Alert archive / Arkansas / Mesoscale Discussions in 2005

Mesoscale Discussion 2267

September 24, 20056 counties in Arkansas; 4 parishes in Louisiana; 6 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Sep 24, 2005, 12:49 PM CDT for 6 counties in Arkansas; 4 parishes in Louisiana; 6 counties in Texas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Sep 24, 2005, 12:49 PM CDT (17:49 UTC)
Expired: Sep 24, 2005, 3:45 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

Counties Columbia County, AR, Hempstead County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Bossier Parish, LA, Caddo Parish, LA, De Soto Parish, LA, Webster Parish, LA, Bowie County, TX, Cass County, TX, Harrison County, TX, Marion County, TX, Panola County, TX, Shelby County, TX

The radar

The Shreveport radar (KSHV), 20 km from the middle of the area, began a volume at 17:49 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, 5.8 hours before the alert went out and 21 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: 328 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 682 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.1

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
Sep 24, 12:30 PM CDT	Tornado Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 10 more	3 hr
Sep 24, 2:57 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 10 more	93 min
Sep 24, 3:55 PM CDT	Tornado Watch	SPC	Cleburne, Conway, Crittenden, Cross, Faulkner, Garland and 17 more	5 hr
Sep 24, 4:20 PM CDT	Tornado Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 10 more	5 hr
Sep 24, 6:07 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 33 more	83 min
Sep 24, 1:36 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, Iberia, Iberville, Jefferson, Lafayette and 9 more	54 min
Sep 24, 5:13 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 47 more	32 min
Sep 24, 5:45 AM CDT	Tornado Watch	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 45 more	7 hr
Sep 24, 10:27 AM CDT	Mesoscale Discussion	SPC	Acadia, Ascension, Assumption, Avoyelles, Bienville, Caldwell and 45 more	2 hr
Sep 23, 10:35 PM CDT	Tornado Watch	SPC	Hardin, Jasper, Jefferson, Newton, Orange, Tyler	7 hr

Nearby

Mesoscale Discussions in Arkansas, 2005 Mesoscale Discussions in Texas, 2005 Mesoscale Discussions in Louisiana, 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.