Alert archive / Florida / Tornado Watches in 2007

Tornado Watch 48

March 1, 200729 counties in Florida; 26 counties in Georgia; 8 counties in South Carolina

The Storm Prediction Center issued this tornado watch at Mar 1, 2007, 4:35 PM EST for 29 counties in Florida; 26 counties in Georgia; 8 counties in South Carolina. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued
Mar 1, 2007, 4:35 PM EST (21:35 UTC)
Expired
Mar 2, 2007, 2:00 AM EST
In force
9 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 63 counties

Alachua County, FL, Baker County, FL, Bradford County, FL, Brevard County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Hamilton County, FL, Highlands County, FL, Indian River County, FL, Lake County, FL, Levy County, FL, Marion County, FL, Martin County, FL, Nassau County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Polk County, FL, Putnam County, FL, Saint Johns County, FL, Saint Lucie County, FL, Seminole County, FL, Sumter County, FL, Suwannee County, FL, Union County, FL, Volusia County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Brantley County, GA, Bryan County, GA, Bulloch County, GA, Camden County, GA, Candler County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Coffee County, GA, Echols County, GA, Effingham County, GA, Evans County, GA, Glynn County, GA, Jeff Davis County, GA, Jenkins County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Pierce County, GA, Screven County, GA, Tattnall County, GA, Ware County, GA, Wayne County, GA, Allendale County, SC, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC, Hampton County, SC, Jasper County, SC

The radar

The Jacksonville radar (KJAX), 97 km from the middle of the area, began a volume at 21:38 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
70%
One or more EF2 to EF5 tornadoes
30%
Ten or more severe wind reports
70%
One or more gusts of 65 knots or more
30%
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
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Mar 2, 1:44 AM ESTTornado WarningJAXCoffee, Jeff Davis46 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 12:00Z, 9.6 hours before the alert went out and 99 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 12:00Z on 2007-03-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 109 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, Jacksonville, FL at 12:00Z on 2007-03-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 200 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
109 J/kg
Mixed-layer CIN
-112 J/kg
Mixed-layer LCL
805 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
200 m²/s²
0-3 km storm-relative helicity
272 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

000
WWUS20 KWNS 012136
SEL8  
SPC WW 012136
FLZ000-GAZ000-SCZ000-CWZ000-020700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 48
NWS STORM PREDICTION CENTER NORMAN OK
435 PM EST THU MAR 1 2007

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

       CENTRAL AND NORTHEAST FLORIDA
       EASTERN GEORGIA
       PARTS OF SOUTH CAROLINA
       COASTAL WATERS

EFFECTIVE THIS THURSDAY AFTERNOON AND FRIDAY MORNING FROM 435 PM
UNTIL 200 AM EST.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES EAST SOUTHEAST OF
SARASOTA FLORIDA TO 65 MILES WEST NORTHWEST OF CHARLESTON SOUTH
CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

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 44...WW 45...WW 46...WW
47...

DISCUSSION...THUNDERSTORMS EXPECTED TO INCREASE ACROSS WATCH AREA AS
AIR MASS CONTINUES TO DESTABILIZE AND WIND PROFILES INTENSIFY. 
WHILE PRIMARY THREAT OF ORGANIZED SEVERE STORMS/SUPERCELLS WILL
LIKELY OCCUR AFTER 00Z WHEN STRONG JET APPROACHES FROM THE
WEST...MORE ISOLATED TORNADIC SUPERCELLS COULD DEVELOP AS TH
CONFLUENCE FLOW NRN/CENTRAL FL.

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 24040.


...HALES

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 1, 3:57 AM ESTMesoscale DiscussionSPCBay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 9 more2 hr
Mar 1, 8:28 AM ESTTornado Watch PDSSPCEscambia, Santa Rosa12 hr
Mar 1, 9:58 AM ESTMesoscale DiscussionSPCCalhoun, Gadsden, Holmes, Jackson, Leon, Liberty and 2 more2 hr
Mar 1, 10:47 AM ESTTornado Watch PDSSPCBay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 12 more10 hr
Mar 1, 12:39 PM ESTMesoscale DiscussionSPCEscambia, Holmes, Okaloosa, Santa Rosa2 hr
Mar 1, 3:59 PM ESTMesoscale DiscussionSPCAlachua, Baker, Bradford, Clay, Columbia, Duval and 12 more2 hr
Mar 1, 6:22 PM ESTMesoscale DiscussionSPCBay, Calhoun, Dixie, Escambia, Franklin, Gadsden and 18 more83 min
Mar 1, 2:40 PM ESTMesoscale DiscussionSPCClay, Early, Randolph65 min
Mar 1, 3:41 PM ESTMesoscale DiscussionSPCChattahoochee, Clay, Harris, Heard, Muscogee, Quitman and 3 more94 min

Nearby

Tornado Watches in Florida, 2007Tornado Watches in Georgia, 2007Tornado Watches in South Carolina, 2007Every tornado watch in 2007

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.