Typhoon No8 is reaching to Okinawa tonight. It's quite big and strong so there are storm and tidal weave warnings all over Japan. It will be affecting Osaka on Wednesday. The shops may close earlier and trains may stop for a while due to the typhoon.
For more information please check the following site.
http://www.jma.go.jp/jp/typh/
Weather warnings/Advisories
http://www.jma.go.jp/en/warn/index.html
For information about weather in Osaka
http://www.jma.go.jp/en/week/331.html