Alert archive / Florida / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 109, NWS Melbourne, FL

November 2, 1997Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Nov 2, 1997, 2:58 AM EST for Osceola County, Florida. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Nov 2, 1997, 2:58 AM EST (07:58 UTC)
Expired: Nov 2, 1997, 3:40 AM EST
In force: 42 min
Issued by: NWS Melbourne, FL
Area: Whole counties

County Osceola County, FL

The radar

The Melbourne radar (KMLB), 49 km from the middle of the area, began a volume at 08:00 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.

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 00:00Z, 8.0 hours before the alert went out and 129 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1350 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 748 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 133 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 5.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMLB 020758 RRA
SVRMLB
FLC097-020840-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
258 AM EST SUN NOV 2 1997

THE NATIONAL WEATHER SERVICE IN MELBOURNE FL HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 340 AM EST
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN EAST CENTRAL FLORIDA

   ...OSCEOLA COUNTY
 
AT 255 AM...DOPPLER WEATHER RADAR INDICATED A SEVERE THUNDERSTORM
APPROACHING THE SOUTHERN PORTION OF LAKE KISSIMMEE. THIS STORM WILL
MOVE NORTHEAST AT 40 MPH ACROSS THE SOUTHERN PORTION OF THE LAKE
THEN CROSS HIGHWAY 60 AND THE FLORIDA TURNPIKE AND AFFECT
KENANSVILLE.

DAMAGING THUNDERSTORM WINDS AND FREQUENT CLOUD TO GROUND LIGHTNING
ARE` LIKELY WITH THIS STORM. MOVE TO AN INTERIOR ROOM IN YOUR HOME AND
REMAIN AWAY FROM WINDOWS AND ELECTRICAL APPLIANCES.

SPRATT

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Melbourne, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Nov 1, 7:41 PM EST, 7 hours 17 minutes earlier.

Area forecast discussion, Nov 1, 7:41 PM EST, 7 hours 17 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MELBOURNE FL
730 PM EST SAT NOV 1 1997

DIFFICULT 1ST PERIOD FORECAST CONSIDERING CURRENT ZONE PACKAGE.
LATEST MODEL GUIDANCE...RUC...MESO-ETA...AND RADAR TRENDS KEEP
SHORTWAVE DYNAMICS NORTH OF CWA OVERNIGHT. CONVECTION OVER PANHANDLE
HAS NOT SHOWN ANY SOUTHWARD DEVELOPMENT INTO THE GULF THIS EVENING
AND SEE LITTLE REASON FOR IT TO DO SO. DIFFLUENT FLOW ALOFT OVER
EASTERN GULF IS ALLOWING FEW STORMS TO FORM...BUT EVEN THESE ARE
WEAKENING AS THEY APPROACH THE COAST.

ALTHOUGH LATE AFTERNOON INSTABLITY WAS SUFFICIENT TO PRODUCE AN
ISOLATED THUNDERSTORM OVER THE N CENTRAL INTERIOR...LOW LEVEL FORCING
NOT APPARENT REMAINDER OF NIGHT. PLAN TO LOWER POPS TO 30 PERCENT
ACROSS THE NORTHERN COUNTIES AND 20 SOUTH...WITH THESE RAIN CHANCES
RESULTING FROM PROPAGATION/DEVELOPMENT OF SHOWERS/STORMS FROM EASTERN
GULF/W CENTRAL PENINSULA. CURRENT UNI-DIRECTIONAL BOUNDARY LAYER
WINDS OF 25-30 KNOTS PROGGED TO INCREASE FURTHER TONIGHT AS
SHORT-WAVE TRAVERSES FROM EASTERN GULF TO ATLANTIC COAST WELL NORTH
OF AREA. THEREFORE...HAVE ADDED LOW LEVEL WIND SHEAR TO AVIATION
PRODUCTS...AND BELIEVE THREAT OF STRONG WIND GUSTS WILL CONTINUE NEAR
ANY CONVECTIVE CELLS WHICH DEVELOP. WILL CHANGE WORDING FROM POSSIBLE
SEVERE STORMS TO POSSIBLE STRONG STORMS IN ZONES.

AFTER DISCUSSION WITH MIA...HAVE ALSO DECIDED TO LOWER POP FOR
SOUTHERN COUNTIES SLIGHTLY FOR SUNDAY...BUT STILL SHOWING UPWARD
TREND FROM 1ST TO 2ND PERIOD AS FRONT PROGRESSES THROUGH.

THANKS FOR THE WESTERN PENINSULA INSIGHT TBW.

SPRATT

In the hours before

Local storm report, Nov 2, 1:14 AM EST, 1 hour 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MELBOURNE FL
114 AM EST SUN NOV 02 1997

TIME(EST)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1245 AM    NEW SMYRNA BEACH          FL   TORNADO
11/02/97   VOLUSIA                        UNCONFIRMED TORNADO
                                          TOUCHDOWN BEACHSIDE IN NEW
                                          SMYRNA BEACH. POSSIBLE
                                          BUILDING COLLAPSE WITH
                                          INJURIES. EXTENT OF
                                          DAMAGE/INJURIES UNKNOWN.
                                          FROM VOLUSIA COUNTY EOC.

Local storm report, Nov 2, 1:27 AM EST, 1 hour 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MELBOURNE FL
114 AM EST SUN NOV 02 1997

TIME(EST)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1245 AM    NEW SMYRNA BEACH          FL   TORNADO
11/02/97   VOLUSIA                        UNCONFIRMED TORNADO
                                          TOUCHDOWN BEACHSIDE IN NEW
                                          SMYRNA BEACH. POSSIBLE
                                          BUILDING COLLAPSE WITH
                                          INJURIES. EXTENT OF
                                          DAMAGE/INJURIES UNKNOWN.
                                          FROM VOLUSIA COUNTY EOC.

The office that day

Everything else NWS Melbourne, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 2, 12:38 AM EST	Severe Thunderstorm Warning	MLB	Volusia	32 min
Nov 2, 5:12 AM EST	Severe Thunderstorm Warning	MLB	Indian River	48 min
Nov 2, 6:08 AM EST	Severe Thunderstorm Warning	MLB	Indian River	42 min
Nov 2, 7:09 AM EST	Severe Thunderstorm Warning	MLB	Brevard	61 min
Nov 2, 8:04 AM EST	Severe Thunderstorm Warning	MLB	Okeechobee	56 min
Nov 2, 8:17 AM EST	Tornado Warning	MLB	Okeechobee	48 min

Nearby

Severe Thunderstorm Warnings in Florida, 1997 Every severe thunderstorm warning 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.