Alert archive / Florida / Tornado Watches in 2004
Tornado Watch 748
The Storm Prediction Center issued this tornado watch at Aug 12, 2004, 9:35 PM EDT for 10 counties in Florida. It was in force for 10 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 12, 2004, 9:35 PM EDT (01:35 UTC)
- Expired
- Aug 13, 2004, 8:00 AM EDT
- In force
- 10 hr
- Issued by
- the Storm Prediction Center
Counties Broward County, FL, Charlotte County, FL, Collier County, FL, Glades County, FL, Hendry County, FL, Lee County, FL, Martin County, FL, Miami-Dade County, FL, Monroe County, FL, Palm Beach County, FL
The radar
The Miami radar (KAMX), 60 km from the middle of the area, began a volume at 01:36 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 |
|---|---|---|---|---|
| Aug 12, 9:43 PM EDT | Tornado Warning | EYW | Monroe | 62 min |
| Aug 12, 11:58 PM EDT | Severe Thunderstorm Warning | MFL | Miami-Dade | 47 min |
| Aug 13, 1:27 AM EDT | Severe Thunderstorm Warning | MFL | Broward, Miami-Dade | 63 min |
| Aug 13, 1:29 AM EDT | Severe Thunderstorm Warning | MFL | Collier | 46 min |
| Aug 13, 2:54 AM EDT | Severe Thunderstorm Warning | MFL | Glades | 21 min |
| Aug 13, 5:49 AM EDT | Tornado Warning | EYW | Monroe | 26 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
Miami, FL (KMFL), launched 00:00Z, 1.6 hours before the alert went out and 62 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
- 2493 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 1169 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 46 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 130134
SEL8
SPC WW 130135
FLZ000-CWZ000-131200-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 748
NWS STORM PREDICTION CENTER NORMAN OK
935 PM EDT THU AUG 12 2004
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTH FLORIDA
COASTAL WATERS
EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 935 PM UNTIL
800 AM 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 75 STATUTE MILES EAST AND WEST
OF A LINE FROM 50 MILES NORTHEAST OF FORT MEYERS FLORIDA TO 60
MILES EAST SOUTHEAST OF KEY WEST 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 746...WW 747...
DISCUSSION...OUTER BANDS OF HURRICANE CHARLEY WILL BEGIN TO AFFECT
THE FL KEYS IN THE NEXT COUPLE OF HOURS...AND INTO SOUTH FL
OVERNIGHT. VERTICAL SHEAR PROFILES WILL INCREASE RAPIDLY...WITH AN
INCREASING RISK OF ISOLATED 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 550.
MEAN STORM MOTION VECTOR 16030.
...HART
270,0800 241,0794 241,0820 270,0823SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 9:00 PM EDT | Mesoscale Discussion | SPC | Charlotte, Collier, Hendry, Lee, Miami-Dade, Monroe | 3 hr |
| Aug 13, 2:21 AM EDT | Mesoscale Discussion | SPC | Broward, Charlotte, Collier, Glades, Hendry, Lee and 4 more | 114 min |
| Aug 13, 6:46 AM EDT | Mesoscale Discussion | SPC | Broward, Charlotte, Collier, DeSoto, Glades, Hardee and 15 more | 119 min |
| Aug 13, 7:30 AM EDT | Tornado Watch | SPC | Broward, Charlotte, Collier, DeSoto, Glades, Hardee and 15 more | 10 hr |
| Aug 13, 11:04 AM EDT | Mesoscale Discussion | SPC | Broward, Charlotte, Collier, DeSoto, Glades, Hardee and 15 more | 86 min |
| Aug 13, 1:02 PM EDT | Mesoscale Discussion | SPC | Brevard, Broward, Charlotte, Citrus, Collier, DeSoto and 26 more | 88 min |
| Aug 13, 1:45 PM EDT | Tornado Watch | SPC | Alachua, Brevard, Broward, Charlotte, Citrus, Collier and 29 more | 12 hr |
| Aug 13, 4:06 PM EDT | Mesoscale Discussion | SPC | Alachua, Brevard, Broward, Charlotte, Citrus, Collier and 29 more | 84 min |
| Aug 13, 6:14 PM EDT | Mesoscale Discussion | SPC | Broward, Citrus, Collier, Glades, Hardee, Hendry and 14 more | 61 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.