From Weather Alert@21:1/175 to All on Sat Jan 30 00:13:00 2021
WTPS11 NFFN 292100
TROPICAL DISTURBANCE ADVISORY NUMBER A8 ISSUED FROM RSMC NADI
Jan 292225 UTC.
TROPICAL CYCLONE ANA CENTRE 995HPA WAS LOCATED NEAR 15.3S 175.4E AT
291800 UTC. POSITION POOR ON HIMAWARI-8 EIR IMAGERY AND PERIPHERAL
SURFACE REPORTS. TC ANA MOVING EAST AT ABOUT 11 KNOTS. MAXIMUM
10-MINUTE AVERAGE WINDS NEAR THE CENTRE ESTIMATED AT 35 ABOUT KNOTS.
EXPECT WINDS OVER 33 KNOTS WITHIN 180 NAUTICAL MILES IN NE QUADRANT
AND WITHIN 180 NAUTICAL MILES IN SE QUADRANT
AND WITHIN 100 NAUTICAL MILES IN SW QUADRANT
AND WITHIN 150 NAUTICAL MILES IN NW QUADRANT
DEEP CONVECTION PERSISTS IN LAST 6 HOURS. ORGANISATION IMPROVING WITH
PRIMARY BANDS WRAPPING ONTO SUPPOSED LLCC. TC ANA LIES SOUTH OF AN
UPPER RIDGE IN A NARROW BAND OF A LOW TO MODERATE SHEARED
ENVIRONMENT. GOOD OUTFLOW AND UPPER DIVERGENCE OVER THE SYSTEM. TC
ANA IS BEING STEERED TO THE EAST SOUTHEAST BEFORE SOUTHEAST BY THE
SOUTHERN PERIPHERY OF THE NEAR EQUITORIAL RIDGE LOCATED TO THE
NORTHEAST OF THE SYSTEM.SST IS AROUND 30 DEGREES CELSIUS. DVORAK
ANALYSIS BASED ON CURVED BAND WITH 0.6 WRAP ON LOG 10 SPIRAL YIELDING
DT=3.0, MET AND PT AGREE. FT BASED ON DT THUS T4.0/4.0/D1.5/24HRS.
FORECASTS :
AT 12 HRS VALID AT 300600 UTC 15.9S 176.8E MOV ESE AT 08 KT WITH 40
KT CLOSE TO CENTRE
AT 24 HRS VALID AT 301800 UTC 16.6S 177.7E MOV ESE AT 07 KT WITH 45
KT CLOSE TO CENTRE
OUTLOOK :
AT 36 HRS VALID AT 310600 UTC 17.5S 178.2E MOV SE AT 06 KT WITH 45 KT
CLOSE TO CENTRE
AT 48 HRS VALID AT 311800 UTC 18.4S 178.5E MOV SE AT 06 KT WITH 45 KT
CLOSE TO CENTRE
THE NEXT TROPICAL DISTURBANCE ADVISORY ON TROPICAL DEPRESSION 05F
WILL BE ISSUED AROUND 300200 UTC.
#
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