Alert archive / Florida / Tornado Watches in 2016

Tornado Watch 4

January 17, 201631 counties in Florida

The Storm Prediction Center issued this tornado watch at Jan 17, 2016, 12:47 AM EST for 31 counties in Florida. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Jan 17, 2016, 12:47 AM EST (05:47 UTC)
Expired
Jan 17, 2016, 8:48 AM EST
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 31 counties

Brevard County, FL, Broward County, FL, Charlotte County, FL, Citrus County, FL, Collier County, FL, DeSoto County, FL, Glades County, FL, Hardee County, FL, Hendry County, FL, Hernando County, FL, Highlands County, FL, Hillsborough County, FL, Indian River County, FL, Lake County, FL, Lee County, FL, Manatee County, FL, Martin County, FL, Miami-Dade County, FL, Monroe County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Palm Beach 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), 83 km from the middle of the area, began a volume at 05:47 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
50%
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
70%

Warnings issued inside it

26 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jan 17, 2:52 AM ESTSevere Thunderstorm WarningTBWManatee, Sarasota38 min
Jan 17, 2:56 AM ESTTornado WarningTBWManatee, Sarasota34 min
Jan 17, 3:14 AM ESTSevere Thunderstorm WarningTBWHillsborough, Pasco, Polk, Sumter31 min
Jan 17, 3:27 AM ESTSevere Thunderstorm WarningTBWHillsborough, Manatee33 min
Jan 17, 3:28 AM ESTTornado Warning Tornado observedTBWManatee32 min
Jan 17, 3:33 AM ESTSevere Thunderstorm WarningTBWManatee, Sarasota27 min
Jan 17, 3:38 AM ESTTornado WarningTBWSarasota20 min
Jan 17, 3:45 AM ESTTornado WarningTBWHardee, Hillsborough, Manatee, Polk12 min
Jan 17, 3:49 AM ESTTornado WarningTBWCharlotte, Sarasota26 min
Jan 17, 3:56 AM ESTTornado WarningTBWManatee14 min
Jan 17, 4:15 AM ESTSevere Thunderstorm WarningTBWCharlotte, Lee45 min
Jan 17, 4:15 AM ESTTornado WarningTBWDeSoto, Hardee, Manatee, Polk, Sarasota30 min
Jan 17, 4:30 AM ESTSevere Thunderstorm WarningMLBBrevard22 min
Jan 17, 4:36 AM ESTSevere Thunderstorm WarningTBWDeSoto, Hardee, Highlands, Sarasota39 min
Jan 17, 4:44 AM ESTTornado WarningTBWCharlotte, DeSoto, Sarasota31 min
Jan 17, 4:50 AM ESTSevere Thunderstorm WarningTBWHardee, Highlands, Polk55 min
Jan 17, 4:58 AM ESTSevere Thunderstorm WarningTBWCharlotte, Lee32 min
Jan 17, 5:05 AM ESTSevere Thunderstorm WarningMLBBrevard, Indian River, Okeechobee, Osceola55 min
Jan 17, 5:07 AM ESTTornado WarningTBWCharlotte23 min
Jan 17, 5:13 AM ESTSevere Thunderstorm WarningTBWDeSoto, Hardee, Highlands47 min
Jan 17, 5:17 AM ESTTornado WarningMFLCollier28 min
Jan 17, 5:40 AM ESTSevere Thunderstorm WarningMLBBrevard, Orange, Osceola50 min
Jan 17, 6:12 AM ESTSevere Thunderstorm WarningKEYMonroe63 min
Jan 17, 6:12 AM ESTTornado WarningMFLGlades, Hendry, Palm Beach33 min
Jan 17, 7:03 AM ESTTornado WarningMLBMartin14 min
Jan 17, 7:11 AM ESTSevere Thunderstorm WarningMFLPalm Beach34 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, 5.8 hours before the alert went out and 83 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.

Skew-T log-pSkew-T log-p diagram, Tampa Bay, FL at 00:00Z on 2016-01-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tampa Bay, FL at 00:00Z on 2016-01-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1407 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
106 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

476 
WWUS20 KWNS 170543
SEL4  
SPC WW 170543
FLZ000-CWZ000-171300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 4
NWS STORM PREDICTION CENTER NORMAN OK
1245 AM EST SUN JAN 17 2016

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  CENTRAL AND SOUTH FLORIDA INCLUDING THE KEYS
  COASTAL WATERS

* EFFECTIVE THIS SUNDAY MORNING FROM 1245 AM UNTIL 800 AM EST.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES POSSIBLE
  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

SUMMARY...A BAND OF INTENSE THUNDERSTORMS OVER THE GULF OF MEXICO
WILL SPREAD ACROSS THE FL PENINSULA OVERNIGHT...WHILE ISOLATED
STRONG STORMS DEVELOP OUT AHEAD.  STRONG WIND FIELDS WILL PROMOTE
THE RISK OF SEVERE WEATHER INCLUDING DAMAGING WINDS AND ISOLATED
TORNADOES.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE
MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHWEST OF ORLANDO
FLORIDA TO 25 MILES SOUTH SOUTHEAST OF MARATHON FLORIDA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU4).

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 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.
MEAN STORM MOTION VECTOR 24035.


...HART

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 16, 11:03 PM ESTMesoscale DiscussionSPCCharlotte, Collier, DeSoto, Glades, Hardee, Hendry and 7 more117 min
Jan 17, 2:31 AM ESTMesoscale DiscussionSPCBrevard, Broward, Charlotte, Citrus, Collier, DeSoto and 24 more89 min
Jan 17, 5:08 AM ESTMesoscale DiscussionSPCBrevard, Broward, Charlotte, Collier, DeSoto, Glades and 15 more2 hr
Jan 17, 6:38 AM ESTMesoscale DiscussionSPCBroward, Miami-Dade, Monroe, Palm Beach97 min

Nearby

Tornado Watches in Florida, 2016Every tornado watch in 2016

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.