Alert archive / Florida / Tornado Watches in 2004
Tornado Watch 839
The Storm Prediction Center issued this tornado watch at Sep 25, 2004, 11:10 PM EDT for 20 counties in Florida. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 25, 2004, 11:10 PM EDT (03:10 UTC)
- Expired
- Sep 26, 2004, 6:00 AM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
Counties Brevard County, FL, Flagler County, FL, Glades County, FL, Hardee County, FL, Hendry County, FL, Highlands County, FL, Indian River County, FL, Lake County, FL, Marion County, FL, Martin County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Palm Beach County, FL, Polk County, FL, Putnam County, FL, Saint Lucie County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL
The radar
The Melbourne radar (KMLB), 50 km from the middle of the area, began a volume at 03:09 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
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 25, 11:58 PM EDT | Tornado Warning | MLB | Brevard | 62 min |
| Sep 26, 12:28 AM EDT | Tornado Warning | JAX | Flagler | 32 min |
| Sep 26, 12:35 AM EDT | Flash Flood Warning | MLB | Brevard, Indian River, Martin, Okeechobee, Osceola, Saint Lucie | 5 hr |
| Sep 26, 2:30 AM EDT | Flash Flood Warning | MFL | Palm Beach | 4 hr |
| Sep 26, 2:32 AM EDT | Tornado Warning | MLB | Indian River | 58 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, 3.2 hours before the alert went out and 167 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
- 77 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 681 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 148 m²/s²
- 0-3 km storm-relative helicity
- 240 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 260312
SEL9
SPC WW 260310
FLZ000-CWZ000-261000-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 839
NWS STORM PREDICTION CENTER NORMAN OK
1110 PM EDT SAT SEP 25 2004
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
EASTERN FLORIDA PENINSULA
COASTAL WATERS
EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 1110 PM
UNTIL 600 AM EDT.
TORNADOES...THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS
LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 55 STATUTE MILES EAST AND WEST
OF A LINE FROM 50 MILES NORTH NORTHWEST OF DAYTONA BEACH FLORIDA
TO 45 MILES WEST SOUTHWEST OF WEST PALM BEACH 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 838. WATCH NUMBER 838 WILL NOT BE IN EFFECT AFTER
1110 PM EDT.
DISCUSSION...HURRICANE JEANNE MOVING ONSHORE VICINITY ST. LUCIE AND
MARTIN COUNTIES. THE VERY STRONG SHEAR WILL CONTINUE THREAT OF
TROPICAL TORNADOES IN CONVECTIVE BANDS ASSOCIATED WITH JEANNE AS IT
MOVES SLOWLY INLAND.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH EXTREME
TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI
WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 07055.
...HALES
295,0802 262,0795 262,0813 295,0821SPC 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 26, 2:37 AM EDT | Mesoscale Discussion | SPC | Brevard, Flagler, Highlands, Indian River, Lake, Marion and 6 more | 113 min |
| Sep 26, 4:50 AM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Brevard, Citrus, Clay and 22 more | 12 hr |
| 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
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.