A very powerful typhoon is pounding Japan.

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Typhoon Ma-on is a very large and powerful typhoon that is moving east of Minami Daito Island in Okinawa Prefecture.

The Meteorological Agency of Japan says typhoon Ma-on was 270 kilometers northeast of Minami Daito Island and moving north at 20 kilometers per hour as of 10 AM on Monday.

The typhoon will reach Tokyo late Tuesday, early Wensday. The typhoon has a central atmospheric pressure of 945 hectopascals.

Winds of up to 162 kilometers per hour are blowing near its center, and more than 90 kilometers per hour within a radius of 170 kilometers.

The typhoon is expected to continue moving northward and may approach the Japanese main islands from Tuesday to Wednesday.
Strong winds of up to 126 kilometers per hour are expected in southern Kyushu, and up to 108 kilometers per hour in northern Kyushu and Shikoku.

Waves are forecast to reach a height of 10 to 12 meters in the Daito Islands, Amami Islands, southern Kyushu and Shikoku.

Heavy rainfall is expected from Kyushu through the Tokai region along the Pacific coast of the main islands, with some areas receiving rains of 50 to 70 millimeters per hour.

Up to 400 millimeters of rain is expected to fall in southern Kyushu and Shikoku, and 350 millimeters in the Tokai region by Tuesday morning. The heavy rain may trigger land slides and flood some areas as well.

Monday, July 18, 2011 10:23 +0900 (JST)

Note:

Tropical cyclones do not necessarily move along the lines

connecting the centers of probability circles.

When a tropical cyclones is expected to become a tropical depression

or an extratropical cyclone during the next 3 to 5 days, a forecast up

to the next 4 days is issued.

Unit:

1KT(knot) = 1.852 km/h = 0.5144 m/s

1NM(nautical mile) = 1.852 km