Alert archive / Florida / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 6, NWS Melbourne, FL

June 4, 1990Palm Beach County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jun 4, 1990, 5:30 PM EDT for Palm Beach County, Florida. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
Jun 4, 1990, 5:30 PM EDT (21:30 UTC)
Expired
Jun 4, 1990, 6:30 PM EDT
In force
60 min
Issued by
NWS Melbourne, FL
Area
Whole counties

County 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, 9.5 hours before the alert went out and 203 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 1990-06-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 928 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 1990-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 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
928 J/kg
Mixed-layer CIN
-53 J/kg
Mixed-layer LCL
873 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
-18 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 KPBI 042129
SVRPBI
FLC099-042230-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE WEST PALM BEACH FL
530 PM EDT MON JUN 4 1990
 
THE NATIONAL WEATHER SERVICE IN WEST PALM BEACH HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  630 PM EDT
FOR THE FOLLOWING LOCATIONS...
 
IN SOUTHEAST FLORIDA
 
   ...SOUTHEASTERN PALM BEACH COUNTY
 
AND THE ADJACANT WATERS OF THE SOUTHEAST FLORIDA COAST
 
 
AT 530 PM EDT WEATHER SERVICE RADAR WAS INDICATING A SEVERE
THUNDERSTORM JUST SOUTH OF BOCA RATON ON THE BROWARD - PALM BEACH
COUNTY LINE MOVING TO THE NORTHEAST AT 10 MPH.
 
THIS THUNDERSTORM IS EXPECTD TO PRODUCE WIND GUSTS OF 55 MILES AN
HOUR...3/4 QUARTER INCH HAIL AND OR DANGEROUS LIGHTNING STRIKES.
ALSO...HEAVY DOWNPOURS MAY CAUSE STREET FLOODING.
 
 
NNNN

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, Jun 4, 4:36 PM EDT, 54 minutes before
FLZ012-042200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DAYTONA BEACH FL
435 PM EDT MON JUN 4 1990

THIS IS A SPECIAL WEATHER STATEMENT FOR FLAGLER AND VOLUSIA COUNTIES AND
THEIR ADJACENT COASTAL WATERS...

AT 435 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED VERY STRONG THUNDERSTORMS
CAPABLE OF PRODUCING STRONG GUSTY WINDS...FREQUENT DANGEROUS LIGHTNING STRIKES
...POSSIBLY SMALL HAIL...AND VERY HEAVY RAINFALL AMOUNTS...EXTENDING FROM THE
COASTAL WATERS OF FLAGLER COUNTY INTO THE THE NORTHWEST CORNER OF VOLUSIA
COUNTY NEAR LAKE GEORGE.

THESE THUNDERSTORM WILL MOVE EAST AT AROUND 10 MPH.

PERSONS IN THE AFFECTED AREA SHOULD BE PREPARED FOR THE APPROACH OF THESE
THUNDERSTORMS AND AND BE PREPARED TO SEEK SAFE SHELTER IMMEDIATELY. BOATERS
OVER THE ATLANTIC AND INTRACOASTAL WATERWAYS ALONG FLAGLER AND VOLUSIA
COUNTIES EAST COAST...SHOULD EXPECT LOCALLY ROUGH SEAS AND STRONG GUSTY WINDS
TO ACCOMPANY THESE THUNDERSTORMS FOR THE NEXT HOUR OR SO.
Special weather statement, Jun 4, 4:47 PM EDT, 43 minutes before
FLZ017-011-016-012-042245-

SPECIAL EAST CENTRAL FLORIDA WEATHER UPDATE
NATIONAL WEATHER SERVICE MELBOURNE FL
445 PM EDT MON JUN 4 1990

AT 445 PM STRONG THUNDERSTORMS WERE ALONG THE COAST FROM NORTH OF
DAYTONA INTO FLAGLER COUNTY. THESE THUNDERSTORMS WILL LIKELY PRODUCE
STRONG GUSTY WINDS FREQUENT DANGEROUS LIGHTNING...HEAVY
DOWNPOURS AND POSSIBLE SMALL HAIL.

OTHER THUNDERSTORMS WERE ACTIVE ALONG THE COAST FROM CAPE CANAVERAL TO
MELBOURNE TO NEAR VERO BEACH. THUNDERSTORMS WERE ALSO INLAND FROM NEAR
KISSIMMEE WEST AND SOUTH INTO POLK COUNTY.

ALL THUNDERSTORMS WERE MOVING EAST AT 15 MPH.

DURING THE NEXT 2 HOURS THUNDERSTORMS WILL CONTINUE TO INCREASE OVER
MUCH OF CENTRAL FLORIDA ESPECIALLY ALONG THE EAST COAST AND WILL
LIKELY DRIFT OVER THE ADJACENT COASTAL WATERS.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 4, 4:37 PM EDTTornado WarningMLBPalm Beach53 min
Jun 4, 6:12 PM EDTSevere Thunderstorm WarningMLBIndian River33 min
Jun 4, 6:34 PM EDTSevere Thunderstorm WarningMLBSaint Lucie56 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.