300900Z POSITION NEAR 26.7S 83.6E. TROPICAL CYCLONE 17S (SEVENTEEN), LOCATED APPROXIMATELY 1270 NM SOUTH-SOUTHEAST OF DIEGO GARCIA, HAS TRACKED SOUTHEASTWARD AT 31 KNOTS OVER THE PAST SIX HOURS. ANIMATED MULTISPECTRAL SATELLITE IMAGERY DEPICTS A LONGWAVE TROUGH APPROACHING FROM THE WEST THAT HAS SIGNIFICANTLY DISRUPTED THE TC LEAVING ONLY A BROAD LINE OF CONVECTION WITH ALMOST NO ORGANIZATION OR ANY VISIBLE LOW LEVEL CIRCULATION CENTER (LLCC). RECENT MICROWAVE IMAGERY CONFIRMS A SIGNIFICANT DISORGANIZATION OF TC 17S OVER THE LAST SIX HOURS GIVING LOW CONFIDENCE TO THE INITIAL POSITION. A 300406Z METOP-A ASCAT IMAGE SHOWS THAT THE LLCC HAS DETERIORATED SIGNIFICANTLY LEAVING ONLY A ELONGATED LOW LEVEL TROUGH. THE CURRENT INTENSITY IS ASSESSED AT 35 KNOTS AND IS BASED ON THE AFOREMENTIONED ASCAT IMAGE. TC 17S IS EXPECTED TO CONTINUE ITS TRACK SOUTHEAST AND DISSIPATE AS IT GETS FULLY EMBEDDED IN THE PASSING TROUGH. DYNAMIC MODEL GUIDANCE IS IN TIGHT AGREEMENT GIVING HIGH CONFIDENCE TO THE FORECAST TRACK. THIS IS THE FINAL WARNING ON THIS SYSTEM BY THE JOINT TYPHOON WRNCEN PEARL HARBOR HI. THE SYSTEM WILL BE CLOSELY MONITORED FOR SIGNS OF REGENERATION. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 300600Z IS 12 FEET.
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