Alert archive / Arkansas / Mesoscale Discussions in 2017
Mesoscale Discussion 141
The Storm Prediction Center issued this mesoscale discussion at Feb 6, 2017, 10:31 PM CST for 45 counties in Arkansas; 4 counties in Missouri; Dyer County, Lauderdale County, Tipton County, Tennessee. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 6, 2017, 10:31 PM CST (04:31 UTC)
- Expired
- Feb 7, 2017, 1:00 AM CST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 52 counties
Baxter County, AR, Clay County, AR, Cleburne County, AR, Conway County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Faulkner County, AR, Franklin County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hot Spring County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Johnson County, AR, Lawrence County, AR, Lee County, AR, Logan County, AR, Lonoke County, AR, Marion County, AR, Mississippi County, AR, Monroe County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Pike County, AR, Poinsett County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Butler County, MO, Dunklin County, MO, Pemiscot County, MO, Ripley County, MO, Dyer County, TN, Lauderdale County, TN, Tipton County, TN
The radar
The Little Rock radar (KLZK), 52 km from the middle of the area, began a volume at 04:32 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
Little Rock, AR (KBYH), launched 00:00Z, 4.5 hours before the alert went out and 210 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
- 381 J/kg
- Mixed-layer CIN
- -86 J/kg
- Mixed-layer LCL
- 750 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 336 m²/s²
- 0-3 km storm-relative helicity
- 453 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 6.3
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 |
|---|---|---|---|---|
| Feb 6, 10:59 PM CST | Severe Thunderstorm Watch | SPC | Baxter, Boone, Clay, Cleburne, Conway, Craighead and 36 more | 9 hr |
| Feb 7, 1:52 AM CST | Mesoscale Discussion | SPC | Baxter, Clay, Cleburne, Conway, Craighead, Crittenden and 27 more | 113 min |
| Feb 7, 7:28 AM CST | Mesoscale Discussion | SPC | Crittenden, Lee, St. Francis | 2 hr |
| Feb 7, 4:57 PM CST | Mesoscale Discussion | SPC | Mississippi | 2 hr |
Nearby
Mesoscale Discussions in Arkansas, 2017Mesoscale Discussions in Missouri, 2017Mesoscale Discussions in Tennessee, 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.