Alert archive / Georgia / Tornado Watches in 1998

Tornado Watch 810

September 2, 199823 counties in Florida; 27 counties in Georgia

The Storm Prediction Center issued this tornado watch at Sep 2, 1998, 10:30 PM EDT for 23 counties in Florida; 27 counties in Georgia. It was in force for 13 hr.

The area

The outline as issued.

The facts

Issued: Sep 2, 1998, 10:30 PM EDT (02:30 UTC)
Expired: Sep 3, 1998, 11:00 AM EDT
In force: 13 hr
Issued by: the Storm Prediction Center

All 50 counties

Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Levy County, FL, Madison County, FL, Marion County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Wakulla County, FL, Atkinson County, GA, Bacon County, GA, Baker County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Dougherty County, GA, Echols County, GA, Glynn County, GA, Grady County, GA, Irwin County, GA, Lanier County, GA, Lowndes County, GA, McIntosh County, GA, Mitchell County, GA, Pierce County, GA, Thomas County, GA, Tift County, GA, Ware County, GA, Wayne County, GA, Worth County, GA

Warnings issued inside it

11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Sep 2, 10:43 PM EDT	Tornado Warning	JAX	Duval	77 min
Sep 2, 11:45 PM EDT	Severe Thunderstorm Warning	JAX	Nassau	75 min
Sep 3, 12:33 AM EDT	Tornado Warning	TAE	Jefferson	47 min
Sep 3, 1:53 AM EDT	Severe Thunderstorm Warning	JAX	Hamilton, Suwannee	77 min
Sep 3, 2:34 AM EDT	Severe Thunderstorm Warning	JAX	Columbia, Gilchrist	91 min
Sep 3, 3:10 AM EDT	Severe Thunderstorm Warning	JAX	Hamilton, Suwannee	90 min
Sep 3, 3:10 AM EDT	Severe Thunderstorm Warning	JAX	Clinch	90 min
Sep 3, 4:04 AM EDT	Severe Thunderstorm Warning	JAX	Columbia, Gilchrist	91 min
Sep 3, 4:59 AM EDT	Severe Thunderstorm Warning	JAX	Alachua	61 min
Sep 3, 5:23 AM EDT	Severe Thunderstorm Warning	JAX	Baker, Bradford, Columbia, Union	62 min
Sep 3, 10:32 AM EDT	Severe Thunderstorm Warning	JAX	Glynn	48 min

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 2.5 hours before the alert went out and 122 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 665 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 508 m²/s²
0-3 km storm-relative helicity: 813 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.

307 
WWUS9 KMKC 030158
SEL0  
MKC WW 030158
FLZ000-GAZ000-031500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 810
STORM PREDICTION CENTER NORMAN OK
958 PM EDT WED SEP 2 1998

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

   NORTHERN FLORIDA                            
   SOUTHERN GEORGIA                            
   AND ADJACENT COASTAL WATERS

EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1030 PM
UNTIL 1100 AM EDT.

TORNADOES...THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS
LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 90 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 15 MILES SOUTHWEST OF TALAHASSEE FLORIDA TO 50
MILES EAST OF JACKSONVILLE 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...THIS TORNADO WATCH REPLACES TORNADO WATCH
NUMBER 809. WATCH NUMBER 809 WILL NOT BE IN EFFECT AFTER 1030 PM
EDT.

DISCUSSION...ISOLATED TORNADOES POSSIBLE OVERNIGHT IN THE NERN
QUADRANT OF HURRICANE EARL. PSEUDO-WARM FRONTAL BOUNDARY MOVING NWD
ACROSS FL WILL ENHANCE ALREADY VERY STRONG LOW LEVEL SHEAR...
FAVORING SHALLOW SUPERCELL DEVELOPMENT DESPITE WEAK INSTABILITY.


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH EXTREME
TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI
WITH MAXIMUM TOPS TO 480.  MEAN STORM MOTION VECTOR 21030.


...VESCIO

313,0843 314,0805 291,0805 285,0843

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 3, 9:45 AM EDT	Tornado Watch	SPC	Bryan, Bulloch, Burke, Candler, Chatham, Dodge and 15 more	7 hr

Nearby

Tornado Watches in Georgia, 1998 Tornado Watches in Florida, 1998 Every tornado watch in 1998

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.