Alert archive / Arkansas / Mesoscale Discussions in 2014

Mesoscale Discussion 1868

October 13, 20146 states

The Storm Prediction Center issued this mesoscale discussion at Oct 13, 2014, 10:20 AM CDT for 6 states. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued
Oct 13, 2014, 10:20 AM CDT (15:20 UTC)
Expired
Oct 13, 2014, 12:15 PM CDT
In force
115 min
Issued by
the Storm Prediction Center
All 75 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Chicot County, AR, Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Desha County, AR, Drew County, AR, Greene County, AR, Independence County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Randolph County, AR, Sharp County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Dunklin County, MO, Pemiscot County, MO, Adams County, MS, Bolivar County, MS, Claiborne County, MS, Coahoma County, MS, DeSoto County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Leflore County, MS, Panola County, MS, Quitman County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Warren County, MS, Washington County, MS, Dyer County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Sabine County, TX

The radar

The Little Rock radar (KLZK), 125 km from the middle of the area, began a volume at 15:23 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 (KBYH), launched 12:00Z, 3.3 hours before the alert went out and 210 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 12:00Z on 2014-10-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 687 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 12:00Z on 2014-10-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 228 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
687 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
657 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
228 m²/s²
0-3 km storm-relative helicity
216 m²/s²
Significant tornado parameter
1.0
Supercell composite
7.6

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
Oct 12, 8:04 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 13 more86 min
Oct 13, 12:00 AM CDTMesoscale DiscussionSPCBenton, Crawford, Sebastian, Washington90 min
Oct 13, 12:55 AM CDTSevere Thunderstorm WatchSPCBaxter, Benton, Boone, Carroll, Clark, Cleburne and 27 more7 hr
Oct 13, 1:59 AM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Clark, Cleburne and 28 more91 min
Oct 13, 2:43 AM CDTMesoscale DiscussionSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more92 min
Oct 13, 3:22 AM CDTTornado WatchSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more8 hr
Oct 13, 6:34 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 36 more86 min
Oct 13, 6:56 AM CDTMesoscale DiscussionSPCBaxter, Boone, Clark, Cleburne, Conway, Dallas and 17 more64 min
Oct 13, 7:08 AM CDTTornado WatchSPCArkansas, Ashley, Baxter, Bradley, Calhoun, Chicot and 44 more7 hr
Oct 13, 11:52 AM CDTMesoscale DiscussionSPCChicot, Clay, Craighead, Crittenden, Cross, Desha and 6 more113 min
Oct 13, 12:57 PM CDTTornado WatchSPCChicot, Clay, Crittenden, Mississippi7 hr
Oct 13, 11:10 AM CDTTornado WatchSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 10 more8 hr
Oct 13, 1:39 PM CDTTornado WatchSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 16 more8 hr
Oct 13, 5:45 PM CDTMesoscale DiscussionSPCJefferson, Lafourche, Orleans, Saint Charles, Saint James, Saint John the Baptist and 4 more90 min
Oct 12, 11:46 PM CDTMesoscale DiscussionSPCCalhoun, Carroll, Chickasaw, Clay, Grenada, Itawamba and 10 more89 min
Oct 13, 2:22 PM CDTMesoscale DiscussionSPCAlcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 32 more113 min
Oct 13, 5:27 PM CDTMesoscale DiscussionSPCItawamba, Monroe, Tishomingo63 min
Oct 13, 8:05 AM CDTMesoscale DiscussionSPCBollinger, Butler, Cape Girardeau, Carter, Howell, Iron and 13 more115 min
Oct 13, 10:29 AM CDTTornado WatchSPCBollinger, Butler, Cape Girardeau, Carter, Franklin, Iron and 16 more8 hr
Oct 13, 11:59 AM CDTMesoscale DiscussionSPCBollinger, Butler, Madison, Perry, Sainte Genevieve, Saint Francois and 2 more61 min
Oct 13, 1:33 PM CDTMesoscale DiscussionSPCBollinger, Cape Girardeau, Mississippi, New Madrid, Perry, Scott and 1 more57 min
Oct 13, 3:37 PM CDTTornado WatchSPCBedford, Cannon, Cheatham, Clay, Coffee, Cumberland and 35 more8 hr
Oct 12, 7:45 PM CDTSevere Thunderstorm WatchSPCArcher, Baylor, Borden, Brown, Callahan, Clay and 31 more7 hr
Oct 12, 9:47 PM CDTMesoscale DiscussionSPCArcher, Baylor, Clay, Fisher, Foard, Haskell and 10 more58 min
Oct 12, 10:17 PM CDTMesoscale DiscussionSPCCollin, Cooke, Dallas, Delta, Denton, Ellis and 20 more58 min
Oct 12, 11:08 PM CDTTornado WatchSPCBosque, Collin, Comanche, Cooke, Coryell, Dallas and 29 more7 hr

Nearby

Mesoscale Discussions in Arkansas, 2014Mesoscale Discussions in Louisiana, 2014Mesoscale Discussions in Mississippi, 2014Every mesoscale discussion in 2014

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.