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WTPN21 PGTW 252100
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE FORMATION ALERT CANCELLATION//
REF/A/JOINT TYPHOON WRNCEN PEARL HARBOR HI/250151ZJUN2017//
AMPN/REF A IS TROPICAL CYCLONE FORMATION ALERT (WTPN21 PGTW 250200)//
RMKS/
1. REMARKS: THIS CANCELS REF A (WTPN21 PGTW 250200) THE AREA OF
CONVECTION (INVEST 97W) PREVIOUSLY LOCATED NEAR 13.8N 145.6E, IS NOW
LOCATED NEAR 14N 142.6E, APPROXIMATELY 380 NM NORTHEAST OF YAP.
ANIMATED MULTISPECTRAL SATELLITE IMAGERY SHOWS A SLIGHTLY ELONGATED
CIRCULATION WITH AN EXPOSED LOW LEVEL CIRCULATION SHOWING CONVECTION
LOCATED TO THE EAST OF THE DISTURBANCE. A 251850Z SSMIS 91GHZ
MICROWAVE IMAGE SHOWS A FULLY EXPOSED CIRCULATION WITH BROKEN
CONVECTION TO THE NORTH AND EAST OF THE CENTER. THE DISTURBANCE IS
CURRENTLY LOCATED IN AN INCREASINGLY UNFAVORABLE ENVIRONMENT DUE TO
THE TUTT CELL ADVANCING TO THE WEST AHEAD OF 97W. THE DISTURBANCE IS
NOW IN AREA OF LIMITED UPPER LEVEL DIVERGENCE, MODERATE VERTICAL
WIND SHEAR (15-20 KNOTS), BUT STILL VERY WARM (30-31C) SEA SURFACE
TEMPERATURES. GLOBAL MODELS SHOW THE SYSTEM TRACKING TO THE
NORTHWEST OVER THE NEXT FEW DAYS. MAXIMUM SUSTAINED SURFACE WINDS
ARE ESTIMATED AT 15 TO 20 KNOTS. MINIMUM SEA LEVEL PRESSURE IS
ESTIMATED TO BE NEAR 1021 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A
SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS DOWNGRADED
TO MEDIUM.//