Alert archive / Florida / Tornado Warnings in 1999

Tornado Warning 7, NWS Miami, FL

September 21, 1999Broward County, Florida

NWS Miami, FL issued this tornado warning at Sep 21, 1999, 5:27 AM EDT for Broward County, Florida. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Sep 21, 1999, 5:27 AM EDT (09:27 UTC)
Expired
Sep 21, 1999, 6:10 AM EDT
In force
43 min
Issued by
NWS Miami, FL
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Broward County, FL

The nearest sounding before it

Miami, FL (KMFL), launched 00:00Z, 9.5 hours before the alert went out and 28 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 1999-09-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 841 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 1999-09-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 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
841 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
899 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
104 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

807 
WFUS1 KMIA 210930 RRA
TORMIA
FLC011-211030-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MIAMI FL
527 AM EDT TUE SEP 21 1999

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* TORNADO WARNING FOR...

  SOUTHEASTERN BROWARD COUNTY IN FLORIDA

* UNTIL 610 AM EDT

* AT 527 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A   
TORNADO 4 MILES SOUTHWEST OF NORTH PERRY AIRPORT MOVING NORTHEAST AT 
20 MPH. THIS TRACK WILL TAKE IT TO FORT LAUDERDALE BY 600 AM.

SEEK A STURDY SHELTER IMMEDIATELY

LAT...LON 2598 8036 2597 8035 2598 8019 2622 8009
          2629 8019

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 20, 10:00 PM EDTFlash Flood WarningMFLCollier5 hr
Sep 21, 3:00 AM EDTFlash Flood WarningMFLCollier9 hr
Sep 21, 4:50 AM EDTTornado WarningMFLBroward, Miami-Dade40 min
Sep 21, 5:59 AM EDTTornado WarningMFLMiami-Dade31 min

Nearby

Tornado Warnings in Florida, 1999Every tornado warning in 1999Tornadoes in 1999

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.