Alert archive / Alabama / Tornado Watches in 2021
Tornado Watch 543
The Storm Prediction Center issued this tornado watch at Oct 27, 2021, 7:21 PM CDT for 4 counties in Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 27, 2021, 7:21 PM CDT (00:21 UTC)
- Expired
- Oct 28, 2021, 2:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 55 kt
Counties Baldwin County, AL, Escambia County, AL, Mobile County, AL, Washington County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL
The radar
The Mobile radar (KMOB), 66 km from the middle of the area, began a volume at 00:20 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
- 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
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 27, 8:53 PM CDT | Tornado Warning | MOB | Mobile | 35 min |
| Oct 27, 9:08 PM CDT | Tornado Warning | MOB | Mobile | 25 min |
| Oct 27, 11:49 PM CDT | Severe Thunderstorm Warning | MOB | Okaloosa | 41 min |
| Oct 28, 12:31 AM CDT | Flash Flood Warning | MOB | Okaloosa | 5 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
Slidell Radar S, LA (KSIL), launched 00:00Z, 0.4 hours before the alert went out and 214 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
- 1392 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 520 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 216 m²/s²
- 0-3 km storm-relative helicity
- 253 m²/s²
- Significant tornado parameter
- 1.5
- Supercell composite
- 8.0
The text
As transmitted.
052 WWUS20 KWNS 280018 SEL3 SPC WW 280018 ALZ000-FLZ000-CWZ000-280600- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 543 NWS Storm Prediction Center Norman OK 720 PM CDT Wed Oct 27 2021 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Southwest Alabama Western Florida Panhandle Coastal Waters * Effective this Wednesday night and Thursday morning from 720 PM until 100 AM CDT. * Primary threats include... A couple tornadoes possible Isolated damaging wind gusts to 65 mph possible SUMMARY...A steadily progressing squall line should continue to shift across the central Gulf Coast region into the early overnight. A couple tornadoes and locally damaging winds will remain possible. The tornado watch area is approximately along and 35 statute miles north and south of a line from 15 miles north northwest of Mobile AL to 15 miles south southeast of Crestview FL. 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 542... AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 0.5 inches. Extreme turbulence and surface wind gusts to 55 knots. A few cumulonimbi with maximum tops to 550. Mean storm motion vector 23035. ...Grams
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 27, 9:08 PM CDT | Mesoscale Discussion | SPC | Baldwin, Escambia, Mobile | 97 min |
| Oct 27, 10:22 PM CDT | Mesoscale Discussion | SPC | Bay, Franklin, Gulf, Walton | 2 hr |
| Oct 27, 11:21 PM CDT | Tornado Watch | SPC | Bay, Calhoun, Franklin, Gulf, Liberty, Wakulla and 2 more | 6 hr |
| Oct 28, 7:12 AM CDT | Mesoscale Discussion | SPC | Alachua, Bradford, Citrus, Dixie, Gilchrist, Hernando and 7 more | 2 hr |
| Oct 28, 8:00 AM CDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Brevard, Charlotte, Citrus and 35 more | 10 hr |
| Oct 28, 10:51 AM CDT | Mesoscale Discussion | SPC | Charlotte, DeSoto, Flagler, Hardee, Highlands, Hillsborough and 11 more | 114 min |
| Oct 28, 1:08 PM CDT | Mesoscale Discussion | SPC | Charlotte, DeSoto, Flagler, Hardee, Lake, Manatee and 3 more | 97 min |
| Oct 28, 3:11 PM CDT | Mesoscale Discussion | SPC | Brevard, Charlotte, DeSoto, Glades, Highlands, Indian River and 2 more | 94 min |
Nearby
Tornado Watches in Alabama, 2021Tornado Watches in Florida, 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.