Alert archive / Florida / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 10, NWS Miami, FL

May 20, 1986Broward County, Florida

NWS Miami, FL issued this severe thunderstorm warning at May 20, 1986, 9:48 PM EDT for Broward County, Florida. It was in force for 57 min.

The area

The counties it named.

The facts

Issued
May 20, 1986, 9:48 PM EDT (01:48 UTC)
Expired
May 20, 1986, 10:45 PM EDT
In force
57 min
Issued by
NWS Miami, FL
Area
Whole counties

County Broward 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

Key West, FL (KEYW), launched 00:00Z, 1.8 hours before the alert went out and 218 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, Key West, FL at 00:00Z on 1986-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 399 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, Key West, FL at 00:00Z on 1986-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 square meters per square second.19395878Sfc1 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
399 J/kg
Mixed-layer CIN
-278 J/kg
Mixed-layer LCL
1401 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
33 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMIA 210148
SVRMIA
FLC011-210245-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE MIAMI FL
948 PM EDT TUE MAY 20 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM AND 
SPECIAL MARINE WARNING EFFECTIVE UNTIL 1045 PM EDT FOR PEOPLE IN THE 
FOLLOWING COUNTY OF

SOUTHEAST FLORIDA...NORTHERN CENTRAL BROWARD
...THIS WARNING ALSO INCLUDES THE ADJACENT COASTAL WATERS FOR THE
COUNTY JUST MENTIONED

  AT 0930 PM EDT RADAR INDICATES AN AREA OF THUNDERSTORMS SOME
 SEVERE OVER NORTH CENTRAL BROWARD COUNTY. THIS AREA OF
 THUNDERSTORMS IS MOVING SOUTH AROUND 10 MPH AND MAY CONTAIN
 GUSTY DAMAGING WINDS..SMALL HAIL AND FREQUENT LIGHTNING STRIKES.

 THESE STORMS WILL ALSO LIKELY PRODUCE ROUGH SEAS AND POOR VISIBIL
 ITIES AS THEY MOVE OVER THE ADJACENT COASTAL WATERS.

IF THREATENING WEATHER APPROACHES YOU SHOULD GO TO A SAFE PLACE
IMMEDIATELY..AND YOU SHOULD ASK THE NEAREST LAW ENFORCEMENT AGENCY
TO RELAY YOUR SEVERE WEATHER REPORTS TO THE LOCAL NATIONAL WEATHER
SERVICE OFFICE.

The office that day

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

IssuedProductOfficeCountiesLasted
May 20, 10:42 PM EDTSevere Thunderstorm WarningMFLBroward, Miami-Dade63 min
May 21, 4:50 PM EDTSevere Thunderstorm WarningMFLBroward, Miami-Dade70 min
May 21, 6:06 PM EDTSevere Thunderstorm WarningMFLBroward, Miami-Dade54 min
May 21, 6:59 PM EDTSevere Thunderstorm WarningMFLBroward, Miami-Dade61 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.