Alert archive / Florida / Tornado Watches in 2000

Tornado Watch 816

December 16, 200015 counties in Florida; Brooks County, Decatur County, Georgia

The Storm Prediction Center issued this tornado watch at Dec 16, 2000, 5:45 PM CST for 15 counties in Florida; Brooks County, Decatur County, Georgia. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Dec 16, 2000, 5:45 PM CST (23:45 UTC)
Expired: Dec 16, 2000, 10:00 PM CST
In force: 4 hr
Issued by: the Storm Prediction Center

Counties Bay County, FL, Calhoun County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Okaloosa County, FL, Taylor County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Brooks County, GA, Decatur County, GA

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 11.8 hours before the alert went out and 117 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: 143 J/kg
Mixed-layer CIN: -120 J/kg
Mixed-layer LCL: 528 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 226 m²/s²
0-3 km storm-relative helicity: 287 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

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

958 
WWUS9 KMKC 162322
SEL6  

SEL6  
MKC WW 162313
FLZ000-CWZ000-170400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 816
STORM PREDICTION CENTER NORMAN OK
613 PM EST SAT DEC 16 2000

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

   NORTHWEST FLORIDA                            
   COASTAL WATERS                     

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 645 PM UNTIL
1100 PM EST.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 50 STATUTE MILES EITHER SIDE OF
A LINE FROM 35 MILES SOUTH SOUTHWEST OF CRESTVIEW FLORIDA TO 55
MILES EAST SOUTHEAST OF TALAHASSEE 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...  CONTINUE...WW 810...WW 811...WW
812...WW 813...WW 814...WW 815...

DISCUSSION...LINE OF STRONG/SEVERE THUNDERSTORMS WITH EMBEDDED
LEWPS IS MOVING EWD ACROSS THE EXTREME WRN FL PANHANDLE...WHILE
AHEAD OF THE LINE ISOLATED CELLS AREA INCREASING OVER THE NERN GULF
FROM NEAR AQQ SWWD.  AIR MASS REMAINS MOIST AND UNSTABLE WITH
SURFACE DEW POINTS NEAR 70F AND MUCAPE OF 1000-2000 J/KG.  KTAE VAD
WINDS VEER AND INCREASE WITH HEIGHT RESULTING IN FAVORABLE DEEP
LAYER SHEAR AND HELICITY FOR POSSIBLE TORNADIC SUPERCELLS. 


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 22045.


...WEISS

310,0863 304,0832 292,0833 293,0864

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 16, 10:45 AM CST	Tornado Watch	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 5 more	5 hr
Dec 16, 1:30 PM CST	Severe Thunderstorm Watch	SPC	Escambia, Okaloosa, Santa Rosa	6 hr
Dec 16, 4:00 PM CST	Tornado Watch	SPC	Holmes, Jackson	6 hr
Dec 16, 2:30 PM CST	Tornado Watch	SPC	Bartow, Carroll, Catoosa, Chattooga, Dade, Floyd and 8 more	4 hr
Dec 16, 4:00 PM CST	Tornado Watch	SPC	Bartow, Carroll, Catoosa, Chattooga, Dade, Fannin and 11 more	6 hr

Nearby

Tornado Watches in Florida, 2000 Tornado Watches in Georgia, 2000 Every tornado watch in 2000

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.