Alert archive / Florida / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 105
The Storm Prediction Center issued this severe thunderstorm watch at Apr 5, 2011, 7:04 AM EDT for 21 counties in Florida. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 5, 2011, 7:04 AM EDT (11:04 UTC)
- Expired
- Apr 5, 2011, 1:45 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 21 counties
Brevard County, FL, DeSoto County, FL, Hardee County, FL, Hernando County, FL, Highlands County, FL, Hillsborough County, FL, Indian River County, FL, Lake County, FL, Manatee 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), 110 km from the middle of the area, began a volume at 11:07 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
- 10%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
14 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 5, 7:12 AM EDT | Severe Thunderstorm Warning | TBW | Citrus, Levy, Sumter | 48 min |
| Apr 5, 7:28 AM EDT | Severe Thunderstorm Warning | TBW | Citrus, Hernando, Pasco, Sumter | 47 min |
| Apr 5, 7:45 AM EDT | Severe Thunderstorm Warning | MLB | Lake, Volusia | 60 min |
| Apr 5, 7:47 AM EDT | Severe Thunderstorm Warning | TBW | Hillsborough, Pasco, Pinellas | 43 min |
| Apr 5, 7:54 AM EDT | Severe Thunderstorm Warning | TBW | Citrus, Sumter | 36 min |
| Apr 5, 8:15 AM EDT | Severe Thunderstorm Warning | MLB | Lake, Orange, Osceola, Seminole | 60 min |
| Apr 5, 8:15 AM EDT | Severe Thunderstorm Warning | TBW | Hernando, Pasco, Polk, Sumter | 30 min |
| Apr 5, 8:52 AM EDT | Severe Thunderstorm Warning | MLB | Brevard, Volusia | 38 min |
| Apr 5, 8:57 AM EDT | Severe Thunderstorm Warning | TBW | DeSoto, Hardee, Highlands, Hillsborough, Manatee, Polk and 1 more | 48 min |
| Apr 5, 9:11 AM EDT | Severe Thunderstorm Warning | MLB | Brevard, Lake, Orange, Osceola, Seminole, Volusia | 64 min |
| Apr 5, 10:14 AM EDT | Severe Thunderstorm Warning | MLB | Brevard, Indian River, Osceola | 61 min |
| Apr 5, 10:58 AM EDT | Severe Thunderstorm Warning | MLB | Brevard, Indian River, Okeechobee, Saint Lucie | 62 min |
| Apr 5, 11:59 AM EDT | Severe Thunderstorm Warning | MLB | Martin, Okeechobee, Saint Lucie | 61 min |
| Apr 5, 12:59 PM EDT | Severe Thunderstorm Warning | MLB | Martin | 46 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 00:00Z, 11.1 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
- 9 J/kg
- Mixed-layer CIN
- -299 J/kg
- Mixed-layer LCL
- 1941 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -52 m²/s²
- 0-3 km storm-relative helicity
- -37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 4, 10:05 PM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Gadsden, Holmes, Jackson, Leon and 3 more | 55 min |
| Apr 4, 10:28 PM EDT | Tornado Watch | SPC | Bay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 3 more | 6 hr |
| Apr 5, 12:21 AM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 4 more | 84 min |
| Apr 5, 2:41 AM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Citrus, Clay, Columbia and 19 more | 6 hr |
| Apr 5, 2:55 AM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bay, Bradford, Calhoun, Clay and 22 more | 2 hr |
| Apr 5, 5:39 AM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Citrus, Clay, Columbia and 25 more | 2 hr |
| Apr 5, 8:30 AM EDT | Mesoscale Discussion | SPC | Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 20 more | 2 hr |
| Apr 5, 11:02 AM EDT | Mesoscale Discussion | SPC | Broward, Collier, Glades, Hendry, Highlands, Indian River and 7 more | 118 min |
Nearby
Severe Thunderstorm Watches in Florida, 2011Every severe thunderstorm watch in 2011
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.