Alert archive / Texas / Mesoscale Discussions in 2009
Mesoscale Discussion 265
The Storm Prediction Center issued this mesoscale discussion at Mar 25, 2009, 7:31 PM CDT for 15 counties in Texas. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- Mar 25, 2009, 7:31 PM CDT (00:31 UTC)
- Expired
- Mar 25, 2009, 8:30 PM CDT
- In force
- 59 min
- Issued by
- the Storm Prediction Center
Counties Austin County, TX, Brazos County, TX, Burleson County, TX, Fayette County, TX, Grimes County, TX, Harris County, TX, Houston County, TX, Madison County, TX, Montgomery County, TX, Polk County, TX, San Jacinto County, TX, Trinity County, TX, Walker County, TX, Waller County, TX, Washington County, TX
The radar
The Houston radar (KHGX), 123 km from the middle of the area, began a volume at 00:32 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 nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 00:00Z, 0.5 hours before the alert went out and 244 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
- 3131 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 474 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 130 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 2.5
- Supercell composite
- 9.3
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 25, 7:12 PM CDT | Tornado Watch | SPC | Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 9 more | 6 hr |
| Mar 26, 9:14 AM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bexar, Blanco, Caldwell, Comal and 16 more | 31 min |
| Mar 26, 9:39 AM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 25 more | 5 hr |
| Mar 26, 12:43 PM CDT | Mesoscale Discussion | SPC | Aransas, Atascosa, Bee, Brazoria, Calhoun, DeWitt and 11 more | 62 min |
| Mar 26, 12:57 PM CDT | Severe Thunderstorm Watch | SPC | Aransas, Bee, Brazoria, Calhoun, Chambers, Duval and 17 more | 6 hr |
| Mar 26, 3:06 PM CDT | Mesoscale Discussion | SPC | Hardin, Jasper, Jefferson, Newton, Orange, Tyler | 54 min |
| Mar 26, 3:51 PM CDT | Mesoscale Discussion | SPC | Aransas, Brazoria, Calhoun, Chambers, Fort Bend, Galveston and 8 more | 54 min |
| Mar 26, 3:57 PM CDT | Tornado Watch | SPC | Angelina, Cherokee, Hardin, Jasper, Jefferson, Nacogdoches and 6 more | 7 hr |
| Mar 26, 4:52 PM CDT | Mesoscale Discussion | SPC | Archer, Clay, Comanche, Eastland, Erath, Hamilton and 9 more | 83 min |
| Mar 26, 6:32 PM CDT | Mesoscale Discussion | SPC | Dallam | 4 hr |
| Mar 26, 6:56 PM CDT | Mesoscale Discussion | SPC | Angelina, Cherokee, Hardin, Jasper, Jefferson, Nacogdoches and 6 more | 94 min |
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.