Alert archive / Florida / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 16, NWS Melbourne, FL

May 21, 1986Martin County, Palm Beach County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 21, 1986, 1:45 PM EDT for Martin County, Palm Beach County, Florida. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
May 21, 1986, 1:45 PM EDT (17:45 UTC)
Expired
May 21, 1986, 3:45 PM EDT
In force
2 hr
Issued by
NWS Melbourne, FL
Area
Whole counties

Counties Martin County, FL, Palm Beach 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 5.8 hours before the alert went out and 179 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, Cape Canaveral, FL at 12:00Z on 1986-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1096 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, Cape Canaveral, FL at 12:00Z on 1986-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 152 square meters per square second.193958Sfc1 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
1096 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
661 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
152 m²/s²
0-3 km storm-relative helicity
204 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KPBI 211745
SVRPBI
FLC099-085-211945-

BULLETIN - IMMEDIATE BROADCAST REQQUESTED
SEVERE THUNDERSTORM AND SEPECIAL MARINE WARNNING
NATIONAL WEATHER SERVICE WEST PALM BEACH FL
145 PM EDT WED MAY 21 1986 EXPIRES 345 PM EDT   

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL  345PM EDT FOR PERSONS IN THE FOLLOWING COUNTIES IN

SOUTH FLORIDA...PALM-BEACH MARTIN   

AT 145 PM EDT RADAR INICATED SEVERE THUNDERSTORMS OVER SOUTH LAKE
OKEECHOBEE MOVING TO THE EAST NORTHEAST AT 20 MPH.

THESE THUNDERSORMS WILL MOVE THROUGH PALM BEACH AND MARTIN COUNTIES
DURING THE NEXT FEW HOURS.

PERSONS IN THE ABOVE COUNTIES AND MARINE INTERESTS ON LAKE OKEECHOBEE
SHOULD SEEK SAFE SHELTER IF CO;NDITIONS WARRANT.

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.

In the hours before

Special weather statement, May 21, 1:35 PM EDT, 10 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DAYTONA BEACH FL
130 PM EDT WED MAY 21 1986

THE SEVERE THUNDERSTORM WATCH NUMBER 204 CONTINUES IN EFFECT FOR MUCH
OF CENTRAL AND SOUTH FLORIDA AND THE ADJACENT COASTAL WATERS.

THIS WATCH INCLUDES THE FOLLOWING COUNTIES UNDER THE RESPONSIBILITY OF
THE DAYTONA BEACH NATIONAL WEATHER SERVICE OFFICE..VOLUSIA..BREVARD..
INDIAN RIVER..FLAGLER AND MARION.

UNSTABLE WEATHER CONDITIONS IN ASSOCIATION WITH A FRONTAL SYSTEM MOVING
THROUGH NORTH FLORIDA MAKE CONDITIONS FAVORABLE FOR INTENSE THUNDERSTORM
DEVELOPEMENT THIS AFTERNOON.

AT 130PM RADAR INDICATES THE GREATEST AREA OF CONCERN FOR THE STRONGEST
THUNDERSTORMS EXTENDS FROM VERO BEACH ACROSS THE STATE TO NORTH OF FORT
MYERS..COVERING ABOUT A 50 MILE WIDE AREA. THE MOST INTENSE STORMS WERE
NEAR LAKE PLACID AND SEBRING AND ALONG THE KISSIMMEE RIVER..MOVING NORTHEAST
AT 25 MPH.                                                               0    [

OTHER THUNDERSTORMS WERE SCATTERED OVER THE COASTAL WATERS BETWEEN
VERO BEACH AND CAPE CANAVERAL.

PERSONS IN THE WATCH AREA SHOULD BE ON THE ALERT FOR SEVERE THUNDERSTORM
DEVELOPEMENT THIS AFTERNOON.

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.