Alert archive / Florida / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 7, NWS Melbourne, FL

March 15, 1986Flagler County, Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Mar 15, 1986, 8:38 AM EST for Flagler County, Volusia County, Florida. It was in force for 52 min.

The area

The counties it named.

The facts

Issued
Mar 15, 1986, 8:38 AM EST (13:38 UTC)
Expired
Mar 15, 1986, 9:30 AM EST
In force
52 min
Issued by
NWS Melbourne, FL
Area
Whole counties

Counties Flagler County, FL, Volusia 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, 1.6 hours before the alert went out and 113 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 1986-03-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 725 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 1986-03-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 square meters per square second.1939587897117Sfc1 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
725 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
731 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
114 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDAB 151338
SVRDAB
FLC035-127-083-151430-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE DAYTONA BEACH FL
838 AM EST SAT MAR 15 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM AND 
SPECIAL MARINE WARNING EFFECTIVE UNTIL 930 AM EST FOR PEOPLE IN THE 
FOLLOWING COUNTIES OF

EAST CENTRAL FLORIDA...FLAGLER...NORTHERN VOLUSIA AND EASTERN MARION
...THIS WARNING ALSO INCLUDES THE ADJACENT COASTAL WATERS FOR THE
COUNTIES JUST MENTIONED

RADAR SPOTTED A SEVERE THUNDERSTORM OVER EASTERN MARION
COUNTY NEAR THE OCALA FOREST. THE THUNDERSTORM WAS MOVING EAST
30 MPH.

THIS THUNDERSTORM WILL LIKELY HAVE DAMAGING WINDS..LARGE HAIL
AND DANGEROUS LIGHTNING.

THE THUNDERSTORM WILL PASS OVER LAKE GEORGE.

IF YOU ARE IN OR NEAR THE WARNED AREA GET TO A REINFORCED SHELTER
AND PREPARE FOR STRONG DAMAGING WINDS..LARGE HAIL..VERY HEAVY RAIN..
AND DANGEROUS LIGHTNING.

REMEMBER)..THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO
WITH LITTLE OR NO ADVANCE WARNING.

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, Mar 15, 7:54 AM EST, 44 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DAYTONA BEACH FL
740AM EST SAT MAR 15 1986

A TORNADO WATCH HAS BEEN PLACED IN EFFECT UNTIL 2 PM EST THIS AFTERNOON
FOR MARION..VOLUSIA..FLAGLER..BREVARD..AND INDIAN RIVER COUNTIES AND
INCLUDES THE ADJACENT COASTAL WATERS. THE WATCH IS ALSO IN FOR MOST OF
THE REMAINING COUNTIES OF CENTRAL FLORIDA..

A LINE OF SEVERE THUNDERSTORMS EXTENDED ACROSS NORTHWEST FLORIDA FROM
JUST NORTHEAST OF GAINESVILLE THROUGH OCALA TO THE WEST COAST NEAR
CRYSTAL RIVER AND HOMOSASSA SPRINGS AND CONTINUED FOR SEVERAL MILES
INTO THE GULF. VERY STRONG THUNDERSTORMS WERE ALSO OCCURRING ALONG
THE EAST COAST BETWEEN FLAGLER BEACH AND ST AUGUSTINE.

THESE THUNDERSTORMS ARE SEVERE AND ARE LIKELY TO PRODUCE STRONG
DAMAGING WINDS..POSSIBLY DANGEROUS HAIL..AS WELL AS VERY HEAVY RANFALL
AMOUNTS ENOUGH TO CAUSE RAPID FLOODING OF LOW LYING AREAS.

IN ADDITION A TORNADO WATCH INDICATES CONDITIONS ARE FAVORABLE FOR THE
DEVLOPMENT OF TORNADOES ALONG WITH THESE SEVERE THUNDERSTORMS.

THE THUNDERSTORMS WERE MOVING EAST TO NORTHEAST AT 25 MPH.

IF YOU ARE IN THE PATH OF THESE THUNDERSTORMS YOU SHOULD SEEK SAFE
SHELTER IMMEDIATELY.

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 15, 8:38 AM ESTSevere Thunderstorm WarningMLBMarion52 min
Mar 15, 3:00 PM ESTTornado WarningMLBPalm Beach30 min

Nearby

Severe Thunderstorm Warnings in Florida, 1986Every severe thunderstorm warning in 1986

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.