Alert archive / Arkansas / Mesoscale Discussions in 2018

Mesoscale Discussion 1676

December 1, 20185 states

The Storm Prediction Center issued this mesoscale discussion at Dec 1, 2018, 12:58 AM CST for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Dec 1, 2018, 12:58 AM CST (06:58 UTC)
Expired
Dec 1, 2018, 3:00 AM CST
In force
2 hr
Issued by
the Storm Prediction Center
All 105 counties

Arkansas County, AR, Ashley County, AR, Baxter County, AR, Boone County, AR, Bradley County, AR, Calhoun County, AR, Chicot 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, Desha County, AR, Drew County, AR, Faulkner 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, Lafayette County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Little River County, AR, Lonoke County, AR, Marion County, AR, Miller County, AR, Mississippi County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Newton County, AR, Ouachita County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Poinsett County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Searcy County, AR, Sevier County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Union County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne 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, Carter County, MO, Christian County, MO, Douglas County, MO, Greene 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, Webster County, MO, Wright County, MO, Bolivar County, MS, Coahoma County, MS, Tunica County, MS, Washington County, MS, Bowie County, TX, Camp County, TX, Cass County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Panola County, TX, Titus County, TX, Upshur County, TX

The radar

The Little Rock radar (KLZK), 57 km from the middle of the area, began a volume at 06:59 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

Springfield, MO (KSGF), launched 00:00Z, 7.0 hours before the alert went out and 257 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, Springfield, MO at 00:00Z on 2018-12-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 202 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, Springfield, MO at 00:00Z on 2018-12-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 241 square meters per square second.19395878Sfc1 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
202 J/kg
Mixed-layer CIN
-93 J/kg
Mixed-layer LCL
687 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
241 m²/s²
0-3 km storm-relative helicity
266 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.6

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
Nov 30, 6:17 PM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Clark, Cleburne and 47 more58 min
Nov 30, 6:40 PM CSTTornado WatchSPCArkansas, Baxter, Benton, Boone, Bradley, Calhoun and 63 more7 hr
Nov 30, 9:02 PM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Clark, Cleburne and 50 more58 min
Nov 30, 11:20 PM CSTMesoscale DiscussionSPCBaxter, Benton, Boone, Bradley, Calhoun, Carroll and 41 more85 min
Dec 1, 1:58 AM CSTTornado WatchSPCArkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 33 more5 hr
Dec 1, 3:25 AM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Chicot, Clay, Cleveland and 17 more2 hr
Dec 1, 4:31 AM CSTMesoscale DiscussionSPCClarke, Covington, Forrest, George, Greene, Harrison and 9 more59 min
Nov 30, 9:12 PM CSTMesoscale DiscussionSPCBarry, Barton, Christian, Dade, Douglas, Greene and 6 more2 hr
Nov 30, 9:47 PM CSTTornado WatchSPCBarry, Barton, Cedar, Christian, Dade, Dallas and 19 more5 hr
Dec 1, 1:48 PM CSTMesoscale DiscussionSPCPike, Saint Louis, City of Saint Louis117 min
Dec 1, 2:16 PM CSTTornado WatchSPCLincoln, Pike7 hr
Nov 30, 6:35 PM CSTMesoscale DiscussionSPCArcher, Bosque, Clay, Collin, Comanche, Cooke and 28 more85 min
Nov 30, 9:52 PM CSTMesoscale DiscussionSPCCollin, Dallas, Delta, Fannin, Hopkins, Hunt and 6 more83 min
Nov 30, 10:32 PM CSTMesoscale DiscussionSPCBell, Burnet, Ellis, Falls, Freestone, Henderson and 8 more88 min

Nearby

Mesoscale Discussions in Arkansas, 2018Mesoscale Discussions in Missouri, 2018Mesoscale Discussions in Louisiana, 2018Every mesoscale discussion in 2018

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.