Alert archive / Florida / Tornado Warnings in 1990

Tornado Warning 6, NWS Miami, FL

July 17, 1990Miami-Dade County, Florida

NWS Miami, FL issued this tornado warning at Jul 17, 1990, 1:08 PM EDT for Miami-Dade County, Florida. It was in force for 67 min.

The area

The counties it named.

The facts

Issued
Jul 17, 1990, 1:08 PM EDT (17:08 UTC)
Expired
Jul 17, 1990, 2:15 PM EDT
In force
67 min
Issued by
NWS Miami, FL
Area
Whole counties

County Miami-Dade 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 12:00Z, 5.1 hours before the alert went out and 169 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 12:00Z on 1990-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1505 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 12:00Z on 1990-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -10 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
1505 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
888 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
-10 m²/s²
0-3 km storm-relative helicity
11 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMIA 171707
TORMIA
FLC025-171815-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE MIAMI FL
108 PM EDT TUE JUL 17 1990
 
THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A
TORNADO AND SPECIAL MARINE WARNING EFFECTIVE UNTIL  215 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTHEAST FLORIDA
 
   ...DADE COUNTY
 
  AND FOR BOATERS ON THE COASTAL WATERS FROM
 
   ...HALLANDALE  TO  KEY LARGO
 
THE MIAMI BEACH PATROL REPORTED A WATERSPOUT ABOUT 1/4 MILE OFFSHORE
FROM 35TH STREET AT 1:00 PM EDT. THIS WATERSPOUT WHICH IS
MOVING WEST MAY MOVE ONSHORE BEFORE DISSIPATING.
 
CONDITIONS ARE RIGHT FOR ADDITIONAL WATERSPOUT DEVELOPMENT FOR THE
REMAINDER OF THE AFTERNOON.
 
BOATERS SHOULD SEEK SAFE HARBOR IMMEDIATELY AND REMAIN IN PORT
UNTIL THESE THUNDERSTORMS PASS BEYOND THE COASTAL WATERS.

Nearby

Tornado Warnings in Florida, 1990Every tornado warning in 1990Tornadoes in 1990

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.