Alert archive / Florida / Tornado Watches in 1997

Tornado Watch 191

April 23, 199725 counties in Florida

The Storm Prediction Center issued this tornado watch at Apr 23, 1997, 11:45 AM EDT for 25 counties in Florida. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 23, 1997, 11:45 AM EDT (15:45 UTC)
Expired
Apr 23, 1997, 6:00 PM EDT
In force
6 hr
Issued by
the Storm Prediction Center
All 25 counties

Brevard County, FL, Charlotte 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, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Pasco County, FL, Pinellas County, FL, Polk County, FL, Saint Lucie County, FL, Sarasota County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 62 km from the middle of the area, began a volume at 15:47 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

18 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Apr 23, 11:52 AM EDTSevere Thunderstorm WarningMLBOsceola63 min
Apr 23, 11:59 AM EDTSevere Thunderstorm WarningTBWPolk61 min
Apr 23, 12:04 PM EDTSevere Thunderstorm WarningTBWPinellas56 min
Apr 23, 12:26 PM EDTTornado WarningTBWHillsborough49 min
Apr 23, 12:27 PM EDTSevere Thunderstorm WarningMLBBrevard58 min
Apr 23, 12:33 PM EDTSevere Thunderstorm WarningTBWManatee57 min
Apr 23, 12:51 PM EDTSevere Thunderstorm WarningMLBIndian River, Osceola64 min
Apr 23, 12:59 PM EDTSevere Thunderstorm WarningTBWPolk61 min
Apr 23, 1:20 PM EDTTornado WarningMLBIndian River50 min
Apr 23, 1:20 PM EDTSevere Thunderstorm WarningTBWHillsborough, Pinellas55 min
Apr 23, 2:05 PM EDTSevere Thunderstorm WarningTBWHardee55 min
Apr 23, 2:22 PM EDTSevere Thunderstorm WarningTBWManatee53 min
Apr 23, 2:30 PM EDTSevere Thunderstorm WarningTBWHighlands60 min
Apr 23, 2:33 PM EDTTornado WarningTBWSarasota42 min
Apr 23, 3:12 PM EDTSevere Thunderstorm WarningTBWManatee, Sarasota63 min
Apr 23, 3:45 PM EDTSevere Thunderstorm WarningTBWDeSoto, Hardee, Highlands60 min
Apr 23, 4:11 PM EDTSevere Thunderstorm WarningTBWCharlotte, Sarasota64 min
Apr 23, 4:52 PM EDTSevere Thunderstorm WarningTBWDeSoto, Highlands68 min

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 3.8 hours before the alert went out and 116 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 1997-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2247 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 1997-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 190 square meters per square second.19395878Sfc1 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
2247 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
587 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
190 m²/s²
0-3 km storm-relative helicity
250 m²/s²
Significant tornado parameter
1.8
Supercell composite
9.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

023 
WWUS9 KMKC 231526
SEL1  
MKC WW 231526
FLZ000-232200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 191
STORM PREDICTION CENTER NORMAN OK
1126 AM EDT WED APR 23 1997

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR ALL OR PORTIONS OF

   CENTRAL AND SOUTHERN FLORIDA                            
   AND ADJACENT COASTAL WATERS

EFFECTIVE THIS WEDNESDAY MORNING AND EVENING FROM 1145 AM UNTIL 600
PM EDT.

THIS IS A PARTICULARLY DANGEROUS SITUATION WITH THE POSSIBILITY OF
VERY DAMAGING TORNADOES.  ALSO...LARGE HAIL TO 2 INCHES IN
DIAMETER...THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS
LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 85 STATUTE MILES EITHER SIDE OF
A LINE FROM 45 MILES WEST NORTHWEST OF ORLANDO FLORIDA TO 65 MILES
EAST OF FORT MEYERS FLORIDA.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO WATCH
NUMBER 190.  WATCH NUMBER 190 WILL NOT BE IN EFFECT AFTER 1145 AM
EDT.  

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.

DISCUSSION...SEVERE THUNDERSTORMS...WITH A HISTORY OF DAMAGING
TORNADOES...WILL CONTIUE AS OUTFLOW BOUNDARY MOVES INTO REGION OF
VERY UNSTABLE AIR. 40 KT LOW LEVEL JET COMBINED WITH 60 KT MID
LEVEL FLOW WILL PROVIDE FAVORABLE SHEAR FOR CONTINUED TORNADO
THREAT AS CAPES FROM 3000 TO 4000 J/KG.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 26030.


...ROGASH

292,0804 270,0793 260,0820 281,0831

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 22, 10:00 PM EDTTornado WatchSPCEscambia, Holmes, Jackson, Okaloosa, Santa Rosa, Walton and 1 more6 hr
Apr 23, 3:00 AM EDTTornado WatchSPCBaker, Bradford, Calhoun, Clay, Columbia, Dixie and 17 more6 hr
Apr 23, 8:00 AM EDTTornado WatchSPCAlachua, Bradford, Brevard, Citrus, Clay, Dixie and 20 more6 hr
Apr 23, 5:00 PM EDTTornado WatchSPCBroward, Charlotte, Collier, DeSoto, Glades, Hardee and 11 more6 hr

Nearby

Tornado Watches in Florida, 1997Every tornado watch in 1997

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.