Alert archive / Florida / Tornado Watches in 2008
Tornado Watch 843
The Storm Prediction Center issued this tornado watch at Aug 19, 2008, 3:46 PM EDT for 9 counties in Florida. It was in force for 9 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 19, 2008, 3:46 PM EDT (19:46 UTC)
- Expired
- Aug 20, 2008, 1:00 AM EDT
- In force
- 9 hr
- Issued by
- the Storm Prediction Center
- Strongest gust expected
- 60 kt
Counties Brevard County, FL, Flagler County, FL, Indian River County, FL, Orange County, FL, Osceola County, FL, Putnam County, FL, Saint Johns County, FL, Seminole County, FL, Volusia County, FL
The radar
The Melbourne radar (KMLB), 72 km from the middle of the area, began a volume at 20:02 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
- 20%
- 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
- 50%
Warnings issued inside it
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 4:29 PM EDT | Tornado Warning | MLB | Brevard | 31 min |
| Aug 19, 6:13 PM EDT | Flash Flood Warning | MLB | Brevard | 3 hr |
| Aug 19, 8:57 PM EDT | Flash Flood Warning | MLB | Brevard | 2 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
Cape Canaveral, FL (KXMR), launched 12:00Z, 7.8 hours before the alert went out and 54 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
- 272 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 943 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -17 m²/s²
- 0-3 km storm-relative helicity
- 50 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 10:44 PM EDT | Tornado Watch | SPC | Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 13 more | 9 hr |
| Aug 19, 3:37 AM EDT | Mesoscale Discussion | SPC | Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 13 more | 53 min |
| Aug 19, 6:29 AM EDT | Mesoscale Discussion | SPC | Brevard, Broward, Glades, Hardee, Hendry, Highlands and 11 more | 31 min |
| Aug 19, 7:05 AM EDT | Tornado Watch | SPC | Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 16 more | 9 hr |
| Aug 19, 11:32 AM EDT | Mesoscale Discussion | SPC | Brevard, Broward, Charlotte, Collier, DeSoto, Flagler and 20 more | 88 min |
| Aug 19, 3:04 PM EDT | Mesoscale Discussion | SPC | Brevard, Flagler, Indian River, Lake, Orange, Osceola and 3 more | 86 min |
| Aug 19, 7:10 PM EDT | Mesoscale Discussion | SPC | Brevard | 95 min |
Nearby
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.