Alert archive / Florida / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 27, NWS Melbourne, FL

July 6, 1990Palm Beach County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 6, 1990, 3:45 PM EDT for Palm Beach County, Florida. It was in force for .

The area

The counties it named.

The facts

Issued
Jul 6, 1990, 3:45 PM EDT (19:45 UTC)
Expired
Jul 6, 1990, 3:45 PM EDT
In force
Issued by
NWS Melbourne, FL
Area
Whole counties

County Palm Beach County, FL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 7.8 hours before the alert went out and 203 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, Cape Canaveral, FL at 12:00Z on 1990-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1744 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, Cape Canaveral, FL at 12:00Z on 1990-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 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
1744 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
896 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
40 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KPBI 061951
SVRPBI
FLC099-061945-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE WEST PALM BEACH FL
345 PM EDT FRI JUL 6 1990

THE NATIONAL WEATHER SERVICE IN WEST PALM BEACH HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 445 PM EDT
FOR THE FOLLOWING LOCATIONS...

IN SOUTHEAST FLORIDA

   ...CENTRAL PALM BEACH COUNTY


AT 3:45 PM EDT WEATHER SERVICE RADAR INDICATED A SEVERE THUNDERSTORM 15
MILES NORTHWEST OF WEST PALM BEACH. THIS STORM IS MOVING TO THE SOUTH AT
10 MILES PER HOUR.

RESIDENTS OF CENTRAL AND EASTERN PALM BEACH COUNTY SHOULD BE ON ALERT
OF THIS DANGEROUS STORM FOR THE NEXT HOUR.

DANGEROUS LIGHTNING STRIKES, WINDS IN EXCESS OF 55 MIYLES PER HOUR,
HEAVY DOWNPOURS AND POSSIBLE SMALL HAIL ARE POSSIBLE FOR THE NEXT
HOUR AS THIS STORM MOVES SOUTHWARD THROUGH THE COUNTY.
NNNN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 6, 10:43 AM EDTSevere Thunderstorm WarningMLBPalm Beach62 min
Jul 6, 4:14 PM EDTSevere Thunderstorm WarningMLBPalm Beach61 min
Jul 6, 5:15 PM EDTSevere Thunderstorm WarningMLBMartin, Okeechobee60 min

Nearby

Severe Thunderstorm Warnings in Florida, 1990Every severe thunderstorm warning in 1990

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.