 784 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 571 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 508 m²/s²
0-3 km storm-relative helicity: 586 m²/s²
Significant tornado parameter: 3.0
Supercell composite: 11.5

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
Jan 29, 9:49 PM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Chicot, Crittenden, Cross, Desha and 6 more	116 min
Jan 29, 7:31 PM CST	Mesoscale Discussion	SPC	Madison, Tensas	119 min
Jan 30, 3:03 AM CST	Mesoscale Discussion	SPC	Concordia, Tensas	57 min
Jan 30, 4:27 AM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 17 more	93 min
Jan 29, 10:07 PM CST	Tornado Watch	SPC	Adams, Alcorn, Attala, Benton, Calhoun, Carroll and 37 more	6 hr
Jan 30, 3:45 AM CST	Tornado Watch	SPC	Attala, Choctaw, Clarke, Clay, Copiah, Covington and 23 more	4 hr
Jan 30, 5:01 AM CST	Mesoscale Discussion	SPC	George, Greene, Perry, Stone	29 min
Jan 30, 5:15 AM CST	Tornado Watch	SPC	George, Greene, Perry, Stone, Wayne	7 hr
Jan 30, 7:43 AM CST	Mesoscale Discussion	SPC	Clarke, Forrest, George, Greene, Perry, Stone and 1 more	62 min
Jan 29, 6:08 PM CST	Mesoscale Discussion	SPC	Bollinger, Butler, Cape Girardeau, Madison, Mississippi, New Madrid and 5 more	2 hr
Jan 29, 7:13 PM CST	Tornado Watch	SPC	Bollinger, Butler, Cape Girardeau, Carter, Madison, Mississippi and 8 more	6 hr
Jan 29, 8:29 PM CST	Mesoscale Discussion	SPC	Atchison	4 hr
Jan 29, 9:19 PM CST	Mesoscale Discussion	SPC	Bollinger, Butler, Cape Girardeau, Madison, Mississippi, New Madrid and 5 more	86 min

Nearby

Mesoscale Discussions in Arkansas, 2013 Mesoscale Discussions in Louisiana, 2013 Mesoscale Discussions in Mississippi, 2013 Every mesoscale discussion in 2013

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.