Alert archive / Florida / Tornado Watches in 2010
Tornado Watch 5
The Storm Prediction Center issued this tornado watch at Jan 21, 2010, 8:25 AM EST for 28 counties in Florida; 24 counties in Georgia. It was in force for 10 hr.
The area
The outline as issued.
The facts
- Issued
- Jan 21, 2010, 8:25 AM EST (13:25 UTC)
- Expired
- Jan 21, 2010, 6:00 PM EST
- In force
- 10 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 52 counties
Alachua County, FL, Baker County, FL, Bay County, FL, Bradford County, FL, Calhoun County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Flagler County, FL, Franklin County, FL, Gadsden County, FL, Gilchrist County, FL, Gulf County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Marion County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Wakulla County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Echols County, GA, Glynn County, GA, Grady County, GA, Jeff Davis County, GA, Lanier County, GA, Lowndes County, GA, Pierce County, GA, Seminole County, GA, Thomas County, GA, Ware County, GA, Wayne County, GA
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
- 30%
- Ten or more severe wind reports
- 30%
- 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
- 5%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
35 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 21, 8:31 AM EST | Tornado Warning | TAE | Jefferson, Leon, Wakulla | 44 min |
| Jan 21, 8:34 AM EST | Tornado Warning | TAE | Gadsden | 41 min |
| Jan 21, 8:58 AM EST | Severe Thunderstorm Warning | TAE | Gadsden, Leon, Liberty, Wakulla | 47 min |
| Jan 21, 9:05 AM EST | Severe Thunderstorm Warning | TAE | Bay, Calhoun, Gulf | 40 min |
| Jan 21, 9:07 AM EST | Tornado Warning | TAE | Gadsden, Leon | 23 min |
| Jan 21, 9:25 AM EST | Severe Thunderstorm Warning | TAE | Grady, Thomas | 35 min |
| Jan 21, 9:34 AM EST | Severe Thunderstorm Warning | TAE | Calhoun, Gadsden, Gulf, Liberty | 26 min |
| Jan 21, 9:51 AM EST | Flash Flood Warning | TAE | Gadsden, Leon, Liberty, Wakulla | 114 min |
| Jan 21, 9:53 AM EST | Severe Thunderstorm Warning | TAE | Jefferson, Madison | 21 min |
| Jan 21, 10:00 AM EST | Severe Thunderstorm Warning | TAE | Leon, Liberty, Wakulla | 30 min |
| Jan 21, 10:14 AM EST | Tornado Warning | TAE | Wakulla | 31 min |
| Jan 21, 10:57 AM EST | Severe Thunderstorm Warning | TAE | Jefferson, Taylor | 48 min |
| Jan 21, 11:47 AM EST | Severe Thunderstorm Warning | TAE | Lafayette, Taylor | 43 min |
| Jan 21, 12:04 PM EST | Severe Thunderstorm Warning | JAX | Baker, Columbia | 41 min |
| Jan 21, 12:09 PM EST | Severe Thunderstorm Warning | JAX | Suwannee | 51 min |
| Jan 21, 12:13 PM EST | Severe Thunderstorm Warning | JAX | Nassau | 47 min |
| Jan 21, 12:22 PM EST | Flash Flood Warning | TAE | Franklin, Wakulla | 53 min |
| Jan 21, 12:30 PM EST | Severe Thunderstorm Warning | JAX | Baker, Duval, Nassau | 45 min |
| Jan 21, 12:31 PM EST | Severe Thunderstorm Warning | JAX | Columbia | 44 min |
| Jan 21, 12:35 PM EST | Flash Flood Warning | TAE | Lafayette, Taylor | 55 min |
| Jan 21, 12:39 PM EST | Tornado Warning | JAX | Nassau | 39 min |
| Jan 21, 12:53 PM EST | Severe Thunderstorm Warning | JAX | Baker, Bradford, Union | 52 min |
| Jan 21, 1:01 PM EST | Tornado Warning | JAX | Baker, Bradford, Union | 44 min |
| Jan 21, 1:06 PM EST | Severe Thunderstorm Warning | JAX | Duval, Nassau | 39 min |
| Jan 21, 1:19 PM EST | Tornado Warning | JAX | Bradford, Union | 26 min |
| Jan 21, 1:27 PM EST | Tornado Warning | JAX | Bradford, Union | 19 min |
| Jan 21, 1:28 PM EST | Tornado Warning | JAX | Bradford, Clay | 32 min |
| Jan 21, 1:29 PM EST | Flash Flood Warning | TAE | Lafayette, Taylor | 61 min |
| Jan 21, 1:40 PM EST | Severe Thunderstorm Warning | JAX | Clay, Putnam | 50 min |
| Jan 21, 1:44 PM EST | Tornado Warning | JAX | Clay, Duval, Saint Johns | 61 min |
| Jan 21, 2:01 PM EST | Tornado Warning | JAX | Clay, Saint Johns | 46 min |
| Jan 21, 2:30 PM EST | Tornado Warning | JAX | Saint Johns | 14 min |
| Jan 21, 2:41 PM EST | Severe Thunderstorm Warning | JAX | Flagler, Putnam, Saint Johns | 28 min |
| Jan 21, 3:36 PM EST | Severe Thunderstorm Warning | JAX | Alachua, Bradford, Clay, Putnam, Union | 39 min |
| Jan 21, 4:04 PM EST | Severe Thunderstorm Warning | JAX | Clay, Flagler, Putnam, Saint Johns | 41 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, 1.4 hours before the alert went out and 110 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
- 85 J/kg
- Mixed-layer CIN
- -138 J/kg
- Mixed-layer LCL
- 490 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 654 m²/s²
- 0-3 km storm-relative helicity
- 749 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 20, 11:18 PM EST | Mesoscale Discussion | SPC | Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 9 more | 87 min |
| Jan 21, 2:31 AM EST | Mesoscale Discussion | SPC | Bay, Calhoun, Escambia, Gulf, Holmes, Jackson and 4 more | 29 min |
| Jan 21, 3:09 AM EST | Tornado Watch | SPC | Bay, Calhoun, Escambia, Franklin, Gulf, Holmes and 6 more | 7 hr |
| Jan 21, 6:44 AM EST | Mesoscale Discussion | SPC | Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 9 more | 61 min |
| Jan 21, 8:12 AM EST | Mesoscale Discussion | SPC | Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 8 more | 33 min |
| Jan 21, 8:57 AM EST | Mesoscale Discussion | SPC | Holmes, Jackson, Walton, Washington | 33 min |
| Jan 21, 11:35 AM EST | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Duval and 11 more | 55 min |
| Jan 21, 2:09 PM EST | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 10 more | 66 min |
| Jan 21, 6:14 PM EST | Mesoscale Discussion | SPC | Catoosa, Dade, Walker | 91 min |
Nearby
Tornado Watches in Florida, 2010Tornado Watches in Georgia, 2010Every tornado watch in 2010
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.