Alert archive / Florida / Tornado Watches in 1998

Tornado Watch 830

September 25, 199829 counties in Florida

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.

IssuedProductOfficeCountiesLasted
Sep 25, 11:34 AM EDTTornado WarningMLBIndian River56 min
Sep 25, 11:46 AM EDTTornado WarningTBWPasco49 min
Sep 25, 12:16 PM EDTTornado WarningMLBBrevard59 min
Sep 25, 12:23 PM EDTTornado WarningMLBOsceola57 min
Sep 25, 1:12 PM EDTTornado WarningTBWPasco43 min
Sep 25, 1:15 PM EDTTornado WarningMLBBrevard65 min
Sep 25, 1:21 PM EDTTornado WarningTBWPolk49 min
Sep 25, 1:27 PM EDTTornado WarningMLBOsceola58 min
Sep 25, 1:42 PM EDTTornado WarningMFLBroward48 min
Sep 25, 2:20 PM EDTTornado WarningTBWDeSoto25 min
Sep 25, 2:23 PM EDTTornado WarningTBWCharlotte37 min
Sep 25, 6:40 PM EDTFlash Flood WarningMFLMiami-Dade115 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.

Skew-T log-pSkew-T log-p diagram, Tampa Bay, FL at 12:00Z on 1998-09-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 324 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tampa Bay, FL at 12:00Z on 1998-09-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 6 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

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.

IssuedProductOfficeCountiesLasted
Sep 25, 6:15 AM EDTTornado WatchSPCBroward, Charlotte, Collier, DeSoto, Glades, Hendry and 9 more7 hr

Nearby

Tornado Watches in Florida, 1998Every tornado watch in 1998

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.