Alert archive / Texas / Mesoscale Discussions in 2018
Mesoscale Discussion 236
The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2018, 11:04 AM CDT for 11 counties in Oklahoma; 18 counties in Texas. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Apr 13, 2018, 11:04 AM CDT (16:04 UTC)
- Expired
- Apr 13, 2018, 12:00 PM CDT
- In force
- 56 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 29 counties
Atoka County, OK, Bryan County, OK, Choctaw County, OK, Coal County, OK, Hughes County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Pittsburg County, OK, Pontotoc County, OK, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Fannin County, TX, Grayson County, TX, Henderson County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Navarro County, TX, Rains County, TX, Rockwall County, TX, Tarrant County, TX, Van Zandt County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 165 km from the middle of the area, began a volume at 16:07 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
Fort Worth, TX (KFWD), launched 12:00Z, 4.1 hours before the alert went out and 141 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
- 731 J/kg
- Mixed-layer CIN
- -418 J/kg
- Mixed-layer LCL
- 788 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 189 m²/s²
- 0-3 km storm-relative helicity
- 250 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 |
|---|---|---|---|---|
| Apr 13, 12:39 PM CDT | Mesoscale Discussion | SPC | Adair, Atoka, Bryan, Cherokee, Choctaw, Coal and 27 more | 2 hr |
| Apr 13, 12:41 PM CDT | Mesoscale Discussion | SPC | McCurtain | 2 hr |
| Apr 13, 1:20 PM CDT | Tornado Watch | SPC | Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 34 more | 9 hr |
| Apr 13, 1:50 PM CDT | Tornado Watch | SPC | McCurtain | 8 hr |
| Apr 13, 3:43 PM CDT | Mesoscale Discussion | SPC | Adair, Atoka, Bryan, Cherokee, Choctaw, Coal and 24 more | 92 min |
| Apr 13, 5:53 PM CDT | Mesoscale Discussion | SPC | McCurtain | 97 min |
| Apr 13, 4:49 PM CDT | Mesoscale Discussion | SPC | Bastrop, Bell, Blanco, Brazos, Burleson, Burnet and 14 more | 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.