Alert archive / Georgia / Tornado Watches in 2018
Tornado Watch 406
The Storm Prediction Center issued this tornado watch at Oct 10, 2018, 4:46 AM CDT for 19 counties in Florida; 24 counties in Georgia. It was in force for 11 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 10, 2018, 4:46 AM CDT (09:46 UTC)
- Expired
- Oct 10, 2018, 4:00 PM CDT
- In force
- 11 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 43 counties
Bay County, FL, Calhoun County, FL, Dixie County, FL, Franklin County, FL, Gadsden County, FL, Gilchrist County, FL, Gulf County, FL, Hamilton County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Levy County, FL, Liberty County, FL, Madison County, FL, Suwannee County, FL, Taylor County, FL, Wakulla County, FL, Washington County, FL, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brooks County, GA, Calhoun County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Echols County, GA, Grady County, GA, Irwin County, GA, Lanier County, GA, Lee County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Seminole County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Worth County, GA
The radar
The Tallahassee radar (KTLH), 38 km from the middle of the area, began a volume at 09:50 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
- 60%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 5%
- One or more gusts of 65 knots or more
- 5%
- 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
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 10, 9:47 AM CDT | Tornado Warning | TBW | Levy | 28 min |
| Oct 10, 2:55 PM CDT | Flash Flood Warning | TAE | Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 6 more | 6 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 00:00Z, 9.8 hours before the alert went out and 40 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
- 889 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 754 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 115 m²/s²
- 0-3 km storm-relative helicity
- 177 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
161 WWUS20 KWNS 100944 SEL6 SPC WW 100944 FLZ000-GAZ000-CWZ000-102100- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 406 NWS Storm Prediction Center Norman OK 545 AM EDT Wed Oct 10 2018 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of North Florida and Peninsula Southwest Georgia Coastal Waters * Effective this Wednesday morning and afternoon from 545 AM until 500 PM EDT. * Primary threats include... A few tornadoes likely SUMMARY...Outer bands of hurricane Michael will continue to spread inland through the morning, with an increasing risk of tornadoes in the stronger cells. The tornado watch area is approximately along and 75 statute miles either side of a line from 25 miles west of Panama City FL to 35 miles northeast of Cross City FL. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU6). 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 0.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 15035. ...Hart
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 10, 3:45 AM CDT | Mesoscale Discussion | SPC | Houston | 3 hr |
| Oct 10, 10:30 AM CDT | Mesoscale Discussion | SPC | Houston | 105 min |
| Oct 10, 7:06 AM CDT | Mesoscale Discussion | SPC | Wakulla | 54 min |
| Oct 10, 12:29 PM CDT | Mesoscale Discussion | SPC | Baker, Columbia, Duval, Nassau, Union | 3 hr |
| Oct 10, 1:44 PM CDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 20 more | 11 hr |
| Oct 10, 3:32 PM CDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 15 more | 118 min |
Nearby
Tornado Watches in Georgia, 2018Tornado Watches in Florida, 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.