Alert archive / Florida / Tornado Watches in 2010
Tornado Watch 29
The Storm Prediction Center issued this tornado watch at Mar 11, 2010, 10:58 AM EST for 25 counties in Florida. It was in force for 9 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 11, 2010, 10:58 AM EST (15:58 UTC)
- Expired
- Mar 11, 2010, 7:54 PM EST
- In force
- 9 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 25 counties
Brevard County, FL, Citrus County, FL, DeSoto County, FL, Flagler County, FL, Hardee County, FL, Hernando County, FL, Highlands County, FL, Hillsborough County, FL, Indian River County, FL, Lake County, FL, Levy County, FL, Manatee County, FL, Marion County, FL, Martin County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Pasco County, FL, Pinellas County, FL, Polk County, FL, Saint Lucie County, FL, Sarasota County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL
The radar
The Tampa radar (KTBW), 84 km from the middle of the area, began a volume at 16:02 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
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
34 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 11, 10:59 AM EST | Tornado Warning | MLB | Lake, Volusia | 46 min |
| Mar 11, 11:16 AM EST | Severe Thunderstorm Warning | TBW | Citrus, Levy | 29 min |
| Mar 11, 11:42 AM EST | Tornado Warning | MLB | Lake, Volusia | 48 min |
| Mar 11, 11:44 AM EST | Severe Thunderstorm Warning | TBW | Citrus, Levy, Sumter | 31 min |
| Mar 11, 12:15 PM EST | Severe Thunderstorm Warning | TBW | Citrus, Sumter | 30 min |
| Mar 11, 12:22 PM EST | Severe Thunderstorm Warning | JAX | Marion | 38 min |
| Mar 11, 12:33 PM EST | Severe Thunderstorm Warning | MLB | Lake, Orange | 57 min |
| Mar 11, 12:42 PM EST | Tornado Warning | TBW | Citrus, Hernando | 33 min |
| Mar 11, 12:44 PM EST | Severe Thunderstorm Warning | TBW | Sumter | 31 min |
| Mar 11, 12:47 PM EST | Tornado Warning | JAX | Flagler | 43 min |
| Mar 11, 1:27 PM EST | Severe Thunderstorm Warning | MLB | Lake, Orange, Seminole, Volusia | 63 min |
| Mar 11, 1:45 PM EST | Tornado Warning | TBW | Citrus, Hernando | 45 min |
| Mar 11, 2:16 PM EST | Severe Thunderstorm Warning | MLB | Martin, Saint Lucie | 44 min |
| Mar 11, 2:25 PM EST | Severe Thunderstorm Warning | TBW | Citrus, Hernando, Pasco, Sumter | 50 min |
| Mar 11, 2:29 PM EST | Tornado Warning | TBW | Citrus, Hernando, Sumter | 31 min |
| Mar 11, 2:31 PM EST | Tornado Warning | TBW | Hernando, Pasco, Sumter | 29 min |
| Mar 11, 2:35 PM EST | Severe Thunderstorm Warning | MLB | Martin | 55 min |
| Mar 11, 2:35 PM EST | Tornado Warning | MLB | Saint Lucie | 25 min |
| Mar 11, 2:38 PM EST | Tornado Warning | MLB | Brevard, Seminole, Volusia | 37 min |
| Mar 11, 2:42 PM EST | Severe Thunderstorm Warning | MLB | Osceola | 63 min |
| Mar 11, 2:48 PM EST | Tornado Warning | MLB | Indian River, Okeechobee, Osceola | 42 min |
| Mar 11, 2:53 PM EST | Severe Thunderstorm Warning | TBW | Citrus, Hernando, Sumter | 37 min |
| Mar 11, 3:01 PM EST | Severe Thunderstorm Warning | MLB | Lake, Orange, Seminole, Volusia | 44 min |
| Mar 11, 3:09 PM EST | Tornado Warning | MLB | Brevard, Indian River, Osceola | 36 min |
| Mar 11, 3:15 PM EST | Severe Thunderstorm Warning | TBW | Hernando, Hillsborough, Pasco, Pinellas, Polk, Sumter | 45 min |
| Mar 11, 3:18 PM EST | Tornado Warning | MLB | Martin | 42 min |
| Mar 11, 3:48 PM EST | Tornado Warning | MLB | Brevard, Indian River | 27 min |
| Mar 11, 4:00 PM EST | Severe Thunderstorm Warning | TBW | Hillsborough, Pasco, Polk | 45 min |
| Mar 11, 4:26 PM EST | Tornado Warning | MLB | Indian River, Okeechobee | 49 min |
| Mar 11, 4:28 PM EST | Tornado Warning | TBW | Polk | 32 min |
| Mar 11, 4:43 PM EST | Tornado Warning | TBW | Polk | 32 min |
| Mar 11, 4:52 PM EST | Severe Thunderstorm Warning | MLB | Osceola | 53 min |
| Mar 11, 4:58 PM EST | Tornado Warning | MLB | Indian River | 20 min |
| Mar 11, 5:35 PM EST | Tornado Warning | MLB | Brevard, Osceola | 27 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
Tampa Bay, FL (KTBW), launched 12:00Z, 4.0 hours before the alert went out and 84 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
- 56 J/kg
- Mixed-layer CIN
- -108 J/kg
- Mixed-layer LCL
- 606 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 393 m²/s²
- 0-3 km storm-relative helicity
- 531 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 11, 4:17 AM EST | Mesoscale Discussion | SPC | Gulf, Wakulla | 118 min |
| Mar 11, 10:26 AM EST | Mesoscale Discussion | SPC | Brevard, Citrus, Hardee, Hernando, Hillsborough, Indian River and 12 more | 64 min |
| Mar 11, 2:13 PM EST | Mesoscale Discussion | SPC | Brevard, Citrus, Hardee, Hernando, Highlands, Hillsborough and 13 more | 62 min |
| Mar 11, 3:45 PM EST | Mesoscale Discussion | SPC | Broward, Glades, Martin, Miami-Dade, Palm Beach | 60 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.