Alert archive / Florida / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 34, NWS Miami, FL
NWS Miami, FL issued this severe thunderstorm warning at May 9, 1999, 2:56 PM EDT for Collier County, Florida. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 9, 1999, 2:56 PM EDT (18:56 UTC)
- Expired
- May 9, 1999, 3:30 PM EDT
- In force
- 34 min
- Issued by
- NWS Miami, FL
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Collier 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, 6.9 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
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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, 21 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, 21 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, 3:13 PM EDT | Severe Thunderstorm Warning | MFL | Palm Beach | 32 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.