Alert archive / Florida / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 103, NWS Miami, FL

July 12, 1997Miami-Dade County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Jul 12, 1997, 5:16 PM EDT for Miami-Dade County, Florida. It was in force for 59 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 12, 1997, 5:16 PM EDT (21:16 UTC)
Expired
Jul 12, 1997, 6:15 PM EDT
In force
59 min
Issued by
NWS Miami, FL
Area
Whole counties

County Miami-Dade County, FL

The radar

The Miami radar (KAMX), 9 km from the middle of the area, began a volume at 21:18 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 31 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 1997-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2069 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 1997-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 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
2069 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
829 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
55 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.

891 
WUUS1 KMIA 122117 RRA
SVRMIA
FLC025-122215-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
516 PM EDT SAT JUL 12 1997
 
THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  615 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION......
 
IN SOUTHEAST FLORIDA
 
   ...NORTHERN DADE COUNTY
 
AT 511 PM EDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM OVER NORTHERN DADE COUNTY NEAR OPA-LOCKA MOVING SOUTH AT 15
MPH. OTHER STRONG THUNDERSTORMS OVER NORTH DADE WEST OF MIAMI
INTERNATIONAL AIRPORT WILL MOVE EAST ACROSS NORTH DADE BETWEEN 515 AND
615 PM EDT. THESE STORMS WILL LIKELY PRODUCE LARGE HAIL AND WIND GUSTS
OVER 57 MPH IN ADDITION TO FREQUENT LIGHTNING STRIKES AND VERY HEAVY
DOWNPOURS.
 
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 12, 3:24 PM EDTSevere Thunderstorm WarningMFLMiami-Dade, Monroe66 min
Jul 12, 4:56 PM EDTSevere Thunderstorm WarningMFLMiami-Dade49 min
Jul 12, 6:44 PM EDTSevere Thunderstorm WarningMFLBroward46 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.