Alert archive / Texas / Mesoscale Discussions in 2009
Mesoscale Discussion 259
The Storm Prediction Center issued this mesoscale discussion at Mar 25, 2009, 12:51 PM CDT for 54 counties in Texas. It was in force for 114 min.
The area
The outline as issued.
The facts
- Issued
- Mar 25, 2009, 12:51 PM CDT (17:51 UTC)
- Expired
- Mar 25, 2009, 2:45 PM CDT
- In force
- 114 min
- Issued by
- the Storm Prediction Center
All 54 counties
Atascosa County, TX, Austin County, TX, Bandera County, TX, Bastrop County, TX, Bexar County, TX, Blanco County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Chambers County, TX, Colorado County, TX, Comal County, TX, DeWitt County, TX, Edwards County, TX, Fayette County, TX, Fort Bend County, TX, Frio County, TX, Gillespie County, TX, Gonzales County, TX, Grimes County, TX, Guadalupe County, TX, Harris County, TX, Hays County, TX, Houston County, TX, Karnes County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, Lavaca County, TX, Lee County, TX, Liberty County, TX, Llano County, TX, Madison County, TX, Mason County, TX, Medina County, TX, Milam County, TX, Montgomery County, TX, Polk County, TX, Real County, TX, Robertson County, TX, San Jacinto County, TX, Sutton County, TX, Travis County, TX, Trinity County, TX, Uvalde County, TX, Val Verde County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX, Williamson County, TX, Wilson County, TX, Zavala County, TX
The radar
The Austin/San Antonio radar (KEWX), 64 km from the middle of the area, began a volume at 17:50 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
Del Rio, TX (KDRT), launched 12:00Z, 5.9 hours before the alert went out and 236 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
- 1215 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 976 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 149 m²/s²
- 0-3 km storm-relative helicity
- 223 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.4
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 24, 7:30 PM CDT | Mesoscale Discussion | SPC | Angelina, Nacogdoches, Sabine, San Augustine, Shelby | 2 hr |
| Mar 24, 11:25 PM CDT | Tornado Watch | SPC | Jasper, Newton, Sabine, San Augustine, Tyler | 5 hr |
| Mar 25, 10:55 AM CDT | Mesoscale Discussion | SPC | Anderson, Bell, Blanco, Bosque, Brown, Burleson and 40 more | 65 min |
| Mar 25, 11:27 AM CDT | Severe Thunderstorm Watch | SPC | Bell, Bosque, Brown, Callahan, Coke, Coleman and 47 more | 7 hr |
| Mar 25, 1:48 PM CDT | Mesoscale Discussion | SPC | Bosque, Brown, Callahan, Coleman, Collin, Comanche and 31 more | 87 min |
| Mar 25, 2:06 PM CDT | Tornado Watch | SPC | Anderson, Bandera, Bastrop, Bexar, Blanco, Brazos and 36 more | 7 hr |
| Mar 25, 2:42 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Delta, Franklin, Gregg and 11 more | 93 min |
| Mar 25, 3:47 PM CDT | Mesoscale Discussion | SPC | Coryell, Ellis, Falls, Freestone, Henderson, Hill and 8 more | 88 min |
| Mar 25, 3:57 PM CDT | Mesoscale Discussion | SPC | Bandera, Bastrop, Bexar, Blanco, Brazos, Burleson and 31 more | 93 min |
| Mar 25, 5:29 PM CDT | Mesoscale Discussion | SPC | Angelina, Brazos, Burleson, Grimes, Houston, Jasper and 15 more | 91 min |
| Mar 25, 5:40 PM CDT | Tornado Watch | SPC | Angelina, Cherokee, Gregg, Harrison, Jasper, Marion and 8 more | 6 hr |
Nearby
Mesoscale Discussions in Texas, 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.