Alert archive / Florida / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 17, NWS Miami, FL

February 6, 1998Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Feb 6, 1998, 10:32 PM EST for Palm Beach County, Florida. It was in force for 43 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
Feb 6, 1998, 10:32 PM EST (03:32 UTC)
Expired
Feb 6, 1998, 11:15 PM EST
In force
43 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 03:34 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 00:00Z, 3.5 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 00:00Z on 1998-02-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 9 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 1998-02-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 110 square meters per square second.1939587897117Sfc1 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
9 J/kg
Mixed-layer CIN
-215 J/kg
Mixed-layer LCL
1367 m above ground
0-6 km bulk shear
71 kt
0-1 km storm-relative helicity
110 m²/s²
0-3 km storm-relative helicity
119 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The text

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

830 
WUUS1 KMIA 070333 RRA
SVRMIA
FLC099-070415-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
1032 PM EST FRI FEB 6 1998

THE NATIONAL WEATHER SERVICE IN MIAMI FL HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1115 PM EST
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTHEASTERN FLORIDA

   ...PALM BEACH COUNTY

AT 1035 PM EST... DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS MOVING TOWARD THE PALM BEACH COUNTY METRO AREAS.
THIS LINE SHOULD MOVE OFF THE COAST AFTER 1100 PM. MOVEMENT WILL
BE NORTHEAST AT 35 TO 40 MPH. TREES WERE REPORTED DOWN IN
LOXAHATCHEE WHEN THE LINE WENT THROUGH. SOME HAIL WAS REPORTED
IN LAKE WORTH AND JUPITER.

IF YOU ARE CAUGHT OUTSIDE...SEEK REFUGE FROM THE WEATHER IN A
STRONG BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN A SEVERE THUNDERSTORM.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 6, 8:34 PM ESTSevere Thunderstorm WarningMFLCollier76 min
Feb 6, 8:43 PM ESTSevere Thunderstorm WarningMFLGlades, Hendry77 min
Feb 6, 9:06 PM ESTTornado WarningMFLCollier49 min
Feb 6, 9:35 PM ESTSevere Thunderstorm WarningMFLPalm Beach60 min
Feb 6, 10:14 PM ESTSevere Thunderstorm WarningMFLBroward61 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.