Alert archive / Florida / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 84, NWS Miami, FL

August 5, 1998Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Aug 5, 1998, 5:06 PM EDT for Palm Beach County, Florida. It was in force for 64 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
Aug 5, 1998, 5:06 PM EDT (21:06 UTC)
Expired
Aug 5, 1998, 6:10 PM EDT
In force
64 min
Issued by
NWS Miami, FL
Area
Whole counties

County Palm Beach County, FL

The radar

The Miami radar (KAMX), 115 km from the middle of the area, began a volume at 21:08 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, 9.1 hours before the alert went out and 93 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 1998-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1626 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 1998-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -27 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
1626 J/kg
Mixed-layer CIN
-50 J/kg
Mixed-layer LCL
953 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-27 m²/s²
0-3 km storm-relative helicity
-16 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.

180 
WUUS1 KMIA 052108 RRA
SVRMIA
FLC099-052210-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
506 PM EDT WED AUG 5 1998

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

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

* UNTIL 610 PM EDT

* AT 500 PM...A POSSIBLE SEVERE THUNDERSTORM CONTINUES IN THE
  ROYAL PALM BEACH AND WESTERN SECTIONS OF WEST PALM BEACH.
  MOVEMENT WILL BE SOUTH AT 10 MPH TOWARDS GREENACRES CITY AND
  LAKE WORTH. SOME SMALL HAIL... STRONG WINDS AND PONDING OF
  ROADWAYS CAN BE EXPECT.

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 ELECTRICAL APPLIANCES.

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

Special weather statement, Aug 5, 2:53 PM EDT, 2 hours 13 minutes before
FLZ074-052000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
253 PM EDT WED AUG 5 1998

...SEVERE THUNDERSTORM WARNING FOR DADE CANCELLED...

THE SEVERE THUNDERSTORM THAT WAS OVER CENTRAL DADE COUNTY NEAR
SWEETWATER HAS DECREASED RAPIDLY IN INTENSITY AND SHOULD NO LONGER
PRODUCE SEVERE WEATHER.  THUNDERSTORMS WILL CONTINUE TO BRING LIGHTNING
AND SOME GUSTY WINDS AND HEAVY RAINS TO THE WESTERN SUBURBAN AREAS OF
DADE COUNTY THROUGH 4 PM.
Special weather statement, Aug 5, 2:53 PM EDT, 2 hours 13 minutes before
FLZ074-052000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
253 PM EDT WED AUG 5 1998

...SEVERE THUNDERSTORM WARNING FOR DADE CANCELLED...

THE SEVERE THUNDERSTORM THAT WAS OVER CENTRAL DADE COUNTY NEAR
SWEETWATER HAS DECREASED RAPIDLY IN INTENSITY AND SHOULD NO LONGER
PRODUCE SEVERE WEATHER.  THUNDERSTORMS WILL CONTINUE TO BRING LIGHTNING
AND SOME GUSTY WINDS AND HEAVY RAINS TO THE WESTERN SUBURBAN AREAS OF
DADE COUNTY THROUGH 4 PM.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 5, 2:25 PM EDTSevere Thunderstorm WarningMFLMiami-Dade45 min
Aug 5, 3:26 PM EDTSevere Thunderstorm WarningMFLPalm Beach49 min
Aug 5, 4:01 PM EDTSevere Thunderstorm WarningMFLPalm Beach64 min

Nearby

Severe Thunderstorm Warnings in Florida, 1998Every severe thunderstorm warning in 1998

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.