Alert archive / Florida / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 41, NWS Miami, FL

May 11, 1999Miami-Dade County, Florida

NWS Miami, FL issued this severe thunderstorm warning at May 11, 1999, 4:51 PM EDT for Miami-Dade County, Florida. It was in force for 49 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
May 11, 1999, 4:51 PM EDT (20:51 UTC)
Expired
May 11, 1999, 5:40 PM EDT
In force
49 min
Issued by
NWS Miami, FL
Area
Whole counties

County Miami-Dade County, FL

What was reported inside it

TimeReportWhereRemark
May 11, 5:05 PM EDTThunderstorm Wind 50Cutler Ridge, FL

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 11, 1:00 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 8.9 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 1999-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 851 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 1999-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 square meters per square second.19395878Sfc1 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
851 J/kg
Mixed-layer CIN
-58 J/kg
Mixed-layer LCL
1035 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
33 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 KMIA 112051 RRA
SVRMIA
FLC025-112140-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
451 PM EDT TUE MAY 11 1999

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL AND SOUTHEASTERN DADE COUNTY IN SOUTHEASTERN FLORIDA

* UNTIL 540 PM EDT

* AT 545 PM MIAMI DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM NEAR
  SOUTH MIAMI HEIGHTS MOVING TO THE SOUTHEAST AT 10 MPH. THIS STORM
  HAS PRODUCED DIME SIZE HAIL AT TAMIAMI AIRPORT. THE STORM WILL
  LIKELY AFFECT GOULDS..CUTLER RIDGE..AND PERRINE DURING THE NEXT 30
  TO 45 MINUTES. THE STORM WILL BE ACCOMPANIED WITH LARGE
  HAIL..TORRENTIAL RAINFALL..STRONG GUSTY WINDS..AND FREQUENT
  LIGHTNING.



SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. SEEK SHELTER
IN A STRONG BUILDING. STAY AWAY FROM WINDOWS. DO NOT USE TELEPHONES
OR ELECTtRICAL APPLIANCES.

The office that day

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

IssuedProductOfficeCountiesLasted
May 10, 8:58 PM EDTSevere Thunderstorm WarningMFLGlades, Hendry47 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.