Alert archive / Arkansas / Mesoscale Discussions in 2020

Mesoscale Discussion 676

May 22, 202014 counties in Arkansas; 14 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 22, 2020, 7:17 PM CDT for 14 counties in Arkansas; 14 counties in Oklahoma. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued
May 22, 2020, 7:17 PM CDT (00:17 UTC)
Expired
May 22, 2020, 8:15 PM CDT
In force
58 min
Issued by
the Storm Prediction Center
Concerning
Severe potential...watch likely
Chance of a watch
95%
All 28 counties

Crawford County, AR, Franklin County, AR, Garland County, AR, Howard County, AR, Johnson County, AR, Logan County, AR, Montgomery County, AR, Pike County, AR, Polk County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Washington County, AR, Yell County, AR, Adair County, OK, Cherokee County, OK, Choctaw County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, McIntosh County, OK, Muskogee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pushmataha County, OK, Sequoyah County, OK, Wagoner County, OK

The radar

The Western Arkansas radar (KSRX), 53 km from the middle of the area, began a volume at 00:19 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

Springfield, MO (KSGF), launched 00:00Z, 0.3 hours before the alert went out and 238 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-pSkew-T log-p diagram, Springfield, MO at 00:00Z on 2020-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 353 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 00:00Z on 2020-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 191 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

IssuedProductOfficeCountiesLasted
May 22, 7:34 PM CDTSevere Thunderstorm WatchSPCClark, Cleveland, Conway, Crawford, Dallas, Faulkner and 27 more8 hr
May 22, 9:14 PM CDTMesoscale DiscussionSPCConway, Crawford, Faulkner, Franklin, Garland, Johnson and 9 more91 min
May 22, 11:56 PM CDTMesoscale DiscussionSPCConway, Crawford, Faulkner, Franklin, Garland, Grant and 12 more2 hr
May 23, 11:56 AM CDTMesoscale DiscussionSPCAshley, Chicot94 min
May 22, 7:00 PM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Caddo, Carter, Cleveland, Coal and 16 more8 hr
May 22, 9:26 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Caddo, Carter, Cleveland, Coal and 16 more2 hr
May 23, 2:18 PM CDTMesoscale DiscussionSPCBeaver, Ellis, Harper, Roger Mills117 min
May 23, 3:06 PM CDTSevere Thunderstorm WatchSPCBeaver, Beckham, Ellis, Greer, Harmon, Jackson and 1 more7 hr
May 23, 5:25 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Ellis, Greer, Harmon, Jackson and 1 more2 hr

Nearby

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