Alert archive / Florida / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 7, NWS Melbourne, FL

July 2, 1987Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 2, 1987, 5:39 PM EDT for Osceola County, Florida. It was in force for 66 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
Jul 2, 1987, 5:39 PM EDT (21:39 UTC)
Expired
Jul 2, 1987, 6:45 PM EDT
In force
66 min
Issued by
NWS Melbourne, FL
Area
Whole counties

County Osceola 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
Jul 2, 6:11 PM EDTThunderstorm Wind 50Osceola, 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

Tampa Bay, FL (KTBW), launched 12:00Z, 9.7 hours before the alert went out and 129 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 1987-07-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 890 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 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 1987-07-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -42 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
890 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
759 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
-42 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 022139
SVRMCO
FLC097-022245-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ORLANDO FL
539 PM EDT THU JUL 2 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 645 PM EDT FOR PEOPLE IN THE FOLLOWING 
COUNTY OF

CENTRAL FLORIDA...OSCEOLA

AT 537 PM EDT WEATHER SERVICE RADAR SHOWED A VERY STRONG
THUNDERSTORM OVER OSCEOLA COUNTY ALONG THE KISSIMMEE RIVER.
THIS THUNDERSTORM WAS MOVING TO THE NORTH AT 10 MILES AN HOUR.

WHEN THUNDERSTORMS ARE OCCURING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING. DO NOT STAND BY WINDOWS. DONT USE TELEPHONES
OR ELECTRICAL APPLIANCES EXCEPT IN AN EMMERGENCY UNTIL THE
STORM HAS PASSED.

 SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 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 BUISNESS. HEAVY RAINS FLOOD ROADS QUICKLY SO SLOW
 DOWN WHEN DRIVING INTO AREAS WHERE WATER COVERS THE ROAD.

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