Alert archive / Florida / Tornado Watches in 2004
Tornado Watch 744
The Storm Prediction Center issued this tornado watch at Aug 12, 2004, 1:50 PM EDT for 36 counties in Florida; 25 counties in Georgia. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 12, 2004, 1:50 PM EDT (17:50 UTC)
- Expired
- Aug 12, 2004, 9:00 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
All 61 counties
Alachua County, FL, Baker County, FL, Bradford County, FL, Brevard 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, Hardee County, FL, Hernando County, FL, Hillsborough County, FL, Indian River County, FL, Lafayette County, FL, Lake County, FL, Levy County, FL, Madison County, FL, Manatee County, FL, Marion County, FL, Nassau County, FL, Orange County, FL, Osceola County, FL, Pasco County, FL, Pinellas County, FL, Polk 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, Appling County, GA, Atkinson County, GA, Bacon County, GA, Ben Hill County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Coffee County, GA, Cook County, GA, Echols County, GA, Glynn County, GA, Irwin County, GA, Jeff Davis County, GA, Lanier County, GA, Liberty County, GA, Long County, GA, Lowndes County, GA, McIntosh County, GA, Pierce County, GA, Tift County, GA, Ware County, GA, Wayne County, GA
The radar
The Jacksonville radar (KJAX), 152 km from the middle of the area, began a volume at 17:54 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.
Warnings issued inside it
14 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 2:26 PM EDT | Severe Thunderstorm Warning | MLB | Brevard | 49 min |
| Aug 12, 2:33 PM EDT | Tornado Warning | JAX | Bradford, Union | 27 min |
| Aug 12, 3:03 PM EDT | Tornado Warning | JAX | Baker, Clay, Duval | 27 min |
| Aug 12, 3:13 PM EDT | Severe Thunderstorm Warning | JAX | Putnam | 47 min |
| Aug 12, 3:57 PM EDT | Severe Thunderstorm Warning | JAX | Saint Johns | 33 min |
| Aug 12, 4:01 PM EDT | Tornado Warning | JAX | Duval | 44 min |
| Aug 12, 4:24 PM EDT | Tornado Warning | JAX | Nassau | 21 min |
| Aug 12, 5:55 PM EDT | Tornado Warning | JAX | Flagler | 35 min |
| Aug 12, 6:09 PM EDT | Tornado Warning | JAX | Wayne | 36 min |
| Aug 12, 6:21 PM EDT | Tornado Warning | CHS | Liberty, Long | 24 min |
| Aug 12, 6:42 PM EDT | Tornado Warning | CHS | Liberty, Long, McIntosh | 33 min |
| Aug 12, 7:16 PM EDT | Tornado Warning | CHS | Liberty, McIntosh | 29 min |
| Aug 12, 7:29 PM EDT | Flash Flood Warning | CHS | Candler, Liberty, Tattnall | 26 days |
| Aug 12, 7:35 PM EDT | Severe Thunderstorm Warning | CHS | Bryan, Chatham, Liberty | 25 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, 5.8 hours before the alert went out and 154 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
- 877 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 900 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 75 m²/s²
- 0-3 km storm-relative helicity
- 93 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 121752
SEL4
SPC WW 121750
FLZ000-GAZ000-CWZ000-130100-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 744
NWS STORM PREDICTION CENTER NORMAN OK
ISSUED BY AFWA OFFUTT AIR FORCE BASE BELLEVUE NE
150 PM EDT THU AUG 12 2004
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
CENTRAL AND NORTHERN FLORIDA
SOUTHEAST GEORGIA
COASTAL WATERS
EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 150 PM UNTIL
900 PM EDT.
TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 120 STATUTE MILES EAST AND
WEST OF A LINE FROM 50 MILES NORTH OF BRUNSWICK GEORGIA TO 50
MILES SOUTHEAST OF SAINT PETERSBURG FLORIDA.
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... WATCH NUMBER WILL NOT BE IN EFFECT
AFTER 150 PM EDT. CONTINUE...WW 743...
DISCUSSION...THREAT FOR ISOLD TORNADOES ARE EXPECTED TO PERSIST
THROUGH EARLY EVENING AS REMNANTS OF TROPICAL STORM BONNIE MOVES
ONSHORE.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 24035.
...AFWA
315,0792 272,0800 272,0840 315,0832SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 8:00 AM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bay, Bradford, Calhoun, Columbia and 18 more | 3 hr |
| Aug 12, 8:50 AM EDT | Tornado Watch | SPC | Alachua, Baker, Bay, Bradford, Calhoun, Clay and 23 more | 5 hr |
| Aug 12, 12:50 PM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 19 more | 55 min |
| Aug 12, 7:02 PM EDT | Mesoscale Discussion | SPC | Brevard, Clay, Duval, Flagler, Hardee, Indian River and 9 more | 88 min |
| Aug 12, 4:09 AM EDT | Mesoscale Discussion | SPC | Barrow, Bartow, Carroll, Cherokee, Clayton, Cobb and 14 more | 3 hr |
| Aug 12, 10:02 AM EDT | Mesoscale Discussion | SPC | Bleckley, Bulloch, Burke, Candler, Columbia, Effingham and 13 more | 88 min |
| Aug 12, 11:45 AM EDT | Tornado Watch | SPC | Bleckley, Bryan, Bulloch, Burke, Candler, Chatham and 25 more | 6 hr |
| Aug 12, 4:06 PM EDT | Mesoscale Discussion | SPC | Bryan, Bulloch, Candler, Chatham, Effingham, Evans and 6 more | 84 min |
Nearby
Tornado Watches in Florida, 2004Tornado Watches in Georgia, 2004Every tornado watch in 2004
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.