Alert archive / Florida / Tornado Watches in 2004
Tornado Watch 840
The Storm Prediction Center issued this tornado watch at Sep 26, 2004, 4:50 AM EDT for 28 counties in Florida; 8 counties in Georgia. It was in force for 12 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 26, 2004, 4:50 AM EDT (08:50 UTC)
- Expired
- Sep 26, 2004, 5:00 PM EDT
- In force
- 12 hr
- Issued by
- the Storm Prediction Center
All 36 counties
Alachua County, FL, Baker County, FL, Bradford County, FL, Brevard County, FL, Citrus County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Hamilton County, FL, Hernando County, FL, Hillsborough County, FL, Indian River County, FL, Lake County, FL, Levy County, FL, Marion County, FL, Nassau County, FL, Orange County, FL, Osceola County, FL, Pasco County, FL, Polk County, FL, Putnam County, FL, Saint Johns County, FL, Seminole County, FL, Sumter County, FL, Union County, FL, Volusia County, FL, Brantley County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Echols County, GA, Glynn County, GA, Lanier County, GA, Ware County, GA
The radar
The Jacksonville radar (KJAX), 77 km from the middle of the area, began a volume at 08:52 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.
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 26, 9:50 AM EDT | Flash Flood Warning | TBW | Polk | 85 min |
| Sep 26, 11:43 AM EDT | Tornado Warning | JAX | Flagler | 47 min |
| Sep 26, 11:47 AM EDT | Flash Flood Warning | TBW | Hardee, Highlands, Hillsborough, Manatee, Pasco, Polk and 1 more | 8 hr |
| Sep 26, 12:01 PM EDT | Flash Flood Warning | MLB | Brevard, Lake, Orange, Osceola, Seminole, Volusia | 6 hr |
| Sep 26, 2:34 PM EDT | Tornado Warning | JAX | Saint Johns | 41 min |
| Sep 26, 3:40 PM EDT | Flash Flood Warning | TBW | Citrus, Hernando, Levy, Sumter | 4 hr |
| Sep 26, 4:46 PM EDT | Tornado Warning | JAX | Nassau | 14 min |
| Sep 26, 4:59 PM EDT | Tornado Warning | JAX | Nassau | 16 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, 8.8 hours before the alert went out and 79 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
- 6 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 570 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 212 m²/s²
- 0-3 km storm-relative helicity
- 302 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 260916
SEL0
SPC WW 260850
FLZ000-GAZ000-CWZ000-262100-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 840
NWS STORM PREDICTION CENTER NORMAN OK
450 AM EDT SUN SEP 26 2004
CORRECTED FOR HURRICANE NAME
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
CENTRAL AND NORTH FLORIDA
SOUTHEAST GEORGIA
COASTAL WATERS
EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 450 AM UNTIL 500
PM EDT.
TORNADOES...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS
LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 75 STATUTE MILES EAST AND WEST
OF A LINE FROM 25 MILES WEST NORTHWEST OF BRUNSWICK GEORGIA TO 5
MILES WEST 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 839. WATCH NUMBER 839 CORR 1
AM EDT.
DISCUSSION...HURRICANE JEANNE CONTINUES TO MOVE WNWWD ACROSS
CENTRAL FL...WITH A GRADUAL TURN MORE TO THE NW EXPECTED TODAY. THE
TORNADO THREAT WILL INITIALLY BE SOMEWHAT LIMITED EARLY THIS MORNING
IN THE VICINITY OF THE STORM CORE. HOWEVER...THE TORNADO THREAT IS
EXPECTED TO INCREASE SOME DURING THE MORNING FROM THE CAPE CANAVERAL
AREA NWD ALONG THE NE FL COAST AS MORE DISCRETE CONVECTIVE CELLS
WITHIN THE OUTER BANDS BEGIN TO MOVE ONSHORE. THE THREAT FOR A
COUPLE OF TORNADOES SHOULD ALSO GRADUALLY SPREAD NWD AND INLAND TO
SE GA BY LATE MORNING OR EARLY AFTERNOON.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH EXTREME
TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI
WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 12040.
...THOMPSON
311,0803 273,0801 273,0823 311,0830SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 25, 8:48 PM EDT | Mesoscale Discussion | SPC | Brevard, Flagler, Glades, Hendry, Highlands, Indian River and 10 more | 117 min |
| Sep 25, 11:10 PM EDT | Tornado Watch | SPC | Brevard, Flagler, Glades, Hardee, Hendry, Highlands and 14 more | 7 hr |
| Sep 26, 2:37 AM EDT | Mesoscale Discussion | SPC | Brevard, Flagler, Highlands, Indian River, Lake, Marion and 6 more | 113 min |
| Sep 26, 8:21 AM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Brevard, Citrus, Clay and 18 more | 114 min |
| Sep 26, 11:13 AM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Brevard, Citrus, Clay and 22 more | 2 hr |
| Sep 26, 3:11 PM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Brevard, Citrus, Clay and 22 more | 2 hr |
| Sep 26, 4:25 PM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Clay, Columbia, Duval and 8 more | 9 hr |
| Sep 26, 7:16 PM EDT | Mesoscale Discussion | SPC | Baker, Duval, Nassau | 119 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.