Alert archive / Arkansas / Mesoscale Discussions in 2020

Mesoscale Discussion 18

January 10, 20205 states

The Storm Prediction Center issued this mesoscale discussion at Jan 10, 2020, 4:55 PM CST for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jan 10, 2020, 4:55 PM CST (22:55 UTC)
Expired
Jan 10, 2020, 7:00 PM CST
In force
2 hr
Issued by
the Storm Prediction Center
All 157 counties

Arkansas County, AR, Ashley County, AR, Baxter County, AR, Boone County, AR, Bradley County, AR, Calhoun County, AR, Carroll County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Columbia County, AR, Conway County, AR, Craighead County, AR, Crawford County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Franklin County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Johnson County, AR, Lafayette County, AR, Lawrence County, AR, Lincoln County, AR, Little River County, AR, Logan County, AR, Lonoke County, AR, Madison County, AR, Marion County, AR, Miller County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Newton County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Poinsett County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sevier County, AR, Sharp County, AR, Stone County, AR, Union County, AR, Van Buren County, AR, Washington County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Barry County, MO, Carter County, MO, Christian County, MO, Dent County, MO, Douglas County, MO, Howell County, MO, Oregon County, MO, Ozark County, MO, Reynolds County, MO, Ripley County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Wright County, MO, Atoka County, OK, Bryan County, OK, Choctaw County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK, Anderson County, TX, Angelina County, TX, Bell County, TX, Bosque County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Collin County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Falls County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Grayson County, TX, Gregg County, TX, Hamilton County, TX, Harrison County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Houston County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Lampasas County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Marion County, TX, McLennan County, TX, Morris County, TX, Nacogdoches County, TX, Navarro County, TX, Panola County, TX, Rains County, TX, Red River County, TX, Robertson County, TX, Rockwall County, TX, Rusk County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Somervell County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Western Arkansas radar (KSRX), 156 km from the middle of the area, began a volume at 22:53 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

Shreveport, LA (KSHV), launched 12:00Z, 10.9 hours before the alert went out and 166 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, Shreveport, LA at 12:00Z on 2020-01-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 400 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, Shreveport, LA at 12:00Z on 2020-01-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 315 square meters per square second.1939587897Sfc1 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
400 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
506 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
315 m²/s²
0-3 km storm-relative helicity
385 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.3

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, 4:53 AM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 19 more2 hr
Jan 10, 10:42 AM CSTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more10 hr
Jan 10, 1:44 PM CSTMesoscale DiscussionSPCBenton, Crawford, Washington91 min
Jan 10, 5:34 PM CSTTornado WatchSPCArkansas, Baxter, Boone, Bradley, Calhoun, Clark and 50 more11 hr
Jan 10, 12:11 PM CSTMesoscale DiscussionSPCBarton, Cedar, Dade, Greene, Hickory, Jasper and 4 more2 hr
Jan 10, 12:54 PM CSTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Clinton, Daviess, DeKalb and 9 more6 hr
Jan 10, 6:30 AM CSTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 13 more60 min
Jan 10, 7:44 AM CSTSevere Thunderstorm WatchSPCAlfalfa, Blaine, Custer, Dewey, Garfield, Grant and 12 more67 days
Jan 10, 9:12 AM CSTMesoscale DiscussionSPCAlfalfa, Atoka, Blaine, Caddo, Canadian, Cherokee and 42 more93 min
Jan 10, 11:47 AM CSTMesoscale DiscussionSPCBryan, Choctaw118 min
Jan 10, 1:21 PM CSTMesoscale DiscussionSPCCaddo, Canadian, Comanche, Garfield, Grady, Grant and 2 more54 min
Jan 10, 1:20 PM CSTTornado WatchSPCAnderson, Bell, Bosque, Collin, Cooke, Coryell and 33 more11 hr
Jan 10, 2:52 PM CSTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 17 more113 min
Jan 10, 2:59 PM CSTMesoscale DiscussionSPCBosque, Collin, Dallas, Delta, Denton, Ellis and 13 more2 hr
Jan 10, 3:30 PM CSTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bastrop, Bee, Bexar, Blanco and 26 more68 days

Nearby

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