Alert archive / Arkansas / Mesoscale Discussions in 2005

Mesoscale Discussion 504

April 6, 200523 counties in Arkansas; 9 counties in Missouri; 5 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2005, 12:46 PM CDT for 23 counties in Arkansas; 9 counties in Missouri; 5 counties in Oklahoma. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Apr 6, 2005, 12:46 PM CDT (17:46 UTC)
Expired: Apr 6, 2005, 2:45 PM CDT
In force: 119 min
Issued by: the Storm Prediction Center

All 37 counties

Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Cleburne County, AR, Conway County, AR, Crawford County, AR, Franklin County, AR, Fulton County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Johnson County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Pope County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, White County, AR, Barry County, MO, Christian County, MO, Douglas County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Ozark County, MO, Stone County, MO, Taney County, MO, Adair County, OK, Cherokee County, OK, Delaware County, OK, Ottawa County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 123 km from the middle of the area, began a volume at 17:50 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.

Tornado Watch 133Apr 6, 1:55 PM CDT

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 5.8 hours before the alert went out and 342 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: 74 J/kg
Mixed-layer CIN: -186 J/kg
Mixed-layer LCL: 848 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 258 m²/s²
0-3 km storm-relative helicity: 320 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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
Apr 5, 8:25 PM CDT	Severe Thunderstorm Watch	SPC	Columbia, Hempstead, Lafayette, Little River, Miller, Nevada and 1 more	8 hr
Apr 5, 8:30 PM CDT	Severe Thunderstorm Watch	SPC	Baxter, Benton, Boone, Carroll, Clark, Conway and 27 more	5 hr
Apr 5, 10:40 PM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Union	2 hr
Apr 5, 11:41 PM CDT	Mesoscale Discussion	SPC	Arkansas, Baxter, Calhoun, Cleburne, Cleveland, Conway and 31 more	34 min
Apr 6, 7:46 AM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 30 more	119 min
Apr 6, 10:40 AM CDT	Mesoscale Discussion	SPC	Ashley, Chicot, Desha, Drew	65 min
Apr 6, 1:55 PM CDT	Tornado Watch	SPC	Baxter, Clay, Cleburne, Craighead, Crittenden, Cross and 19 more	7 hr
Apr 6, 3:18 PM CDT	Mesoscale Discussion	SPC	Baxter, Clay, Cleburne, Craighead, Crittenden, Cross and 19 more	87 min
Apr 6, 5:44 PM CDT	Mesoscale Discussion	SPC	Arkansas, Baxter, Clay, Cleburne, Craighead, Crittenden and 20 more	91 min

Nearby

Mesoscale Discussions in Arkansas, 2005 Mesoscale Discussions in Missouri, 2005 Mesoscale Discussions in Oklahoma, 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.