Alert archive / Florida / Tornado Watches in 2018
Tornado Watch 433
The Storm Prediction Center issued this tornado watch at Dec 1, 2018, 11:16 AM CST for 7 counties in Alabama; 15 counties in Florida; 5 counties in Georgia. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 1, 2018, 11:16 AM CST (17:16 UTC)
- Expired
- Dec 1, 2018, 6:00 PM CST
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 27 counties
Coffee County, AL, Covington County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Bay County, FL, Calhoun County, FL, Escambia County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Leon County, FL, Liberty County, FL, Okaloosa County, FL, Santa Rosa County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Decatur County, GA, Early County, GA, Grady County, GA, Miller County, GA, Seminole County, GA
The radar
The Eglin Afb radar (KEVX), 31 km from the middle of the area, began a volume at 17:18 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
- 40%
- 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
- 10%
- Six or more combined severe hail and wind reports
- 60%
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 |
|---|---|---|---|---|
| Dec 1, 1:15 PM CST | Flash Flood Warning | MOB | Escambia, Santa Rosa | 6 hr |
| Dec 1, 1:24 PM CST | Severe Thunderstorm Warning | TAE | Bay, Walton, Washington | 66 min |
| Dec 1, 1:43 PM CST | Tornado Warning | TAE | Bay, Washington | 47 min |
| Dec 1, 4:01 PM CST | Tornado Warning | TAE | Gadsden | 12 min |
| Dec 1, 5:16 PM CST | Tornado Warning | TAE | Walton, Washington | 10 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
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 5.3 hours before the alert went out and 133 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 976 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 259 m²/s²
- 0-3 km storm-relative helicity
- 531 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
211 WWUS20 KWNS 011714 SEL3 SPC WW 011714 ALZ000-FLZ000-GAZ000-CWZ000-020000- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 433 NWS Storm Prediction Center Norman OK 1115 AM CST Sat Dec 1 2018 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Southeast Alabama Florida Panhandle Southwest Georgia Coastal Waters * Effective this Saturday morning and evening from 1115 AM until 600 PM CST. * Primary threats include... A couple tornadoes possible Scattered damaging wind gusts to 70 mph possible Isolated large hail events to 1 inch in diameter possible SUMMARY...Scattered intense cells offshore will spread into the watch area this afternoon, while other storms form slightly farther north. The strongest cells may be capable of damaging wind gusts and isolated tornadoes. The tornado watch area is approximately along and 70 statute miles north and south of a line from 20 miles south southwest of Crestview FL to 15 miles east northeast of Tallahassee 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. && AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 1 inch. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 25035. ...Hart
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 1, 4:31 AM CST | Mesoscale Discussion | SPC | Baldwin, Choctaw, Clarke, Conecuh, Escambia, Mobile and 2 more | 59 min |
| Dec 1, 1:35 PM CST | Mesoscale Discussion | SPC | Coffee, Covington, Dale, Geneva, Houston | 85 min |
| Dec 1, 3:07 PM CST | Mesoscale Discussion | SPC | Autauga, Bibb, Chilton, Clay, Coosa, Dallas and 10 more | 113 min |
| Dec 1, 3:38 PM CST | Mesoscale Discussion | SPC | Coffee, Covington, Dale, Geneva, Houston | 97 min |
| Dec 1, 5:28 PM CST | Mesoscale Discussion | SPC | Colbert, Cullman, Fayette, Franklin, Lamar, Lauderdale and 7 more | 62 min |
| Dec 1, 5:53 PM CST | Tornado Watch | SPC | Coffee, Covington, Dale, Geneva, Henry, Houston | 9 hr |
| Dec 1, 10:45 AM CST | Mesoscale Discussion | SPC | Bay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 4 more | 2 hr |
Nearby
Tornado Watches in Florida, 2018Tornado Watches in Alabama, 2018Tornado Watches in Georgia, 2018Every tornado watch in 2018
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.