Alert archive / Florida / Tornado Watches in 1998
Tornado Watch 830
The Storm Prediction Center issued this tornado watch at Sep 25, 1998, 11:00 AM EDT for 29 counties in Florida. It was in force for 12 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 25, 1998, 11:00 AM EDT (15:00 UTC)
- Expired
- Sep 25, 1998, 11:00 PM EDT
- In force
- 12 hr
- Issued by
- the Storm Prediction Center
All 29 counties
Brevard County, FL, Broward County, FL, Charlotte County, FL, Citrus County, FL, Collier 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, Manatee County, FL, Martin County, FL, Miami-Dade County, FL, Monroe 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, Sarasota County, FL, Seminole County, FL, Sumter County, FL
The radar
The Melbourne radar (KMLB), 108 km from the middle of the area, began a volume at 15:00 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
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 25, 11:34 AM EDT | Tornado Warning | MLB | Indian River | 56 min |
| Sep 25, 11:46 AM EDT | Tornado Warning | TBW | Pasco | 49 min |
| Sep 25, 12:16 PM EDT | Tornado Warning | MLB | Brevard | 59 min |
| Sep 25, 12:23 PM EDT | Tornado Warning | MLB | Osceola | 57 min |
| Sep 25, 1:12 PM EDT | Tornado Warning | TBW | Pasco | 43 min |
| Sep 25, 1:15 PM EDT | Tornado Warning | MLB | Brevard | 65 min |
| Sep 25, 1:21 PM EDT | Tornado Warning | TBW | Polk | 49 min |
| Sep 25, 1:27 PM EDT | Tornado Warning | MLB | Osceola | 58 min |
| Sep 25, 1:42 PM EDT | Tornado Warning | MFL | Broward | 48 min |
| Sep 25, 2:20 PM EDT | Tornado Warning | TBW | DeSoto | 25 min |
| Sep 25, 2:23 PM EDT | Tornado Warning | TBW | Charlotte | 37 min |
| Sep 25, 6:40 PM EDT | Flash Flood Warning | MFL | Miami-Dade | 115 min |
The nearest sounding before it
Tampa Bay, FL (KTBW), launched 12:00Z, 3.0 hours before the alert went out and 144 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
- 324 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 920 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
599 WWUS9 KMKC 251420 SEL0 MKC WW 251420 FLZ000-260300- URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 830 STORM PREDICTION CENTER NORMAN OK 1020 AM EDT FRI SEP 25 1998 THE STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF SOUTHERN AND CENTRAL FLORIDA AND ADJACENT COASTAL WATERS EFFECTIVE THIS FRIDAY MORNING AND EVENING FROM 1100 AM UNTIL 1100 PM EDT. TORNADOES...THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE TORNADO WATCH AREA IS ALONG AND 80 STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHWEST OF ORLANDO FLORIDA TO 80 MILES SOUTH SOUTHWEST OF MIAMI 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 829. WATCH NUMBER 829 WILL NOT BE IN EFFECT AFTER 1100 AM EDT. DISCUSSION...BANDS OF CONVECTION ASSOCIATED WITH HURRICANE GEORGES CONTINUE TO ROTATE NWWD INTO SOUTHERN AND CENTRAL FLORIDA. LOW LEVEL SHEAR IS EXPECTED TO INCREASE INTO CENTRAL FLORIDA AS THE HURRICANE MOVES NWWD THROUGH THE EVENING HOURS...WITH POTENTIAL FOR MINIATURE SUPERCELL DEVELOPMENT. A FEW BRIEF TORNADOES ARE POSSIBLE AS THE CONVECTIVE BANDS SPREAD NWWD WITH TIME. 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 13045. ...WEISS 285,0802 244,0793 244,0820 285,0830
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 25, 6:15 AM EDT | Tornado Watch | SPC | Broward, Charlotte, Collier, DeSoto, Glades, Hendry and 9 more | 7 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.