Alert archive / Louisiana / Tornado Watches in 2005

Tornado Watch 58

March 21, 200517 counties in Arkansas; 21 parishes in Louisiana

The Storm Prediction Center issued this tornado watch at Mar 21, 2005, 9:20 PM CST for 17 counties in Arkansas; 21 parishes in Louisiana. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Mar 21, 2005, 9:20 PM CST (03:20 UTC)
Expired: Mar 22, 2005, 4:00 AM CST
In force: 7 hr
Issued by: the Storm Prediction Center

All 38 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Hot Spring County, AR, Jefferson County, AR, Lincoln County, AR, Ouachita County, AR, Phillips County, AR, Union County, AR, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA

The radar

The Shreveport radar (KSHV), 116 km from the middle of the area, began a volume at 03:24 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.

Warnings issued inside it

17 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Mar 21, 10:10 PM CST	Severe Thunderstorm Warning	SHV	Columbia	65 min
Mar 21, 10:22 PM CST	Severe Thunderstorm Warning	SHV	Bienville	53 min
Mar 21, 10:32 PM CST	Tornado Warning	SHV	Bienville	28 min
Mar 21, 10:58 PM CST	Severe Thunderstorm Warning	SHV	Lincoln	62 min
Mar 21, 11:02 PM CST	Severe Thunderstorm Warning	SHV	Jackson	58 min
Mar 21, 11:18 PM CST	Severe Thunderstorm Warning	SHV	Claiborne, Webster	57 min
Mar 21, 11:20 PM CST	Severe Thunderstorm Warning	SHV	Columbia	40 min
Mar 21, 11:36 PM CST	Severe Thunderstorm Warning	SHV	Ouachita, Union	54 min
Mar 22, 12:07 AM CST	Severe Thunderstorm Warning	JAN	Morehouse	68 min
Mar 22, 12:44 AM CST	Severe Thunderstorm Warning	JAN	Ashley	61 min
Mar 22, 12:49 AM CST	Severe Thunderstorm Warning	SHV	Natchitoches	56 min
Mar 22, 1:21 AM CST	Severe Thunderstorm Warning	SHV	Winn	54 min
Mar 22, 1:22 AM CST	Severe Thunderstorm Warning	JAN	Chicot	53 min
Mar 22, 2:17 AM CST	Severe Thunderstorm Warning	SHV	Sabine	58 min
Mar 22, 2:46 AM CST	Severe Thunderstorm Warning	SHV	Natchitoches	59 min
Mar 22, 3:03 AM CST	Severe Thunderstorm Warning	SHV	Winn	57 min
Mar 22, 3:05 AM CST	Severe Thunderstorm Warning	JAN	Franklin, Richland	55 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 3.3 hours before the alert went out and 239 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: 18 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 1125 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 21, 8:29 PM CST	Mesoscale Discussion	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 11 more	91 min
Mar 21, 10:12 PM CST	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Crawford, Franklin, Johnson and 8 more	63 min
Mar 21, 10:15 PM CST	Severe Thunderstorm Watch	SPC	Benton, Carroll, Crawford, Franklin, Logan, Madison and 5 more	6 hr
Mar 21, 11:09 PM CST	Mesoscale Discussion	SPC	Hempstead, Howard, Lafayette, Little River, Miller, Pike and 1 more	96 min
Mar 21, 11:26 PM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 10 more	94 min
Mar 22, 1:45 AM CST	Tornado Watch	SPC	Ashley, Bradley, Chicot, Union	6 hr
Mar 22, 2:20 AM CST	Mesoscale Discussion	SPC	Benton, Carroll, Crawford, Franklin, Logan, Madison and 5 more	85 min
Mar 22, 3:57 AM CST	Mesoscale Discussion	SPC	Ashley, Bradley, Chicot, Union	2 hr
Mar 22, 11:55 AM CST	Mesoscale Discussion	SPC	Arkansas, Chicot, Cleburne, Conway, Crittenden, Cross and 20 more	95 min
Mar 22, 12:55 PM CST	Severe Thunderstorm Watch	SPC	Arkansas, Baxter, Boone, Chicot, Clay, Cleburne and 29 more	7 hr
Mar 22, 2:39 PM CST	Mesoscale Discussion	SPC	Baxter, Cleburne, Craighead, Crittenden, Cross, Faulkner and 19 more	96 min
Mar 22, 4:27 PM CST	Mesoscale Discussion	SPC	Clay, Mississippi	33 min
Mar 22, 12:50 AM CST	Tornado Watch	SPC	De Soto, Sabine	5 hr
Mar 22, 3:00 AM CST	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 13 more	5 hr
Mar 22, 3:43 AM CST	Mesoscale Discussion	SPC	De Soto, Sabine	2 hr
Mar 22, 5:59 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Calcasieu, Cameron, East Baton Rouge and 14 more	2 hr
Mar 22, 6:55 AM CST	Tornado Watch	SPC	Saint Tammany, Washington	6 hr

Nearby

Tornado Watches in Louisiana, 2005 Tornado Watches in Arkansas, 2005 Every tornado watch 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.