Alert archive / Florida / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 71, NWS Miami, FL

June 21, 1997Hendry County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Jun 21, 1997, 6:42 PM EDT for Hendry County, Florida. It was in force for 63 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
Jun 21, 1997, 6:42 PM EDT (22:42 UTC)
Expired
Jun 21, 1997, 7:45 PM EDT
In force
63 min
Issued by
NWS Miami, FL
Area
Whole counties

County Hendry County, FL

The radar

The Miami radar (KAMX), 129 km from the middle of the area, began a volume at 22:45 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 10.7 hours before the alert went out and 120 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, Miami, FL at 12:00Z on 1997-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2555 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, Miami, FL at 12:00Z on 1997-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 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
2555 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
695 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
-11 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.

008 
WUUS1 KMIA 212244 RRA
SVRMIA
FLC051-212345-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
642 PM EDT SAT JUN 21 1997
 
THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  745 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION......
 
IN SOUTH FLORIDA
 
   ...SOUTHERN HENDRY COUNTY
 
AT 640 PM...MIAMI DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
JUST NORTHEAST OF THE HENDRY CORRECTIONAL INSTITUTE. MOVEMENT
WILL BE WEST AT 10 MPH.
 
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
Jun 20, 8:45 PM EDTSevere Thunderstorm WarningMFLGlades, Hendry60 min
Jun 20, 9:38 PM EDTSevere Thunderstorm WarningMFLCollier67 min
Jun 21, 5:59 PM EDTSevere Thunderstorm WarningMFLBroward46 min
Jun 21, 6:51 PM EDTSevere Thunderstorm WarningMFLCollier69 min
Jun 21, 7:15 PM EDTSevere Thunderstorm WarningMFLCollier60 min

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; radar from the NEXRAD Level II archive.