Alert archive / Florida / Tornado Watches in 2013

Tornado Watch 46

February 26, 201337 counties in Florida; 14 counties in Georgia

The Storm Prediction Center issued this tornado watch at Feb 26, 2013, 6:49 AM EST for 37 counties in Florida; 14 counties in Georgia. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Feb 26, 2013, 6:49 AM EST (11:49 UTC)
Expired
Feb 26, 2013, 2:57 PM EST
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
70 kt
All 51 counties

Alachua County, FL, Baker County, FL, Bradford County, FL, Brevard County, FL, Charlotte County, FL, Citrus County, FL, Clay County, FL, Columbia County, FL, DeSoto County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Hamilton County, FL, Hardee County, FL, Hernando County, FL, Highlands County, FL, Hillsborough County, FL, Indian River County, FL, Lake County, FL, Lee County, FL, Manatee County, FL, Marion County, FL, Nassau County, FL, Okeechobee 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, Suwannee County, FL, Union County, FL, Volusia County, FL, Brantley County, GA, Bryan County, GA, Camden County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Echols County, GA, Glynn County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Pierce County, GA, Ware County, GA, Wayne County, GA

The radar

The Jacksonville radar (KJAX), 52 km from the middle of the area, began a volume at 11:52 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
40%
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
10%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Feb 26, 7:25 AM ESTSevere Thunderstorm WarningTBWCitrus, Levy65 min
Feb 26, 7:37 AM ESTSevere Thunderstorm WarningJAXColumbia, Gilchrist, Suwannee, Union68 min
Feb 26, 8:12 AM ESTSevere Thunderstorm WarningJAXAlachua, Bradford, Gilchrist, Marion, Union48 min
Feb 26, 8:19 AM ESTSevere Thunderstorm WarningJAXBaker41 min
Feb 26, 8:49 AM ESTSevere Thunderstorm WarningJAXAlachua, Marion, Putnam56 min
Feb 26, 9:00 AM ESTSevere Thunderstorm WarningJAXAlachua, Bradford, Clay, Putnam, Union60 min
Feb 26, 10:12 AM ESTTornado WarningJAXFlagler, Putnam, Saint Johns48 min
Feb 26, 10:40 AM ESTTornado WarningMLBLake20 min
Feb 26, 11:12 AM ESTSevere Thunderstorm WarningTBWHillsborough33 min
Feb 26, 11:22 AM ESTTornado WarningMLBLake38 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, 11.8 hours before the alert went out and 53 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, Jacksonville, FL at 00:00Z on 2013-02-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Jacksonville, FL at 00:00Z on 2013-02-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 171 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
435 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
171 m²/s²
0-3 km storm-relative helicity
384 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

569 
WWUS20 KWNS 261152
SEL6  
SPC WW 261152
FLZ000-GAZ000-CWZ000-262000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 46
NWS STORM PREDICTION CENTER NORMAN OK
650 AM EST TUE FEB 26 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       WESTERN...CENTRAL AND NORTHERN FLORIDA
       SOUTHEASTERN GEORGIA
       COASTAL WATERS

EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 650 AM UNTIL
300 PM EST.

TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE
MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH OF BRUNSWICK
GEORGIA TO 10 MILES SOUTHWEST OF SARASOTA FLORIDA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU6).

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 45...

DISCUSSION...BAND OF STG-SVR TSTMS...INCLUDING A FEW SUPERCELLS...IS
EVIDENT AT WW ISSUANCE TIME OVER PORTIONS FL PANHANDLE AND NERN
GULF...AND SHOULD ENCOUNTER INCREASINGLY FAVORABLE LOW-LEVEL THETAE
AS IT MOVES INLAND OVER NRN/WRN FL.  ADDITIONAL CONVECTION MAY
DEVELOP OVER NRN FL AND SERN GA...INCLUDING WARM-SECTOR ACTIVITY
THAT WOULD POSE TORNADO RISK WHILE INTERACTING WITH
DIFFUSE/NWD-MOVING WARM FRONT OVER REGION.  VWP DATA AND FCST
SOUNDINGS SHOW FAVORABLE LOW-LEVEL HODOGRAPHS WITH 300-500 J/KG 0-1
KM SRH POSSIBLE...BOTH OVER WARM SECTOR AND IN SLICE OF WARM-FRONTAL
ZONE CONTAINING SFC-BASED LIFTED PARCELS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 24035.


...EDWARDS

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 25, 8:57 PM ESTMesoscale DiscussionSPCEscambia, Santa Rosa63 min
Feb 25, 10:31 PM ESTMesoscale DiscussionSPCBay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 10 more59 min
Feb 26, 12:59 AM ESTTornado WatchSPCBay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 12 more8 hr
Feb 26, 3:51 AM ESTMesoscale DiscussionSPCCalhoun, Dixie, Gadsden, Gulf, Hamilton, Jackson and 8 more114 min
Feb 26, 6:19 AM ESTMesoscale DiscussionSPCAlachua, Baker, Bradford, Citrus, Clay, Columbia and 16 more116 min
Feb 26, 11:38 AM ESTMesoscale DiscussionSPCCharlotte, Citrus, Clay, DeSoto, Duval, Flagler and 19 more67 min
Feb 26, 8:44 AM ESTMesoscale DiscussionSPCBulloch, Effingham, Screven3 hr

Nearby

Tornado Watches in Florida, 2013Tornado Watches in Georgia, 2013Every tornado watch in 2013

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.