Alert archive / Florida / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 28, NWS Melbourne, FL

July 6, 1990Palm Beach County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 6, 1990, 4:14 PM EDT for Palm Beach County, Florida. It was in force for 61 min.

The area

The counties it named.

The facts

Issued: Jul 6, 1990, 4:14 PM EDT (20:14 UTC)
Expired: Jul 6, 1990, 5:15 PM EDT
In force: 61 min
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, 8.2 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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 062014
SVRPBI
FLC099-062115-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE WEST PALM BEACH FL
414 PM EDT FRI JUL 6 1990
 
THE NATIONAL WEATHER SERVICE IN WEST PALM BEACH HAS ISSUED A
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
EFFECTIVE UNTIL  515 PM EDT
FOR THE FOLLOWING LOCATIONS...
 
IN SOUTHEAST FLORIDA
 
   ...EASTERN PALM BEACH COUNTY
 
  AND FOR BOATERS ON THE WATERS...
 
   ...JUPITER INLET  TO  PALM BEACH INLET
   ...PALM BEACH INLET  TO  BOYNTON INLET
   ...BOYNTON INLET  TO  BOCA RATON INLET
 
AT 4:15 PM EDT NATIONAL WEATHER RADAR INDICATED A SEVERE THUNDERSTORM
APPROACHING WEST PALM BEACH FROM THE WEST. THIS DANGEROUS STORM WILL
BE PASSING THROUGH THE CITY OF WEST PALM BEACH DURING THE NEXT HOUR.
RESIDENTS OF EASTERN PALM BEACH COUNTY SHOULD BE ON THE ALERT FOR THE
APPROACH OF THIS SEVERE STORM. RESIDENTS CAN EXPECT STRONG GUSTY
WINDS, FREQUENT DANGEROUS LIGHTNING, HEAVY DOWNPOURS, AND POSSIBLE
SMALL HAIL. ALSO...BOATERS ALONG PALM BEACH COUNTY COASTAL WATERS
SHOULD SEEK SAFE HARBOR IMMEDIATELY AS THESE STORMS ARE CAPABLE OF
PRODUCING DANGEROUS LIGHTNING AND ROUGH SEAS AS THEY MOVE OFFSHORE.
 
THIS IS A DANGEROUS STORM.  IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND
DEADLY LIGHTNING.  PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS.
 
 
NNNN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 10:43 AM EDT	Severe Thunderstorm Warning	MLB	Palm Beach	62 min
Jul 6, 3:45 PM EDT	Severe Thunderstorm Warning	MLB	Palm Beach
Jul 6, 5:15 PM EDT	Severe Thunderstorm Warning	MLB	Martin, Okeechobee	60 min

Nearby

Severe Thunderstorm Warnings in Florida, 1990 Every 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.