Alert archive / Florida / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 68, NWS Miami, FL

June 20, 1997Glades County, Hendry County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Jun 20, 1997, 8:45 PM EDT for Glades County, Hendry County, Florida. It was in force for 60 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 20, 1997, 8:45 PM EDT (00:45 UTC)
Expired: Jun 20, 1997, 9:45 PM EDT
In force: 60 min
Issued by: NWS Miami, FL
Area: Whole counties

Counties Glades County, FL, Hendry County, FL

The radar

The Miami radar (KAMX), 148 km from the middle of the area, began a volume at 00:49 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.

What was reported inside it

Time	Report	Where	Remark
Jun 20, 8:45 PM EDT	Tornado F0	Ortona, FL	reported by glades county e.m. near muce 10nm w of ortona.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Miami, FL (KMFL), launched 00:00Z, 0.8 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2853 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1010 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: -18 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.

566 
WUUS1 KMIA 210046 RRA
SVRMIA
FLC043-051-210145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
845 PM EDT FRI JUN 20 1997

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 945 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTH FLORIDA

   ...GLADES COUNTY
   ...WESTERN HENDRY COUNTY

 
AT 840 PM...MIAMI DOPPLER RADAR SHOWED A LINE OF SEVERE
THUNDERSTORMS EXTENDING FROM THE BRIGHTON INDIAN RESERVATION
OF GLADES COUNTY SOUTHWEST TO JUST WEST OF LABELLE OF HENDRY
COUNTY. THIS LINE WILL CONTINUE TO MOVE SOUTHEAST AT 10 MPH.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. 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.

Issued	Product	Office	Counties	Lasted
Jun 20, 9:38 PM EDT	Severe Thunderstorm Warning	MFL	Collier	67 min
Jun 21, 5:59 PM EDT	Severe Thunderstorm Warning	MFL	Broward	46 min
Jun 21, 6:42 PM EDT	Severe Thunderstorm Warning	MFL	Hendry	63 min
Jun 21, 6:51 PM EDT	Severe Thunderstorm Warning	MFL	Collier	69 min
Jun 21, 7:15 PM EDT	Severe Thunderstorm Warning	MFL	Collier	60 min

Nearby

Severe Thunderstorm Warnings in Florida, 1997 Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.