Category 1 Ma-on strikes Japan

Category 1 Ma-on strikes Japan

On July 19, 2100 UTC, Ma-on was approximately 260 nautical miles west-southwest of Yokosuka, Japan (near latitude 33.6N and longitude 134.8E) and moving east-northeast at 6 knots. In the next 12-24 hours, Ma-on is expected to steer away from Honshu and eventually re-curve northeast into open waters.

Storm-Centered Visible (Colorized) (MTSAT; NOAA/SSD)

Ma-on has maximum sustained winds of 65 knots. Ma-on is expected to gradually weaken as it brushes along the coast of Shikoku and southern Honshu during the next 24-48 hours. Rapid weakening is expected after 72 hours and eventually Ma-on will transition to an extra-tropical storm.

Prognostic Reasoning

Heavy rainfall was observed along the coast and mountainous regions of Shikoku and Kansai from this event. Rainfall accumulations of around 500 mm are expected, with some areas having over 500 mm along with flash floods and mudslides.

The event made landfall near Muroto, Kochi over a very sparsely populated region. Ma-on is likely to cause significant rainfall-induced flooding damage to agriculture and property when compared to wind damage. The insured losses from this event are expected to be less than $250 million USD.

Users of EQECAT’s Asia Typhoon Model are advised to use the following event IDs to ascertain the impacts on their portfolio from this event: 56437, 78714, 85423, and 123724. EQECAT will continue to monitor this event and provide updates as more information becomes available.

EQECAT’s Asia Typhoon Model

Tropical Storm MA-ON Forecast/Advisory (JTWC)

Tropical Storm MA-ON Prognostic Reasoning (JTWC)

Tropical Storm MA-ON JMV 3.0 Data (JTWC)


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