Alert archive / Florida / Tornado Watches in 2017
Tornado Watch 131
The Storm Prediction Center issued this tornado watch at Apr 6, 2017, 12:15 AM EDT for 28 counties in Florida; 7 counties in Georgia. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 6, 2017, 12:15 AM EDT (04:15 UTC)
- Expired
- Apr 6, 2017, 6:31 AM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 35 counties
Alachua County, FL, Baker County, FL, Bradford County, FL, Citrus County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Hamilton County, FL, Hernando County, FL, Lafayette County, FL, Lake County, FL, Levy County, FL, Madison County, FL, Marion County, FL, Nassau County, FL, Orange County, FL, Pasco County, FL, Putnam County, FL, Saint Johns County, FL, Seminole County, FL, Sumter County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Volusia County, FL, Brantley County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Echols County, GA, Glynn County, GA, Ware County, GA
The radar
The Jacksonville radar (KJAX), 101 km from the middle of the area, began a volume at 04:15 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
- 50%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 20%
- 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
- 60%
Warnings issued inside it
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 6, 12:49 AM EDT | Severe Thunderstorm Warning | JAX | Baker, Columbia, Hamilton | 41 min |
| Apr 6, 1:29 AM EDT | Severe Thunderstorm Warning | JAX | Nassau | 46 min |
| Apr 6, 2:10 AM EDT | Tornado Warning | JAX | Nassau | 15 min |
| Apr 6, 3:54 AM EDT | Severe Thunderstorm Warning | TBW | Citrus, Hernando | 36 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 00:00Z, 4.3 hours before the alert went out and 102 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
- 1177 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 1408 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 122 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 3.8
The text
As transmitted.
238
WWUS20 KWNS 060412
SEL1
SPC WW 060412
FLZ000-GAZ000-CWZ000-061200-
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 131
NWS Storm Prediction Center Norman OK
1210 AM EDT Thu Apr 6 2017
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
northern Florida
southern Georgia
Coastal Waters
* Effective this Thursday morning from 1210 AM until 800 AM EDT.
* Primary threats include...
A few tornadoes possible
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Isolated damaging wind gusts to 70 mph possible
SUMMARY...Storms are expected to intensify as they develop northeast
through northern Florida into southern Georgia with supercells and
bowing segments posing a risk for a few tornadoes, damaging wind and
large hail.
The tornado watch area is approximately along and 80 statute miles
east and west of a line from 45 miles north northwest of
Jacksonville FL to 75 miles south southwest of Ocala FL. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU1).
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.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 129...WW 130...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 2 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 24035.
...DialSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 5, 11:15 PM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Duval and 8 more | 2 hr |
| Apr 6, 3:12 AM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Citrus, Clay, Columbia and 25 more | 2 hr |
| Apr 6, 6:10 AM EDT | Mesoscale Discussion | SPC | Hardee, Hillsborough, Lake, Manatee, Orange, Osceola and 4 more | 2 hr |
| Apr 5, 9:58 PM EDT | Tornado Watch | SPC | Bibb, Butts, Chattahoochee, Clayton, Coweta, Crawford and 27 more | 3 hr |
| Apr 5, 11:34 PM EDT | Mesoscale Discussion | SPC | Elbert, Lincoln, Wilkes | 56 min |
| Apr 5, 11:50 PM EDT | Severe Thunderstorm Watch | SPC | Baldwin, Bleckley, Burke, Clarke, Columbia, Elbert and 24 more | 6 hr |
| Apr 6, 2:54 AM EDT | Mesoscale Discussion | SPC | Burke, Columbia, Dodge, Emanuel, Jefferson, Jenkins and 4 more | 96 min |
Nearby
Tornado Watches in Florida, 2017Tornado Watches in Georgia, 2017Every tornado watch in 2017
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.