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The transition of Typhoon Atsani to a strong post-tropical storm

By Scott Bachmeier •

Himawari-8 water vapor (6.2 µm) images [click to play MP4 animation]

Himawari-8 water vapor (6.2 µm) images [click to play MP4 animation]

Typhoon Atsani (which reached Category 5 intensity in the West Pacific Ocean on 19 August 2015) began to transition to a strong post-tropical storm on 25 August. JMA Himawari-8 water vapor (6.2 µm) images (above; click to play MP4 animation) showed the transformation as warm/dry air (yellow to red color enhancement) began to wrap into the western and southern portion of the storm. The animation is also available as a very large QuickTime movie (76 Mbytes) or an animated GIF (110 Mbytes).

Surface analyses from the Ocean Prediction Center (below; click to play animation) indicated that the post-tropical storm deepened to a minimum central pressure of 957 hPa at 12 UTC on 25 August, and was producing hurricane-force winds until 00 UTC on 26 August.

West Pacific Ocean surface analyses [click to play animation]

West Pacific Ocean surface analyses [click to play animation]

Categories: Himawari-8, Tropical cyclones