Alert archive / Florida / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 135, NWS Miami, FL

August 15, 1997Collier County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Aug 15, 1997, 7:23 PM EDT for Collier County, Florida. It was in force for 52 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
Aug 15, 1997, 7:23 PM EDT (23:23 UTC)
Expired
Aug 15, 1997, 8:15 PM EDT
In force
52 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 23:27 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, 11.4 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 12:00Z on 1997-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 578 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 1997-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -25 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
578 J/kg
Mixed-layer CIN
-79 J/kg
Mixed-layer LCL
1335 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-25 m²/s²
0-3 km storm-relative helicity
-6 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 152323 RRA
SVRMIA
FLC021-160015-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
723 PM EDT FRI AUG 15 1997
 
THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  815 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION......
 
IN SOUTHWEST FLORIDA
 
   ...EASTERN COLLIER COUNTY
 
AND THE ADJACENT COASTAL WATERS
 
AT 720 PM MIAMI DOPPLER RADAR CONTINUED TO INDICATE A SEVERE
THUNDERSTORM OVER EASTERN COLLIER COUNTY NEAR ALLIGATOR ALLEY...
5 TO 10 MILES WEST OF THE BROWARD COUNTY LINE. THE STORM IS DRIFING
TO THE NORTH AT LESS THAN 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.
 
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
Aug 15, 4:46 PM EDTSevere Thunderstorm WarningMFLGlades44 min
Aug 15, 5:04 PM EDTSevere Thunderstorm WarningMFLGlades56 min
Aug 15, 5:53 PM EDTSevere Thunderstorm WarningMFLHendry52 min
Aug 15, 6:29 PM EDTSevere Thunderstorm WarningMFLCollier46 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.