Alert archive / Oklahoma / Mesoscale Discussions in 2017
Mesoscale Discussion 1731
The Storm Prediction Center issued this mesoscale discussion at Oct 21, 2017, 10:42 PM CDT for 12 counties in Arkansas; 16 counties in Oklahoma; 5 counties in Texas. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- Oct 21, 2017, 10:42 PM CDT (03:42 UTC)
- Expired
- Oct 22, 2017, 12:15 AM CDT
- In force
- 93 min
- Issued by
- the Storm Prediction Center
All 33 counties
Benton County, AR, Crawford County, AR, Franklin County, AR, Howard County, AR, Little River County, AR, Logan County, AR, Madison County, AR, Polk County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Washington County, AR, Adair County, OK, Atoka County, OK, Bryan County, OK, Cherokee County, OK, Choctaw County, OK, Coal County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, McIntosh County, OK, Muskogee County, OK, Pittsburg County, OK, Pushmataha County, OK, Sequoyah County, OK, Bowie County, TX, Franklin County, TX, Lamar County, TX, Red River County, TX, Titus County, TX
The radar
The Western Arkansas radar (KSRX), 61 km from the middle of the area, began a volume at 03:43 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, 3.7 hours before the alert went out and 227 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
- 1764 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 974 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 207 m²/s²
- 0-3 km storm-relative helicity
- 226 m²/s²
- Significant tornado parameter
- 1.9
- Supercell composite
- 10.8
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 |
|---|---|---|---|---|
| Oct 21, 8:34 PM CDT | Mesoscale Discussion | SPC | Benton, Washington | 86 min |
| Oct 21, 11:56 PM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Baxter, Benton, Boone, Bradley, Calhoun and 54 more | 7 hr |
| Oct 22, 1:44 AM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Carroll, Clark, Conway, Franklin and 24 more | 91 min |
| Oct 22, 4:57 AM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Clay, Cleveland and 29 more | 93 min |
| Oct 21, 7:24 PM CDT | Tornado Watch | SPC | Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 33 more | 7 hr |
| Oct 21, 7:53 PM CDT | Severe Thunderstorm Watch | SPC | Brown, Callahan, Coleman, Collin, Comanche, Cooke and 28 more | 6 hr |
| Oct 21, 10:09 PM CDT | Mesoscale Discussion | SPC | Callahan, Collin, Cooke, Dallas, Denton, Eastland and 14 more | 96 min |
Nearby
Mesoscale Discussions in Oklahoma, 2017Mesoscale Discussions in Arkansas, 2017Mesoscale Discussions in Texas, 2017Every mesoscale discussion in 2017
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.