https://www.facebook.com/groups/1817419381676514/
Location: 19.0°S 117.1°E
Maximum Winds: 80 kt ( 150km/h)
Gusts: 100 kt (185km/h)
Minimum Central Pressure: 963 mb
CATEGORY 1US
REMARKS:
230900Z POSITION NEAR 19.2S 117.2E.
TROPICAL CYCLONE 21S (VERONICA), LOCATED APPROXIMATELY 260 NM
NORTHEAST OF LEARMONTH, AUSTRALIA, HAS TRACKED SOUTH-
SOUTHEASTWARD AT 03 KNOTS OVER THE PAST SIX HOURS. ANIMATED
MULTISPECTRAL SATELLITE IMAGERY (MSI) DEPICTS A RE-ORGANIZING DEEP
CONVECTIVE EYEWALL SURROUNDING A LARGE 60NM EYE, WHICH SUPPORTS THE
INITIAL POSITION WITH FAIR CONFIDENCE. THE INITIAL INTENSITY IS
ASSESSED AT 80 KNOTS BASED ON MULTIAGENCY DVORAK CURRENT INTENSITY
ESTIMATES RANGING FROM 4.5 TO 5.0 (77 TO 90 KNOTS), BUT IS BELOW THE
230528Z SATCON ESTIMATE OF 94 KTS AND A 230600Z AUTOMATED DVORAK
ESTIMATE OF T5.1. UPPER-LEVEL ANALYSIS INDICATES A MARGINALLY-
FAVORABLE ENVIRONMENT WITH MODERATE POLEWARD OUTFLOW, MODERATE (15
TO 20 KNOTS) EASTERLY VERTICAL WIND SHEAR (VWS), AND DRY AIR
ENTRAINMENT SUGGESTED IN THE MSI AND TOTAL PRECIPITABLE WATER
IMAGERY. TC 21S IS FORECAST TO TRACK SLOWLY SOUTH-SOUTHEASTWARD TO
SOUTHEASTWARD ALONG THE WESTERN PERIPHERY OF A WEAK INDUCED STEERING
RIDGE, WHICH IS POSITIONED BETWEEN TC 21S AND TC 20P. THE SYSTEM IS
FORECAST TO MAINTAIN INTENSITY IN THE SHORT TERM, THEN WEAKEN
SIGNIFICANTLY DUE TO LAND INTERACTION, DRY AIR ENTRAINMENT AND
INCREASING VWS AS IT APPROACHES LAND. AFTER TAU 24, TC 21S IS
FORECAST TO SLOW THEN TRACK WESTWARD AS A STRONG LOW-LEVEL HIGH
BUILDS OVER SOUTHWESTERN AUSTRALIA WITH THE REMNANTS OF THE SYSTEM
EXPECTED TO TRACK WESTWARD. THERE IS A POSSIBILITY THAT THE REMNANTS
MAY TRACK CLOSE TO LEARMONTH, HOWEVER, THERE IS A HIGH CERTAINTY
THAT THE SYSTEM WILL REMAIN A WEAK REMNANT LOW DUE TO THE PRESENCE
OF STRONG UPPER-LEVEL NORTHWESTERLY FLOW AND ASSOCIATED HIGH VWS
PERSISTING OVER NORTHWEST AUSTRALIA AFTER TAU 48. OVERALL, THERE IS
LOW CONFIDENCE IN THE JTWC FORECAST TRACK DUE TO UNCERTAINTY IN THE
TRACK SPEEDS AND TIMING OF THE WESTWARD TURN WITH A 235NM SPREAD IN
SOLUTIONS AT TAU 72. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 230600Z IS
29 FEET. NEXT WARNINGS AT 231500Z, 232100Z, 240300Z AND 240900Z.
REFER TO TROPICAL CYCLONE 22S (JOANINHA) WARNINGS (WTXS31 PGTW) FOR
SIX-HOURLY UPDATES.//
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