Alert archive / Texas / Mesoscale Discussions in 2015
Mesoscale Discussion 2005
The Storm Prediction Center issued this mesoscale discussion at Dec 12, 2015, 2:16 PM CST for 44 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 12, 2015, 2:16 PM CST (20:16 UTC)
- Expired
- Dec 12, 2015, 4:45 PM CST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 44 counties
Anderson County, TX, Angelina County, TX, Brazoria County, TX, Camp County, TX, Cass County, TX, Chambers County, TX, Cherokee County, TX, Delta County, TX, Fort Bend County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Grimes County, TX, Harris County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Houston County, TX, Jackson County, TX, Kaufman County, TX, Leon County, TX, Liberty County, TX, Madison County, TX, Marion County, TX, Matagorda County, TX, Montgomery County, TX, Morris County, TX, Nacogdoches County, TX, Panola County, TX, Polk County, TX, Rains County, TX, Red River County, TX, Rusk County, TX, San Jacinto County, TX, Smith County, TX, Titus County, TX, Trinity County, TX, Tyler County, TX, Upshur County, TX, Van Zandt County, TX, Walker County, TX, Waller County, TX, Wharton County, TX, Wood County, TX
The radar
The Houston radar (KHGX), 144 km from the middle of the area, began a volume at 20:18 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 12:00Z, 8.3 hours before the alert went out and 233 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
- 351 J/kg
- Mixed-layer CIN
- -34 J/kg
- Mixed-layer LCL
- 540 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 204 m²/s²
- 0-3 km storm-relative helicity
- 295 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.6
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 |
|---|---|---|---|---|
| Dec 12, 3:43 PM CST | Mesoscale Discussion | SPC | Baylor, Borden, Briscoe, Childress, Coke, Collingsworth and 39 more | 2 hr |
| Dec 12, 5:13 PM CST | Severe Thunderstorm Watch | SPC | Armstrong, Baylor, Borden, Briscoe, Brown, Callahan and 60 more | 7 hr |
Nearby
Mesoscale Discussions in Texas, 2015Every mesoscale discussion in 2015
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.