Alert archive / Arkansas / Mesoscale Discussions in 2017
Mesoscale Discussion 1228
The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2017, 12:51 AM CDT for 25 counties in Arkansas; 11 counties in Oklahoma; Bowie County, Lamar County, Red River County, Texas. It was in force for 114 min.
The area
The outline as issued.
The facts
- Issued
- Jul 4, 2017, 12:51 AM CDT (05:51 UTC)
- Expired
- Jul 4, 2017, 2:45 AM CDT
- In force
- 114 min
- Issued by
- the Storm Prediction Center
All 39 counties
Clark County, AR, Conway County, AR, Crawford County, AR, Dallas County, AR, Franklin County, AR, Garland County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Johnson County, AR, Little River County, AR, Logan County, AR, Montgomery County, AR, Nevada County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Saline County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Van Buren County, AR, Washington County, AR, Yell County, AR, Adair County, OK, Atoka County, OK, Bryan County, OK, Cherokee County, OK, Choctaw County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK, Sequoyah County, OK, Bowie County, TX, Lamar County, TX, Red River County, TX
The radar
The Western Arkansas radar (KSRX), 66 km from the middle of the area, began a volume at 05:52 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 nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 5.9 hours before the alert went out and 267 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
- 2711 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 1254 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 103 m²/s²
- 0-3 km storm-relative helicity
- 147 m²/s²
- Significant tornado parameter
- 1.7
- Supercell composite
- 17.0
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 |
|---|---|---|---|---|
| Jul 4, 5:58 PM CDT | Mesoscale Discussion | SPC | Arkansas, Crittenden, Cross, Desha, Jefferson, Lee and 5 more | 2 hr |
| Jul 3, 7:26 PM CDT | Mesoscale Discussion | SPC | Beckham, Caddo, Canadian, Cleveland, Comanche, Custer and 16 more | 64 min |
| Jul 3, 8:23 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Cleveland, Coal, Creek and 20 more | 67 min |
| Jul 3, 8:39 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Carter, Cherokee, Choctaw, Coal and 26 more | 6 hr |
| Jul 3, 10:30 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Cherokee, Coal, Haskell and 16 more | 60 min |
| Jul 3, 10:50 PM CDT | Severe Thunderstorm Watch | SPC | Collin, Cooke, Dallas, Delta, Denton, Fannin and 12 more | 5 hr |
| Jul 4, 4:44 PM CDT | Mesoscale Discussion | SPC | Bailey, Castro, Deaf Smith, Oldham, Parmer | 2 hr |
| Jul 4, 6:51 PM CDT | Severe Thunderstorm Watch | SPC | Bailey, Briscoe, Castro, Cochran, Crosby, Dickens and 14 more | 6 hr |
Nearby
Mesoscale Discussions in Arkansas, 2017Mesoscale Discussions in Oklahoma, 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.