Alert archive / Arkansas / Mesoscale Discussions in 2015

Mesoscale Discussion 2074

December 26, 201514 counties in Arkansas; 4 counties in Oklahoma; Lamar County, Red River County, Texas

The Storm Prediction Center issued this mesoscale discussion at Dec 26, 2015, 11:27 PM CST for 14 counties in Arkansas; 4 counties in Oklahoma; Lamar County, Red River County, Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Dec 26, 2015, 11:27 PM CST (05:27 UTC)
Expired
Dec 27, 2015, 1:30 AM CST
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
20%

Counties Boone County, AR, Crawford County, AR, Franklin County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Montgomery County, AR, Newton County, AR, Polk County, AR, Pope County, AR, Scott County, AR, Sebastian County, AR, Yell County, AR, Choctaw County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK, Lamar County, TX, Red River County, TX

The radar

The Western Arkansas radar (KSRX), 42 km from the middle of the area, began a volume at 05:31 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

Shreveport, LA (KBAD), launched 00:00Z, 5.5 hours before the alert went out and 276 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 00:00Z on 2015-12-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1166 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 2015-12-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 195 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
1166 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
958 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
195 m²/s²
0-3 km storm-relative helicity
220 m²/s²
Significant tornado parameter
1.2
Supercell composite
9.6

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.

IssuedProductOfficeCountiesLasted
Dec 26, 7:32 PM CSTMesoscale DiscussionSPCCrawford, Sebastian88 min
Dec 27, 5:44 AM CSTMesoscale DiscussionSPCLittle River, Sevier3 hr
Dec 27, 8:56 AM CSTTornado WatchSPCHempstead, Howard, Lafayette, Little River, Miller, Sevier10 hr
Dec 27, 12:45 PM CSTMesoscale DiscussionSPCHempstead, Howard, Lafayette, Little River, Miller, Sevier2 hr
Dec 27, 12:47 PM CSTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Cleveland, Columbia, Drew and 2 more88 min
Dec 27, 2:27 PM CSTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Cleveland, Columbia, Dallas and 7 more63 min
Dec 27, 2:47 PM CSTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Clark, Cleveland and 15 more7 hr
Dec 27, 4:55 PM CSTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Cleveland, Columbia, Dallas and 8 more2 hr
Dec 27, 3:38 AM CSTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 11 more6 hr
Dec 27, 4:36 AM CSTMesoscale DiscussionSPCBeaver, Ellis, Texas6 hr
Dec 27, 9:50 AM CSTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 16 more6 hr
Dec 27, 12:04 PM CSTMesoscale DiscussionSPCJefferson, Love, Marshall2 hr
Dec 27, 3:55 PM CSTMesoscale DiscussionSPCBeckham, Caddo, Canadian, Cleveland, Comanche, Cotton and 10 more4 hr
Dec 26, 8:09 PM CSTMesoscale DiscussionSPCBorden, Callahan, Coke, Coleman, Concho, Crockett and 21 more2 hr
Dec 26, 8:58 PM CSTSevere Thunderstorm WatchSPCBandera, Crockett, Edwards, Gillespie, Kerr, Kimble and 11 more7 hr
Dec 26, 11:21 PM CSTMesoscale DiscussionSPCArmstrong, Bailey, Briscoe, Carson, Castro, Cochran and 17 more5 hr
Dec 26, 11:48 PM CSTMesoscale DiscussionSPCConcho, Edwards, Gillespie, Kerr, Kimble, Kinney and 11 more87 min
Dec 27, 5:15 AM CSTMesoscale DiscussionSPCAndrews, Cochran, Crane, Culberson, Ector, Gaines and 10 more5 hr
Dec 27, 11:24 AM CSTMesoscale DiscussionSPCAndrews, Bailey, Borden, Castro, Cochran, Crane and 24 more6 hr
Dec 27, 3:19 PM CSTMesoscale DiscussionSPCBrazoria, Chambers, Fort Bend, Galveston, Harris, Houston and 7 more116 min

Nearby

Mesoscale Discussions in Arkansas, 2015Mesoscale Discussions in Oklahoma, 2015Mesoscale Discussions in Texas, 2015Every mesoscale discussion in 2015

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.