Alert archive / Florida / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 35, NWS Miami, FL
NWS Miami, FL issued this severe thunderstorm warning at May 9, 1999, 3:13 PM EDT for Palm Beach County, Florida. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- May 9, 1999, 3:13 PM EDT (19:13 UTC)
- Expired
- May 9, 1999, 3:45 PM EDT
- In force
- 32 min
- Issued by
- NWS Miami, FL
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Palm Beach County, FL
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 9, 2:00 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Miami, FL (KMFL), launched 12:00Z, 7.2 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.
- Mixed-layer CAPE
- 1797 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 812 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- -33 m²/s²
- 0-3 km storm-relative helicity
- -18 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
999 WUUS1 KMIA 091915 RRA SVRMIA FLC099-091945- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MIAMI FL 313 PM EDT SUN MAY 9 1999 THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTH CENTRAL PALM BEACH COUNTY IN FLORIDA * UNTIL 345 PM EDT * AT 313 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 6 MILES NORTH OF NINE MILE BEND...MOVING NORTHEAST AT 5 MPH. VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A SUBSTANTIAL SHELTER. VERY HEAVY RAIN MAY CAUSE PONDING OF WATER ON ROADWAYS. REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN MIAMI. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT SUNDAY EVENING FOR FLORIDA. LAT...LON 2677 8067 2664 8052 2689 8021 2705 8039
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 9, 2:35 PM EDT, 38 minutes before
FLZ063-066>078-100100- SOUTH FLORIDA HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE MIAMI FL 235 PM EDT SUN MAY 9 1999 ...SEVERE THUNDERSTORMS EXPECTED THIS AFTERNOON AND EVENING... VERY UNSTABLE AIR ACROSS SOUTH FLORIDA ALONG WITH A WEAK DISTURBANCE ALOFT WILL TRIGGER SEVERE THUNDERSTORMS ACROSS SOUTH FLORIDA THIS AFTERNOON AND EVENING. THESE THUNDERSTORM ARE CAPABLE OF PRODUCING DAMAGING WIND AND LARGE HAIL...UP TO 2 INCHES IN DIAMETER...ACROSS MUCH OF MAINLAND SOUTH FLORIDA. THE ACTIVITY HAS ALREADY BEGUN ALONG THE SOUTHWEST FLORIDA COAST AND IN PALM BEACH COUNTY AND WILL SPREAD SLOWLY TOWARD THE EAST. IT WILL LIKELY BEGIN AFFECTING THE BROWARD AND DADE METRO AREAS SOMETIME AFTER 4 PM AND MAY LAST INTO THE EVENING HOURS. PERSONS OUTDOORS SHOULD MOVE QUICKLY INDOORS IF THUNDERSTORMS APPROACH. SPOTTER ACTIVATION IS REQUESTED.
Special weather statement, May 9, 2:35 PM EDT, 38 minutes before
FLZ063-066>078-100100- SOUTH FLORIDA HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE MIAMI FL 235 PM EDT SUN MAY 9 1999 ...SEVERE THUNDERSTORMS EXPECTED THIS AFTERNOON AND EVENING... VERY UNSTABLE AIR ACROSS SOUTH FLORIDA ALONG WITH A WEAK DISTURBANCE ALOFT WILL TRIGGER SEVERE THUNDERSTORMS ACROSS SOUTH FLORIDA THIS AFTERNOON AND EVENING. THESE THUNDERSTORM ARE CAPABLE OF PRODUCING DAMAGING WIND AND LARGE HAIL...UP TO 2 INCHES IN DIAMETER...ACROSS MUCH OF MAINLAND SOUTH FLORIDA. THE ACTIVITY HAS ALREADY BEGUN ALONG THE SOUTHWEST FLORIDA COAST AND IN PALM BEACH COUNTY AND WILL SPREAD SLOWLY TOWARD THE EAST. IT WILL LIKELY BEGIN AFFECTING THE BROWARD AND DADE METRO AREAS SOMETIME AFTER 4 PM AND MAY LAST INTO THE EVENING HOURS. PERSONS OUTDOORS SHOULD MOVE QUICKLY INDOORS IF THUNDERSTORMS APPROACH. SPOTTER ACTIVATION IS REQUESTED.
The office that day
Everything else NWS Miami, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 1:42 PM EDT | Severe Thunderstorm Warning | MFL | Glades, Hendry | 63 min |
| May 9, 1:54 PM EDT | Severe Thunderstorm Warning | MFL | Collier | 61 min |
| May 9, 2:24 PM EDT | Severe Thunderstorm Warning | MFL | Palm Beach | 51 min |
| May 9, 2:56 PM EDT | Severe Thunderstorm Warning | MFL | Collier | 34 min |
Nearby
Severe Thunderstorm Warnings in Florida, 1999Every severe thunderstorm warning in 1999
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.