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 >

Hazardous Weather Conditions

Small Craft Advisory in effect from April 14, 06:00 AM PDT until April 14, 10:00 PM PDT

For More Weather Information:

Seattle, WA Local Forecast Office

17NM S Seattle WA

Marine Point Forecast

[NOTICE]

This Afternoon
SW 13kt
1ft
Tonight
SSW 14kt
1ft
Tuesday
SSW 21kt
1-2ft
Tuesday Night
SSW 21kt⇓
1-2ft
Wednesday
SW 9kt
< 1ft
Wednesday Night
W 8kt⇓
< 1ft
Thursday
⇑SW 6kt
< 1ft
Thursday Night
S 6kt
< 1ft
Friday
Light Wind
< 1ft

Associated Zone Forecast which includes this point

Last Update: 11:27 am PDT Apr 13, 2026
Forecast Valid: 3pm PDT Apr 13, 2026-6pm PDT Apr 20, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

SW wind around 13 kt. A chance of rain. Waves around 1 ft.

Tonight

SSW wind around 14 kt. A chance of rain, mainly between 4am and 5am. Waves around 1 ft.

Tuesday

SSW wind 16 to 21 kt, with gusts as high as 27 kt. Rain, mainly after 9am. Waves 1 to 2 ft.

Tuesday Night

SSW wind 16 to 21 kt decreasing to 10 to 15 kt after midnight. Winds could gust as high as 27 kt. Rain. Waves 1 to 2 ft.

Wednesday

S wind 5 to 9 kt becoming SW in the afternoon. Rain, mainly between 11am and 2pm, then showers and possibly a thunderstorm after 2pm. Waves 1 ft or less.

Wednesday Night

W wind 5 to 8 kt becoming variable and less than 5 kt in the evening. Rain likely before 11pm. Waves 1 ft or less.

Thursday

Variable winds less than 5 kt becoming SW around 6 kt in the afternoon. Mostly sunny. Waves 1 ft or less.

Thursday Night

S wind around 6 kt. 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.