Alert archive / Texas / Mesoscale Discussions in 2009
Mesoscale Discussion 2156
The Storm Prediction Center issued this mesoscale discussion at Oct 29, 2009, 10:48 AM CDT for 13 parishes in Louisiana; 71 counties in Texas. It was in force for 117 min.
The area
The outline as issued.
The facts
- Issued
- Oct 29, 2009, 10:48 AM CDT (15:48 UTC)
- Expired
- Oct 29, 2009, 12:45 PM CDT
- In force
- 117 min
- Issued by
- the Storm Prediction Center
All 84 counties
Allen Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, De Soto Parish, LA, Grant Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Winn Parish, LA, Anderson County, TX, Angelina County, TX, Bell County, TX, Bosque County, TX, Brazos County, TX, Burleson County, TX, Burnet County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Collin County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Falls County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Grayson County, TX, Gregg County, TX, Grimes County, TX, Hardin County, TX, Harrison County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Houston County, TX, Hunt County, TX, Jasper County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Lampasas County, TX, Lee County, TX, Leon County, TX, Liberty County, TX, Limestone County, TX, Madison County, TX, Marion County, TX, McLennan County, TX, Milam County, TX, Montgomery County, TX, Morris County, TX, Nacogdoches County, TX, Navarro County, TX, Newton County, TX, Panola County, TX, Polk County, TX, Rains County, TX, Red River County, TX, Robertson County, TX, Rockwall County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Smith County, TX, Tarrant 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, Williamson County, TX, Wood County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 177 km from the middle of the area, began a volume at 15:51 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, 3.8 hours before the alert went out and 187 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
- 387 J/kg
- Mixed-layer CIN
- -88 J/kg
- Mixed-layer LCL
- 453 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 350 m²/s²
- 0-3 km storm-relative helicity
- 422 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.7
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 |
|---|---|---|---|---|
| Oct 29, 1:14 PM CDT | Tornado Watch | SPC | Beauregard, Bienville, Bossier, Caddo, Caldwell, Claiborne and 13 more | 8 hr |
| Oct 29, 3:03 PM CDT | Mesoscale Discussion | SPC | Beauregard, Bienville, Bossier, Caddo, Calcasieu, Claiborne and 10 more | 117 min |
| Oct 29, 5:24 PM CDT | Mesoscale Discussion | SPC | Beauregard, Bienville, Bossier, Caddo, Caldwell, Claiborne and 13 more | 66 min |
| Oct 28, 7:12 PM CDT | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 11 more | 93 min |
| Oct 29, 1:07 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Bosque, Callahan, Clay, Collin and 25 more | 53 min |
| Oct 29, 1:19 AM CDT | Tornado Watch | SPC | Collin, Cooke, Dallas, Delta, Denton, Ellis and 18 more | 6 hr |
| Oct 29, 1:59 AM CDT | Tornado Watch | SPC | Archer, Baylor, Callahan, Clay, Eastland, Erath and 17 more | 5 hr |
| Oct 29, 3:40 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Callahan, Clay, Collin, Cooke and 29 more | 95 min |
| Oct 29, 5:19 AM CDT | Mesoscale Discussion | SPC | Austin, Brazos, Burleson, Chambers, Fort Bend, Grimes and 13 more | 86 min |
| Oct 29, 5:31 AM CDT | Mesoscale Discussion | SPC | Collin, Cooke, Dallas, Denton, Fannin, Grayson and 7 more | 89 min |
| Oct 29, 11:51 AM CDT | Tornado Watch | SPC | Anderson, Bell, Camp, Cherokee, Collin, Dallas and 30 more | 6 hr |
| Oct 29, 1:57 PM CDT | Mesoscale Discussion | SPC | Anderson, Bell, Delta, Ellis, Falls, Fannin and 19 more | 2 hr |
| Oct 29, 5:03 PM CDT | Mesoscale Discussion | SPC | Anderson, Camp, Cherokee, Delta, Franklin, Freestone and 16 more | 57 min |
Nearby
Mesoscale Discussions in Texas, 2009Mesoscale Discussions in Louisiana, 2009Every mesoscale discussion in 2009
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.