WTPS12 NFFN 080423
TROPICAL DISTURBANCE ADVISORY NUMBER B7 ISSUED FROM RSMC NADI
Feb 080424 UTC.

EX-TROPICAL CYCLONE OSAI [TD08F] CENTRE 997HPA WAS LOCATED NEAR 17.8S
164.4W AT 080300 UTC.  POSITION FAIR BASED ON VIS/EIR IMAGERY AND
PERIPHERAL SURFACE REPORTS.  
CYCLONE MOVING EAST SOUTHEAST AT ABOUT 6 KNOTS.  MAXIMUM 10-MINUTE
AVERAGE WINDS NEAR THE CENTRE ESTIMATED AT ABOUT 30 KNOTS.  

LLCC FULLY EXPOSED WITH DEEP CONVECTION SHEARED TO THE EAST. EX-TC
OSAI LIES IN AN AREA OF HIGH SHEARED ENVIRONMENT WITH GOOD UPPER
DIVERGENCE TO THE EAST OF THE SYSTEM. SST AROUND 29 DEGREES CELSIUS.
CYCLONIC CIRCULATION EXTENDS UPTO THE 700HPA. THE SYSTEM IS STEERED
EAST-SOUTHEAST ALONG THE SOUTHERN PERIPHERY OF THE NEAR-EQUATORIAL
RIDGE TO THE NORTHEAST. DVORAK ANALYSIS BASED ON SHEARED PATTERN.
YIELDING DT=2.5, MET AND PT AGREE WITH FT BASED ON DT. THUS,
T2.0/2.5/S0.0/24HRS.

FORECASTS :
AT 12 HRS VALID AT 081500 UTC 18.4S 164.5W MOV SSW AT 02 KT WITH 30
KT CLOSE TO CENTRE
AT 24 HRS VALID AT 090300 UTC 18.8S 164.6W MOV WSW AT 02 KT WITH 30
KT CLOSE TO CENTRE

OUTLOOK :
AT 36 HRS VALID AT 091500 UTC 18.9S 165.1W MOV W AT 02 KT WITH 30 KT
CLOSE TO CENTRE
AT 48 HRS VALID AT 100300 UTC 19.0S 165.7W MOV W AT 02 KT WITH 30 KT
CLOSE TO CENTRE

THIS WILL BE THE FINAL TROPICAL DISTURBANCE ADVISORY ISSUED FOR
TD08F.