Alert archive / Texas / Mesoscale Discussions in 2005
Mesoscale Discussion 326
The Storm Prediction Center issued this mesoscale discussion at Mar 21, 2005, 5:10 PM CST for 7 counties in Arkansas; 9 parishes in Louisiana; 61 counties in Texas. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Mar 21, 2005, 5:10 PM CST (23:10 UTC)
- Expired
- Mar 21, 2005, 6:45 PM CST
- In force
- 95 min
- Issued by
- the Storm Prediction Center
All 77 counties
Columbia County, AR, Hempstead County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Natchitoches Parish, LA, Red River Parish, LA, Sabine Parish, LA, Webster Parish, LA, Anderson County, TX, Angelina County, TX, Austin County, TX, Bowie County, TX, Brazoria County, TX, Brazos County, TX, Burleson County, TX, Camp County, TX, Cass County, TX, Chambers County, TX, Cherokee County, TX, Colorado County, TX, Delta County, TX, DeWitt County, TX, Fayette County, TX, Fort Bend 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, Lavaca County, TX, Lee 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, Orange County, TX, Panola County, TX, Polk County, TX, Rains County, TX, Red River County, TX, Robertson 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, Wharton County, TX, Wood County, TX
The radar
The Shreveport radar (KSHV), 177 km from the middle of the area, began a volume at 23:09 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
Shreveport, LA (KSHV), launched 12:00Z, 11.2 hours before the alert went out and 185 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 481 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 99 m²/s²
- 0-3 km storm-relative helicity
- 204 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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, 5:40 PM CST | Tornado Watch | SPC | Hempstead, Howard, Lafayette, Little River, Miller, Pike and 1 more | 7 hr |
| Mar 21, 3:39 AM CST | Mesoscale Discussion | SPC | Bosque, Clay, Collin, Comanche, Cooke, Dallas and 26 more | 3 hr |
| Mar 21, 6:05 AM CST | Severe Thunderstorm Watch | SPC | Bastrop, Bell, Blanco, Bosque, Brown, Burnet and 59 more | 6 hr |
| Mar 21, 7:43 AM CST | Mesoscale Discussion | SPC | Bastrop, Bell, Blanco, Bosque, Brown, Burleson and 60 more | 92 min |
| Mar 21, 9:26 AM CST | Mesoscale Discussion | SPC | Anderson, Bastrop, Bell, Blanco, Bosque, Burleson and 57 more | 34 min |
| Mar 21, 10:57 AM CST | Mesoscale Discussion | SPC | Atascosa, Austin, Bastrop, Bexar, Brazoria, Caldwell and 27 more | 33 min |
| Mar 21, 2:59 PM CST | Mesoscale Discussion | SPC | Anderson, Camp, Cherokee, Delta, Falls, Fannin and 18 more | 3 hr |
Nearby
Mesoscale Discussions in Texas, 2005Mesoscale Discussions in Louisiana, 2005Mesoscale Discussions in Arkansas, 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.