Alert archive / Florida / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 29, NWS Melbourne, FL

August 2, 1989Orange County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Aug 2, 1989, 6:23 PM EDT for Orange County, Florida. It was in force for 67 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 2, 1989, 6:23 PM EDT (22:23 UTC)
Expired
Aug 2, 1989, 7:30 PM EDT
In force
67 min
Issued by
NWS Melbourne, FL
Area
Whole counties

County Orange County, FL

The radar

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

What was reported inside it

TimeReportWhereRemark
Aug 2, 6:45 PM EDTThunderstorm Wind 50Orange, FL

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 10.4 hours before the alert went out and 81 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 1989-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1693 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 1989-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 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
1693 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
936 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
15 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 KMCO 022234
SVRMCO
FLC095-022330-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ORLANDO FL
623 PM EDT WED AUG 2 1989
 
THE NATIONAL WEATHER SERVICE IN ORLANDO HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  730 PM EDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN CENTRAL FLORIDA
          ...EASTERN ORANGE
 
WEATHER SERVICE RADAR INDICATES A VERY STRONG THUNDERSTORM IN EASTERN
ORANGE COUNTY. THIS THUNDERSTORM IS MOVING SLOWLY TO THE SOUTH.
 
RESIDENTS IN THE AREA OF THIS THUNDERSTORM MAY EXPECT HEAVY RAIN...
FREQUENT LIGHTNING...STRONG GUSTY WIND AND POSSIBLE SMALL HAIL.
 
 
 
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING.  DO NOT STAND BY WINDOWS.  DON'T USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED.  MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.

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 2, 5:38 PM EDT, 45 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DAYTONA BEACH FL
535 PM EDT WED AUG 2 1989

...A SEVERE THUNDERSTORMS WARNING IS IN EFFECT FOR FLAGLER COUNTY
   UNTIL 6PM EDT...

AT 535PM RADAR SHOWED THUNDERSTORMS CAPABLE OF PRODUCING STRONG GUSTY
WINDS...FREQUENT DANGEROUS LIGHTNING...HEAVY DOWNPOURS...AND POSSIBLE
HAIL JUST NORTHWEST OF FLAGLER BEACH...NEAR GAINESVILLE...AND 10 MILES
WEST OF TITUSVILLE.

OTHER THUNDERSTORMSo AND SHOWERS WERE BETWEEN ASTOR PARK AND DUNNELLON
AND FROM THE ORLANDO AREA TO SEBASTIAN.

MOVEMENT WAS SOUTH 15 MPH.
Special weather statement, Aug 2, 5:43 PM EDT, 40 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DAYTONA BEACH FL
535 PM EDT WED AUG 2 1989

...A SEVERE THUNDERSTORM WARNING IS IN EFFECT FOR FLAGLER COUNTY
   UNTIL 615PM EDT...

AT 535PM RADAR SHOWED THUNDERSTORMS CAPABLE OF PRODUCING STRONG GUSTY
WINDS...FREQUENT DANGEROUS LIGHTNING...HEAVY DOWNPOURS...AND POSSIBLE
HAIL JUST NORTHWEST OF FLAGLER BEACH...NEAR GAINESVILLE...AND 10 MILES
WEST OF TITUSVILLE.

OTHER THUNDERSpTORMS AND SHOWERS WERE BETWEEN ASTOR PARK AND DUNNELLON
AND FROM THE ORLANDO AREA TO SEBASTIAN.

MOVEMENT WAS SOUTH 15 MPH.
Special weather statement, Aug 2, 6:18 PM EDT, 5 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ORLANDO FL
620 PM EDT WED AUG 2 1989

WEATHER SERVICE RADAR INDICATES VERY STRONG THUNDERSTORMS
HAVE DEVELOPED IN EAST ORANGE COUNTY. THESE THUNDERSTORMS
ARE MOVING VERY SLOWLY TO THE SOUTH.

SHOWER AND THUNDERSTORM ACTIVITY WILL CONTINUE OVER CENTRAL
FLORIDA FOR THE REMAINDER OF THE AFTERNOON AND EARLY EVENING
HOURS.

RESIDENTS IN THE AFFECTED AREA CAN EXPECT FREQUENT LIGHTNING...
HEAVY RAIN...STRONG GUSTY WIND AND POSSIBLY SMALL HAIL AS THESE
THUNDERSTORMS MOVE THROUGH THEIR AREA.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 5:14 PM EDTSevere Thunderstorm WarningMLBFlagler61 min

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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.