Super Typhoon Sinlaku to Impact the Marianas and Guam; Severe Weather Threat from the Central Plains to the Great Lakes

Super Typhoon Sinlaku will bring destructive winds, widespread heavy rain/flooding, and thunderstorms to the Marianas Islands into Wednesday. Tropical Storm conditions are likely over Guam. Severe thunderstorms and heavy rain are likely across the Upper Mississippi Valley and Great Lakes region with potential for large to very large hail, damaging wind, and tornadoes through Tuesday. Read More >

For More Weather Information:

Seattle, WA Local Forecast Office

21NM S Seattle WA

Marine Point Forecast

[NOTICE]

Today
SSW 11kt
< 1ft
Tonight
SSW 11kt
< 1ft
Tuesday
SSW 16kt
1ft
Tuesday Night
SSW 16kt
< 1ft
Wednesday
SW 8kt
< 1ft
Wednesday Night
W 7kt⇓
< 1ft
Thursday
Light Wind
< 1ft
Thursday Night
Light Wind
< 1ft
Friday
Light Wind
< 1ft

Associated Zone Forecast which includes this point

Last Update: 11:27 pm PDT Apr 12, 2026
Forecast Valid: 6am PDT Apr 13, 2026-6pm PDT Apr 19, 2026

View Nearby Observations

Detailed Forecast

Today

SSW wind 9 to 11 kt. A chance of rain, mainly between 10am and 3pm. Waves 1 ft or less.

Tonight

SSW wind 9 to 11 kt. A chance of rain, mainly after 4am. Waves 1 ft or less.

Tuesday

SSW wind 9 to 16 kt, with gusts as high as 24 kt. Rain. Waves around 1 ft.

Tuesday Night

SSW wind 8 to 16 kt, with gusts as high as 24 kt. Rain, mainly before 11pm. Waves 1 ft or less.

Wednesday

SW wind 5 to 8 kt. Rain before 2pm, then showers and possibly a thunderstorm, mainly after 2pm. Waves 1 ft or less.

Wednesday Night

W wind 5 to 7 kt becoming variable and less than 5 kt in the evening. Showers likely and possibly a thunderstorm before 8pm, then rain likely between 8pm and 11pm. Waves 1 ft or less.

Thursday

Variable winds 5 kt or less. Mostly sunny. Waves 1 ft or less.

Thursday Night

Variable winds 5 kt or less. Partly cloudy. Waves 1 ft or less.

Friday

Variable winds 5 kt or less. Partly sunny. Waves 1 ft or less.

*Notices:

This forecast is for a single location. For safety concerns, mariners should be aware of the weather over a larger area. Forecast information for a larger area can be found within the zone forecast and the NDFD graphics.
The forecast conditions at a particular point may not exceed the criteria of a Small Craft Advisory, Gale, Storm etc. These watches/warnings/advisories are issued for the entire zone in which the point resides and mariners should act accordingly.