Alert archive / Texas / Mesoscale Discussions in 2005
Mesoscale Discussion 328
The Storm Prediction Center issued this mesoscale discussion at Mar 21, 2005, 8:29 PM CST for 4 states. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Mar 21, 2005, 8:29 PM CST (02:29 UTC)
- Expired
- Mar 21, 2005, 10:00 PM CST
- In force
- 91 min
- Issued by
- the Storm Prediction Center
All 79 counties
Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Grant County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Sevier County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Lincoln Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Choctaw County, OK, McCurtain County, OK, Anderson County, TX, Angelina County, TX, Austin County, TX, Bowie County, TX, Brazos County, TX, Camp County, TX, Cass County, TX, Chambers County, TX, Cherokee County, TX, Delta County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Houston County, TX, Jasper County, TX, Jefferson County, TX, Lamar County, TX, Leon County, TX, Liberty County, TX, Madison County, TX, Marion County, TX, Montgomery County, TX, Morris County, TX, Nacogdoches County, TX, Newton County, TX, Panola County, TX, Polk County, TX, Rains County, TX, Red River County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Trinity County, TX, Tyler County, TX, Upshur County, TX, Van Zandt County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wood County, TX
The radar
The Shreveport radar (KSHV), 56 km from the middle of the area, began a volume at 02:28 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.
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 00:00Z, 2.5 hours before the alert went out and 212 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.
- Mixed-layer CAPE
- 1017 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 845 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 104 m²/s²
- 0-3 km storm-relative helicity
- 252 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 5.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 21, 9:20 PM CST | Tornado Watch | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 11 more | 7 hr |
| 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 |
| Mar 21, 6:59 PM CST | Mesoscale Discussion | SPC | Atoka, Cherokee, Coal, Creek, Haskell, Hughes and 20 more | 2 hr |
Nearby
Mesoscale Discussions in Texas, 2005Mesoscale Discussions in Arkansas, 2005Mesoscale Discussions in Louisiana, 2005Every 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.