Alert archive / Arkansas / Mesoscale Discussions in 2005

Mesoscale Discussion 183

February 20, 200548 counties in Arkansas; Dunklin County, McDonald County, Missouri; 15 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Feb 20, 2005, 11:22 PM CST for 48 counties in Arkansas; Dunklin County, McDonald County, Missouri; 15 counties in Oklahoma. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Feb 20, 2005, 11:22 PM CST (05:22 UTC)
Expired: Feb 21, 2005, 1:15 AM CST
In force: 113 min
Issued by: the Storm Prediction Center

All 65 counties

Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Clay County, AR, Cleburne County, AR, Conway County, AR, Craighead County, AR, Crawford County, AR, Crittenden County, AR, Cross County, AR, Faulkner County, AR, Franklin County, AR, Fulton County, AR, Garland County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Johnson County, AR, Lawrence County, AR, Lee County, AR, Logan County, AR, Lonoke County, AR, Madison County, AR, Marion County, AR, Mississippi County, AR, Monroe County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Poinsett County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Dunklin County, MO, McDonald County, MO, Adair County, OK, Cherokee County, OK, Creek County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Okmulgee County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK

The radar

The Western Arkansas radar (KSRX), 78 km from the middle of the area, began a volume at 05:25 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, 5.4 hours before the alert went out and 127 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: 424 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1413 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 20, 8:51 PM CST	Mesoscale Discussion	SPC	Baxter, Boone, Carroll, Cleburne, Conway, Crawford and 27 more	114 min
Feb 20, 9:10 PM CST	Severe Thunderstorm Watch	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 29 more	6 hr
Feb 21, 12:30 AM CST	Severe Thunderstorm Watch	SPC	Clay, Craighead, Crittenden, Cross, Greene, Jackson and 8 more	6 hr
Feb 21, 2:10 AM CST	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Clay, Cleburne and 43 more	95 min
Feb 21, 2:30 AM CST	Severe Thunderstorm Watch	SPC	Baxter, Boone, Cleburne, Conway, Fulton, Independence and 11 more	4 hr
Feb 21, 4:29 AM CST	Mesoscale Discussion	SPC	Baxter, Boone, Clay, Cleburne, Conway, Craighead and 16 more	2 hr
Feb 21, 5:45 AM CST	Severe Thunderstorm Watch	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more	3 hr
Feb 21, 7:50 AM CST	Mesoscale Discussion	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more	55 min
Feb 21, 3:58 PM CST	Mesoscale Discussion	SPC	Arkansas, Desha, Drew, Jefferson, Lincoln, Phillips	92 min

Nearby

Mesoscale Discussions in Arkansas, 2005 Mesoscale Discussions in Oklahoma, 2005 Mesoscale Discussions in Missouri, 2005 Every mesoscale discussion in 2005

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.