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:
The North Pacific will be affected by several tropical and extratropical cyclones this week.
In the western North Pacific, Super Typhoon No. 30 (CHAMPI) is moving west-northwestward east of the Philippines. The storm is expected to reach peak intensity tomorrow, October 20. It is forecast to maintain very strong or strong intensity as it moves toward the Sakishima Islands and Taiwan later in the week. Its track from late next week onward remains highly uncertain. Possible scenarios range from a westward track toward mainland China to a turn toward Japan's main island of Honshu. Residents and mariners across a wide area should remain alert to potential impacts.
By midweek, on October 21, a low-pressure system moving from the Sea of Japan toward the Sea of Okhotsk is expected to intensify rapidly. Stronger winds are likely across northern and eastern Japan as a result. During the latter half of the week, the low will move from the Sea of Okhotsk toward the Bering Sea, bringing high waves and strong winds to a broad area, including the vicinity of the Kuril Islands and the western Bering Sea.
In the northeastern Pacific, Hurricane TRUDY is moving slowly westward off the western coast of Mexico. The system is expected to weaken, likely diminishing to tropical depression strength around October 21 before gradually dissipating. Another tropical disturbance could develop south of Mexico around midweek, warranting continued monitoring.
From October 20 to 21, a low-pressure system is forecast to move from south of the Alaska Peninsula into the Gulf of Alaska while intensifying. High waves exceeding 6 meters (approximately 20 feet) are possible near the low and its associated fronts, and marine interests should remain on alert.
Surface pressure, wind and wave patterns over the North Pacific Ocean, valid October 19, 2026, 06:00UTC
■ Key heavy weather areas:
- October 19–25: East of the Philippines toward Taiwan and Japan (Typhoon CHAMPI)
- October 21–24: Japan, the vicinity of the Kuril Islands, and the western Bering Sea (Rapidly intensifying low-pressure system)
- October 19–20: West of Mexico (Hurricane TRUDY)
- October 22–25: South of Mexico (Potential development of a new tropical cyclone)
- October 20–21: Gulf of Alaska (Rapidly intensifying low-pressure system)
North Atlantic Ocean
Weathernews Maritime Forecaster comment:
This week, an upper-level trough will remain nearly stationary from Iceland to north of the United Kingdom, bringing intermittent periods of severe weather to high-latitude areas of the North Atlantic. High waves of around 6 meters (approximately 20 feet) may also develop near the English Channel and the Bay of Biscay during October 20–21 and again from October 22–25.
A well-developed low-pressure system is situated off the eastern coast of the United States, generating high waves between the low and a high-pressure system to its north. This pressure pattern is expected to persist until around October 22, and mariners in the surrounding areas should remain alert to moderately elevated waves.
Surface pressure, wind and wave patterns over the North Atlantic Ocean, valid October 19, 2026, 06:00UTC
■ Key heavy weather areas:
- October 19–25: From south of Greenland to the English Channel (A series of low-pressure systems developing intermittently)
- October 19–22: Off the eastern coast of the United States (Intensifying low-pressure system)
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.
