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

41NM SSW Seattle WA

Marine Point Forecast

[NOTICE]

This Afternoon
WSW 13kt
< 1ft
Tonight
SSW 13kt
< 1ft
Tuesday
SSW 17kt
< 1ft
Tuesday Night
SW 18kt
< 1ft
Wednesday
WSW 11kt
< 1ft
Wednesday Night
W 12kt⇓
< 1ft
Thursday
⇑WSW 9kt
< 1ft
Thursday Night
WSW 9kt⇓
< 1ft
Friday
Light Wind
< 1ft

Associated Zone Forecast which includes this point

Last Update: 11:27 am PDT Apr 13, 2026
Forecast Valid: 1pm PDT Apr 13, 2026-6pm PDT Apr 19, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

WSW wind around 13 kt. A chance of rain, mainly before 2pm. Waves 1 ft or less.

Tonight

SSW wind 9 to 13 kt. A chance of rain, mainly between 2am and 5am. Waves 1 ft or less.

Tuesday

SSW wind 12 to 17 kt. Rain, mainly after 9am. Waves 1 ft or less.

Tuesday Night

SW wind 9 to 18 kt. Rain, mainly before 11pm. Waves 1 ft or less.

Wednesday

WSW wind 5 to 11 kt. A chance of rain, then showers and possibly a thunderstorm after 11am. Waves 1 ft or less.

Wednesday Night

W wind 7 to 12 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 WSW 5 to 9 kt in the afternoon. Mostly sunny. Waves 1 ft or less.

Thursday Night

WSW wind 5 to 9 kt becoming variable and less than 5 kt after midnight. 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.