Alert archive / Alabama / Tornado Watches in 2020
Tornado Watch 467
The Storm Prediction Center issued this tornado watch at Aug 28, 2020, 3:46 PM CDT for 16 counties in Alabama; Itawamba County, Monroe County, Mississippi; 9 counties in Tennessee. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 28, 2020, 3:46 PM CDT (20:46 UTC)
- Expired
- Aug 28, 2020, 8:00 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 55 kt
All 27 counties
Colbert County, AL, Cullman County, AL, DeKalb County, AL, Fayette County, AL, Franklin County, AL, Jackson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Walker County, AL, Winston County, AL, Itawamba County, MS, Monroe County, MS, Bedford County, TN, Coffee County, TN, Franklin County, TN, Giles County, TN, Lawrence County, TN, Lincoln County, TN, Marshall County, TN, Maury County, TN, Moore County, TN
The radar
The Northeast Alabama radar (KHTX), 104 km from the middle of the area, began a volume at 20:48 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
- 10%
- 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
- 40%
Warnings issued inside it
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 3:46 PM CDT | Severe Thunderstorm Warning | HUN | Colbert, Lauderdale, Lawrence, Limestone | 29 min |
| Aug 28, 4:13 PM CDT | Severe Thunderstorm Warning | MEG | Monroe | 47 min |
| Aug 28, 4:28 PM CDT | Tornado Warning | HUN | Lawrence, Morgan | 32 min |
| Aug 28, 4:32 PM CDT | Severe Thunderstorm Warning | BMX | Fayette, Lamar, Marion | 43 min |
| Aug 28, 4:36 PM CDT | Tornado Warning | BMX | Winston | 39 min |
| Aug 28, 5:13 PM CDT | Severe Thunderstorm Warning | HUN | Cullman, Morgan | 47 min |
| Aug 28, 5:15 PM CDT | Severe Thunderstorm Warning | BMX | Winston | 15 min |
| Aug 28, 5:21 PM CDT | Severe Thunderstorm Warning | BMX | Marion, Walker, Winston | 54 min |
| Aug 28, 5:25 PM CDT | Tornado Warning | HUN | Cullman, Morgan | 35 min |
| Aug 28, 5:27 PM CDT | Severe Thunderstorm Warning | BMX | Fayette, Lamar, Walker | 43 min |
| Aug 28, 5:49 PM CDT | Severe Thunderstorm Warning | HUN | Cullman, Madison, Marshall, Morgan | 41 min |
| Aug 28, 6:20 PM CDT | Severe Thunderstorm Warning | HUN | Jackson, Madison | 25 min |
| Aug 28, 6:28 PM CDT | Severe Thunderstorm Warning | HUN | DeKalb, Jackson, Marshall | 21 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
Nashville Metro, TN (KBNA), launched 12:00Z, 8.8 hours before the alert went out and 162 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
- 598 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 737 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 152 m²/s²
- 0-3 km storm-relative helicity
- 138 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 3.7
The text
As transmitted.
657 WWUS20 KWNS 282044 SEL7 SPC WW 282044 ALZ000-MSZ000-TNZ000-290100- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 467 NWS Storm Prediction Center Norman OK 345 PM CDT Fri Aug 28 2020 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Northwest and north-central Alabama Far northeast Mississippi Southern middle Tennessee * Effective this Friday afternoon and evening from 345 PM until 800 PM CDT. * Primary threats include... A couple tornadoes possible Isolated damaging wind gusts to 65 mph possible SUMMARY...Lingering clusters may still pose a risk for a couple brief tornadoes and locally damaging winds into early evening. The tornado watch area is approximately along and 40 statute miles east and west of a line from 60 miles north of Huntsville AL to 85 miles south southwest of Muscle Shoals AL. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU7). 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...This tornado watch replaces tornado watch number 463...tornado watch number 465. Watch number 463 465 will not be in effect after 345 PM CDT. CONTINUE...WW 464...WW 466... AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 1 inch. Extreme turbulence and surface wind gusts to 55 knots. A few cumulonimbi with maximum tops to 450. Mean storm motion vector 23030. ...Grams
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 10:09 AM CDT | Mesoscale Discussion | SPC | Lauderdale | 96 min |
| Aug 28, 10:31 AM CDT | Tornado Watch | SPC | Colbert, Franklin, Lamar, Lauderdale, Lawrence, Limestone and 2 more | 5 hr |
| Aug 28, 5:19 PM CDT | Mesoscale Discussion | SPC | Blount, Cullman, DeKalb, Fayette, Jackson, Lamar and 7 more | 116 min |
| Aug 27, 8:29 PM CDT | Mesoscale Discussion | SPC | Marshall | 2 hr |
| Aug 28, 6:47 AM CDT | Mesoscale Discussion | SPC | Benton, Lafayette, Marshall, Tippah, Union | 88 min |
| Aug 28, 1:04 PM CDT | Tornado Watch | SPC | Bedford, Cannon, Clay, Coffee, Cumberland, DeKalb and 15 more | 3 hr |
| Aug 28, 1:25 PM CDT | Mesoscale Discussion | SPC | Bedford, Cannon, Coffee, DeKalb, Lincoln, Macon and 6 more | 65 min |
| Aug 28, 6:50 PM CDT | Mesoscale Discussion | SPC | Johnson | 2 hr |
Nearby
Tornado Watches in Alabama, 2020Tornado Watches in Tennessee, 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.