Alert archive / Florida / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 74, NWS Miami, FL

June 21, 1997Collier County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Jun 21, 1997, 8:18 PM EDT for Collier County, Florida. It was in force for 27 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 21, 1997, 8:18 PM EDT (00:18 UTC)
Expired
Jun 21, 1997, 8:45 PM EDT
In force
27 min
Issued by
NWS Miami, FL
Area
Whole counties

County Collier County, FL

The radar

The Miami radar (KAMX), 111 km from the middle of the area, began a volume at 00:21 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

TimeReportWhereRemark
Jun 21, 8:30 PM EDTTornado F0Naples, FLbrief touchdown on ohio drive. trees down no damage to buildings.

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, 0.3 hours before the alert went out and 113 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 00:00Z on 1997-06-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2108 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 00:00Z on 1997-06-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -21 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
2108 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
1083 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-21 m²/s²
0-3 km storm-relative helicity
41 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.

604 
WUUS1 KMIA 220019 RRA
SVRMIA
FLC021-220045-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
818 PM EDT SAT JUN 21 1997
 
THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  845 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION......
 
IN SOUTHWEST FLORIDA
 
   ...WESTERN COLLIER COUNTY
 
AT 815 PM...WEATHER RADAR SHOWED SEVERE THUNDERSTORMS FROM
VANDERBILT BEACH THROUGH NAPLES TO BELLE MEADE MOVING WEST
AT 5 TO 10 MPH. SMALL HAIL AND VERY HEAVY RAIN HAS BEEN REPORTED.
AN UNCONFIRMED REPORT OF A FUNNEL CLOUD WAS RECEIVED FROM EAST
NAPLES.
 
IF THREATENING WEATHER IS SIGHTED...TAKE SHELTER...THEN REPORT THE
SEVERE WEATHER TO YOUR LOCAL LAW ENFORCEMENT AGENCY.
 
 
 
&

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 22, 9:46 AM EDTTornado WarningMFLMiami-Dade59 min
Jun 22, 1:17 PM EDTSevere Thunderstorm WarningMFLGlades, Hendry58 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.