Alert archive / Oklahoma / Mesoscale Discussions in 2020

Mesoscale Discussion 598

May 15, 202028 counties in Oklahoma; 13 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 15, 2020, 1:08 PM CDT for 28 counties in Oklahoma; 13 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 15, 2020, 1:08 PM CDT (18:08 UTC)
Expired: May 15, 2020, 3:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 41 counties

Atoka County, OK, Bryan County, OK, Caddo County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kiowa County, OK, Latimer County, OK, Love County, OK, Marshall County, OK, McClain County, OK, McCurtain County, OK, Murray County, OK, Pittsburg County, OK, Pontotoc County, OK, Pushmataha County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Cooke County, TX, Fannin County, TX, Foard County, TX, Grayson County, TX, Hardeman County, TX, Lamar County, TX, Montague County, TX, Red River County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Norman radar (KTLX), 84 km from the middle of the area, began a volume at 18:07 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, 6.1 hours before the alert went out and 71 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: 1862 J/kg
Mixed-layer CIN: -241 J/kg
Mixed-layer LCL: 909 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 292 m²/s²
0-3 km storm-relative helicity: 249 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 14, 10:04 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Dewey, Ellis, Major, Woods, Woodward	116 min
May 15, 11:04 AM CDT	Mesoscale Discussion	SPC	Haskell, Hughes, Latimer, LeFlore, McIntosh, Okfuskee and 4 more	86 min
May 15, 1:39 PM CDT	Severe Thunderstorm Watch	SPC	Atoka, Beckham, Bryan, Caddo, Carter, Choctaw and 25 more	8 hr
May 15, 3:36 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Caddo, Carter, Choctaw, Coal and 17 more	84 min
May 15, 6:59 PM CDT	Mesoscale Discussion	SPC	Bryan, Carter, Comanche, Cotton, Jefferson, Johnston and 5 more	2 hr
May 15, 2:30 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Brewster, Brown, Callahan, Childress and 54 more	2 hr
May 15, 2:55 PM CDT	Severe Thunderstorm Watch	SPC	Andrews, Bandera, Borden, Brewster, Brown, Callahan and 66 more	7 hr
May 15, 5:29 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Brown, Callahan, Clay, Coke and 37 more	2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2020 Mesoscale Discussions in Texas, 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.