Alert archive / Florida / Tornado Watches in 2021
Tornado Watch 441
The Storm Prediction Center issued this tornado watch at Aug 16, 2021, 7:33 AM CDT for Houston County, Alabama; 14 counties in Florida; 10 counties in Georgia. It was in force for 13 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 16, 2021, 7:33 AM CDT (12:33 UTC)
- Expired
- Aug 16, 2021, 8:43 PM CDT
- In force
- 13 hr
- Issued by
- the Storm Prediction Center
- Strongest gust expected
- 60 kt
All 25 counties
Houston County, AL, Bay County, FL, Calhoun County, FL, Dixie County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Taylor County, FL, Wakulla County, FL, Baker County, GA, Brooks County, GA, Colquitt County, GA, Decatur County, GA, Early County, GA, Grady County, GA, Miller County, GA, Mitchell County, GA, Seminole County, GA, Thomas County, GA
The radar
The Tallahassee radar (KTLH), 45 km from the middle of the area, began a volume at 12:38 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
- 20%
- Ten or more severe wind reports
- 10%
- 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
- 20%
Warnings issued inside it
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 2:19 PM CDT | Flash Flood Warning | TAE | Bay, Calhoun, Gulf, Washington | 6 hr |
| Aug 16, 3:51 PM CDT | Flash Flood Warning | TAE | Calhoun, Gulf, Jackson, Liberty, Washington | 6 hr |
| Aug 16, 5:19 PM CDT | Flash Flood Warning | TAE | Geneva, Houston | 6 hr |
| Aug 16, 6:52 PM CDT | Flash Flood Warning | TAE | Dale, Geneva, Henry, Houston | 4 hr |
| Aug 16, 8:32 PM CDT | Flash Flood Warning | TAE | Houston | 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
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 0.6 hours before the alert went out and 47 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
- 368 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 754 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
823 WWUS20 KWNS 161227 SEL1 SPC WW 161227 ALZ000-FLZ000-GAZ000-CWZ000-170000- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 441 NWS Storm Prediction Center Norman OK 825 AM EDT Mon Aug 16 2021 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Extreme southeastern Alabama Central and eastern Panhandle of Florida Southwestern Georgia Coastal Waters * Effective this Monday morning and evening from 825 AM until 800 PM EDT. * Primary threats include... A few tornadoes possible SUMMARY...As Tropical Storm Fred approaches landfall on the FL Panhandle coastline, the threat for a few tornadoes will increase with supercells moving inland in northeastern and eastern sectors of the circulation. The tornado watch area is approximately along and 70 statute miles north and south of a line from 30 miles southwest of Marianna FL to 60 miles east of Tallahassee FL. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU1). 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. && AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 0 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 13035. ...Edwards
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 6:26 PM CDT | Mesoscale Discussion | SPC | Henry, Houston | 64 min |
| Aug 16, 5:26 AM CDT | Mesoscale Discussion | SPC | Franklin | 3 hr |
| Aug 16, 9:20 AM CDT | Mesoscale Discussion | SPC | Franklin, Wakulla | 115 min |
| Aug 16, 11:36 AM CDT | Mesoscale Discussion | SPC | Franklin, Taylor, Wakulla | 114 min |
| Aug 16, 2:55 PM CDT | Mesoscale Discussion | SPC | Dixie, Gilchrist, Jefferson, Lafayette, Levy, Taylor | 2 hr |
Nearby
Tornado Watches in Florida, 2021Tornado Watches in Georgia, 2021Tornado Watches in Alabama, 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.