Alert archive / Florida / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 20, NWS Melbourne, FL

July 25, 1986Okeechobee County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 25, 1986, 6:10 PM EDT for Okeechobee County, Florida. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
Jul 25, 1986, 6:10 PM EDT (22:10 UTC)
Expired
Jul 25, 1986, 7:10 PM EDT
In force
60 min
Issued by
NWS Melbourne, FL
Area
Whole counties

County Okeechobee 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 12:00Z, 10.2 hours before the alert went out and 153 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 1986-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1986-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
NaN m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
20 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 KMIA 252212
SVRPBI
FLC093-252310-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE WEST PALM BEACH FL.
610 PM EDT FRI JUL 25 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 710 PM EDT FOR PEOPLE IN THE FOLLOWING COUNTIES:

IN SOUTH FLORIDA.. OKEECHOBEE

AT 608 PM EDT RADAR INDICATED A SEVERE THUNDERSTORM 3 MILES NORTHWEST
OF OKEECHOBEE CITY. THE SEVERE THUNDERSTORM WAS MOVING NORTHEAST AT
10 MPH.

IF THREATENING WEATHER APPROACHES YOU SHOULD SEEK SAFE SHELTER
IMMEDIATELY.

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.