Tropical Storm Chaba will continue to strengthen and could take aim at mainland Japan and its Ryukyu Islands next week.
One person is dead and more than 20 people remain missing after heavy rain from once-Typhoon Megi triggered landslides in eastern China.
A tropical wave is likely to become the Atlantic Basin's next tropical storm as it approaches or crosses the Caribbean Sea later this week.
The first windstorm of the season could blast the northern United Kingdom this week Tuesday as Karl arrives.
A new tropical threat may loom for the Caribbean and North America in the not-too-distant future, while eight more weeks remain in the Atlantic hurricane season.
Karl will pass near Bermuda and lead to increased surf at United States' east coast beaches this weekend.