Alert archive / Florida / Tornado Watches in 1997

Tornado Watch 781

October 27, 199721 counties in Florida

The Storm Prediction Center issued this tornado watch at Oct 27, 1997, 10:00 AM EST for 21 counties in Florida. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Oct 27, 1997, 10:00 AM EST (15:00 UTC)
Expired
Oct 27, 1997, 4:00 PM EST
In force
6 hr
Issued by
the Storm Prediction Center
All 21 counties

Brevard County, FL, Charlotte County, FL, DeSoto County, FL, Glades County, FL, Hardee 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

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Oct 27, 10:01 AM ESTSevere Thunderstorm WarningTBWPolk29 min
Oct 27, 10:07 AM ESTTornado WarningMLBOsceola58 min
Oct 27, 10:27 AM ESTSevere Thunderstorm WarningTBWHillsborough, Manatee48 min

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 3.0 hours before the alert went out and 55 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 1997-10-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2501 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 1997-10-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 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
2501 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
494 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
2.3
Supercell composite
8.7

Open this sounding in Storm Lab

The text

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

818 
WWUS9 KMKC 271426
SEL1  
MKC WW 271426
FLZ000-272100-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 781
STORM PREDICTION CENTER NORMAN OK
926 AM EST MON OCT 27 1997

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

   CENTRAL FLORIDA                            
   AND ADJACENT COASTAL WATERS

EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 1000 AM UNTIL 400
PM EST.

TORNADOES...HAIL TO 1 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 75 STATUTE MILES EITHER SIDE OF
A LINE FROM 10 MILES WEST SOUTHWEST OF SARASOTA FLORIDA TO 15 MILES
EAST SOUTHEAST OF MELBOURNE 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.


DISCUSSION...THUNDERSTORMS INCREASING OVER CENTRAL FLORIDA AND
EASTERN GULF AS COLD FRONT ADVANCES INTO REGION OF 2000 TO 3000
J/KG CAPES. WIND SHEAR PROFILES FAVOR DAMAGING DOWNBURSTS AND
ISOLATED TORNADOES. 

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 24045.


...ROGASH

282,0830 290,0804 265,0800 261,0821

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 26, 11:00 PM ESTSevere Thunderstorm WatchSPCAlachua, Baker, Bradford, Citrus, Clay, Columbia and 13 more5 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.