Alert archive / Florida / Tornado Watches in 2004
Tornado Watch 804
The Storm Prediction Center issued this tornado watch at Sep 6, 2004, 7:55 AM EDT for 27 counties in Florida. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 6, 2004, 7:55 AM EDT (11:55 UTC)
- Expired
- Sep 6, 2004, 2:00 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 27 counties
Brevard County, FL, Charlotte County, FL, Citrus County, FL, DeSoto County, FL, Glades County, FL, Hardee County, FL, Hendry County, FL, Hernando County, FL, Highlands County, FL, Hillsborough County, FL, Indian River County, FL, Lake County, FL, Lee County, FL, Levy County, FL, Manatee County, FL, Marion County, FL, Martin County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Palm Beach County, FL, Pasco County, FL, Polk County, FL, Saint Lucie County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL
The radar
The Melbourne radar (KMLB), 61 km from the middle of the area, began a volume at 11:56 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 |
|---|---|---|---|---|
| Sep 6, 7:59 AM EDT | Tornado Warning | TBW | DeSoto, Highlands, Polk | 61 min |
| Sep 6, 8:01 AM EDT | Tornado Warning | MLB | Osceola | 59 min |
| Sep 6, 8:32 AM EDT | Tornado Warning | TBW | Hardee, Hillsborough, Manatee, Polk | 28 min |
| Sep 6, 9:04 AM EDT | Tornado Warning | TBW | Hardee, Manatee, Polk | 26 min |
| Sep 6, 9:29 AM EDT | Tornado Warning | TBW | Polk | 31 min |
| Sep 6, 9:56 AM EDT | Tornado Warning | MLB | Volusia | 34 min |
| Sep 6, 10:36 AM EDT | Tornado Warning | TBW | Hillsborough, Polk | 24 min |
| Sep 6, 10:45 AM EDT | Tornado Warning | MLB | Osceola | 60 min |
| Sep 6, 11:43 AM EDT | Tornado Warning | MLB | Volusia | 32 min |
| Sep 6, 11:45 AM EDT | Tornado Warning | MLB | Brevard, Volusia | 30 min |
| Sep 6, 11:59 AM EDT | Tornado Warning | MLB | Brevard, Orange, Volusia | 31 min |
| Sep 6, 12:06 PM EDT | Tornado Warning | MLB | Orange, Osceola | 24 min |
| Sep 6, 12:30 PM EDT | Tornado Warning | MLB | Brevard, Orange, Volusia | 60 min |
| Sep 6, 1:45 PM EDT | Tornado Warning | TBW | Polk | 30 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 00:00Z, 11.9 hours before the alert went out and 123 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
- 44 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 2432 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 52 m²/s²
- 0-3 km storm-relative helicity
- 155 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 061156
SEL4
SPC WW 061155
FLZ000-CWZ000-061800-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 804
NWS STORM PREDICTION CENTER NORMAN OK
755 AM EDT MON SEP 6 2004
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
CENTRAL FLORIDA
COASTAL WATERS
EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 755 AM UNTIL 200
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 70 STATUTE MILES EAST AND WEST
OF A LINE FROM 50 MILES WEST NORTHWEST OF DAYTONA BEACH FLORIDA TO
55 MILES EAST SOUTHEAST OF FORT MEYERS 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...CONTINUE...WW 803...
DISCUSSION...DESPITE BEING IN WAKE OF T.S. FRANCES...CONVECTION
CONTINUES TO STRENGTHEN WITH INCREASING LIGHTNING/COOLING CLOUD TOPS
FROM BAND OF STORMS ARCING SW-NE ACROSS CENTRAL FL THIS MORNING.
VWP/S INDICATE VERY STRONG LOW LEVEL SHEAR...WHICH WILL OVERSPREAD
ABUNDANTLY MOIST BOUNDARY LAYER /SFC DEW POINTS IN THE MID-UPPER
70S/. EXPECT MODEST HEATING THIS MORNING WILL FURTHER DESTABILIZE
THE AIR MASS AND STEEPEN LOW LEVEL LAPSE RATES...WHICH WILL IN TURN
INCREASE THE POTENTIAL FOR A FEW TORNADOES.
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 24040.
...EVANS
292,0803 261,0795 261,0821 292,0825SPC 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, 12:28 PM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Brevard, Charlotte, Citrus and 36 more | 92 min |
| Sep 6, 1:20 PM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Brevard, Citrus, Clay and 38 more | 7 hr |
| 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.