Alert archive / Arkansas / Mesoscale Discussions in 2014

Mesoscale Discussion 346

April 13, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2014, 10:33 PM CDT for 4 states. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Apr 13, 2014, 10:33 PM CDT (03:33 UTC)
Expired
Apr 13, 2014, 11:30 PM CDT
In force
57 min
Issued by
the Storm Prediction Center
All 68 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Columbia County, AR, Conway County, AR, Crawford County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Desha 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, Jackson County, AR, Jefferson County, AR, Johnson County, AR, Lafayette County, AR, Lee County, AR, Lincoln County, AR, Logan County, AR, Lonoke County, AR, Miller County, AR, Monroe County, AR, Montgomery County, AR, Nevada 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, Saline County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, St. Francis County, AR, Union County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Bolivar County, MS, Coahoma County, MS, DeSoto County, MS, Tunica County, MS, Choctaw County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK, Sequoyah County, OK, Shelby County, TN, Tipton County, TN

The radar

The Little Rock radar (KLZK), 104 km from the middle of the area, began a volume at 03:35 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

Shreveport, LA (KBAD), launched 00:00Z, 3.6 hours before the alert went out and 231 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 2014-04-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 244 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, Shreveport, LA at 00:00Z on 2014-04-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 544 square meters per square second.1939587897Sfc1 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
244 J/kg
Mixed-layer CIN
-117 J/kg
Mixed-layer LCL
826 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
544 m²/s²
0-3 km storm-relative helicity
713 m²/s²
Significant tornado parameter
0.4
Supercell composite
5.2

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 13, 7:14 PM CDTSevere Thunderstorm WatchSPCClark, Cleburne, Conway, Crawford, Faulkner, Franklin and 16 more6 hr
Apr 13, 7:54 PM CDTMesoscale DiscussionSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more66 min
Apr 13, 9:12 PM CDTMesoscale DiscussionSPCClay, Craighead, Cross, Fulton, Greene, Independence and 8 more63 min
Apr 13, 11:06 PM CDTSevere Thunderstorm WatchSPCArkansas, Bradley, Calhoun, Cleveland, Columbia, Crittenden and 28 more6 hr
Apr 14, 1:22 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 6 more53 min
Apr 14, 1:50 AM CDTTornado WatchSPCAshley, Chicot5 hr
Apr 14, 2:05 AM CDTMesoscale DiscussionSPCBradley, Calhoun, Columbia, Desha, Drew, Hempstead and 5 more85 min
Apr 14, 4:34 AM CDTMesoscale DiscussionSPCClaiborne, Copiah, Hinds, Leake, Madison, Newton and 4 more56 min
Apr 14, 12:30 PM CDTMesoscale DiscussionSPCAdams, Claiborne, Copiah, Franklin, Hinds, Humphreys and 7 more2 hr
Apr 14, 1:11 PM CDTSevere Thunderstorm WatchSPCAdams, Amite, Attala, Claiborne, Clarke, Copiah and 37 more10 hr
Apr 14, 3:36 PM CDTMesoscale DiscussionSPCGeorge, Hancock, Harrison, Jackson, Pearl River, Stone2 hr

Nearby

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