Alert archive / Arkansas / Mesoscale Discussions in 2020

Mesoscale Discussion 23

January 10, 20204 states

The Storm Prediction Center issued this mesoscale discussion at Jan 10, 2020, 10:40 PM CST for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jan 10, 2020, 10:40 PM CST (04:40 UTC)
Expired
Jan 11, 2020, 12:45 AM CST
In force
2 hr
Issued by
the Storm Prediction Center
All 82 counties

Arkansas County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Clay County, AR, Cleburne County, AR, Cleveland County, AR, Columbia County, AR, Conway County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hempstead County, AR, Hot Spring County, AR, Independence County, AR, Izard 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, Perry County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Union County, AR, White County, AR, Woodruff County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Lincoln Parish, LA, Red River Parish, LA, Webster Parish, LA, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Dunklin County, MO, Iron County, MO, Madison County, MO, New Madrid County, MO, Oregon County, MO, Pemiscot County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Wayne County, MO, Cass County, TX, Cherokee County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX, Upshur County, TX

The radar

The Little Rock radar (KLZK), 12 km from the middle of the area, began a volume at 04:43 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.

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 4.7 hours before the alert went out and 222 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-pSkew-T log-p diagram, Little Rock, AR at 00:00Z on 2020-01-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 346 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Little Rock, AR at 00:00Z on 2020-01-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 341 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
346 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
532 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
341 m²/s²
0-3 km storm-relative helicity
385 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.2

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.

IssuedProductOfficeCountiesLasted
Jan 10, 7:30 PM CSTMesoscale DiscussionSPCBaxter, Boone, Clark, Cleburne, Columbia, Conway and 34 more2 hr
Jan 10, 11:58 PM CSTTornado WatchSPCAshley, Chicot, Clay, Craighead, Crittenden, Cross and 6 more7 hr
Jan 11, 12:28 AM CSTTornado WatchSPCUnion8 hr
Jan 11, 3:52 AM CSTMesoscale DiscussionSPCCrittenden, Desha, Lee, Mississippi, Phillips, St. Francis83 min
Jan 11, 12:21 AM CSTMesoscale DiscussionSPCAcadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 11 more99 min
Jan 11, 1:19 AM CSTMesoscale DiscussionSPCBienville, Caldwell, Claiborne, De Soto, Jackson, Lincoln and 7 more86 min
Jan 11, 2:22 AM CSTMesoscale DiscussionSPCCatahoula, Concordia, East Carroll, Franklin, Madison, Richland and 2 more53 min
Jan 11, 2:37 AM CSTTornado WatchSPCCatahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more8 hr
Jan 11, 4:31 AM CSTMesoscale DiscussionSPCAcadia, Ascension, Avoyelles, Caldwell, Catahoula, Concordia and 21 more59 min
Jan 11, 5:18 AM CSTTornado WatchSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 16 more7 hr
Jan 11, 7:39 AM CSTMesoscale DiscussionSPCAscension, Assumption, Jefferson, Lafourche, Livingston, Orleans and 8 more96 min
Jan 11, 3:10 PM CSTMesoscale DiscussionSPCAudrain, Boone, Callaway, Cole, Crawford, Franklin and 15 more4 hr
Jan 10, 6:30 PM CSTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 16 more2 hr
Jan 10, 8:49 PM CSTMesoscale DiscussionSPCAngelina, Austin, Brazoria, Brazos, Burleson, Chambers and 25 more116 min
Jan 10, 9:09 PM CSTTornado WatchSPCAustin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more5 hr
Jan 11, 7:34 AM CSTMesoscale DiscussionSPCCooke, Denton, Fannin, Grayson116 min

Nearby

Mesoscale Discussions in Arkansas, 2020Mesoscale Discussions in Missouri, 2020Mesoscale Discussions in Texas, 2020Every 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.