Alert archive / Florida / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 21, NWS Melbourne, FL

July 31, 1986Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 31, 1986, 8:30 PM EDT for Osceola County, Florida. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
Jul 31, 1986, 8:30 PM EDT (00:30 UTC)
Expired
Jul 31, 1986, 9:30 PM EDT
In force
60 min
Issued by
NWS Melbourne, FL
Area
Whole counties

County Osceola County, FL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 00:00Z, 0.5 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-pSkew-T log-p diagram, Tampa Bay, FL at 00:00Z on 1986-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3098 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 00:00Z on 1986-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 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
3098 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
762 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
90 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 KMCO 010041
SVRMCO
FLC097-010030-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ORLANDO FL
830 PM EDT THU JUL 31 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL930 PM EDT FOR RESIDENTS IN THE FOLLOWING
COUNTIES IN CENTRAL FLORIDA..

OSCEOLA

AT 825 PM VERY STRONG THUNDERSTORMS WERE INDICATED BY RADAR
IN THE NORTHERN PORTION OF OSCEOLA COUNTY MOVING TO THE SOUTH
EAST AT 15 MXPH. RESIDENTS MAY EXPECT STRONG GUSTY WIND..HEAVY
RAIN..FREQUENT LIGHTNING AND POSSIBLE HAIL.

THESE ARE DANGEROUS STORMS AND RESIDENTS OF THE AFFECTED AREAS
SHOULD BE PREPARED TO SEEK SAFE SHELTER.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 8:42 PM EDTTornado WarningMLBMarion33 min

Nearby

Severe Thunderstorm Warnings in Florida, 1986Every severe thunderstorm warning in 1986

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.