Alert archive / Arkansas / Tornado Watches in 2020
Tornado Watch 458
The Storm Prediction Center issued this tornado watch at Aug 27, 2020, 3:47 PM CDT for 32 counties in Arkansas; 22 counties in Mississippi. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 27, 2020, 3:47 PM CDT (20:47 UTC)
- Expired
- Aug 27, 2020, 11:40 PM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 50 kt
All 54 counties
Arkansas County, AR, Clay County, AR, Cleburne County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Desha County, AR, Faulkner County, AR, Fulton County, AR, Grant County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, White County, AR, Woodruff County, AR, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Lafayette County, MS, Leflore County, MS, Marshall County, MS, Montgomery County, MS, Panola County, MS, Quitman County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Washington County, MS, Yalobusha County, MS, Yazoo County, MS
The radar
The Little Rock radar (KLZK), 114 km from the middle of the area, began a volume at 20:47 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 5%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 20%
Warnings issued inside it
39 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 3:49 PM CDT | Tornado Warning | LZK | Arkansas, Lonoke, Prairie | 17 min |
| Aug 27, 4:03 PM CDT | Flash Flood Warning | LZK | Arkansas, Desha, Grant, Jefferson, Lonoke, Pulaski and 1 more | 4 hr |
| Aug 27, 4:13 PM CDT | Tornado Warning | LZK | Arkansas, Desha, Monroe | 34 min |
| Aug 27, 4:17 PM CDT | Tornado Warning | MEG | Phillips | 25 min |
| Aug 27, 4:19 PM CDT | Flash Flood Warning | LZK | Arkansas, Faulkner, Hot Spring, Lonoke, Prairie, Pulaski and 1 more | 4 hr |
| Aug 27, 5:20 PM CDT | Tornado Warning | MEG | Lee, Phillips | 25 min |
| Aug 27, 5:27 PM CDT | Flash Flood Warning | LZK | Arkansas, Desha, Monroe, Prairie | 3 hr |
| Aug 27, 5:34 PM CDT | Tornado Warning | MEG | Lee, Phillips | 11 min |
| Aug 27, 5:38 PM CDT | Tornado Warning | MEG | Lee, Phillips | 37 min |
| Aug 27, 5:46 PM CDT | Tornado Warning | MEG | Lee, Phillips, St. Francis | 29 min |
| Aug 27, 6:08 PM CDT | Tornado Warning | LZK | White, Woodruff | 52 min |
| Aug 27, 6:17 PM CDT | Tornado Warning | MEG | Lee, Phillips | 8 min |
| Aug 27, 6:19 PM CDT | Flash Flood Warning | LZK | Conway, Faulkner, Lonoke, Monroe, Perry, Prairie and 3 more | 3 hr |
| Aug 27, 6:25 PM CDT | Tornado Warning | MEG | Lee, St. Francis | 19 min |
| Aug 27, 6:44 PM CDT | Tornado Warning | LZK | Jackson, Woodruff | 18 min |
| Aug 27, 6:46 PM CDT | Tornado Warning | MEG | Cross, St. Francis | 17 min |
| Aug 27, 6:54 PM CDT | Tornado Warning | LZK | Independence, Jackson, White, Woodruff | 8 min |
| Aug 27, 7:00 PM CDT | Flash Flood Warning | MEG | Cross, Lee, St. Francis | 3 hr |
| Aug 27, 7:00 PM CDT | Tornado Warning | MEG | Lee, St. Francis | 30 min |
| Aug 27, 7:09 PM CDT | Tornado Warning | MEG | Cross, Poinsett | 36 min |
| Aug 27, 7:14 PM CDT | Tornado Warning | LZK | Independence, Jackson, White, Woodruff | 28 min |
| Aug 27, 7:21 PM CDT | Flash Flood Warning | LZK | Cleburne, Jackson, White, Woodruff | 3 hr |
| Aug 27, 7:22 PM CDT | Tornado Warning | LZK | Independence, Jackson | 20 min |
| Aug 27, 7:52 PM CDT | Tornado Warning | MEG | Cross, Poinsett | 38 min |
| Aug 27, 7:57 PM CDT | Tornado Warning | MEG | Craighead, Poinsett | 35 min |
| Aug 27, 7:58 PM CDT | Tornado Warning | MEG | Lafayette, Panola, Tate | 32 min |
| Aug 27, 8:12 PM CDT | Tornado Warning | MEG | Craighead, Poinsett | 48 min |
| Aug 27, 8:27 PM CDT | Tornado Warning | MEG | DeSoto, Marshall, Panola, Tate | 33 min |
| Aug 27, 8:33 PM CDT | Tornado Warning | LZK | Lawrence, Sharp | 17 min |
| Aug 27, 8:47 PM CDT | Tornado Warning | MEG | Craighead, Mississippi, Poinsett | 43 min |
| Aug 27, 8:52 PM CDT | Tornado Warning | LZK | Lawrence, Randolph, Sharp | 21 min |
| Aug 27, 8:52 PM CDT | Tornado Warning | MEG | Craighead, Greene | 23 min |
| Aug 27, 8:53 PM CDT | Flash Flood Warning | MEG | Crittenden | 3 hr |
| Aug 27, 9:10 PM CDT | Flash Flood Warning | MEG | Craighead, Cross, Poinsett | 3 hr |
| Aug 27, 9:12 PM CDT | Tornado Warning | MEG | Craighead, Greene | 48 min |
| Aug 27, 9:18 PM CDT | Flash Flood Warning | LZK | Cleburne, Independence, Izard, Jackson, Lawrence, Sharp | 3 hr |
| Aug 27, 9:49 PM CDT | Tornado Warning | MEG | Clay, Greene | 23 min |
| Aug 27, 10:29 PM CDT | Tornado Warning | MEG | Clay, Mississippi | 31 min |
| Aug 27, 10:59 PM CDT | Tornado Warning | MEG | Clay | 23 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Little Rock, AR (KLZK), launched 12:00Z, 8.8 hours before the alert went out and 105 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
- 305 J/kg
- Mixed-layer CIN
- -139 J/kg
- Mixed-layer LCL
- 1050 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 50 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted.
437 WWUS20 KWNS 272044 SEL8 SPC WW 272044 ARZ000-MSZ000-280200- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 458 NWS Storm Prediction Center Norman OK 350 PM CDT Thu Aug 27 2020 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Central and eastern Arkansas Western and northern Mississippi * Effective this Thursday afternoon and evening from 350 PM until 900 PM CDT. * Primary threats include... A couple tornadoes possible SUMMARY...Brief tornadoes will remain possible within a broader rainfall region to the east and northeast of tropical cyclone Laura. The tornado watch area is approximately along and 50 statute miles east and west of a line from 150 miles north northwest of Greenville MS to 20 miles south of Greenwood MS. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU8). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Tornado Watch means conditions are favorable for tornadoes and severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. && OTHER WATCH INFORMATION...CONTINUE...WW 454...WW 455...WW 456...WW 457... AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 0.5 inches. Extreme turbulence and surface wind gusts to 50 knots. A few cumulonimbi with maximum tops to 350. Mean storm motion vector 16050. ...Grams
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 6:36 AM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 14 more | 114 min |
| Aug 27, 7:47 AM CDT | Tornado Watch | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 19 more | 8 hr |
| Aug 27, 2:41 PM CDT | Mesoscale Discussion | SPC | Chicot, Crittenden, Cross, Desha, Lee, Phillips and 2 more | 94 min |
| Aug 27, 5:50 PM CDT | Mesoscale Discussion | SPC | Cleburne, Craighead, Crittenden, Cross, Faulkner, Independence and 10 more | 115 min |
| Aug 26, 9:03 PM CDT | Tornado Watch | SPC | Adams, Wilkinson | 11 hr |
| Aug 27, 11:10 AM CDT | Mesoscale Discussion | SPC | Copiah, Jefferson Davis, Lawrence, Marion, Simpson, Walthall | 2 hr |
Nearby
Tornado Watches in Arkansas, 2020Tornado Watches in Mississippi, 2020Every tornado watch 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.