Alert archive / Florida / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 24, NWS Melbourne, FL

July 5, 1990Palm Beach County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 5, 1990, 5:28 PM EDT for Palm Beach County, Florida. It was in force for 62 min.

The area

The counties it named.

The facts

Issued
Jul 5, 1990, 5:28 PM EDT (21:28 UTC)
Expired
Jul 5, 1990, 6:30 PM EDT
In force
62 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 1990-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 292 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 1990-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -40 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
292 J/kg
Mixed-layer CIN
-112 J/kg
Mixed-layer LCL
1229 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-40 m²/s²
0-3 km storm-relative helicity
-26 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KPBI 052128
SVRPBI
FLC099-052230-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE WEST PALM BEACH FL
528 PM EDT THU JUL 5 1990
 
THE NATIONAL WEATHER SERVICE IN WEST PALM BEACH HAS ISSUED A
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
EFFECTIVE UNTIL  630 PM EDT
FOR THE FOLLOWING LOCATIONS...
 
IN SOUTHEAST FLORIDA
 
   ...WESTERN PALM BEACH COUNTY
   ...EASTERN SHORES OF LAKE OKEECHOBEE
 
AT 530 PM EDT...WEATHER SERVICE RADAR INDICATED A SEVERE THUNDER
STORM IN NORTHWEST PALM BEACH COUNTY JUST EAST OF PORT MAYACA. THIS
THUNDERSTORM IS MOVING TO THE SOUTH AT 15 MILES AN HOUR AND IS
CAPABLE OF PRODUCING STRONG GUSTY WINDS...DANGEROUS LIGHTNING..
HAIL AND HEAVY DOWNPOURS.
 
BOATERS ON LAKE OKEECHOBEE SHOULD BE PREPARED FOR ROUGH WATERS
...STRONG GUSTY WINDS...INTENSE CLOUD TO WATER LIGHTNING AS THIS
STORM MOVES ALONG THE EASTERN SHORE OF THE LAKE.
 
RESIDENTS OF WESTERN PALM BEACH COUNTY AND BOATERS ON LAKE
OKEECHOBEE SHOULD SEEK SAFE SHELTER IMMEDIATELTY.
 
 
 
THIS IS A DANGEROUS STORM.  IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND
DEADLY LIGHTNING.  PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS.
 
NNNN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 5, 6:50 PM EDTSevere Thunderstorm WarningMLBMartin55 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.