Alert archive / Florida / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 25, NWS Melbourne, FL

July 5, 1990Martin County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 5, 1990, 6:50 PM EDT for Martin County, Florida. It was in force for 55 min.

The area

The counties it named.

The facts

Issued
Jul 5, 1990, 6:50 PM EDT (22:50 UTC)
Expired
Jul 5, 1990, 7:45 PM EDT
In force
55 min
Issued by
NWS Melbourne, FL
Area
Whole counties

County Martin 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, 10.8 hours before the alert went out and 155 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 052246
SVRPBI
FLC085-052345-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE WEST PALM BEACH FL
650 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  750 PM EDT
FOR THE FOLLOWING LOCATIONS...
 
IN SOUTHEAST FLORIDA
 
   ...SOUTHWESTERN MARTIN COUNTY
   ...NORTHEAST SHORE OF LAKE OKEECHOBEE
 
AT 645 PM EDT WEATHER SERVICE RADAR INDICATED A SEVERE THUNDER
STORM WEST OF INDIAN TOWN. THIS STORM IS MOVING TO THE SOUTH
ABOUT 15 MILES AN HOUR.
 
RESIDENTS OF SOUTHWEST MARTIN COUNTY AND BOATERS ON THE NORTH
EAST SHORE OF LAKE OKEECHOBEE SHOULD BE ALERT FOR THIS STORM
DURING THE NEXT HOUR.
 
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.
 
BOATERS ON THE NORTHEAST SHORE OF LAKE OKEECHOBEE SHOULD SEEK SAFE
HARBOR. THIS THUNDERSTORM WILL LIKELY PRODUCE ROUGH WATERS AND
INTENSE CLOUD TO WATER LIGHTNING.
 
NNNN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 5, 5:28 PM EDTSevere Thunderstorm WarningMLBPalm Beach62 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.