Alert archive / Florida / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 12, NWS Miami, FL

August 10, 1990Miami-Dade County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Aug 10, 1990, 12:57 PM EDT for Miami-Dade County, Florida. It was in force for 63 min.

The area

The counties it named.

The facts

Issued
Aug 10, 1990, 12:57 PM EDT (16:57 UTC)
Expired
Aug 10, 1990, 2:00 PM EDT
In force
63 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, 5.0 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 1990-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2527 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 1990-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
2527 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
753 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
0 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 101659
SVRMIA
FLC025-101800-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
1257 PM EDT FRI AUG 10 1990
 
THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  200 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTHEAST FLORIDA
 
   ...DADE COUNTY
 
AND THE ADJACENT COASTAL WATERS ALONG THE SOUTHEAST FLORIDA COAST
AND THE ADJACENT COASTAL WATERS
 
A SEVERE THUNDERSTORM WAS LOCATED IN THE CUTLER RIDGE/PERRINE/
RICHMOND HEIGHTS/WEST KENDALL AREA OF DADE COUNTY AT 1255 PM EDT.
THIS THUNDERSTORM IS MOVING SLOWLY NORTH AND MAY CAUSE STRONG
DAMAGING WINDS ALONG WITH LARGE HAIL.
 
MARBLE SIZE HA*IL ALONG WITH WINDS OF 40 TO 50 MPH HAVE ALREADY
BEEN REPORTED WITH THIS STORM.

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, Aug 10, 12:46 PM EDT, 11 minutes before
FLZ015>023-101735-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE MIAMI FL
1225 PM EDT FRI AUG 10 1990

SCATTERED THUNDERSTORMS WITH VERY HEAVY RAINFALL WERE RAPIDLY DEVELOPING
OVER SOUTH DADE COUNTY.  AT 1225 PM EDT HEAVIEST RAINFALL WAS DETECTED
SOUTH OF MIAMI BETWEEN HOMESTEAD AND THE COMMUNITY OF CULTER RIDGE.

THESE THUNDERSTORMS HAVE THE POTENIAL TO PRODUCE PERIODS OF VERY HEAVY RAINFALL
ALONG WITH GUSTY SURFACE WINDS AND DANGEROUS LIGHTNING STRIKES. MOVEMENT
WAS NORTHEAST AROUND 5 MILES AN HOUR.

SHOULD THREATENING WEATHER DEVELOP... SEEK SHELTER IMMEDIATELY.

ELSEWHERE... SCATTERED SHOWERS AND THUNDERSTORMS WERE DEVELOPING ACROSS THE
LOWER PENINSULA SOUTH OF A LINE FROM ST LUCIE TO CHARLOTTE COUNTY. SEVERAL WERE
ASSOCIATED WITH VERY HEAVY RAINFALL.  OVER THE ATLANTIC... THERE WERE SCATTERED
SHOWERS AND THUNDERSTORMS FROM NORTH OF GRAND BAHAMA ISLAND AND FROM SOUTH OF
THE BIMINIS TO THE CAY SAL BANK. THERE WERE ISOLATED SHOWERS AND THUNDERSTORMS
ACROSS THE LOWER KEYS AND THE GULF OF MEXICO SOUTHWEST OF CAPE ROMANO.

HIGHEST PRECIPITATION WAS 41 THOUSAND FEET OVER THE LOWER SOUTHWEST
PENINSULA.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 2:13 PM EDTSevere Thunderstorm WarningMFLBroward47 min

Nearby

Severe Thunderstorm Warnings in Florida, 1990Every severe thunderstorm warning 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.