Alert archive / Oklahoma / Mesoscale Discussions in 2020

Mesoscale Discussion 536

May 4, 202012 counties in Arkansas; 10 counties in Missouri; 17 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 4, 2020, 6:42 PM CDT for 12 counties in Arkansas; 10 counties in Missouri; 17 counties in Oklahoma. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 4, 2020, 6:42 PM CDT (23:42 UTC)
Expired
May 4, 2020, 8:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 39 counties

Benton County, AR, Boone County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Newton County, AR, Scott County, AR, Sebastian County, AR, Washington County, AR, Barry County, MO, Christian County, MO, Dade County, MO, Greene County, MO, Jasper County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Stone County, MO, Taney County, MO, Adair County, OK, Cherokee County, OK, Delaware County, OK, Haskell County, OK, Hughes County, OK, Latimer County, OK, LeFlore County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Ottawa County, OK, Pittsburg County, OK, Seminole County, OK, Sequoyah County, OK, Wagoner County, OK

The radar

The Western Arkansas radar (KSRX), 74 km from the middle of the area, began a volume at 23:42 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 nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 11.7 hours before the alert went out and 151 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 2020-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2020-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 99 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
988 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
99 m²/s²
0-3 km storm-relative helicity
190 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

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 4, 9:00 AM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Crawford, Franklin, Johnson and 4 more90 min
May 4, 10:38 AM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Cleburne, Fulton and 12 more97 min
May 4, 12:35 PM CDTSevere Thunderstorm WatchSPCBaxter, Boone, Cleburne, Fulton, Independence, Izard and 9 more5 hr
May 4, 1:04 PM CDTMesoscale DiscussionSPCBaxter, Boone, Cleburne, Fulton, Independence, Izard and 8 more86 min
May 4, 1:21 PM CDTMesoscale DiscussionSPCBenton114 min
May 4, 2:02 PM CDTMesoscale DiscussionSPCClay, Craighead, Greene, Mississippi, Poinsett118 min
May 4, 2:32 PM CDTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more9 hr
May 4, 2:58 PM CDTSevere Thunderstorm WatchSPCClay, Craighead, Crittenden, Greene, Mississippi, Poinsett6 hr
May 4, 3:44 PM CDTMesoscale DiscussionSPCClay, Greene, Mississippi, Randolph61 min
May 4, 6:21 PM CDTMesoscale DiscussionSPCMississippi54 min
May 4, 5:50 AM CDTMesoscale DiscussionSPCBarton, Bates, Cedar, Jasper, Newton, Vernon55 min
May 4, 6:33 AM CDTSevere Thunderstorm WatchSPCBarry, Barton, Bates, Benton, Buchanan, Camden and 40 more12 hr
May 4, 3:46 PM CDTMesoscale DiscussionSPCCarter, Cleveland, Garvin, Jefferson, Johnston, Lincoln and 11 more119 min
May 4, 4:38 PM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Carter, Cleveland, Garvin, Jefferson and 7 more5 hr

Nearby

Mesoscale Discussions in Oklahoma, 2020Mesoscale Discussions in Arkansas, 2020Mesoscale Discussions in Missouri, 2020Every mesoscale discussion in 2020

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.