Alert archive / Florida / Tornado Watches in 2014

Tornado Watch 42

March 29, 201424 counties in Florida

The Storm Prediction Center issued this tornado watch at Mar 29, 2014, 9:43 AM EDT for 24 counties in Florida. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Mar 29, 2014, 9:43 AM EDT (13:43 UTC)
Expired
Mar 29, 2014, 5:00 PM EDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 24 counties

Alachua County, FL, Brevard County, FL, Citrus County, FL, Flagler County, FL, Gilchrist County, FL, Hardee County, FL, Hernando County, FL, Hillsborough County, FL, Indian River County, FL, Lake County, FL, Levy County, FL, Manatee County, FL, Marion County, FL, Orange County, FL, Osceola County, FL, Pasco County, FL, Pinellas County, FL, Polk County, FL, Putnam County, FL, Saint Johns County, FL, Sarasota County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL

The radar

The Tampa radar (KTBW), 127 km from the middle of the area, began a volume at 13:45 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
60%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Mar 29, 11:13 AM EDTSevere Thunderstorm WarningTBWCitrus, Hernando47 min
Mar 29, 11:33 AM EDTSevere Thunderstorm WarningJAXAlachua, Clay, Putnam42 min
Mar 29, 11:46 AM EDTTornado WarningTBWCitrus, Hernando29 min
Mar 29, 11:59 AM EDTSevere Thunderstorm WarningTBWCitrus, Hernando, Sumter46 min
Mar 29, 12:49 PM EDTSevere Thunderstorm WarningMLBLake, Orange56 min
Mar 29, 1:03 PM EDTSevere Thunderstorm WarningMLBLake, Orange, Seminole, Volusia57 min
Mar 29, 1:07 PM EDTSevere Thunderstorm WarningMLBLake, Orange, Osceola53 min
Mar 29, 1:23 PM EDTSevere Thunderstorm WarningMLBLake, Volusia52 min
Mar 29, 1:27 PM EDTSevere Thunderstorm WarningTBWPinellas48 min
Mar 29, 1:30 PM EDTTornado WarningMLBLake, Orange, Seminole60 min
Mar 29, 1:52 PM EDTSevere Thunderstorm WarningTBWPolk38 min
Mar 29, 2:00 PM EDTSevere Thunderstorm WarningMLBVolusia45 min
Mar 29, 2:09 PM EDTSevere Thunderstorm WarningMLBOrange, Osceola51 min
Mar 29, 2:12 PM EDTTornado WarningMLBBrevard, Orange, Osceola63 min
Mar 29, 2:50 PM EDTSevere Thunderstorm WarningMLBBrevard, Indian River, Osceola55 min
Mar 29, 3:10 PM EDTSevere Thunderstorm WarningTBWPolk35 min
Mar 29, 3:12 PM EDTSevere Thunderstorm WarningMLBBrevard33 min
Mar 29, 3:49 PM EDTSevere Thunderstorm WarningMLBBrevard, Indian River, Okeechobee, Osceola, Saint Lucie41 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, 1.7 hours before the alert went out and 127 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 12:00Z on 2014-03-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1212 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tampa Bay, FL at 12:00Z on 2014-03-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 344 square meters per square second.1939587897Sfc1 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
1212 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
736 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
344 m²/s²
0-3 km storm-relative helicity
461 m²/s²
Significant tornado parameter
2.3
Supercell composite
11.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

552 
WWUS20 KWNS 291342
SEL2  
SPC WW 291342
FLZ000-CWZ000-292100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 42
NWS STORM PREDICTION CENTER NORMAN OK
945 AM EDT SAT MAR 29 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  CENTRAL FLORIDA
  COASTAL WATERS

* EFFECTIVE THIS SATURDAY MORNING AND AFTERNOON FROM 945 AM UNTIL
  500 PM EDT.

* PRIMARY THREATS INCLUDE...
  SEVERAL TORNADOES POSSIBLE
  SEVERAL LARGE HAIL EVENTS LIKELY WITH A FEW VERY LARGE HAIL
    EVENTS TO 2 INCHES IN DIAMETER POSSIBLE
  SEVERAL DAMAGING WIND GUSTS TO 70 MPH LIKELY

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 10 MILES NORTHEAST OF
GAINESVILLE FLORIDA TO 20 MILES SOUTH SOUTHWEST OF AVON PARK
FLORIDA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

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.

&&

DISCUSSION...SCATTERED THUNDERSTORMS CURRENTLY OVER THE GULF OF
MEXICO WILL TRACK EASTWARD AND ACROSS CENTRAL FL TODAY.  BREAKS IN
THE CLOUDS COUPLED WITH DEWPOINTS IN THE 70S WILL YIELD MODERATE
INSTABILITY...WHILE LOW LEVEL VERTICAL SHEAR IS FAVORABLE FOR
SUPERCELL STRUCTURES.  LARGE HAIL...DAMAGING WINDS...AND ISOLATED
TORNADOES ARE POSSIBLE.

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 27030.


...HART

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 29, 5:58 AM EDTMesoscale DiscussionSPCBaker, Columbia, Dixie, Franklin, Gilchrist, Gulf and 9 more2 hr
Mar 29, 8:10 AM EDTMesoscale DiscussionSPCCitrus, Flagler, Hernando, Hillsborough, Lake, Levy and 8 more2 hr
Mar 29, 11:38 AM EDTMesoscale DiscussionSPCBrevard, Citrus, Clay, Duval, Flagler, Hardee and 15 more97 min
Mar 29, 2:25 PM EDTMesoscale DiscussionSPCBrevard, Charlotte, Collier, DeSoto, Glades, Hardee and 16 more95 min
Mar 29, 3:42 PM EDTSevere Thunderstorm WatchSPCBroward, Collier, Glades, Hendry, Martin, Miami-Dade and 4 more6 hr
Mar 29, 7:25 PM EDTMesoscale DiscussionSPCBroward, Miami-Dade, Monroe2 hr

Nearby

Tornado Watches in Florida, 2014Every tornado watch in 2014

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.