Alert archive / Arkansas / Mesoscale Discussions in 2018

Mesoscale Discussion 336

May 3, 201828 counties in Arkansas; Choctaw County, LeFlore County, McCurtain County, Oklahoma; 28 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 3, 2018, 12:35 PM CDT for 28 counties in Arkansas; Choctaw County, LeFlore County, McCurtain County, Oklahoma; 28 counties in Texas. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
May 3, 2018, 12:35 PM CDT (17:35 UTC)
Expired
May 3, 2018, 2:00 PM CDT
In force
85 min
Issued by
the Storm Prediction Center
All 59 counties

Boone County, AR, Carroll County, AR, Clark County, AR, Conway County, AR, Crawford County, AR, Franklin County, AR, Garland County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Johnson County, AR, Little River County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Miller County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sevier County, AR, Washington County, AR, Yell County, AR, Choctaw County, OK, LeFlore County, OK, McCurtain County, OK, Bell County, TX, Bosque County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Coryell County, TX, Delta County, TX, Ellis County, TX, Falls County, TX, Franklin County, TX, Freestone County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Limestone County, TX, McLennan County, TX, Morris County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 193 km from the middle of the area, began a volume at 17:36 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

Norman, OK (KOUN), launched 12:00Z, 5.6 hours before the alert went out and 258 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, Norman, OK at 12:00Z on 2018-05-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 236 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, Norman, OK at 12:00Z on 2018-05-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 85 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
236 J/kg
Mixed-layer CIN
-135 J/kg
Mixed-layer LCL
974 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
85 m²/s²
0-3 km storm-relative helicity
244 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 2, 10:20 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Crawford, Franklin and 6 more115 min
May 2, 11:09 PM CDTSevere Thunderstorm WatchSPCBaxter, Benton, Boone, Carroll, Crawford, Franklin and 12 more7 hr
May 3, 2:32 AM CDTMesoscale DiscussionSPCBaxter, Boone, Carroll, Franklin, Fulton, Izard and 6 more88 min
May 3, 9:02 AM CDTMesoscale DiscussionSPCCrawford, Franklin, Sebastian, Washington88 min
May 3, 1:44 PM CDTSevere Thunderstorm WatchSPCBaxter, Clark, Clay, Cleburne, Conway, Craighead and 34 more4 hr
May 3, 3:45 PM CDTMesoscale DiscussionSPCArkansas, Clark, Clay, Cleburne, Cleveland, Craighead and 25 more60 min
May 3, 4:52 PM CDTMesoscale DiscussionSPCBaxter, Clark, Clay, Cleburne, Cleveland, Conway and 31 more53 min
May 2, 7:14 PM CDTMesoscale DiscussionSPCAtoka, Cherokee, Coal, Craig, Creek, Delaware and 18 more2 hr
May 2, 8:05 PM CDTTornado WatchSPCAdair, Atoka, Bryan, Carter, Cherokee, Choctaw and 30 more6 hr
May 2, 11:09 PM CDTMesoscale DiscussionSPCAdair, Atoka, Bryan, Carter, Cherokee, Coal and 26 more96 min
May 3, 4:06 AM CDTMesoscale DiscussionSPCBryan, Carter, Cleveland, Coal, Comanche, Cotton and 14 more114 min
May 3, 5:18 AM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Carter, Coal, Comanche, Cotton and 11 more6 hr
May 3, 9:55 AM CDTMesoscale DiscussionSPCCarter, Coal, Comanche, Cotton, Garvin, Jefferson and 7 more65 min
May 2, 7:17 PM CDTMesoscale DiscussionSPCCallahan, Coke, Coleman, Concho, Crockett, Eastland and 27 more88 min
May 2, 10:27 PM CDTMesoscale DiscussionSPCBorden, Callahan, Coke, Coleman, Concho, Crockett and 28 more93 min
May 3, 5:55 AM CDTMesoscale DiscussionSPCBosque, Brown, Callahan, Coleman, Comanche, Concho and 28 more2 hr
May 3, 7:03 AM CDTSevere Thunderstorm WatchSPCBell, Bosque, Brown, Burnet, Coleman, Collin and 38 more7 hr
May 3, 5:42 PM CDTMesoscale DiscussionSPCBandera, Bexar, Dimmit, Edwards, Frio, Gillespie and 8 more2 hr

Nearby

Mesoscale Discussions in Arkansas, 2018Mesoscale Discussions in Texas, 2018Mesoscale Discussions in Oklahoma, 2018Every mesoscale discussion in 2018

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.