Alert archive / Florida / Tornado Watches in 2002

Tornado Watch 771

November 16, 2002Broward County, Miami-Dade County, Monroe County, Florida

The Storm Prediction Center issued this tornado watch at Nov 16, 2002, 8:35 PM EST for Broward County, Miami-Dade County, Monroe County, Florida. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Nov 16, 2002, 8:35 PM EST (01:35 UTC)
Expired
Nov 17, 2002, 2:00 AM EST
In force
5 hr
Issued by
the Storm Prediction Center

Counties Broward County, FL, Miami-Dade County, FL, Monroe County, FL

The radar

The Key West radar (KBYX), 80 km from the middle of the area, began a volume at 01:39 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

Key West, FL (KEYW), launched 00:00Z, 1.6 hours before the alert went out and 84 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, Key West, FL at 00:00Z on 2002-11-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1505 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, Key West, FL at 00:00Z on 2002-11-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 160 square meters per square second.19395878Sfc1 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
1505 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
625 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
160 m²/s²
0-3 km storm-relative helicity
204 m²/s²
Significant tornado parameter
1.4
Supercell composite
8.8

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 170134
SEL1  
SPC WW 170135
FLZ000-CWZ000-170700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 771
STORM PREDICTION CENTER NORMAN OK
935 PM EDT SAT NOV 16 2002

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

   EXTREME SOUTHERN FLORIDA PENINSULA                            
   COASTAL WATERS                     

EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 935 PM UNTIL
300 AM EDT.

TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 60 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 50 STATUTE MILES EAST AND WEST
OF A LINE FROM 10 MILES SOUTHEAST OF KEY WEST FLORIDA TO 35 MILES
NORTH OF MIAMI FLORIDA.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

OTHER WATCH INFORMATION...  REPLACE  ...WW 770...

DISCUSSION...ISOLATED THREAT FOR TORNADOES DURING THE NEXT FEW
HOURS AS A WEAK AREA OF LOW PRESSURE MOVES FROM THE FL KEYS NEWD
ACROSS THE SRN FL PENINSULA COUNTIES ALONG STATIONARY SURFACE
TROUGH.    

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH...EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 50 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 22035.

...IMY

261,0792 242,0805 242,0822 261,0810

NNNN

Nearby

Tornado Watches in Florida, 2002Every tornado watch in 2002

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.