Alert archive / Florida / Tornado Warnings in 1999

Tornado Warning 2, NWS Key West, FL

August 9, 1999Monroe County, Florida

NWS Key West, FL issued this tornado warning at Aug 9, 1999, 6:45 AM EDT for Monroe County, Florida. It was in force for 30 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
Aug 9, 1999, 6:45 AM EDT (10:45 UTC)
Expired
Aug 9, 1999, 7:15 AM EDT
In force
30 min
Issued by
NWS Key West, 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 10:45 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 nearest sounding before it

Miami, FL (KMFL), launched 00:00Z, 10.8 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.

Skew-T log-pSkew-T log-p diagram, Miami, FL at 00:00Z on 1999-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 668 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Miami, FL at 00:00Z on 1999-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -20 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
668 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
1403 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
-20 m²/s²
0-3 km storm-relative helicity
9 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KEYW 091047 RRA
TOREYW
FLC087-091115-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE KEY WEST FL
645 AM EDT MON AUG 9 1999

THE NATIONAL WEATHER SERVICE IN KEY WEST HAS ISSUED A

* TORNADO WARNING FOR...
  IN SOUTHERN FLORIDA...THE LOWER KEYS IN MONROE COUNTY
  AND ADJACENT COASTAL WATERS

* UNTIL 715 AM EDT

AT 640 AM...WEATHER SERVICE PERSONNEL OBSERVED A WATERSPOUT AROUND 1
MILE SOUTH OF THE KEY WEST AIRPORT. THE WATERSPOUT WAS MOVING WEST
TO NORTHWEST AT AROUND 10 MPH. THE WATERSPOUT MAY MAKE LANDFALL OVER
THE SOUTH PART OF KEY WEST BY AROUND 650 AM...THEN CONTINUE MOVING
WEST NORTHWEST INTO THE REST OF KEY WEST.

ABANDON MOBILE HOMES! GO IN A NEARBY STURDY BUILDING. AS A LAST
RESORT...LIE FLAT IN A DITCH AND COVER YOUR HEAD.

GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR! STAY AWAY FROM
WINDOWS.




&

Nearby

Tornado Warnings in Florida, 1999Every tornado warning in 1999Tornadoes 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.