Alert archive / Oklahoma / Mesoscale Discussions in 2020

Mesoscale Discussion 531

May 4, 20204 states

The Storm Prediction Center issued this mesoscale discussion at May 4, 2020, 1:21 PM CDT for 4 states. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: May 4, 2020, 1:21 PM CDT (18:21 UTC)
Expired: May 4, 2020, 3:15 PM CDT
In force: 114 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 23 counties

Benton County, AR, Cherokee County, KS, Crawford County, KS, Labette County, KS, Montgomery County, KS, Barry County, MO, Jasper County, MO, McDonald County, MO, Newton County, MO, Adair County, OK, Cherokee County, OK, Craig County, OK, Delaware County, OK, Mayes County, OK, Muskogee County, OK, Nowata County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Rogers County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 42 km from the middle of the area, began a volume at 18:23 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.

Tornado Watch 163May 4, 2:35 PM CDT

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 6.4 hours before the alert went out and 141 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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.

Issued	Product	Office	Counties	Lasted
May 4, 9:00 AM CDT	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Crawford, Franklin, Johnson and 4 more	90 min
May 4, 10:38 AM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Fulton and 12 more	97 min
May 4, 12:35 PM CDT	Severe Thunderstorm Watch	SPC	Baxter, Boone, Cleburne, Fulton, Independence, Izard and 9 more	5 hr
May 4, 1:04 PM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Cleburne, Fulton, Independence, Izard and 8 more	86 min
May 4, 2:02 PM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Greene, Mississippi, Poinsett	118 min
May 4, 2:32 PM CDT	Tornado Watch	SPC	Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more	9 hr
May 4, 2:58 PM CDT	Severe Thunderstorm Watch	SPC	Clay, Craighead, Crittenden, Greene, Mississippi, Poinsett	6 hr
May 4, 3:44 PM CDT	Mesoscale Discussion	SPC	Clay, Greene, Mississippi, Randolph	61 min
May 4, 6:21 PM CDT	Mesoscale Discussion	SPC	Mississippi	54 min
May 4, 6:42 PM CDT	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Crawford, Franklin, Johnson and 6 more	2 hr
May 4, 1:39 AM CDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Graham, Norton, Phillips, Rawlins and 5 more	3 hr
May 4, 5:50 AM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Bourbon, Butler, Chase, Cherokee and 38 more	55 min
May 4, 6:33 AM CDT	Severe Thunderstorm Watch	SPC	Allen, Anderson, Atchison, Barton, Bourbon, Brown and 49 more	12 hr
May 4, 3:46 PM CDT	Mesoscale Discussion	SPC	Carter, Cleveland, Garvin, Jefferson, Johnston, Lincoln and 11 more	119 min
May 4, 4:38 PM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Carter, Cleveland, Garvin, Jefferson and 7 more	5 hr

Nearby

Mesoscale Discussions in Oklahoma, 2020 Mesoscale Discussions in Kansas, 2020 Mesoscale Discussions in Missouri, 2020 Every 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.