Alert archive / Arkansas / Mesoscale Discussions in 2015

Mesoscale Discussion 260

April 9, 20155 states

The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2015, 6:11 PM CDT for 5 states. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
Apr 9, 2015, 6:11 PM CDT (23:11 UTC)
Expired
Apr 9, 2015, 7:15 PM CDT
In force
64 min
Issued by
the Storm Prediction Center
All 94 counties

Arkansas County, AR, Baxter County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Clay County, AR, Cleburne County, AR, Cleveland 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, 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, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Little River County, AR, Logan County, AR, Lonoke County, AR, Marion 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, 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, St. Francis County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Fulton County, KY, Butler County, MO, Carter County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Pemiscot County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO, Benton County, MS, Bolivar County, MS, Coahoma County, MS, DeSoto County, MS, Lafayette County, MS, Marshall County, MS, Panola County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Dyer County, TN, Fayette County, TN, Haywood County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN

The radar

The Little Rock radar (KLZK), 80 km from the middle of the area, began a volume at 23:14 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, 11.2 hours before the alert went out and 145 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 2015-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 91 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 2015-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 215 square meters per square second.193958Sfc1 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
91 J/kg
Mixed-layer CIN
-182 J/kg
Mixed-layer LCL
880 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
215 m²/s²
0-3 km storm-relative helicity
200 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.2

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
Apr 9, 2:15 PM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 32 more2 hr
Apr 9, 2:32 PM CDTSevere Thunderstorm WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more7 hr
Apr 9, 3:06 PM CDTTornado WatchSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 13 more7 hr
Apr 9, 3:17 PM CDTSevere Thunderstorm WatchSPCBaxter, Boone, Cleburne, Conway, Faulkner, Fulton and 29 more7 hr
Apr 9, 6:32 PM CDTSevere Thunderstorm WatchSPCAshley, Chicot, Clay, Craighead, Crittenden, Cross and 8 more5 hr
Apr 9, 12:51 PM CDTMesoscale DiscussionSPCBoone, Bracken, Campbell, Fleming, Greenup, Kenton and 5 more54 min
Apr 9, 1:26 PM CDTSevere Thunderstorm WatchSPCAnderson, Bath, Boone, Bourbon, Boyd, Bracken and 30 more8 hr
Apr 9, 3:01 PM CDTMesoscale DiscussionSPCBath, Boone, Bourbon, Boyd, Bracken, Campbell and 27 more59 min
Apr 9, 3:45 PM CDTMesoscale DiscussionSPCBallard60 min
Apr 9, 3:49 PM CDTMesoscale DiscussionSPCAnderson, Boone, Bracken, Campbell, Carroll, Franklin and 12 more56 min
Apr 9, 6:48 PM CDTTornado WatchSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more6 hr
Apr 8, 7:04 PM CDTMesoscale DiscussionSPCBollinger, Cape Girardeau, Iron, Madison, Perry, Sainte Genevieve and 1 more116 min
Apr 9, 12:29 PM CDTMesoscale DiscussionSPCAdair, Clark, Grundy, Knox, Linn, Macon and 5 more91 min
Apr 9, 12:58 PM CDTTornado WatchSPCAdair, Audrain, Boone, Callaway, Carroll, Chariton and 27 more6 hr
Apr 9, 1:32 PM CDTMesoscale DiscussionSPCBarry, Barton, Benton, Camden, Cedar, Dade and 11 more118 min
Apr 9, 3:12 PM CDTMesoscale DiscussionSPCAdair, Audrain, Boone, Chariton, Clark, Cooper and 19 more93 min
Apr 9, 4:40 PM CDTTornado WatchSPCCrawford, Franklin, Iron, Jefferson, Lincoln, Madison and 8 more6 hr
Apr 9, 4:06 PM CDTMesoscale DiscussionSPCCarter, Johnson, Unicoi54 min

Nearby

Mesoscale Discussions in Arkansas, 2015Mesoscale Discussions in Mississippi, 2015Mesoscale Discussions in Missouri, 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.