Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 1737
The Storm Prediction Center issued this mesoscale discussion at Aug 10, 2012, 3:58 PM CDT for Beauregard Parish, Louisiana; 30 counties in Texas. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Aug 10, 2012, 3:58 PM CDT (20:58 UTC)
- Expired
- Aug 10, 2012, 5:30 PM CDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 31 counties
Beauregard Parish, LA, Austin County, TX, Bastrop County, TX, Bexar County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Colorado County, TX, Comal County, TX, Fayette County, TX, Gonzales County, TX, Grimes County, TX, Guadalupe County, TX, Hardin County, TX, Harris County, TX, Hays County, TX, Jasper County, TX, Kendall County, TX, Lavaca County, TX, Lee County, TX, Liberty County, TX, Montgomery County, TX, Newton County, TX, Polk County, TX, San Jacinto County, TX, Travis County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wilson County, TX
The radar
The Houston radar (KHGX), 128 km from the middle of the area, began a volume at 20:58 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, 9.0 hours before the alert went out and 277 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
- 2090 J/kg
- Mixed-layer CIN
- -90 J/kg
- Mixed-layer LCL
- 1009 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.4
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 |
|---|---|---|---|---|
| Aug 10, 4:31 PM CDT | Severe Thunderstorm Watch | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 5 more | 5 hr |
| Aug 10, 6:57 PM CDT | Mesoscale Discussion | SPC | Allen, Beauregard, Calcasieu, Cameron, Evangeline, Jefferson Davis | 63 min |
Nearby
Mesoscale Discussions in Texas, 2012Mesoscale Discussions in Louisiana, 2012Every mesoscale discussion in 2012
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.