Alert archive / Florida / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 6, NWS Melbourne, FL

June 29, 1987Orange County, Seminole County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jun 29, 1987, 6:29 PM EDT for Orange County, Seminole County, Florida. It was in force for 61 min.

The area

The counties it named.

The facts

Issued
Jun 29, 1987, 6:29 PM EDT (22:29 UTC)
Expired
Jun 29, 1987, 7:30 PM EDT
In force
61 min
Issued by
NWS Melbourne, FL
Area
Whole counties

Counties Orange County, FL, Seminole 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

Tampa Bay, FL (KTBW), launched 12:00Z, 10.5 hours before the alert went out and 150 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, Tampa Bay, FL at 12:00Z on 1987-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 787 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, Tampa Bay, FL at 12:00Z on 1987-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -10 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
787 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
877 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-10 m²/s²
0-3 km storm-relative helicity
-3 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 292229
SVRMCO
FLC095-117-292330-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ORLANDO FL
629 PM EDT MON JUN 29 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 730 PM EDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

CENTRAL FLORIDA...NORTHEAST ORANGE AND SOUTHWEST SEMINOLE

AT 628 PM EDT WEATHER SERVICE RADAR SHOWED STRONG THUNDER
STORMS OVER ORANGE AND SEMINOLE COUNTIES FROM JUST NORTH OF
EXECUTIVE AIRPORT TO NEAR SANFORD.

 SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH...
 DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR
 YOUR PROTECTION MOVE TO AN KINTERIOR ROOM ON THE LOWEST FLOOR
 OF YOUR HOME OR BUISNESS. HEAVY RAINS FLOOD ROADS QUICKLY SO SLOW
 DOWN WHEN DRIVING INTO AREAS WHERE WATER COVERS THE ROAD.

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, Jun 29, 3:47 PM EDT, 2 hours 42 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DAYTONA BEACH FL
345 PM EDT MON JUN 29 1987

STRONG THUNDERSTORMS WERE OVER THE WESTERN PART OF VOLUSIA COUNTY IN
THE BARBERVILLE AREA AND OVER THE INTERIOR OF THE STATE IN MARION COUNTY.

THESE THUNDERSTORMS WERE DRIFTING SLOWLY NORTH AT LESS THAN 10 MPH.

STRONG WIND GUSTS HAVE BEEN REPORTED DURING THE PAST HOUR IN THE
BARBERVILLE AREA.

PERSONS IN THE WESTERN PART OF VOLUSIA COUNTY AND IN MARION COUNTY CAN
EXPECT STRONG WINDS...HEAVY RAIN AND DANGEROUS LIGHTNING WITH THESE
THUNDERSTORMS FOR THE REST OF THE AFTERNOON.
Special weather statement, Jun 29, 4:03 PM EDT, 2 hours 26 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ORLANDO FL
400 PM EDT MON JUN 27 1987

AT 400 PM EDT WEATHER SERVICE RADAR SHOWED A STRONG THUNDERSTORM OVER
CENTRAL FLORIDA IN THE EXTREME NORTHERN PART OF LAKE COUNTY.

THIS STORM WAS DRIFTING TO THE NORTH ACCOMPANIED WITH LOCALLY HEAVY
RAIN...STRONG GUSTY WINDS...FREQUENT LIGHTNING STRIKES AND POSSIBLE
SMALL HAIL. TEMPORARY FLOODING OF STREETS AND HIGHWAYS WILL LIKELY
OCCUR FOR THE NEXT 1 	TO 2 HOURS AS THIS STORM MOVES THROUGH THE AREA.

Nearby

Severe Thunderstorm Warnings in Florida, 1987Every severe thunderstorm warning in 1987

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.