Alert archive / Florida / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 29, NWS Melbourne, FL

July 6, 1990Martin County, Okeechobee County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 6, 1990, 5:15 PM EDT for Martin County, Okeechobee County, Florida. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
Jul 6, 1990, 5:15 PM EDT (21:15 UTC)
Expired
Jul 6, 1990, 6:15 PM EDT
In force
60 min
Issued by
NWS Melbourne, FL
Area
Whole counties

Counties Martin County, FL, Okeechobee 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, 9.3 hours before the alert went out and 138 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 1990-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1744 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 1990-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 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
1744 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
896 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
40 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KPBI 062111
SVRPBI
FLC093-085-062215-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE WEST PALM BEACH FL
515 PM EDT FRI JUL 6 1990
 
THE NATIONAL WEATHER SERVICE IN WEST PALM BEACH HAS ISSUED A
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
EFFECTIVE UNTIL  615 PM EDT
FOR THE FOLLOWING LOCATIONS...
 
IN SOUTH FLORIDA
 
   ...SOUTHEASTERN OKEECHOBEE COUNTY
   ...NORTHERN MARTIN COUNTY
 
  AND FOR BOATERS ON THE WATERS...
 
  ...OF LAKE OKEECHOBEE
 
AT 510 PM EDT...WEATHER SERVICE RADAR INDICATED A SEVERE THUNDER
STORM ALONG ATHE NORTHEAST SHORE OF LAKE OKEECHOBBE SOUTHEAST OF
OKEECHOBEE CITY.  THIS STORM IS MOVING SLOWLY EAST ABOUT 10 MILES
AN HOUR. RESIDENTS OF SOUTHEAST OKEECHOBEE AND NORTHERN MARTIN
COUNTIES SHOULD BE ALERT FOR THIS STORM DURING THE NEXT HOUR.
 
BOATERS ON THE WATERS OF THE NORTHEAST SHORE OF LAKE OKEECHOBEE
SHOULD SEEK SAFE HARBOR IMMEDIATELY AS THIS STORM WILL LIKELY
PRODUCE INTENSE CLOUD TO WATER LIGHTNING...GUSTY WINDS...HAIL
AND ROUGH WATERS.
 
 
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.  PEOPLXE 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 6, 10:43 AM EDTSevere Thunderstorm WarningMLBPalm Beach62 min
Jul 6, 3:45 PM EDTSevere Thunderstorm WarningMLBPalm Beach
Jul 6, 4:14 PM EDTSevere Thunderstorm WarningMLBPalm Beach61 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.