Alert archive / Florida / Tornado Warnings in 1999

Tornado Warning 7, NWS Key West, FL

September 19, 1999Monroe County, Florida

NWS Key West, FL issued this tornado warning at Sep 19, 1999, 12:36 PM EDT for Monroe County, Florida. It was in force for 69 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
Sep 19, 1999, 12:36 PM EDT (16:36 UTC)
Expired
Sep 19, 1999, 1:45 PM EDT
In force
69 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 16:39 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 12:00Z, 4.6 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 12:00Z on 1999-09-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 45 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 12:00Z on 1999-09-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -31 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
45 J/kg
Mixed-layer CIN
-129 J/kg
Mixed-layer LCL
1113 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
-31 m²/s²
0-3 km storm-relative helicity
58 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 191636 RRA
TOREYW
FLC087-191740-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE KEY WEST FL
1236 PM EDT SUN SEP 19 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 145 PM EDT

* AT 1233 PM EDT... DOPPLER RADAR AND SPOTTER REPORTS DETECTED A
  WATERSPOUT NEAR MILE MARKERS 18 TO 21...SUGARLOAF KEY...MOVING
  NORTHWEST. THIS WATERSPOUT MAY MOVE ONSHORE IN THE SUGARLOAF
  ...PARK KEY...CUDJOE KEY AREA. ALSO...MOTORISTS BEWARE OF THIS
  WATERSPOUT THAT MAY AFFECT ROADS AND HIGHWAY ONE IF IT MOVES
  ONSHORE.

IF YOU ARE IN THIS AREA...STAY IN A SAFE STURDY BUILDING.









&

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 19, 10:09 AM EDTTornado WarningKEYMonroe51 min

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.