Alert archive / Florida / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 33, NWS Melbourne, FL

September 16, 1989Flagler County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Sep 16, 1989, 7:05 PM EDT for Flagler County, Florida. It was in force for 55 min.

The area

The counties it named.

The facts

Issued
Sep 16, 1989, 7:05 PM EDT (23:05 UTC)
Expired
Sep 16, 1989, 8:00 PM EDT
In force
55 min
Issued by
NWS Melbourne, FL
Area
Whole counties

County Flagler 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

Jacksonville, FL (KAYS), launched 12:00Z, 11.1 hours before the alert went out and 121 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, Jacksonville, FL at 12:00Z on 1989-09-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 683 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, Jacksonville, FL at 12:00Z on 1989-09-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.193958Sfc1 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
683 J/kg
Mixed-layer CIN
-99 J/kg
Mixed-layer LCL
925 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
79 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDAB 162308
SVRDAB
FLC035-170000-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE DAYTONA BEACH FL
705 PM EDT SAT SEP 16 1989
 
THE NATIONAL WEATHER SERVICE IN DAYTONA BEACH HAS ISSUED A
SEVERE THUNDERSTORM WARNING AND
SPECIAL MARINE WARNING EFFECTIVE UNTIL  800 PM EDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN NORTHEAST FLORIDA
          ...FLAGLER
 
AND ADJOINING COASTAL WATERS.
 
A SEVERE THUNDERSTORM WAS DETECTED BY RADAR 15 MILES SOUTH
SOUTHWEST OF BUNNELL IN FLAGLER COUNTY AND WAS MOVING NORTHEAST
AT 20 MPH.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
 
AS THE THUNDERSTORMS MOVE OUT OVER THE COASTAL WATERS...BOATEERS
IN THE THREATENED AREA CAN EXPECT STRONG WINDS...ROUGH SEAS AND
LIGHTNING. BOATERS SHOULD TAKE NECESSARY ACTION TO AVOID THE
DANGEROUS THUNDERSTORMS.

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, Sep 16, 4:12 PM EDT, 2 hours 53 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DAYTONA BEACH FL
410 PM EDT SAT SEP 16 1989

THUNDERSTORMS WITH VERY HEAVY RAIN...STRONG AND GUSTY WINDS...
DANGEROUS LIGHTNING...AND POSSIBLY SOME HAIL WExRE OVER THE SOUTHWEST
PART OF MARION COUNTY STRETCHING FROM OCALA WESTWARD TO THE LEVY COUNTY
LINE.

THESE THUNDERSTORMS WERE MOVING NORTH AT 10 MPH AND SHOULD CONTINUE
OVER THE WESTERN PART OF MARION COUNTY FOR THE NEXT ONE TO TWO HOURS.

Nearby

Severe Thunderstorm Warnings in Florida, 1989Every severe thunderstorm warning in 1989

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.