Alert archive / Florida / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 85, NWS Miami, FL

August 6, 1998Broward County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Aug 6, 1998, 10:48 AM EDT for Broward County, Florida. It was in force for 47 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 6, 1998, 10:48 AM EDT (14:48 UTC)
Expired
Aug 6, 1998, 11:35 AM EDT
In force
47 min
Issued by
NWS Miami, FL
Area
Whole counties

County Broward County, FL

The radar

The Miami radar (KAMX), 60 km from the middle of the area, began a volume at 14:49 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, 2.8 hours before the alert went out and 40 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 1998-08-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2556 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 1998-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -15 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
2556 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
779 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-15 m²/s²
0-3 km storm-relative helicity
-22 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.

000 
TTAA00 KMIA 061448 RRA
SVRMIA
FLC011-061535-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
1048 AM EDT THU AUG 6 1998

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN BROWARD COUNTY IN SOUTHEASTERN FLORIDA

* UNTIL 1135 AM EDT

* A SEVERE THUNDERSTORM WAS INDICATED BY RADAR THAT EXTENDED BETWEEN
  TAMARAC AND PLANTATION AT 1045 AM.  THIS THUNDERSTORM WAS DRIFTING
  SLOWLY NORTH.

* RESIDENTS IN LAUDERHILL...NORTH LAUDERDALE AND COCONUT CREEK
  CAN ALSO EXPECT SEVERE CONDITIONS FROM THIS STORM.

WHEN THUNDERSTORMS ARE OCCURRING...MOVE INSIDE A STRONG BUILDING.
DO NOT STAND BY WINDOWS. DO NOT USE TELEPHONES OR ELECTRICAL
APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM HAS PASSED.
MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAINz. 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 6, 6:00 AM EDT, 4 hours 48 minutes before
AMZ610-630-631-650>654-656-670>676-FLZ063-066>078-062200-

SOUTH FLORIDA HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MIAMI FL
600 AM EDT THU AUG 6 1998

...SCATTERED SHOWERS AND THUNDERSTORMS OVER PENINSULA AND KEYS TODAY...

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED MAINLY DURING THE
AFTERNOON HOURS ACROSS MAINLAND SOUTH FLORIDA AND AT ANYTIME IN THE
KEYS. THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING BRIEF WIND GUSTS
TO AROUND 40 MPH... VERY HEAVY RAINS... AND FREQUENT LIGHTNING. IN
ADDITION... ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE OVER THE
MAINLAND.

THE PUBLIC IS ADVISED TO SEEK SHELTER INDOORS AND CONVERSELY TO NOT
SEEK SHELTER BENEATH TREES DURING THUNDERSTORMS. REME|MBER... FLORIDA
LEADS THE NATION IN LIGHTNING DEATHS AND INJURIES.
Special weather statement, Aug 6, 6:00 AM EDT, 4 hours 48 minutes before
AMZ610-630-631-650>654-656-670>676-FLZ063-066>078-062200-

SOUTH FLORIDA HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MIAMI FL
600 AM EDT THU AUG 6 1998

...SCATTERED SHOWERS AND THUNDERSTORMS OVER PENINSULA AND KEYS TODAY...

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED MAINLY DURING THE
AFTERNOON HOURS ACROSS MAINLAND SOUTH FLORIDA AND AT ANYTIME IN THE
KEYS. THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING BRIEF WIND GUSTS
TO AROUND 40 MPH... VERY HEAVY RAINS... AND FREQUENT LIGHTNING. IN
ADDITION... ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE OVER THE
MAINLAND.

THE PUBLIC IS ADVISED TO SEEK SHELTER INDOORS AND CONVERSELY TO NOT
SEEK SHELTER BENEATH TREES DURING THUNDERSTORMS. REME|MBER... FLORIDA
LEADS THE NATION IN LIGHTNING DEATHS AND INJURIES.

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.