Alert archive / Florida / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 15, NWS Miami, FL
NWS Miami, FL issued this severe thunderstorm warning at May 21, 1986, 8:11 PM EDT for Broward County, Florida. It was in force for 109 min.
The area
The counties it named.
The facts
- Issued
- May 21, 1986, 8:11 PM EDT (00:11 UTC)
- Expired
- May 21, 1986, 10:00 PM EDT
- In force
- 109 min
- Issued by
- NWS Miami, FL
- Area
- Whole counties
County Broward 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
Key West, FL (KEYW), launched 00:00Z, 0.2 hours before the alert went out and 218 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.
- Mixed-layer CAPE
- 932 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 1008 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.9
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMIA 220011 SVRMIA FLC011-220200- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING NATIONAL WEATHER SERVICE MIAMI FL 811 PM EDT WED MAY 21 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING EFFECTIVE UNTIL 1000 PM EDT FOR PEOPLE IN THE FOLLOWING COUNTY OF SOUTHEAST FLORIDA...BROWARD ...THIS WARNING ALSO INCLUDES THE ADJACENT COASTAL WATERS FOR THE COUNTY JUST MENTIONED ANOTHER SEVERE THUNDERSTORM WARNING HAS BEEN ISSUED FOR BROWARD COUNTY AS YET ANOTHER ROUND OF SEVERE THUNDERSTORMS HAS BEEN DETECTED BY NATIONAL WEATHER SERVICE RADAR. THESE NEW STORMS WERE DEVELOPING ACROSS NORTH BROWARD COUNTY AT 8 PM AND ARE EXPECTED TO INTENSIFY AS THE LINE OF STORMS MOVES SOUTH INTO BROWARD COUNTY. RESIDENTS..MOTORISTS..AND BOATERS SHOULD BE AWARE THAT MORE SEVERE WEATHER IS POSSIBLE AFTER DARK OVER BROWARD COUNTY WITH STRONG WIND GUSTS..HAIL..HEAVY RAIN..AND DANGEROUS LIGHTNING WITH THIS SECOND ROUND OF STORMS. IF THREATENING WEATHER APPROACHES YOU SHOULD GO TO A SAFE PLACE IMMEDIATELY..AND YOU SHOULD ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR SEVERE WEATHER REPORTS TO THE LOCAL NATIONALx WEATHER SERVICE OFFICE.
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, May 21, 2:30 PM EDT, 5 hours 41 minutes before
^MIASPSPBI SEVERE WEATHER AND MARINE STATEMENT NATIONAL WEATHER SERVICE WEST PALM BEACH FL 230PM EDT WED MAY 21 1986 THE SEVERE THUNDERSTORM WATCH EFFECTIVE UNTILL 7PM EDT FOR A LARGE PORTION OF SOUTH AND CENTRAL FLORIDA INCLUDING PALM BEACH...MARTIN...ST LUCIE AND OKECHOBEE COUNTIES THEIR COASTAL WATERS AS WELL AS LAKE OKECHOBEE CONTINUES IN EFFECT. A SEVERE THUNDERSTORM WARNING AND SPECIAL MARINE WARNING IS IN EFFECT FOR WESTERN PALM BEACH AND MORTIN COUNTIES AS WELL AS LAKE OKEECHOBEE UNTILL 345PM. AT 230PM RADAR INDICATES SEVERE THUNDERSTORMS OVER SOUTHERN LAKE OKEECHOBEE AND HEAVY THUNDERSTORMS OVER NORTHERN OKECHOBEE COUNTY MOVING TOWARD THE EAST NORTHEAST AROUND 20 MPH. IF THREATENING WETHER APPROACHES TAKE COVER OR SEEK SAFE HARBOUR IMMEDIATELY. NO REPORTS OF SEVERE WEATHER HAVE BEEN RECEIVED SO FAR..HOWEVER TO REPORT SEVERE WEATHER NOTIFY YOUR NEAREST LAW ENFORCEMENT AGENCY OR CIVIL DEFENSE OFFICE. REMEMBESR..A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS. LISTEN TO YOUR LOCAL RADIO OR TV STATION OR NOAA WEATHER RADIO FOR FURTHER STATEMENTS OR WARNINGS..WHICH WILL BE ISSUED IF CONDITIONS WARRANT.
Special weather statement, May 21, 2:33 PM EDT, 5 hours 38 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MIAMI FL 234 PM EDT WED MAY 21 1986 SEVERE THUNDERSTORM WATCH 204 IS IN EFFECT UNTIL 7 PM FOR THE FOLLOWING COUNTIES OF SOUTH FLORIDA...GLADES HENDRY COLLIER MAINLAND MONROE BROWARD DADE AND THE ADJACENT COASTAL WATERS. AT 234 PM NO SEVERE WEATHER HAS OCCURRED OVER SOUTH FLORIDA. SCATTERED VERY HEAVY THUNDERSTORMS CONTINUED FROM SOUTH OF LAKE OKEECHOBEE NORTH TO SEBRING. THE TAREA EXTENDED TO NEAR THE EAST COAST. THE HEAVIEST STORMS CONTINUED IN NORTHEAST HENDRY COUNTY. THE STORMS WERE MOVING EAST AT 25 MILES AN HOUR.
Special weather statement, May 21, 3:37 PM EDT, 4 hours 34 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MIAMI FL 335 PM EDT WED MAY 21 1986 SEVERE THUNDERSTORM WATCH 204 IS IN EFFECT UNTIL 7 PM FOR THE FOLLOWING COUNTIES OF SOUTH FLORIDA...GLADES HENDRY COLLIER MAINLAND MONROE BROWARD DADE AND THE ADJACENT COASTAL WATERS. AT 335 PM NO SEVERE WEATHER HAS OCCURRED OVER SOUTH FLORIDA. SCATTERED VERY HEAVY THUNDERSTORMS WERE INCREASING FROM VERO BEACH AND JUPITER TO JUST SOUTH OF L}AKE OKEECHOBEE. A FEW VERY HEAVY THUNDERSTORMS HAD FORMED IN NORTHWEST DADE COUNTY. THE STORMS WERE MOVING EAST AT 25 MILES AN HOUR.
Special weather statement, May 21, 4:35 PM EDT, 3 hours 36 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MIAMI FL 428 PM EDT WED MAY 21 1986 SEVERE THUNDERSTORM WATCH 204 IS IN EFFECT UNTIL 7 PM FOR THE FOLLOWING COUNTIES OF SOUTH FLORIDA...GLADES HENDRY COLLIER MAINLAND MONROE BROWARD DADE AND THE ADJACENT COASTAL WATERS. AT 428 PM CLUSTERS OF VERY HEAVY THUNDERSTORMS...EMBEDDED IN LARGE AREAS OF RAIN...CONTINUED OVER MOST OF THE EASTERN PENINSULA FROM INDIAN RIVER COUNTY TO DADE COUNTY. THIS ACTIVITY EXTENDED INTO THE IMMEDIATE OFF- SHORE WATERS. THESE THUNDERSTORMS WERE MOVING TO THE EAST AT 20 MILES AN HOUR.
Special weather statement, May 21, 5:00 PM EDT, 3 hours 11 minutes before
^MIASPSPBI SEVERE WEATHER AND MARINE STATEMENT...CORRECTION... NATIONAL WEATHER SERVICE WEST PALM BEACH FL 500PM EDT WED MAY 21 1986 SEVERE THUNDERSTORM WATCH NO 204 REMAIN IN EFFECTIVE UNTIL 7PM EDT FOR A LARGE PORTION OF SOUTH AND CENTRAL FLORIDA INCLUDING PALM BEACH...MARTIN...ST LUCIE AND OKECHOBEE COUNTIES THEIR COASTAL WATERS AS WELL AS LAKE OKEECHOBEE. AT 455 PM EDT RADAR INDICATES VERY HEAVY THUNDERSTORMS OVER THE SOUTH PORTION OF LAKE OKEECHOBEE AND IN THE COASTAL WATERS OF MARTIN COUNTY. THE THUNDERSTORMS WERE MOVING TO THE EAST NORHEAST AROUND 15 MPH. NO REPORTS OF SEVERE WEATHER HAVE BEEN RECEIVED. REMEMBER..A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS. IF THREATENING WEATHER APPROACHES TAKE COVER IMMEDIATELY.
The office that day
Everything else NWS Miami, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 1:01 PM EDT | Severe Thunderstorm Warning | MFL | Broward, Miami-Dade | 59 min |
| May 22, 1:40 PM EDT | Severe Thunderstorm Warning | MFL | Broward | 65 min |
| May 22, 3:21 PM EDT | Severe Thunderstorm Warning | MFL | Broward | 69 min |
| May 22, 4:35 PM EDT | Severe Thunderstorm Warning | MFL | Broward, Hendry | 85 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.