Alert archive / Arkansas / Mesoscale Discussions in 2006

Mesoscale Discussion 696

April 29, 200618 counties in Arkansas; 4 parishes in Louisiana

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2006, 6:26 PM CDT for 18 counties in Arkansas; 4 parishes in Louisiana. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Apr 29, 2006, 6:26 PM CDT (23:26 UTC)
Expired: Apr 29, 2006, 8:00 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center

All 22 counties

Bradley County, AR, Calhoun County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Dallas County, AR, Faulkner County, AR, Grant County, AR, Izard County, AR, Marion County, AR, Ouachita County, AR, Perry County, AR, Pulaski County, AR, Saline County, AR, Searcy County, AR, Stone County, AR, Union County, AR, Van Buren County, AR, Jackson Parish, LA, Lincoln Parish, LA, Ouachita Parish, LA, Union Parish, LA

The radar

The Little Rock radar (KLZK), 107 km from the middle of the area, began a volume at 23:27 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

Shreveport, LA (KSHV), launched 12:00Z, 11.4 hours before the alert went out and 192 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: 187 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 486 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 450 m²/s²
0-3 km storm-relative helicity: 573 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.6

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 28, 11:08 PM CDT	Tornado Watch	SPC	Howard, Little River, Miller, Sevier	7 hr
Apr 29, 4:03 AM CDT	Mesoscale Discussion	SPC	Howard, Little River, Miller, Sevier	57 min
Apr 29, 6:04 AM CDT	Tornado Watch	SPC	Columbia, Lafayette, Little River, Miller, Union	7 hr
Apr 29, 7:37 AM CDT	Mesoscale Discussion	SPC	Columbia, Lafayette, Little River, Miller, Union	83 min
Apr 29, 11:55 AM CDT	Mesoscale Discussion	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 4 more	65 min
Apr 29, 12:47 PM CDT	Tornado Watch	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Conway and 31 more	8 hr
Apr 29, 2:34 PM CDT	Mesoscale Discussion	SPC	Clark, Columbia, Crawford, Franklin, Garland, Hempstead and 17 more	86 min
Apr 29, 9:57 AM CDT	Mesoscale Discussion	SPC	Allen, Beauregard, Bienville, Calcasieu, Grant, Jackson and 7 more	2 hr
Apr 29, 5:43 PM CDT	Tornado Watch	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 16 more	6 hr

Nearby

Mesoscale Discussions in Arkansas, 2006 Mesoscale Discussions in Louisiana, 2006 Every mesoscale discussion in 2006

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.