Alert archive / Arkansas / Mesoscale Discussions in 2019

Mesoscale Discussion 873

May 29, 201920 counties in Arkansas; Taney County, Missouri; 10 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 29, 2019, 1:07 AM CDT for 20 counties in Arkansas; Taney County, Missouri; 10 counties in Oklahoma. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: May 29, 2019, 1:07 AM CDT (06:07 UTC)
Expired: May 29, 2019, 3:00 AM CDT
In force: 113 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 31 counties

Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Polk County, AR, Pope County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, Yell County, AR, Taney County, MO, Adair County, OK, Cherokee County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McIntosh County, OK, Muskogee County, OK, Pittsburg County, OK, Pushmataha County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 24 km from the middle of the area, began a volume at 06:10 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, 6.1 hours before the alert went out and 162 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: 1084 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 1074 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.8

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 29, 1:39 AM CDT	Severe Thunderstorm Watch	SPC	Crawford, Franklin, Madison, Sebastian, Washington	3 hr
May 29, 3:11 AM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Crawford, Franklin, Izard, Johnson and 8 more	94 min
May 29, 3:11 AM CDT	Severe Thunderstorm Watch	SPC	Baxter, Boone, Cleburne, Conway, Fulton, Independence and 13 more	5 hr
May 29, 6:06 AM CDT	Severe Thunderstorm Watch	SPC	Clay, Craighead, Greene, Mississippi, Poinsett	2 hr
May 29, 9:40 AM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Crawford, Madison, Washington	65 min
May 29, 10:04 AM CDT	Severe Thunderstorm Watch	SPC	Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more	7 hr
May 29, 12:18 PM CDT	Mesoscale Discussion	SPC	Clark, Franklin, Garland, Hempstead, Hot Spring, Howard and 13 more	87 min
May 29, 12:46 PM CDT	Tornado Watch	SPC	Baxter, Boone, Carroll, Cleburne, Conway, Crawford and 32 more	9 hr
May 29, 1:32 PM CDT	Mesoscale Discussion	SPC	Benton, Washington	58 min
May 29, 3:12 PM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Carroll, Cleburne, Conway, Crawford and 29 more	63 min
May 29, 6:22 PM CDT	Tornado Watch	SPC	Calhoun, Clark, Cleveland, Columbia, Dallas, Faulkner and 22 more	7 hr
May 28, 9:36 PM CDT	Severe Thunderstorm Watch	SPC	Andrew, Atchison, Buchanan, Caldwell, Carroll, Cass and 17 more	4 hr
May 28, 9:52 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, Caldwell, Clay, Clinton and 12 more	53 min
May 29, 3:48 PM CDT	Mesoscale Discussion	SPC	Bollinger, Cape Girardeau, Franklin, Gasconade, Iron, Jefferson and 14 more	87 min
May 29, 4:34 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Callaway, Cole, Crawford, Franklin, Gasconade and 15 more	3 hr
May 28, 8:05 PM CDT	Mesoscale Discussion	SPC	Caddo, Canadian, Cleveland, Comanche, Creek, Garfield and 14 more	85 min
May 29, 7:31 AM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Cleveland, Coal and 19 more	119 min

Nearby

Mesoscale Discussions in Arkansas, 2019 Mesoscale Discussions in Oklahoma, 2019 Mesoscale Discussions in Missouri, 2019 Every 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.