Alert archive / Arkansas / Tornado Watches in 2021
Tornado Watch 534
The Storm Prediction Center issued this tornado watch at Oct 24, 2021, 10:34 PM CDT for 26 counties in Arkansas; Dunklin County, Pemiscot County, Missouri; 4 counties in Tennessee. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 24, 2021, 10:34 PM CDT (03:34 UTC)
- Expired
- Oct 25, 2021, 2:14 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 32 counties
Clay County, AR, Cleburne County, AR, Conway County, AR, Craighead 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, Lawrence County, AR, Lonoke County, AR, Mississippi County, AR, Perry County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Dunklin County, MO, Pemiscot County, MO, Dyer County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN
The radar
The Little Rock radar (KLZK), 65 km from the middle of the area, began a volume at 03:34 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
- 50%
- One or more EF2 to EF5 tornadoes
- 30%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 24, 11:30 PM CDT | Severe Thunderstorm Warning | LZK | Garland, Saline | 21 min |
| Oct 24, 11:50 PM CDT | Severe Thunderstorm Warning | LZK | Lawrence, Randolph | 40 min |
| Oct 25, 12:05 AM CDT | Severe Thunderstorm Warning | MEG | Clay, Greene | 40 min |
| Oct 25, 1:18 AM CDT | Flash Flood Warning | MEG | Clay | 2 hr |
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 00:00Z, 3.6 hours before the alert went out and 184 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
- 1375 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 1184 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 168 m²/s²
- 0-3 km storm-relative helicity
- 289 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 10.9
The text
As transmitted.
390 WWUS20 KWNS 250331 SEL4 SPC WW 250331 ARZ000-MOZ000-TNZ000-250900- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 534 NWS Storm Prediction Center Norman OK 1035 PM CDT Sun Oct 24 2021 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Central and Northeast Arkansas Missouri Bootheel West Tennessee * Effective this Sunday night and Monday morning from 1035 PM until 400 AM CDT. * Primary threats include... A few tornadoes and a couple intense tornadoes possible Scattered damaging wind gusts to 70 mph likely Scattered large hail events to 1.5 inches in diameter possible SUMMARY...Thunderstorms moving across Arkansas will progress eastward through the watch area. Storms may intensify, with a risk of damaging wind gusts, isolated tornadoes, and hail. The tornado watch area is approximately along and 70 statute miles east and west of a line from 20 miles southwest of Little Rock AR to 45 miles northeast of Walnut Ridge AR. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU4). 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 532...WW 533... AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 27035. ...Hart
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 24, 9:33 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Cleburne, Conway, Faulkner, Franklin and 23 more | 87 min |
| Oct 25, 4:46 PM CDT | Mesoscale Discussion | SPC | Boyd, Carter, Greenup, Lawrence | 119 min |
| Oct 24, 8:17 PM CDT | Mesoscale Discussion | SPC | Bollinger, Cape Girardeau, Carter, Iron, Madison, Perry and 4 more | 118 min |
| Oct 24, 10:33 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Carter, Iron, Madison and 9 more | 2 hr |
Nearby
Tornado Watches in Arkansas, 2021Tornado Watches in Tennessee, 2021Tornado Watches in Missouri, 2021Every tornado watch in 2021
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.