Alert archive / Florida / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 7, NWS Miami, FL

January 3, 19994 counties in Florida

NWS Miami, FL issued this severe thunderstorm warning at Jan 3, 1999, 3:00 AM EST for 4 counties in Florida. It was in force for 45 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: Jan 3, 1999, 3:00 AM EST (08:00 UTC)
Expired: Jan 3, 1999, 3:45 AM EST
In force: 45 min
Issued by: NWS Miami, FL
Area: Whole counties

Counties Broward County, FL, Collier County, FL, Hendry County, FL, Palm Beach County, FL

The radar

The Miami radar (KAMX), 95 km from the middle of the area, began a volume at 08:02 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jan 3, 12:45 AM EST	Tornado Watch	SPC	5 hr

The nearest sounding before it

Miami, FL (KMFL), launched 00:00Z, 8.0 hours before the alert went out and 83 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1088 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 710 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 176 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

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

999 
WUUS1 KMIA 030801 RRA
SVRMIA
FLC011-021-025-051-099-030845-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
300 AM EST SUN JAN 3 1999

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

   * SEVERE THUNDERSTORM WARNING FOR...
     WESTERN PALM BEACH COUNTY IN FLORIDA
     EASTERN HENDRY COUNTY IN FLORIDA
     NORTHWESTERN DADE COUNTY IN FLORIDA
     WESTERN BROWARD COUNTY IN FLORIDA
     SOUTHEASTERN COLLIER COUNTY IN FLORIDA
     INCLUDING VAUGHN...TRAILTOWN...SIX MILE BEND...SAND CUT...
     OKEELANTA...NINE MILE BEND...MONTURA ESTATES...MONROE STATION...
     MAPLE MOUND...LAKE HARBOR...DUDA...DEVILS GARDEN...COW BONE
     ISLAND...CLEWISTON...CANE...CANAL POINT AND BELLE GLADE

   * UNTIL 345 AM EST

   * AT 256 AM EST NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
     LINE OF SEVERE THUNDERSTORMS EXTENDING FROM LAKE OKEECHOBEE...
     SOUTH ACROSS EASTERN HENDRY AND COLLIER COUNTIES...MOVING EAST
     30 MILES PER HOUR.

   * OTHER LOCATIONS IN THE WARNING INCLUDE SOUTH CLEWISTON...PAHOKEE
     AND HARLEM

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 AM EDT FOR FLORIDA.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN MIAMI.

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, Jan 2, 10:00 PM EST, 5 hours before

AMZ610-630-631-650>654-656-670>676-FLZ063-066>078-031100-

SOUTH FLORIDA HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MIAMI FL
1000 PM EST SAT JAN 2 1999

A LINE OF STRONG THUNDERSTORMS WILL MOVE RAPIDLY EAST ACROSS THE
EASTERN GULF OF MEXICO TONIGHT. THIS LINE WILL MOVE INTO GLADES...
HENDRY...AND COLLIER COUNTIES AFTER 100 AM SUNDAY MORNING. THE MAIN
THREAT FROM THESE STORMS WILL BE STRONG WIND GUSTS AND DEADLY
LIGHTNING. SOME OF THESE STORMS MAY REACH SEVERE LIMITS DURING THE
EARLY MORNING HOURS AND ISOLATED TORNADOES ARE POSSIBLE. THESE
STORMS WILL PROGRESS EAST ACROSS THE AREA REACHING THE FLORIDA KEYS
AND WESTERN SECTIONS OF DADE...BROWARD AND PALM BEACH COUNTIES AFTER
200 AM AND THE METROPOLITAN AREAS AFTER 300 AM. ALTHOUGH STORMS MAY
BEGIN TO WEAKEN AS THIS LINE MOVES EASTWARD...RESIDENTS SHOULD
REMAIN ALERT TO THE POTENTIAL FOR SEVERE WEATHER OVERNIGHT TONIGHT
AND BE PREPARED TO TAKE IMMEDIATE ACTION IF A WARNING IS ISSUED.

THOSE WHO OWN NOAA WEATHER RADIOS WITH THE TONE ALERT FEATURE SHOULD
MAKE SURE THE ALERT IS SET TO ON BEFORE GOING TO BED TONIGHT.

STORM SPOTTER ACTIVATION IS REQUESTED AT THIS TIME.

ALSO...FLOOD WATERS IN NORTHEASTERN PALM BEACH COUNTY ARE RECEDING
AND MINIMAL RAINFALL AMOUNTS OF AROUND ONE QUARTER OF AN INCH ARE
EXPECTED UNTIL THE SQUALL LINE ARRIVES. THE FLOOD WARNING WILL BE
ALLOWED TO EXPIRE AT 1005 PM.  HOWEVER...LOCAL RAINFALL AMOUNTS OF 1
TO 2 INCHES ARE POSSIBLE WITH THUNDERSTORMS SUNDAY MORNING AND
RESIDENTS SHOULD BE ALERT FOR ADDITIONAL FLOODING SHOULD THIS OCCUR.

CARROLL

Special weather statement, Jan 2, 10:00 PM EST, 5 hours before

AMZ610-630-631-650>654-656-670>676-FLZ063-066>078-031100-

SOUTH FLORIDA HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MIAMI FL
1000 PM EST SAT JAN 2 1999

A LINE OF STRONG THUNDERSTORMS WILL MOVE RAPIDLY EAST ACROSS THE
EASTERN GULF OF MEXICO TONIGHT. THIS LINE WILL MOVE INTO GLADES...
HENDRY...AND COLLIER COUNTIES AFTER 100 AM SUNDAY MORNING. THE MAIN
THREAT FROM THESE STORMS WILL BE STRONG WIND GUSTS AND DEADLY
LIGHTNING. SOME OF THESE STORMS MAY REACH SEVERE LIMITS DURING THE
EARLY MORNING HOURS AND ISOLATED TORNADOES ARE POSSIBLE. THESE
STORMS WILL PROGRESS EAST ACROSS THE AREA REACHING THE FLORIDA KEYS
AND WESTERN SECTIONS OF DADE...BROWARD AND PALM BEACH COUNTIES AFTER
200 AM AND THE METROPOLITAN AREAS AFTER 300 AM. ALTHOUGH STORMS MAY
BEGIN TO WEAKEN AS THIS LINE MOVES EASTWARD...RESIDENTS SHOULD
REMAIN ALERT TO THE POTENTIAL FOR SEVERE WEATHER OVERNIGHT TONIGHT
AND BE PREPARED TO TAKE IMMEDIATE ACTION IF A WARNING IS ISSUED.

THOSE WHO OWN NOAA WEATHER RADIOS WITH THE TONE ALERT FEATURE SHOULD
MAKE SURE THE ALERT IS SET TO ON BEFORE GOING TO BED TONIGHT.

STORM SPOTTER ACTIVATION IS REQUESTED AT THIS TIME.

ALSO...FLOOD WATERS IN NORTHEASTERN PALM BEACH COUNTY ARE RECEDING
AND MINIMAL RAINFALL AMOUNTS OF AROUND ONE QUARTER OF AN INCH ARE
EXPECTED UNTIL THE SQUALL LINE ARRIVES. THE FLOOD WARNING WILL BE
ALLOWED TO EXPIRE AT 1005 PM.  HOWEVER...LOCAL RAINFALL AMOUNTS OF 1
TO 2 INCHES ARE POSSIBLE WITH THUNDERSTORMS SUNDAY MORNING AND
RESIDENTS SHOULD BE ALERT FOR ADDITIONAL FLOODING SHOULD THIS OCCUR.

CARROLL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 3, 1:01 AM EST	Severe Thunderstorm Warning	MFL	Collier	29 min
Jan 3, 1:07 AM EST	Severe Thunderstorm Warning	MFL	Glades	38 min
Jan 3, 1:28 AM EST	Severe Thunderstorm Warning	MFL	Collier	47 min
Jan 3, 1:42 AM EST	Severe Thunderstorm Warning	MFL	Glades	48 min
Jan 3, 2:14 AM EST	Severe Thunderstorm Warning	MFL	Collier, Hendry	46 min
Jan 3, 2:37 AM EST	Severe Thunderstorm Warning	MFL	Monroe	53 min
Jan 3, 3:00 AM EST	Severe Thunderstorm Warning	MFL	Miami-Dade	45 min
Jan 3, 3:40 AM EST	Severe Thunderstorm Warning	MFL	Broward, Miami-Dade, Palm Beach	40 min
Jan 3, 4:20 AM EST	Severe Thunderstorm Warning	MFL	Broward, Miami-Dade	40 min
Jan 3, 4:20 AM EST	Severe Thunderstorm Warning	MFL	Palm Beach	40 min

Nearby

Severe Thunderstorm Warnings in Florida, 1999 Every 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; radar from the NEXRAD Level II archive.