Alert archive / Florida / Tornado Warnings in 1999

Tornado Warning 6, NWS Miami, FL

September 21, 1999Broward County, Miami-Dade County, Florida

NWS Miami, FL issued this tornado warning at Sep 21, 1999, 4:50 AM EDT for Broward County, Miami-Dade County, Florida. It was in force for 40 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
Sep 21, 1999, 4:50 AM EDT (08:50 UTC)
Expired
Sep 21, 1999, 5:30 AM EDT
In force
40 min
Issued by
NWS Miami, FL
Area
Whole counties

Counties Broward County, FL, Miami-Dade County, FL

The nearest sounding before it

Miami, FL (KMFL), launched 00:00Z, 8.8 hours before the alert went out and 20 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.

000 
TTAA00 KMFL 210855 RRA
TORMIA
FLC011-025-210930-

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

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* TORNADO WARNING FOR...

  EASTERN BROWARD COUNTY IN FLORIDA
  NORTHEASTERN MIAMI-DADE COUNTY IN FLORIDA

* UNTIL 530 AM EDT

* AT 450 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 2   
POSSIBLE TORNADOES JUST NORTHEAST OF SWEETWATER AND ANOTHER JUST NORTHWEST
OF HIALEAH MOVING NORTHEAST AT 20 MPH. THESE POSSIBLE TORNADOES WILL MOVE
INTO PEMBROKE PINES AND WESTON BY 515 AM.

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF
YOUR HOME OR BUSINESS.

LAT...LON 2587 8059 2576h 8035 2628 8013 2634 8039

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Local storm report, Sep 20, 10:59 PM EDT, 5 hours 51 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE MIAMI, FL
1059 PM EDT MON SEP 20 1999

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0840 PM    NAPLES MUNI ARPT          FL   FLOODING
09/20/99   COLLIER                        MORE THAN EIGHT INCHES OF
                                          RAIN WITH SEVERAL ROAD
                                          CLOSURES.

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, 5:27 AM EDTTornado WarningMFLBroward43 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.