Alert archive / Florida / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 63, NWS Miami, FL

June 20, 1997Monroe County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Jun 20, 1997, 5:47 PM EDT for Monroe County, Florida. It was in force for 58 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 20, 1997, 5:47 PM EDT (21:47 UTC)
Expired
Jun 20, 1997, 6:45 PM EDT
In force
58 min
Issued by
NWS Miami, FL
Area
Whole counties

County Monroe County, FL

The radar

The Miami radar (KAMX), 51 km from the middle of the area, began a volume at 21:48 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, 9.8 hours before the alert went out and 69 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 1997-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 462 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 1997-06-20The 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
462 J/kg
Mixed-layer CIN
-183 J/kg
Mixed-layer LCL
1411 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-21 m²/s²
0-3 km storm-relative helicity
-97 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 202149 RRA
SVRMIA
FLC087-202245-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
547 PM EDT FRI JUN 20 1997
 
THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  645 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION......
 
IN SOUTH FLORIDA
 
   ...THE MIDDLE AND LOWER FLORIDA KEYS OF MONROE COUNTY
      AND THE ADJACENT COASTAL WATERS
 
 
AT 545 PM NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LARGE
CLUSTER OF POSSIBLE SEVERE THUNDERSTORMS OVER FLORIDA BAY 10 NM
NORTH OF MARATHON TO 15 NM NORTHEAST OF BIG PINE KEY.  MOVEMENT
WAS SOUTHWEST AT 15 KT.
 
DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...VERYZ 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 19, 9:37 PM EDTSevere Thunderstorm WarningMFLPalm Beach88 min
Jun 20, 12:11 AM EDTSevere Thunderstorm WarningMFLBroward, Miami-Dade64 min
Jun 20, 5:04 PM EDTSevere Thunderstorm WarningMFLMiami-Dade56 min
Jun 20, 6:51 PM EDTSevere Thunderstorm WarningMFLMonroe59 min
Jun 20, 7:53 PM EDTSevere Thunderstorm WarningMFLGlades62 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.