Alert archive / Florida / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 83, NWS Miami, FL

July 4, 1997Monroe County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Jul 4, 1997, 1:55 AM EDT for Monroe County, Florida. It was in force for 65 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 4, 1997, 1:55 AM EDT (05:55 UTC)
Expired
Jul 4, 1997, 3:00 AM EDT
In force
65 min
Issued by
NWS Miami, FL
Area
Whole counties

County Monroe County, FL

The nearest sounding before it

Key West, FL (KNQX), launched 00:00Z, 5.9 hours before the alert went out and 137 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, Key West, FL at 00:00Z on 1997-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3176 joules per kilogram.LCLEL10008507005003002001001 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, Key West, FL at 00:00Z on 1997-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 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
3176 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
779 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
-10 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 KMIA 040553 RRA
SVRMIA
FLC087-040700-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
155 AM EDT FRI JUL 4 1997
 
THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  300 AM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION......
 
IN SOUTH FLORIDA
 
   ...LOWER KEYS OF MONROE COUNTY
 
AND THE ADJACENT COASTAL WATERS
 
 
A SEVERE THUNDERSTORM WAS OVER SUGARLOAF KEY IN THE LOWER KEYS AT 148
AM. THIS STORM WAS MOVING SLOWLY EAST AND WILL AFFECT CUDJOE KEY AND
POSSIBILITY BIG PINE KEY BETWEEN NOW AND 215 AM.
 
 
DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN A SEVERE THUNDERSTORM. SEEK
SHELTER IN A STRONG BUILDING. STAY AWAY FROM WINDOWS. DO NOT USE
TELEPHONES OR ELECTRICAL APPLIANCES.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 4, 2:04 PM EDTSevere Thunderstorm WarningMFLHendry61 min
Jul 4, 2:34 PM EDTSevere Thunderstorm WarningMFLCollier56 min
Jul 4, 2:57 PM EDTSevere Thunderstorm WarningMFLGlades, Hendry63 min
Jul 4, 3:30 PM EDTSevere Thunderstorm WarningMFLCollier2 hr

Nearby

Severe Thunderstorm Warnings in Florida, 1997Every severe thunderstorm warning in 1997

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.