Alert archive / Arkansas / Mesoscale Discussions in 2020
Mesoscale Discussion 1634
The Storm Prediction Center issued this mesoscale discussion at Aug 29, 2020, 3:32 PM CDT for 48 counties in Arkansas; 15 counties in Mississippi; 4 counties in Tennessee. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- Aug 29, 2020, 3:32 PM CDT (20:32 UTC)
- Expired
- Aug 29, 2020, 5:00 PM CDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch possible
- Chance of a watch
- 40%
All 67 counties
Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jackson County, AR, Jefferson County, AR, Lafayette County, AR, Lee County, AR, Lincoln County, AR, Little River County, AR, Logan County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Poinsett County, AR, Polk County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, St. Francis County, AR, Union County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Benton County, MS, Bolivar County, MS, Coahoma County, MS, DeSoto County, MS, Lafayette County, MS, Leflore County, MS, Marshall County, MS, Panola County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Washington County, MS, Yalobusha County, MS, Fayette County, TN, Lauderdale County, TN, Shelby County, TN, Tipton County, TN
The radar
The Little Rock radar (KLZK), 40 km from the middle of the area, began a volume at 20:35 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
Springfield, MO (KSGF), launched 12:00Z, 8.5 hours before the alert went out and 307 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
- 1326 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 1347 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 65 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 |
|---|---|---|---|---|
| Aug 29, 11:56 AM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Carroll, Clay, Cleburne, Conway and 34 more | 94 min |
| Aug 29, 5:07 PM CDT | Mesoscale Discussion | SPC | Crawford, Franklin, Johnson, Logan, Montgomery, Polk and 3 more | 2 hr |
| Aug 29, 6:42 PM CDT | Severe Thunderstorm Watch | SPC | Clark, Columbia, Crawford, Franklin, Garland, Hempstead and 14 more | 6 hr |
| Aug 29, 3:22 PM CDT | Mesoscale Discussion | SPC | Bedford, Benton, Cannon, Carroll, Cheatham, Clay and 37 more | 113 min |
Nearby
Mesoscale Discussions in Arkansas, 2020Mesoscale Discussions in Mississippi, 2020Mesoscale Discussions in Tennessee, 2020Every mesoscale discussion in 2020
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.