Alert archive / Arkansas / Mesoscale Discussions in 2005

Mesoscale Discussion 497

April 5, 200537 counties in Arkansas

The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2005, 11:41 PM CDT for 37 counties in Arkansas. It was in force for 34 min.

The area

The outline as issued.

The facts

Issued: Apr 5, 2005, 11:41 PM CDT (04:41 UTC)
Expired: Apr 6, 2005, 12:15 AM CDT
In force: 34 min
Issued by: the Storm Prediction Center

All 37 counties

Arkansas County, AR, Baxter County, AR, Calhoun County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Faulkner County, AR, Fulton County, AR, Grant County, AR, Greene County, AR, Hot Spring County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR

The radar

The Little Rock radar (KLZK), 58 km from the middle of the area, began a volume at 04:42 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 nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 4.7 hours before the alert went out and 168 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: 571 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 1056 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.7

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 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, 12:46 PM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 17 more	119 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 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.