Alert archive / Florida / Tornado Watches in 2004
Tornado Watch 806
The Storm Prediction Center issued this tornado watch at Sep 6, 2004, 1:20 PM EDT for 44 counties in Florida. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 6, 2004, 1:20 PM EDT (17:20 UTC)
- Expired
- Sep 6, 2004, 8:00 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
All 44 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, Gadsden County, FL, Gilchrist County, FL, Hamilton County, FL, Hardee County, FL, Hernando County, FL, Highlands County, FL, Hillsborough County, FL, Indian River County, FL, Jefferson County, FL, Lafayette County, FL, Lake County, FL, Leon County, FL, Levy County, FL, Madison 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, Saint Lucie County, FL, Sarasota County, FL, Seminole County, FL, Sumter County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Volusia County, FL, Wakulla County, FL
The radar
The Jacksonville radar (KJAX), 139 km from the middle of the area, began a volume at 17:22 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
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 6, 1:45 PM EDT | Tornado Warning | TBW | Polk | 30 min |
| Sep 6, 6:39 PM EDT | Tornado Warning | JAX | Clay, Saint Johns | 51 min |
| Sep 6, 6:51 PM EDT | Tornado Warning | JAX | Putnam | 39 min |
| Sep 6, 7:13 PM EDT | Tornado Warning | JAX | Clay, Saint Johns | 47 min |
| Sep 6, 7:33 PM EDT | Tornado Warning | JAX | Clay | 27 min |
| Sep 6, 7:40 PM EDT | Tornado Warning | JAX | Duval, Saint Johns | 50 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, 5.3 hours before the alert went out and 141 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
- 830 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 653 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 235 m²/s²
- 0-3 km storm-relative helicity
- 235 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 4.8
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 061719
SEL6
SPC WW 061720
FLZ000-CWZ000-070000-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 806
NWS STORM PREDICTION CENTER NORMAN OK
120 PM EDT MON SEP 6 2004
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
CENTRAL AND NORTH FLORIDA
COASTAL WATERS
EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 120 PM UNTIL 800
PM EDT.
TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 60 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 95 STATUTE MILES EAST AND WEST
OF A LINE FROM 70 MILES NORTH OF CROSS CITY FLORIDA TO 30 MILES
SOUTH OF AVON PARK 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...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 804. WATCH NUMBER 804 WILL NOT BE IN EFFECT AFTER 120
PM EDT. CONTINUE...WW 805...
DISCUSSION...THE OUTER ERN RAIN BANDS ASSOCIATED WITH TROPICAL STORM
FRANCES WILL CONTINUE TO ROTATE NWD ACROSS CENTRAL/N FL THROUGH THE
AFTERNOON. DAYTIME HEATING BETWEEN THE BANDS WILL ENHANCE
INSTABILITY...WHILE VERTICAL SHEAR REMAINS SUFFICIENT FOR SUPERCELLS
CAPABLE OF PRODUCING TORNADOES.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 50 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550.
MEAN STORM MOTION VECTOR 18030.
...THOMPSON
303,0813 271,0794 271,0825 303,0844SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 8:35 PM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 21 more | 9 hr |
| Sep 6, 12:12 AM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 21 more | 2 hr |
| Sep 6, 4:06 AM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 21 more | 84 min |
| Sep 6, 4:50 AM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 11 more | 9 hr |
| Sep 6, 7:48 AM EDT | Mesoscale Discussion | SPC | Brevard, Charlotte, DeSoto, Hardee, Highlands, Lake and 8 more | 87 min |
| Sep 6, 7:55 AM EDT | Tornado Watch | SPC | Brevard, Charlotte, Citrus, DeSoto, Glades, Hardee and 21 more | 6 hr |
| Sep 6, 12:28 PM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Brevard, Charlotte, Citrus and 36 more | 92 min |
| Sep 6, 3:55 PM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Duval and 10 more | 2 hr |
| Sep 6, 7:12 PM EDT | Mesoscale Discussion | SPC | Baker, Columbia, Duval, Nassau, Union | 2 hr |
| Sep 6, 7:45 PM EDT | Tornado Watch | SPC | Bradford, Clay, Duval, Flagler, Nassau, Putnam and 1 more | 9 hr |
Nearby
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.