Alert archive / Arkansas / Mesoscale Discussions in 2019

Mesoscale Discussion 707

May 20, 20194 states

The Storm Prediction Center issued this mesoscale discussion at May 20, 2019, 4:35 PM CDT for 4 states. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued
May 20, 2019, 4:35 PM CDT (21:35 UTC)
Expired
May 20, 2019, 6:30 PM CDT
In force
115 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 61 counties

Benton County, AR, Boone County, AR, Bradley County, AR, Calhoun County, AR, Carroll County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Crawford County, AR, Dallas County, AR, Drew County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Johnson County, AR, Lincoln County, AR, Logan County, AR, Lonoke County, AR, Madison County, AR, Marion County, AR, Montgomery County, AR, Nevada County, AR, Newton County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Van Buren County, AR, Washington County, AR, White County, AR, Yell County, AR, Cherokee County, KS, Crawford County, KS, Labette County, KS, Barry County, MO, Jasper County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Stone County, MO, Taney County, MO, Adair County, OK, Cherokee County, OK, Craig County, OK, Delaware County, OK, Mayes County, OK, Ottawa County, OK, Rogers County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 57 km from the middle of the area, began a volume at 21:36 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 12:00Z, 9.6 hours before the alert went out and 172 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 12:00Z on 2019-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 2019-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 116 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1201 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
116 m²/s²
0-3 km storm-relative helicity
181 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.

IssuedProductOfficeCountiesLasted
May 19, 7:21 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Desha and 4 more84 min
May 20, 5:14 PM CDTTornado WatchSPCBaxter, Benton, Boone, Carroll, Clark, Cleburne and 27 more8 hr
May 20, 7:09 AM CDTSevere Thunderstorm WatchSPCBarber, Chautauqua, Comanche, Cowley, Elk, Harper and 5 more6 hr
May 20, 11:35 AM CDTMesoscale DiscussionSPCBarber, Chautauqua, Comanche, Cowley, Elk, Harper and 5 more85 min
May 20, 2:15 PM CDTMesoscale DiscussionSPCBarber, Clark, Comanche, Harper, Kingman, Sumner90 min
May 19, 11:56 PM CDTMesoscale DiscussionSPCCimarron2 hr
May 20, 1:57 AM CDTSevere Thunderstorm WatchSPCBeaver, Cimarron, Texas8 hr
May 20, 6:14 AM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Custer, Dewey, Ellis, Garfield and 7 more2 hr
May 20, 10:41 AM CDTMesoscale DiscussionSPCBeckham, Greer, Harmon, Jackson, Roger Mills3 hr
May 20, 11:17 AM CDTMesoscale DiscussionSPCBeckham, Blaine, Caddo, Canadian, Carter, Cleveland and 20 more2 hr
May 20, 1:21 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Cleveland, Comanche, Grady, Kiowa and 3 more24 min
May 20, 1:37 PM CDTTornado Watch PDSSPCAtoka, Beckham, Blaine, Bryan, Caddo, Canadian and 41 more8 hr
May 20, 3:46 PM CDTMesoscale DiscussionSPCCanadian, Greer, Harmon, Jackson, Kingfisher, Kiowa and 1 more59 min
May 20, 5:44 PM CDTMesoscale DiscussionSPCCanadian, Greer, Harmon, Jackson, Kingfisher, Kiowa and 1 more61 min

Nearby

Mesoscale Discussions in Arkansas, 2019Mesoscale Discussions in Oklahoma, 2019Mesoscale Discussions in Missouri, 2019Every mesoscale discussion in 2019

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.