About This Outlook
As part of our ongoing commitment to supporting mariners and helping stakeholders monitor significant weather conditions, Weathernews has been providing regular port weather highlights across the Arabian Sea and Indian Ocean during the Southwest Monsoon. With the monsoon season now winding down in these regions, we are shifting our focus to the North Pacific and North Atlantic — two key regions where developing weather systems and adverse sea conditions can significantly impact maritime operations.
This week’s outlook highlights notable weather systems and areas of concern across both regions, helping ship operators and other stakeholders anticipate potential challenges to maritime operations.
North Pacific Ocean
Weathernews Maritime Forecaster comment:
This week, a series of low-pressure systems will develop and move from near Japan toward the Bering Sea, bringing rough conditions to surrounding waters across the Northwest Pacific.
From the 26th to the 28th, a low-pressure system will move from southeast of the Kamchatka Peninsula toward the eastern Bering Sea, rapidly intensifying along the way. Seas are expected to become very rough, with significant wave heights exceeding 6 meters in parts of the eastern Aleutian Islands and the Bering Sea.
On the 27th and 28th, a low-pressure system over the Sea of Okhotsk is forecast to merge with the extratropical cyclone transformed from Typhoon No. 30 CHAMPI, resulting in explosive intensification. A typical winter pressure pattern, with high pressure to the west and low pressure to the east, will develop, bringing high waves of around 5 meters to the Sea of Japan. From the latter half of the week into the weekend, as this powerful low-pressure system moves toward the Bering Sea, high waves are expected to spread across a wide area around the Aleutian Islands.
Typhoon activity will also continue to affect waters near the Mariana Islands this week. Typhoon No. 31 IN-FA is moving westward east of Guam while intensifying. By the weekend, it is forecast to move into waters far south of Japan as a super typhoon. Its subsequent development and track will require close monitoring into next week.
Meanwhile, Tropical Storm VANCE, south of Mexico, is moving northwestward with a zone of strong winds. The storm is expected to weaken and dissipate by the 29th. Although tropical depressions have developed repeatedly off the coast of Mexico, the risk of further tropical depression formation is considered low during the latter half of this week.
Surface pressure, wind and wave patterns over the North Pacific Ocean, valid October 26, 2026, 06:00UTC
■ Key heavy weather areas:
- Oct 26–28: A rapidly intensifying low-pressure system moving from southeast of the Kamchatka Peninsula toward the eastern Bering Sea
- Oct 27–28: Winter-type pressure pattern over the northern Sea of Japan
- Oct 28–Nov 1: A powerful low-pressure system moving from near the Kuril Islands toward the Bering Sea
- Oct 26 onward: Typhoon No. 31 IN-FA
North Atlantic Ocean
Weathernews Maritime Forecaster comment:
This week, low-pressure systems are expected to develop and intensify frequently at high latitudes across the North Atlantic, bringing high waves to surrounding waters.
From October 26 to 29, an intensifying low-pressure system will move from off the coast of Ireland across the northern North Sea and into the Norwegian Sea. Strong winds and rising wave heights are expected around the UK and near Norway.
In the latter half of the week, a low-pressure system south of Greenland is forecast to intensify explosively. High waves are expected to persist through around October 31, particularly at high latitudes.
Surface pressure, wind and wave patterns over the North Atlantic Ocean, valid October 26, 2026, 06:00UTC
■ Key heavy weather areas:
- Oct 26–29: An intensifying low-pressure system moving from near Ireland toward the Norwegian Sea
- Oct 29–31: A rapidly intensifying low-pressure system south of Greenland
Disclaimer: This outlook is provided for informational purposes only; our actionable, ship-specific advisories are exclusively available through our paid maritime solutions. Weathernews Inc. assumes no liability for navigational decisions, losses, or damages resulting from reliance on this general overview.
