Alert archive / Arkansas / Mesoscale Discussions in 2017
Mesoscale Discussion 143
The Storm Prediction Center issued this mesoscale discussion at Feb 7, 2017, 1:52 AM CST for 5 states. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- Feb 7, 2017, 1:52 AM CST (07:52 UTC)
- Expired
- Feb 7, 2017, 3:45 AM CST
- In force
- 113 min
- Issued by
- the Storm Prediction Center
All 57 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, Fulton County, AR, Garland County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Johnson County, AR, Lawrence County, AR, Mississippi County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Poinsett County, AR, Pope County, AR, Pulaski County, AR, Randolph County, AR, Saline 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, Alexander County, IL, Ballard County, KY, Carlisle County, KY, Fulton County, KY, Hickman County, KY, Bollinger County, MO, Butler County, MO, Carter County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Pemiscot County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO, Crockett County, TN, Dyer County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN
The radar
The Memphis radar (KNQA), 114 km from the middle of the area, began a volume at 07:56 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
Little Rock, AR (KBYH), launched 00:00Z, 7.9 hours before the alert went out and 135 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, 10:31 PM CST | Mesoscale Discussion | SPC | Baxter, Clay, Cleburne, Conway, Craighead, Crittenden and 39 more | 2 hr |
| Feb 6, 10:59 PM CST | Severe Thunderstorm Watch | SPC | Baxter, Boone, Clay, Cleburne, Conway, Craighead and 36 more | 9 hr |
| Feb 7, 7:28 AM CST | Mesoscale Discussion | SPC | Crittenden, Lee, St. Francis | 2 hr |
| Feb 6, 11:20 PM CST | Mesoscale Discussion | SPC | Brown, Cass, Champaign, Christian, Clark, Clay and 36 more | 115 min |
| Feb 7, 4:57 PM CST | Mesoscale Discussion | SPC | Massac | 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.