Alert archive / Texas / Mesoscale Discussions in 2009
Mesoscale Discussion 92
The Storm Prediction Center issued this mesoscale discussion at Feb 10, 2009, 9:46 PM CST for 19 counties in Texas. It was in force for 29 min.
The area
The outline as issued.
The facts
- Issued
- Feb 10, 2009, 9:46 PM CST (03:46 UTC)
- Expired
- Feb 10, 2009, 10:15 PM CST
- In force
- 29 min
- Issued by
- the Storm Prediction Center
Counties Austin County, TX, Brazoria County, TX, Calhoun County, TX, Chambers County, TX, Colorado County, TX, DeWitt County, TX, Fayette County, TX, Fort Bend County, TX, Goliad County, TX, Gonzales County, TX, Harris County, TX, Jackson County, TX, Karnes County, TX, Lavaca County, TX, Matagorda County, TX, Victoria County, TX, Waller County, TX, Washington County, TX, Wharton County, TX
The radar
The Houston radar (KHGX), 98 km from the middle of the area, began a volume at 03:49 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
Corpus Christi, TX (KCRP), launched 00:00Z, 3.8 hours before the alert went out and 224 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
- 1589 J/kg
- Mixed-layer CIN
- -102 J/kg
- Mixed-layer LCL
- 688 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 226 m²/s²
- 0-3 km storm-relative helicity
- 237 m²/s²
- Significant tornado parameter
- 1.5
- Supercell composite
- 6.6
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 |
|---|---|---|---|---|
| Feb 10, 6:13 PM CST | Mesoscale Discussion | SPC | Clay, Cooke, Jack, Montague, Palo Pinto, Stephens and 2 more | 92 min |
| Feb 10, 7:18 PM CST | Mesoscale Discussion | SPC | Brown, Comanche, Eastland, Erath, Jack, McCulloch and 4 more | 57 min |
| Feb 10, 8:34 PM CST | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Delta, Franklin, Gregg and 12 more | 86 min |
| Feb 10, 9:30 PM CST | Tornado Watch | SPC | Anderson, Angelina, Bowie, Brazos, Burleson, Camp and 47 more | 7 hr |
| Feb 10, 9:57 PM CST | Severe Thunderstorm Watch | SPC | Aransas, Austin, Bastrop, Bee, Brazoria, Caldwell and 25 more | 5 hr |
| Feb 11, 1:04 AM CST | Tornado Watch | SPC | Hardin, Jasper, Newton, Sabine, Tyler | 5 hr |
| Feb 11, 4:01 AM CST | Mesoscale Discussion | SPC | Hardin, Jasper, Newton, Polk, Sabine, San Augustine and 2 more | 89 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.