Alert archive / Texas / Mesoscale Discussions in 2018
Mesoscale Discussion 1730
The Storm Prediction Center issued this mesoscale discussion at Dec 26, 2018, 8:51 PM CST for 24 counties in Texas. It was in force for 114 min.
The area
The outline as issued.
The facts
- Issued
- Dec 26, 2018, 8:51 PM CST (02:51 UTC)
- Expired
- Dec 26, 2018, 10:45 PM CST
- In force
- 114 min
- Issued by
- the Storm Prediction Center
All 24 counties
Atascosa County, TX, Bandera County, TX, Bastrop County, TX, Bexar County, TX, Blanco County, TX, Caldwell County, TX, Comal County, TX, Edwards County, TX, Fayette County, TX, Frio County, TX, Gillespie County, TX, Gonzales County, TX, Guadalupe County, TX, Hays County, TX, Kendall County, TX, Kerr County, TX, Kinney County, TX, Lee County, TX, Medina County, TX, Real County, TX, Travis County, TX, Uvalde County, TX, Wilson County, TX, Zavala County, TX
The radar
The Austin/San Antonio radar (KEWX), 82 km from the middle of the area, began a volume at 02:54 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
Del Rio, TX (KDLF), launched 00:00Z, 2.9 hours before the alert went out and 193 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
- 1727 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 1276 m above ground
- 0-6 km bulk shear
- 81 kt
- 0-1 km storm-relative helicity
- 185 m²/s²
- 0-3 km storm-relative helicity
- 193 m²/s²
- Significant tornado parameter
- 1.6
- Supercell composite
- 8.3
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 26, 7:13 PM CST | Mesoscale Discussion | SPC | Bell, Bosque, Collin, Cooke, Dallas, Delta and 22 more | 2 hr |
| Dec 26, 9:34 PM CST | Tornado Watch | SPC | Anderson, Angelina, Brazos, Burleson, Cherokee, Falls and 29 more | 6 hr |
| Dec 26, 11:40 PM CST | Mesoscale Discussion | SPC | Anderson, Angelina, Atascosa, Austin, Bastrop, Bexar and 39 more | 2 hr |
| Dec 27, 12:02 AM CST | Severe Thunderstorm Watch | SPC | Bowie, Cass | 5 hr |
| Dec 27, 3:09 AM CST | Mesoscale Discussion | SPC | Angelina, Austin, Brazoria, Chambers, Fort Bend, Galveston and 14 more | 2 hr |
| Dec 27, 3:43 AM CST | Tornado Watch | SPC | Brazoria, Chambers, Fort Bend, Galveston, Hardin, Harris and 10 more | 10 hr |
| Dec 27, 7:12 AM CST | Mesoscale Discussion | SPC | Jefferson, Orange | 2 hr |
Nearby
Mesoscale Discussions in Texas, 2018Every mesoscale discussion in 2018
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.