Alert archive / Oklahoma / Mesoscale Discussions in 2018
Mesoscale Discussion 237
The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2018, 12:39 PM CDT for 5 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 13, 2018, 12:39 PM CDT (17:39 UTC)
- Expired
- Apr 13, 2018, 2:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 95%
All 71 counties
Benton County, AR, Allen County, KS, Bourbon County, KS, Chautauqua County, KS, Cherokee County, KS, Crawford County, KS, Labette County, KS, Montgomery County, KS, Neosho County, KS, Wilson County, KS, Woodson County, KS, Barton County, MO, Jasper County, MO, McDonald County, MO, Newton County, MO, Adair County, OK, Atoka County, OK, Bryan County, OK, Cherokee County, OK, Choctaw County, OK, Coal County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Marshall County, OK, Mayes County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Nowata County, OK, Okfuskee County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pittsburg County, OK, Pontotoc County, OK, Pushmataha County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Bosque County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Fannin County, TX, Freestone County, TX, Grayson 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, Rockwall County, TX, Tarrant County, TX, Van Zandt County, TX
The radar
The Norman radar (KTLX), 136 km from the middle of the area, began a volume at 17:41 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 12:00Z, 5.7 hours before the alert went out and 138 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
- 960 J/kg
- Mixed-layer CIN
- -283 J/kg
- Mixed-layer LCL
- 758 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 577 m²/s²
- 0-3 km storm-relative helicity
- 755 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
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, 12:41 PM CDT | Mesoscale Discussion | SPC | Bradley, Calhoun, Clark, Cleveland, Columbia, Conway and 24 more | 2 hr |
| Apr 13, 1:20 PM CDT | Tornado Watch | SPC | Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more | 9 hr |
| Apr 13, 1:50 PM CDT | Tornado Watch | SPC | Baxter, Boone, Bradley, Calhoun, Clark, Cleburne and 43 more | 8 hr |
| Apr 13, 3:43 PM CDT | Mesoscale Discussion | SPC | Benton, Washington | 92 min |
| Apr 13, 5:53 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 63 more | 97 min |
| Apr 13, 6:50 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Chicot, Desha, Drew | 115 min |
| Apr 13, 2:06 PM CDT | Mesoscale Discussion | SPC | Anderson, Atchison, Brown, Chase, Coffey, Doniphan and 17 more | 2 hr |
| Apr 13, 2:19 PM CDT | Tornado Watch | SPC | Anderson, Atchison, Brown, Coffey, Doniphan, Douglas and 12 more | 7 hr |
| Apr 13, 5:08 PM CDT | Mesoscale Discussion | SPC | Benton, Camden, Carter, Christian, Cole, Dallas and 23 more | 2 hr |
| Apr 13, 5:27 PM CDT | Tornado Watch | SPC | Bollinger, Butler, Camden, Cape Girardeau, Carter, Crawford and 33 more | 8 hr |
| Apr 13, 5:31 PM CDT | Mesoscale Discussion | SPC | Atchison | 29 min |
| Apr 13, 11:04 AM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Choctaw, Coal, Hughes, Johnston and 5 more | 56 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 Oklahoma, 2018Mesoscale Discussions in Texas, 2018Mesoscale Discussions in Kansas, 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.