Alert archive / Arkansas / Mesoscale Discussions in 2020

Mesoscale Discussion 665

May 22, 20206 counties in Arkansas; LeFlore County, Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 22, 2020, 9:15 AM CDT for 6 counties in Arkansas; LeFlore County, Oklahoma. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: May 22, 2020, 9:15 AM CDT (14:15 UTC)
Expired: May 22, 2020, 10:45 AM CDT
In force: 90 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 201

Counties Crawford County, AR, Franklin County, AR, Madison County, AR, Scott County, AR, Sebastian County, AR, Washington County, AR, LeFlore County, OK

The radar

The Western Arkansas radar (KSRX), 23 km from the middle of the area, began a volume at 14:16 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 12:00Z, 2.3 hours before the alert went out and 209 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: 22 J/kg
Mixed-layer CIN: -328 J/kg
Mixed-layer LCL: 704 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -34 m²/s²
0-3 km storm-relative helicity: 15 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

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, 12:02 PM CDT	Mesoscale Discussion	SPC	Arkansas, Cleburne, Conway, Craighead, Cross, Faulkner and 22 more	88 min
May 22, 4:29 PM CDT	Mesoscale Discussion	SPC	Crittenden	91 min
May 21, 9:10 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Ellis, Harper, Texas, Woods and 1 more	65 min
May 21, 9:49 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Beaver, Blaine, Canadian, Dewey, Ellis and 14 more	8 hr
May 21, 11:28 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Harper, Woods, Woodward	2 hr
May 22, 3:51 AM CDT	Mesoscale Discussion	SPC	Blaine, Canadian, Custer, Dewey, Garfield, Grant and 8 more	84 min
May 22, 5:01 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Atoka, Cherokee, Cleveland, Coal, Creek and 21 more	6 hr
May 22, 1:27 PM CDT	Severe Thunderstorm Watch	SPC	Carter, Comanche, Cotton, Garvin, Jefferson, Love and 3 more	6 hr
May 22, 4:55 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Comanche and 17 more	2 hr
May 22, 6:20 PM CDT	Mesoscale Discussion	SPC	Cotton, Jefferson, Love	115 min

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.