Alert archive / Florida / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 384
The Storm Prediction Center issued this severe thunderstorm watch at Jun 12, 2007, 8:25 AM EDT for 15 counties in Florida; 5 counties in Georgia. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 12, 2007, 8:25 AM EDT (12:25 UTC)
- Expired
- Jun 12, 2007, 3:31 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Hamilton County, FL, Marion County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Suwannee County, FL, Union County, FL, Camden County, GA, Charlton County, GA, Clinch County, GA, Echols County, GA, Ware County, GA
The radar
The Jacksonville radar (KJAX), 69 km from the middle of the area, began a volume at 12:28 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 9:17 AM EDT | Severe Thunderstorm Warning | JAX | Clinch, Echols, Ware | 43 min |
| Jun 12, 9:45 AM EDT | Severe Thunderstorm Warning | JAX | Baker, Columbia | 45 min |
| Jun 12, 10:36 AM EDT | Severe Thunderstorm Warning | JAX | Clay, Saint Johns | 54 min |
| Jun 12, 10:41 AM EDT | Severe Thunderstorm Warning | JAX | Duval | 23 min |
| Jun 12, 10:43 AM EDT | Severe Thunderstorm Warning | JAX | Bradford | 47 min |
| Jun 12, 11:09 AM EDT | Tornado Warning | JAX | Saint Johns | 40 min |
| Jun 12, 11:27 AM EDT | Severe Thunderstorm Warning | JAX | Flagler | 63 min |
| Jun 12, 12:23 PM EDT | Severe Thunderstorm Warning | JAX | Marion | 67 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
Jacksonville, FL (KJAX), launched 12:00Z, 0.4 hours before the alert went out and 70 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
- 1068 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 674 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 6:03 AM EDT | Mesoscale Discussion | SPC | Gadsden, Jefferson, Leon | 57 min |
| Jun 12, 11:09 AM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Brevard, Charlotte, Citrus and 34 more | 36 min |
| Jun 12, 11:30 AM EDT | Severe Thunderstorm Watch | SPC | Brevard, Citrus, DeSoto, Hardee, Hernando, Highlands and 17 more | 6 hr |
| Jun 12, 1:36 PM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Columbia, Dixie, Franklin, Gadsden and 17 more | 54 min |
| Jun 12, 3:16 PM EDT | Mesoscale Discussion | SPC | Brevard, Citrus, DeSoto, Glades, Hardee, Hernando and 18 more | 59 min |
| Jun 12, 4:02 PM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 8 more | 28 min |
| Jun 12, 4:23 PM EDT | Severe Thunderstorm Watch | SPC | Bay, Calhoun, Dixie, Escambia, Franklin, Gadsden and 14 more | 5 hr |
| Jun 12, 4:59 PM EDT | Mesoscale Discussion | SPC | Broward, Indian River, Martin, Okeechobee, Palm Beach, Saint Lucie | 61 min |
| Jun 12, 12:02 PM EDT | Mesoscale Discussion | SPC | Banks, Barrow, Bartow, Carroll, Catoosa, Chattooga and 38 more | 58 min |
| Jun 12, 2:23 PM EDT | Severe Thunderstorm Watch | SPC | Baldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 80 more | 8 hr |
| Jun 12, 4:48 PM EDT | Mesoscale Discussion | SPC | Baldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 86 more | 57 min |
Nearby
Severe Thunderstorm Watches in Florida, 2007Severe Thunderstorm Watches in Georgia, 2007Every severe thunderstorm watch in 2007
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.