Alert archive / Texas / Mesoscale Discussions in 2018
Mesoscale Discussion 1729
The Storm Prediction Center issued this mesoscale discussion at Dec 26, 2018, 7:13 PM CST for 24 counties in Oklahoma; 28 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 26, 2018, 7:13 PM CST (01:13 UTC)
- Expired
- Dec 26, 2018, 9:15 PM CST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 52 counties
Atoka County, OK, Bryan County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Choctaw County, OK, Cleveland County, OK, Coal County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Johnston County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Okfuskee County, OK, Oklahoma County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Bell County, TX, Bosque County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Falls County, TX, Fannin County, TX, Freestone County, TX, Grayson County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Limestone County, TX, McLennan County, TX, Navarro County, TX, Rains County, TX, Robertson County, TX, Rockwall County, TX, Tarrant County, TX, Van Zandt County, TX, Wise County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 110 km from the middle of the area, began a volume at 01:13 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
Norman, OK (KOUN), launched 00:00Z, 1.2 hours before the alert went out and 184 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 840 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 497 m²/s²
- 0-3 km storm-relative helicity
- 683 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 27, 2:16 AM CST | Mesoscale Discussion | SPC | Texas | 6 hr |
| Dec 26, 8:51 PM CST | Mesoscale Discussion | SPC | Atascosa, Bandera, Bastrop, Bexar, Blanco, Caldwell and 18 more | 114 min |
| 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, 2018Mesoscale Discussions in Oklahoma, 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.