Alert archive / Florida / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 82, NWS Melbourne, FL

July 11, 1997Brevard County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 11, 1997, 2:20 PM EDT for Brevard County, Florida. It was in force for 50 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
Jul 11, 1997, 2:20 PM EDT (18:20 UTC)
Expired
Jul 11, 1997, 3:10 PM EDT
In force
50 min
Issued by
NWS Melbourne, FL
Area
Whole counties

County Brevard County, FL

The radar

The Melbourne radar (KMLB), 21 km from the middle of the area, began a volume at 18:20 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 12:00Z, 6.3 hours before the alert went out and 180 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 1997-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1358 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 1997-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -14 square meters per square second.1939Sfc1 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
1358 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
946 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
-14 m²/s²
0-3 km storm-relative helicity
-1 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.

000 
TTAA00 KMLB 111820 RRA
SVRMLB
FLC009-FLZ501-111910-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
220 PM EDT FRI JUL 11 1997

THE NATIONAL WEATHER SERVICE IN MELBOURNE FL HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 310 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN EAST CENTRAL FLORIDA

   ...BREVARD COUNTY
 
AT 219 PM...DOPPLER WEATHER RADAR INDCIATED A SEVERE THUNDERSTORM
BETWEEN SHARPES AND COCOA. THIS STORM WILL MOVE SLOWLY EAST AND WILL
AFFECT THE MERRITT ISLAND AREA THROUGH 3 PM. OTHER STRONG TO SEVERE
STORMS WILL LIKELY DEVELOP OVER BREVARD COUNTY FROM MIMS TO
MELBOURNE THROUGH 3 PM.

THE MAIN THREAT FROM THESE STORMS WILL BE HAILD GREATER THAN DIME
SIZE AND WATESPOUTS OVER THE INTRACOASTAL RIVERS. WATERSPOUTS CAN
MOVE ONSHORE AND PRODUCE DAMAGE. SEEK SHELTER NOW.
 
SPRATT

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 11, 1:44 PM EDTTornado WarningMLBOsceola31 min
Jul 11, 3:18 PM EDTSevere Thunderstorm WarningMLBBrevard47 min
Jul 11, 4:27 PM EDTSevere Thunderstorm WarningMLBIndian River48 min

Nearby

Severe Thunderstorm Warnings in Florida, 1997Every 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.