Alert archive / Florida / Tornado Watches in 2017
Tornado Watch 6
The Storm Prediction Center issued this tornado watch at Jan 7, 2017, 12:33 AM EST for 11 counties in Florida. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jan 7, 2017, 12:33 AM EST (05:33 UTC)
- Expired
- Jan 7, 2017, 5:00 AM EST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 55 kt
Counties Citrus County, FL, Dixie County, FL, Hernando County, FL, Hillsborough County, FL, Levy County, FL, Manatee County, FL, Pasco County, FL, Pinellas County, FL, Sarasota County, FL, Sumter County, FL, Taylor County, FL
The radar
The Tallahassee radar (KTLH), 157 km from the middle of the area, began a volume at 05:34 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
- 30%
- 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
- 10%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 30%
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 7, 1:48 AM EST | Tornado Warning | TBW | Citrus | 27 min |
| Jan 7, 2:17 AM EST | Severe Thunderstorm Warning | TBW | Citrus, Sumter | 28 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 00:00Z, 5.6 hours before the alert went out and 155 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
- 26 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 717 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 105 m²/s²
- 0-3 km storm-relative helicity
- 195 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted.
187 WWUS20 KWNS 070531 SEL6 SPC WW 070531 FLZ000-CWZ000-071000- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 6 NWS Storm Prediction Center Norman OK 1235 AM EST Sat Jan 7 2017 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Northwest Florida Coastal Waters * Effective this Saturday morning from 1235 AM until 500 AM EST. * Primary threats include... A couple tornadoes possible Isolated damaging wind gusts to 65 mph possible SUMMARY...A cluster of storms over the northeast Gulf of Mexico should spread inland across parts of northwest Florida early this morning, with the risk of a brief tornado or two and locally damaging winds. The tornado watch area is approximately along and 30 statute miles either side of a line from 50 miles northwest of Cross City FL to 105 miles south southeast of Cross City FL. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU6). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Tornado Watch means conditions are favorable for tornadoes and severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. && AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 1 inch. Extreme turbulence and surface wind gusts to 55 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 24030. ...Grams
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 7, 12:08 AM EST | Mesoscale Discussion | SPC | Alachua, Citrus, Dixie, Gilchrist, Hernando, Hillsborough and 5 more | 2 hr |
| Jan 7, 3:58 AM EST | Mesoscale Discussion | SPC | Citrus, Hernando, Hillsborough, Levy, Manatee, Pasco and 3 more | 92 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.