Alert archive / Oklahoma / Mesoscale Discussions in 2022

Mesoscale Discussion 643

May 4, 202219 counties in Oklahoma; 10 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 4, 2022, 2:26 PM CDT for 19 counties in Oklahoma; 10 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 4, 2022, 2:26 PM CDT (19:26 UTC)
Expired: May 4, 2022, 4:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Tornado watch 176

All 29 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Jefferson County, OK, Johnston County, OK, Latimer County, OK, Love County, OK, Marshall County, OK, McCurtain County, OK, Murray County, OK, Pittsburg County, OK, Pontotoc County, OK, Pushmataha County, OK, Stephens County, OK, Archer County, TX, Clay County, TX, Cooke County, TX, Delta County, TX, Fannin County, TX, Grayson County, TX, Lamar County, TX, Montague County, TX, Red River County, TX, Wichita County, TX

The radar

The Norman radar (KTLX), 138 km from the middle of the area, began a volume at 19:25 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

Norman, OK (KOUN), launched 12:00Z, 7.4 hours before the alert went out and 130 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: 4 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 434 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 400 m²/s²
0-3 km storm-relative helicity: 430 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.3

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, 11:28 AM CDT	Mesoscale Discussion	SPC	Caddo, Carter, Cleveland, Comanche, Cotton, Garvin and 8 more	3 hr
May 4, 12:33 PM CDT	Mesoscale Discussion	SPC	Harmon, Texas	3 hr
May 4, 1:26 PM CDT	Tornado Watch	SPC	Blaine, Caddo, Canadian, Carter, Cleveland, Coal and 28 more	8 hr
May 4, 1:56 PM CDT	Tornado Watch	SPC	Beckham, Custer, Dewey, Greer, Harmon, Jackson and 4 more	8 hr
May 4, 5:52 PM CDT	Mesoscale Discussion	SPC	Comanche, Cotton, Harmon, Jackson, Kiowa, Tillman	83 min
May 4, 6:11 PM CDT	Mesoscale Discussion	SPC	Atoka, Cleveland, Coal, Garvin, Grady, Hughes and 8 more	94 min
May 4, 1:35 PM CDT	Mesoscale Discussion	SPC	Coke, Crockett, Glasscock, Howard, Irion, Midland and 10 more	2 hr
May 4, 2:26 PM CDT	Tornado Watch	SPC	Borden, Callahan, Coke, Coleman, Concho, Crockett and 25 more	8 hr

Nearby

Mesoscale Discussions in Oklahoma, 2022 Mesoscale Discussions in Texas, 2022 Every mesoscale discussion in 2022

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.