Alert archive / Florida / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 99, NWS Miami, FL

July 11, 1997Broward County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Jul 11, 1997, 5:18 PM EDT for Broward County, Florida. It was in force for 42 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
Jul 11, 1997, 5:18 PM EDT (21:18 UTC)
Expired
Jul 11, 1997, 6:00 PM EDT
In force
42 min
Issued by
NWS Miami, FL
Area
Whole counties

County Broward County, FL

The radar

The Miami radar (KAMX), 60 km from the middle of the area, began a volume at 21:21 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.

The nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 9.3 hours before the alert went out and 40 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 1997-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2835 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 1997-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 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
2835 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
685 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
16 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 112120 RRA
SVRMIA
FLC011-112200-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
518 PM EDT FRI JUL 11 1997
 
THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  600 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION......
 
IN SOUTHEAST FLORIDA
 
   ...EASTERN BROWARD COUNTY
 
AT 515 PM EDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM OVER BROWARD COUNTY IN THE VICINITY OF WESTON AND THE
WESTERN PART OF SUNRISE. HAIL AS LARGE AS GOLFBALLS HAS BEEN REPORTED IN
THESE AREAS. THE STORM WILL MOVE NORTH OVER THE WESTERN PARTS OF
PLANTATION AND TAMARAC BETWEEN 520 PM AND 600 PM.
 
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
Jul 11, 5:40 PM EDTSevere Thunderstorm WarningMFLPalm Beach65 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.