Alert archive / Oklahoma / Mesoscale Discussions in 2020

Mesoscale Discussion 730

May 25, 20207 counties in Arkansas; 13 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 25, 2020, 5:59 PM CDT for 7 counties in Arkansas; 13 counties in Oklahoma. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 25, 2020, 5:59 PM CDT (22:59 UTC)
Expired: May 25, 2020, 8:30 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 40%

Counties Benton County, AR, Crawford County, AR, Franklin County, AR, Logan County, AR, Scott County, AR, Sebastian County, AR, Washington County, AR, Adair County, OK, Cherokee County, OK, Craig County, OK, Delaware County, OK, Mayes County, OK, Muskogee County, OK, Nowata County, OK, Osage County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 46 km from the middle of the area, began a volume at 23:03 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 226May 25, 6:15 PM CDT

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 11.0 hours before the alert went out and 160 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: 753 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 809 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.6

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 25, 1:50 PM CDT	Mesoscale Discussion	SPC	Crawford, Franklin, Hempstead, Howard, Lafayette, Little River and 9 more	85 min
May 25, 3:39 PM CDT	Mesoscale Discussion	SPC	Polk, Sebastian	96 min
May 25, 6:14 PM CDT	Tornado Watch	SPC	Benton, Carroll, Crawford, Franklin, Johnson, Logan and 7 more	5 hr
May 24, 8:43 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Custer, Dewey and 10 more	2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2020 Mesoscale Discussions in Arkansas, 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.