Alert archive / Arkansas / Tornado Watches in 2021
Tornado Watch 123
The Storm Prediction Center issued this tornado watch at Apr 29, 2021, 2:01 AM CDT for 23 counties in Arkansas; 21 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 29, 2021, 2:01 AM CDT (07:01 UTC)
- Expired
- Apr 29, 2021, 8:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 44 counties
Clark County, AR, Conway County, AR, Faulkner County, AR, Garland County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Little River County, AR, Logan County, AR, Lonoke County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Sevier County, AR, White County, AR, Yell County, AR, Bowie County, TX, Camp County, TX, Cass County, TX, Delta County, TX, Franklin County, TX, Gregg County, TX, Henderson County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX
The radar
The Shreveport radar (KSHV), 135 km from the middle of the area, began a volume at 07:02 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
- 30%
- One or more EF2 to EF5 tornadoes
- 10%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 50%
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 29, 4:35 AM CDT | Flash Flood Warning | LZK | Cleburne, Independence, Stone, Van Buren, White | 4 hr |
| Apr 29, 6:01 AM CDT | Flash Flood Warning | LZK | Garland, Montgomery, Perry, Pike, Saline | 4 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
Shreveport, LA (KSHV), launched 00:00Z, 7.0 hours before the alert went out and 138 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
- 976 J/kg
- Mixed-layer CIN
- -47 J/kg
- Mixed-layer LCL
- 1188 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 169 m²/s²
- 0-3 km storm-relative helicity
- 258 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 5.0
The text
As transmitted.
043 WWUS20 KWNS 290659 SEL3 SPC WW 290659 ARZ000-OKZ000-TXZ000-291300- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 123 NWS Storm Prediction Center Norman OK 200 AM CDT Thu Apr 29 2021 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Central and southwestern Arkansas Extreme southeastern Oklahoma Northeast Texas * Effective this Thursday morning from 200 AM until 800 AM CDT. * Primary threats include... A couple tornadoes possible Isolated damaging wind gusts to 70 mph possible Isolated large hail events to 1.5 inches in diameter possible SUMMARY...A swath of convection, with occasional strong-severe thunderstorms, will pose a threat for intermittent severe wind and hail. Embedded supercells and mesovortices may offer a tornado threat as well, in a favorably sheared and moist environment. The tornado watch area is approximately along and 60 statute miles east and west of a line from 40 miles west southwest of Tyler TX to 45 miles north of Little Rock AR. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU3). 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 121...WW 122... 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 25030. ...Edwards
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 28, 7:55 PM CDT | Tornado Watch | SPC | Clark, Cleburne, Conway, Crawford, Faulkner, Franklin and 18 more | 6 hr |
| Apr 28, 9:19 PM CDT | Mesoscale Discussion | SPC | Crawford, Franklin, Howard, Little River, Logan, Montgomery and 5 more | 116 min |
| Apr 28, 10:22 PM CDT | Mesoscale Discussion | SPC | Cleburne, Conway, Craighead, Crittenden, Cross, Faulkner and 22 more | 113 min |
| Apr 29, 1:09 AM CDT | Mesoscale Discussion | SPC | Hempstead, Howard, Little River, Logan, Miller, Montgomery and 6 more | 2 hr |
| Apr 29, 3:14 AM CDT | Mesoscale Discussion | SPC | Clay, Craighead, Greene | 3 hr |
| Apr 28, 7:01 PM CDT | Mesoscale Discussion | SPC | Bastrop, Bexar, Caldwell, Comal, Gonzales, Guadalupe and 4 more | 89 min |
| Apr 28, 7:31 PM CDT | Mesoscale Discussion | SPC | Callahan, Coleman, Collin, Comanche, Cooke, Dallas and 24 more | 119 min |
| Apr 28, 9:13 PM CDT | Mesoscale Discussion | SPC | Bastrop, Bexar, Caldwell, Colorado, Comal, Fayette and 4 more | 92 min |
| Apr 28, 10:22 PM CDT | Tornado Watch | SPC | Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 27 more | 7 hr |
| Apr 28, 11:03 PM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 37 more | 117 min |
Nearby
Tornado Watches in Arkansas, 2021Tornado Watches in Texas, 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.