Alert archive / Arkansas / Mesoscale Discussions in 2018

Mesoscale Discussion 1671

November 30, 201856 counties in Arkansas; McCurtain County, Oklahoma; 4 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 30, 2018, 9:02 PM CST for 56 counties in Arkansas; McCurtain County, Oklahoma; 4 counties in Texas. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued
Nov 30, 2018, 9:02 PM CST (03:02 UTC)
Expired
Nov 30, 2018, 10:00 PM CST
In force
58 min
Issued by
the Storm Prediction Center
All 61 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Columbia County, AR, Conway County, AR, Crawford County, AR, Dallas County, AR, Drew County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Grant 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, Miller County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Newton County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski 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, McCurtain County, OK, Bowie County, TX, Cass County, TX, Morris County, TX, Titus County, TX

The radar

The Little Rock radar (KLZK), 119 km from the middle of the area, began a volume at 03:03 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

Springfield, MO (KSGF), launched 00:00Z, 3.0 hours before the alert went out and 295 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, 11:20 PM CSTMesoscale DiscussionSPCBaxter, Benton, Boone, Bradley, Calhoun, Carroll and 41 more85 min
Dec 1, 12:58 AM CSTMesoscale DiscussionSPCArkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 58 more2 hr
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
Nov 30, 6:35 PM CSTMesoscale DiscussionSPCAtoka, Bryan, Canadian, Carter, Cherokee, Choctaw and 44 more85 min
Nov 30, 9:52 PM CSTMesoscale DiscussionSPCAdair, Atoka, Bryan, Cherokee, Choctaw, Craig and 19 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 Texas, 2018Mesoscale Discussions in Oklahoma, 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.