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, an extensive low-pressure zone will remain stationary over the eastern Bering Sea and the vicinity of the Gulf of Alaska in the North Pacific. As a result, low-pressure systems will successively intensify across the mid- and high latitudes, bringing intermittent periods of severe weather.
From today, November 4, through November 7, a low-pressure system south of the Aleutian Islands will intensify as it moves toward the Gulf of Alaska. Extensive areas of high waves exceeding 6 meters are expected to develop off the west coast of Canada. In addition, multiple low-pressure systems are likely to successively intensify as they move eastward from November 6–8 and again from November 8–10, warranting continued vigilance.
Typhoon No. 31 (IN-FA), currently moving slowly northward south of Japan, is expected to turn northeastward tomorrow, November 5, and transition into an extratropical cyclone around November 6. However, even after becoming an extratropical cyclone, it is expected to bring strong winds and high waves. Continued monitoring will therefore be necessary around the cyclone and over the waters southeast of the Kamchatka Peninsula, south of the Aleutian Islands, and in the Gulf of Alaska.
Near Japan, a winter-type pressure pattern is expected to develop during the latter half of the week, from November 6–8. Westerly to northwesterly winds are expected to strengthen, particularly over northern Japan. At the beginning of next week, caution will also be necessary due to high waves across a wide area extending from the waters east of Japan to south of the Aleutian Islands.
Surface pressure, wind and wave patterns over the North Pacific Ocean, valid November 4, 2026, 06:00UTC
■ Key heavy weather areas:
- Nov 4–7: Developing low-pressure system from south of the Aleutian Islands to the Gulf of Alaska
- Nov 6–8: Developing low-pressure system from south of the Gulf of Alaska to the vicinity of Vancouver
- Nov 4–6: Typhoon No. 31 (In-Fa) over the ocean southeast of Japan
- Nov 6–10: Low-pressure system downgraded from a typhoon, moving across the ocean east of Japan, southeast of the Kamchatka Peninsula, south of the Aleutian Islands, and into the Gulf of Alaska
- Nov 6–8: Winter-type pressure pattern over northern Japan
- Nov 7–10: Developed low-pressure system over the ocean east of Japan and south of the Aleutian Islands
North Atlantic Ocean
Weathernews Maritime Forecaster comment:
This week in the North Atlantic, a low-pressure system accompanied by upper cold air mass is expected to remain stationary near the Azores Islands. From November 6–8, the pressure gradient between this system and a nearby high-pressure system is expected to tighten, resulting in increasingly high waves in some areas.
As the system will be influenced by upper cold air mass, close attention should be paid to any changes in the forecast, particularly the potential for deteriorating conditions.
From the weekend into the beginning of next week, areas around the Iberian Peninsula should also be alert to strong winds and high waves, as well as severe weather phenomena such as thunderstorms.
Surface pressure, wind and wave patterns over the North Atlantic Ocean, valid November 4, 2026, 06:00UTC
■ Key heavy weather areas:
- Nov 6–8: Developing low-pressure system near the Azores Islands
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.
