Alert archive / Florida / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 39, NWS Melbourne, FL

July 7, 1991Saint Lucie County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 7, 1991, 4:50 PM EDT for Saint Lucie County, Florida. It was in force for 55 min.

The area

The counties it named.

The facts

Issued
Jul 7, 1991, 4:50 PM EDT (20:50 UTC)
Expired
Jul 7, 1991, 5:45 PM EDT
In force
55 min
Issued by
NWS Melbourne, FL
Area
Whole counties

County Saint Lucie County, FL

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 8.8 hours before the alert went out and 121 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 1991-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 897 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 1991-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 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
897 J/kg
Mixed-layer CIN
-60 J/kg
Mixed-layer LCL
948 m above ground
0-6 km bulk shear
2 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
17 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 072050
SVRPBI
FLC111-072145-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE WEST PALM BEACH FL
450 PM EDT SUN JUL 7 1991
 
THE NATIONAL WEATHER SERVICE IN WEST PALM BEACH HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  545 PM EDT
FOR THE FOLLOWING LOCATIONS...
 
IN SOUTHEAST FLORIDA
 
   ...WESTERN ST.LUCIE COUNTY
 
AT 450 PM EDT NATIONAL WEATHER SERVICE RADAR INDICATED A STRONG
THUNDERSTORM OVER WESTERN ST. LUCIE COUNTY. THIS STORM WAS MOVING
SLOWLY TO THE NORTHWEST LESS THAN 10 MPH.
 
HAIL WAS INDICATED WITH THIS STORM ALONG WITH VERY HEAVY RAINFALL.
BECAUSE OF ITS SLOW MOVEMENT HEAVY CONTINUOUS RAIN COULD CAUSE
PONDING OF ROADWAYS AND LOW LYING AREAS.
 
 
 
 
 
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 BUIzLDING BUT STAY AWAY FROM WINDOWS.
 
NNNN

Nearby

Severe Thunderstorm Warnings in Florida, 1991Every severe thunderstorm warning in 1991

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.