Alert archive / Florida / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 45, NWS Miami, FL

May 12, 1999Broward County, Florida

NWS Miami, FL issued this severe thunderstorm warning at May 12, 1999, 1:48 PM EDT for Broward County, Florida. It was in force for 27 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
May 12, 1999, 1:48 PM EDT (17:48 UTC)
Expired
May 12, 1999, 2:15 PM EDT
In force
27 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 12:00Z, 5.8 hours before the alert went out and 37 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 1999-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1036 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 1999-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -8 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
1036 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
811 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
-8 m²/s²
0-3 km storm-relative helicity
31 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMFL 121749 RRA
SVRMIA
FLC011-121815-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
148 PM EDT WED MAY 12 1999

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN BROWARD COUNTY IN FLORIDA

* UNTIL 215 PM EDT

* AT 148 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER BROADVIEW PARK...OR ABOUT 3 MILES
  SOUTHEAST OF PLANTATION...MOVING NORTH AT 15 MPH.

* SOME LOCATIONS WHICH MAY BE AFFECTED BY THIS STORM INCLUDE...
  WILTON MANORS
  TAMARAC
  PLANTATION
  MARGATE
  FORT LAUDERDALE
  CORAL SPRINGS
  COCONUT CREEK

VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE
IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A
SUBSTANTIAL SHELTER.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN MxIAMI.

LAT...LON 2603 8025 2606 8010 2633 8019 2631 8035

What forecasters said that day

The local office's own words before this severe thunderstorm 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, May 12, 9:22 AM EDT, 4 hours 26 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE MIAMI, FL
922 AM EDT WED MAY 12 1999

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

0453 PM    MIAMI NEW TAMIAMI ARPT    FL   .75 INCH HAIL
05/11/99   DADE                           DIME SIZE HAIL OBSERVED AT
                                          TAMIAMI AIRPORT.

The office that day

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

IssuedProductOfficeCountiesLasted
May 12, 1:05 PM EDTSevere Thunderstorm WarningMFLPalm Beach25 min
May 12, 1:14 PM EDTSevere Thunderstorm WarningMFLMiami-Dade31 min
May 12, 1:45 PM EDTSevere Thunderstorm WarningMFLMiami-Dade45 min
May 12, 2:14 PM EDTSevere Thunderstorm WarningMFLPalm Beach31 min
May 12, 2:23 PM EDTSevere Thunderstorm WarningMFLBroward37 min
May 12, 2:30 PM EDTSevere Thunderstorm WarningMFLMiami-Dade45 min
May 12, 2:46 PM EDTSevere Thunderstorm WarningMFLPalm Beach29 min
May 12, 2:49 PM EDTSevere Thunderstorm WarningMFLCollier, Hendry41 min
May 12, 3:15 PM EDTSevere Thunderstorm WarningMFLBroward, Palm Beach45 min
May 12, 3:15 PM EDTSevere Thunderstorm WarningMFLMiami-Dade45 min
May 12, 3:51 PM EDTSevere Thunderstorm WarningMFLBroward39 min
May 12, 6:37 PM EDTSevere Thunderstorm WarningMFLMiami-Dade63 min
May 12, 7:27 PM EDTSevere Thunderstorm WarningMFLMiami-Dade63 min

Nearby

Severe Thunderstorm Warnings in Florida, 1999Every severe thunderstorm warning 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.