Alert archive / Arkansas / Mesoscale Discussions in 2014

Mesoscale Discussion 257

April 3, 201434 counties in Arkansas; 24 counties in Missouri; Adair County, LeFlore County, Sequoyah County, Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2014, 9:18 AM CDT for 34 counties in Arkansas; 24 counties in Missouri; Adair County, LeFlore County, Sequoyah County, Oklahoma. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Apr 3, 2014, 9:18 AM CDT (14:18 UTC)
Expired
Apr 3, 2014, 10:15 AM CDT
In force
57 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 61 counties

Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Cleburne County, AR, Conway County, AR, Crawford County, AR, Faulkner County, AR, Franklin County, AR, Fulton County, AR, Garland County, AR, Hot Spring County, AR, Howard County, AR, Izard County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sevier County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, Yell County, AR, Barry County, MO, Camden County, MO, Cedar County, MO, Christian County, MO, Dade County, MO, Dallas County, MO, Douglas County, MO, Greene County, MO, Hickory County, MO, Howell County, MO, Jasper County, MO, Laclede County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Ozark County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Webster County, MO, Wright County, MO, Adair County, OK, LeFlore County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 91 km from the middle of the area, began a volume at 14:19 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 12:00Z, 2.3 hours before the alert went out and 117 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 12:00Z on 2014-04-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1727 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 12:00Z on 2014-04-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 417 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
1727 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
686 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
417 m²/s²
0-3 km storm-relative helicity
423 m²/s²
Significant tornado parameter
3.5
Supercell composite
15.3

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 3, 9:33 AM CDTTornado WatchSPCBaxter, Benton, Boone, Calhoun, Carroll, Clark and 38 more7 hr
Apr 3, 12:05 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Clark, Cleburne and 27 more55 min
Apr 3, 12:33 PM CDTMesoscale DiscussionSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more87 min
Apr 3, 1:15 PM CDTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more8 hr
Apr 3, 1:46 PM CDTMesoscale DiscussionSPCHempstead, Howard, Little River, Miller, Montgomery, Pike and 4 more89 min
Apr 3, 1:50 PM CDTTornado WatchSPCHempstead, Howard, Lafayette, Little River, Miller, Nevada and 1 more7 hr
Apr 3, 3:48 PM CDTMesoscale DiscussionSPCBenton, Carroll, Crawford, Madison, Washington57 min
Apr 3, 4:34 PM CDTMesoscale DiscussionSPCBaxter, Boone, Calhoun, Clark, Cleburne, Conway and 35 more26 min
Apr 3, 4:58 PM CDTTornado WatchSPCBaxter, Boone, Calhoun, Clark, Cleburne, Conway and 31 more7 hr
Apr 2, 9:36 PM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Camden, Cass, Cedar and 18 more54 min
Apr 2, 9:59 PM CDTSevere Thunderstorm WatchSPCBarton, Bates, Benton, Camden, Carroll, Cass and 21 more7 hr
Apr 3, 12:00 AM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Camden, Carroll, Cass and 22 more90 min
Apr 3, 1:05 AM CDTMesoscale DiscussionSPCAdair, Andrew, Atchison, Buchanan, Caldwell, Clark and 19 more55 min
Apr 3, 2:49 AM CDTMesoscale DiscussionSPCAdair, Audrain, Barton, Bates, Benton, Boone and 65 more116 min
Apr 3, 12:28 PM CDTMesoscale DiscussionSPCBollinger, Butler, Cape Girardeau, Iron, Madison, Mississippi and 7 more62 min
Apr 3, 12:46 PM CDTTornado WatchSPCBollinger, Butler, Cape Girardeau, Carter, Crawford, Iron and 12 more4 hr
Apr 3, 3:17 PM CDTMesoscale DiscussionSPCAudrain, Boone, Carroll, Chariton, Cooper, Howard and 10 more58 min
Apr 3, 6:42 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Choctaw, Love, McCurtain, Marshall and 1 more93 min

Nearby

Mesoscale Discussions in Arkansas, 2014Mesoscale Discussions in Missouri, 2014Mesoscale Discussions in Oklahoma, 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.