Alert archive / Florida / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 13, NWS Miami, FL
NWS Miami, FL issued this severe thunderstorm warning at Mar 3, 1999, 11:42 AM EST for Monroe County, Florida. It was in force for 63 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
- Mar 3, 1999, 11:42 AM EST (16:42 UTC)
- Expired
- Mar 3, 1999, 12:45 PM EST
- In force
- 63 min
- Issued by
- NWS Miami, FL
- Area
- Whole counties
County Monroe County, FL
The radar
The Miami radar (KAMX), 51 km from the middle of the area, began a volume at 16:43 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Mar 3, 11:50 AM EST | Thunderstorm Wind 60 | Marathon, 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.
The nearest sounding before it
Miami, FL (KMFL), launched 12:00Z, 4.7 hours before the alert went out and 69 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
- 365 J/kg
- Mixed-layer CIN
- -51 J/kg
- Mixed-layer LCL
- 946 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 151 m²/s²
- 0-3 km storm-relative helicity
- 143 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMIA 031643 SVRMIA FLC087-031745- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MIAMI FL 1142 AM EST WED MAR 3 1999 THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... MONROE MIDDLE KEYS IN SOUTHERN FLORIDA MONROE LOWER KEYS IN SOUTHERN FLORIDA * UNTIL 1245 PM EST * AT 1040 AM EST...KEY WEST RADAR INDICATED A SEVERE THUNDERSTORM ABOUT 10 MILES SOUTHWEST OF 7 MILE BRIDGE. THIS THUNDERSTORM IS MOVING TOWARD THE NORTHEAST AND WILL AFFECT THE AREA FROM SEVEN MILE BRIDGE TO DUCK KEY. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH... LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. SEEK SHELTER IN A STRONG BUILDING. STAY AWAY FROM WINDOWS. DO NOT USE TELEPHONES OR ELECTRICAL APPLIANCES.
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 3, 8:03 AM EST, 3 hours 39 minutes before
AMZ610-630-631-650>654-656-670>676-FLZ063-066>078-032200- SOUTH FLORIDA HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE MIAMI FL 800 AM EST TUE MAR 2 1999 A BAND OF THUNDERSTORMS...SOME APPROACHING SEVERE LIMITS...WILL MOVE FROM THE GULF OF MEXICO ACROSS SOUTHWEST FLORIDA AND THE LOWER KEYS THIS MORNING. THE ACTIVITY WILL SPREAD EASTWARD OVER INTERIOR SOUTH FLORIDA AND THE MIDDLE KEYS EARLY THIS AFTERNOON AND OVER SOUTHEAST FLORIDA AND THE UPPER KEYS BY MID TO LATE AFTERNOON. MARINERS OVER THE GULF OF MEXICO THIS MORNING SHOULD SEEK SAFE HARBOR TO PROTECT AGAINST WIND GUSTS ABOVE 35 KNOTS AND DEADLY LIGHTNING AND EVEN POWERFUL WATERSPOUTS. OVER LAND...FREQUENT...DEADLY LIGHTNING...WIND GUSTS OF 40 MPH OR HIGHER AND EVEN A TORNADO IS POSSIBLE. PERSONS SHOULD MONITOR THE WEATHER CLOSELY TODAY AND BE PREPARED TO ACTIVATE ANY SEVERE WEATHER PLANS SHOULD A WARNING BE ISSUED OR THREATENING WEATHER BE SIGHHTED. SPOTTER ACTIVATION IS REQUESTED IN COLLIER COUNTY THIS MORNING AND MAY BE REQUIRED IN PALM BEACH...BROWARD AND DADE COUNTIES THIS AFTERNOON.
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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.