Alert archive / Texas / Mesoscale Discussions in 2009
Mesoscale Discussion 294
The Storm Prediction Center issued this mesoscale discussion at Mar 27, 2009, 10:24 AM CDT for 49 counties in Texas. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Mar 27, 2009, 10:24 AM CDT (15:24 UTC)
- Expired
- Mar 27, 2009, 12:00 PM CDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
All 49 counties
Anderson County, TX, Angelina County, TX, Austin County, TX, Bastrop County, TX, Bell County, TX, Brazoria County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Chambers County, TX, Cherokee County, TX, Colorado County, TX, Falls County, TX, Fayette County, TX, Fort Bend County, TX, Freestone County, TX, Gonzales County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Henderson County, TX, Hill County, TX, Houston County, TX, Jasper County, TX, Jefferson County, TX, Lavaca County, TX, Lee County, TX, Leon County, TX, Liberty County, TX, Limestone County, TX, Madison County, TX, McLennan County, TX, Milam County, TX, Montgomery County, TX, Nacogdoches County, TX, Navarro County, TX, Polk County, TX, Robertson County, TX, Rusk County, TX, San Augustine County, TX, San Jacinto County, TX, Travis County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX, Williamson County, TX
The radar
The Ft Hood radar (KGRK), 132 km from the middle of the area, began a volume at 15:25 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 12:00Z, 3.4 hours before the alert went out and 274 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
- 1993 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 509 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- -15 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.2
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 26, 7:32 PM CDT | Severe Thunderstorm Watch | SPC | Cooke, Denton, Fannin, Grayson, Jack, Montague and 1 more | 4 hr |
| Mar 26, 9:13 PM CDT | Mesoscale Discussion | SPC | Angelina, Cherokee, Hardin, Jasper, Jefferson, Nacogdoches and 6 more | 92 min |
| Mar 26, 11:34 PM CDT | Mesoscale Discussion | SPC | Dallam, Hartley, Moore, Oldham, Sherman | 4 hr |
| Mar 27, 2:55 AM CDT | Mesoscale Discussion | SPC | Armstrong, Carson, Dallam, Deaf Smith, Hansford, Hartley and 9 more | 4 hr |
| Mar 27, 8:04 AM CDT | Mesoscale Discussion | SPC | Collingsworth, Donley, Gray, Hemphill, Lipscomb, Ochiltree and 2 more | 4 hr |
| Mar 27, 11:48 AM CDT | Severe Thunderstorm Watch | SPC | Austin, Brazos, Burleson, Chambers, Grimes, Hardin and 16 more | 5 hr |
| Mar 27, 12:30 PM CDT | Mesoscale Discussion | SPC | Carson, Childress, Collingsworth, Donley, Gray, Hansford and 8 more | 6 hr |
| Mar 27, 12:33 PM CDT | Mesoscale Discussion | SPC | Anderson, Bowie, Camp, Cass, Cherokee, Collin and 26 more | 57 min |
| Mar 27, 12:58 PM CDT | Tornado Watch | SPC | Anderson, Angelina, Bowie, Camp, Cass, Cherokee and 28 more | 7 hr |
| Mar 27, 3:34 PM CDT | Mesoscale Discussion | SPC | Anderson, Angelina, Bowie, Camp, Cass, Cherokee and 28 more | 56 min |
| Mar 27, 3:43 PM CDT | Mesoscale Discussion | SPC | Chambers, Hardin, Harris, Jasper, Jefferson, Liberty and 6 more | 62 min |
| Mar 27, 4:49 PM CDT | Tornado Watch | SPC | Brazoria, Chambers, Galveston, Hardin, Harris, Jasper and 6 more | 3 hr |
| Mar 27, 5:53 PM CDT | Mesoscale Discussion | SPC | Bowie, Cass | 97 min |
| Mar 27, 6:35 PM CDT | Tornado Watch | SPC | Angelina, Bowie, Camp, Cass, Cherokee, Gregg and 10 more | 7 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.