Alert archive / Arkansas / Mesoscale Discussions in 2020

Mesoscale Discussion 677

May 22, 202015 counties in Arkansas; 5 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 22, 2020, 9:14 PM CDT for 15 counties in Arkansas; 5 counties in Oklahoma. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: May 22, 2020, 9:14 PM CDT (02:14 UTC)
Expired: May 22, 2020, 10:45 PM CDT
In force: 91 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 206

Counties Conway County, AR, Crawford County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Johnson County, AR, Logan County, AR, Montgomery County, AR, Perry County, AR, Polk County, AR, Pope County, AR, Scott County, AR, Sebastian County, AR, Van Buren County, AR, Yell County, AR, Haskell County, OK, Latimer County, OK, LeFlore County, OK, Pittsburg County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 31 km from the middle of the area, began a volume at 02:14 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 00:00Z, 2.2 hours before the alert went out and 208 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: 353 J/kg
Mixed-layer CIN: -178 J/kg
Mixed-layer LCL: 993 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 191 m²/s²
0-3 km storm-relative helicity: 241 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

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 22, 7:17 PM CDT	Mesoscale Discussion	SPC	Crawford, Franklin, Garland, Howard, Johnson, Logan and 8 more	58 min
May 22, 7:34 PM CDT	Severe Thunderstorm Watch	SPC	Clark, Cleveland, Conway, Crawford, Dallas, Faulkner and 27 more	8 hr
May 22, 11:56 PM CDT	Mesoscale Discussion	SPC	Conway, Crawford, Faulkner, Franklin, Garland, Grant and 12 more	2 hr
May 23, 11:56 AM CDT	Mesoscale Discussion	SPC	Ashley, Chicot	94 min
May 22, 7:00 PM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Caddo, Carter, Cleveland, Coal and 16 more	8 hr
May 22, 9:26 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Caddo, Carter, Cleveland, Coal and 16 more	2 hr
May 23, 2:18 PM CDT	Mesoscale Discussion	SPC	Beaver, Ellis, Harper, Roger Mills	117 min
May 23, 3:06 PM CDT	Severe Thunderstorm Watch	SPC	Beaver, Beckham, Ellis, Greer, Harmon, Jackson and 1 more	7 hr
May 23, 5:25 PM CDT	Mesoscale Discussion	SPC	Beaver, Beckham, Ellis, Greer, Harmon, Jackson and 1 more	2 hr

Nearby

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