Category 5 Super Typhoon Ragasa moves WNW across the Philipp…
Himawari-9 – CIMSS Satellite Blog (Scott Bachmeier)
2.5-minute Himawari-9 Infrared images [click to play animated GIF | MP4]
2.5-minute Target Sector Himawari-9 Infrared images (above) showed Ragasa as it intensified from a Category 4 Typhoon at 0000 UTC on 21 September 2025 to a Category 5 (140-knot) Super Typhoon at 0600 UTC and then further to a 145-knot Super Typhoon by 1200 UTC (SATCON). The primary environmental factor that favored this intensification was low values of deep-layer wind shear (below) — and Ragasa also traversed a lobe of slightly warmer waters (SST | OHC) as it reached Category 5 intensity.
Himawari-9 Infrared images, with contours and streamlines of deep-layer wind shear at 2100 UTC on 21 September
Ragasa was undergoing an eyewall replacement cycle during the later portion of the day on 21 September, which was evident in the MIMIC-TC product (below).
MIMIC-TC product
After sunrise on 22 September, 2.5-minute Himawari-9 Visible images (below) revealed the presence of low-level mesovortices within the large eye.
2.5-minute Himawari-9 Visible images [click to play animated GIF | MP4]
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