James Island to Point Grenville WA out 10 NM Marine Forecast
| Tonight...E Wind Around 5 Kt. Seas 3 To 4 Ft. Wave Detail: Sw 4 Ft At 13 Seconds. |
| Mon...E Wind Around 5 Kt, Backing To N In The Afternoon. Seas 3 To 4 Ft. Wave Detail: W 4 Ft At 13 Seconds. |
| Mon Night...Ne Wind Around 5 Kt. Seas 3 To 5 Ft. Wave Detail: W 5 Ft At 15 Seconds. |
| Tue...E Wind Around 5 Kt. Seas 4 To 5 Ft. Wave Detail: W 5 Ft At 14 Seconds. |
| Tue Night...E Wind Around 5 Kt. Seas 4 To 5 Ft. Wave Detail: W 5 Ft At 13 Seconds. |
| Wed...E Wind Around 5 Kt. Seas Around 4 Ft. Wave Detail: W 4 Ft At 12 Seconds. |
| Wed Night...E Wind Around 5 Kt. Seas Around 4 Ft. Wave Detail: Sw 4 Ft At 12 Seconds. |
| Thu...Se Wind Around 5 Kt, Veering To W In The Afternoon. Seas Around 4 Ft. Wave Detail: W 4 Ft At 14 Seconds. A Chance Of Rain In The Afternoon. |
| Thu Night...Nw Wind Around 5 Kt, Veering To Se After Midnight. Seas 4 To 5 Ft. Wave Detail: W 4 Ft At 13 Seconds. A Chance Of Rain. |
| Fri...S Wind Around 5 Kt, Veering To W In The Afternoon. Seas 4 To 5 Ft. Wave Detail: W 2 Ft At 4 Seconds And W 5 Ft At 15 Seconds. A Chance Of Rain. |
| Fri Night...Nw Wind Around 5 Kt, Veering To Ne After Midnight. Seas Around 5 Ft. Wave Detail: W 2 Ft At 5 Seconds And W 5 Ft At 14 Seconds. A Chance Of Rain. |
| Area Forecast Discussion National Weather Service Seattle WA 845pm PST Sunday Jan 18 2026 No changes made in this evening's update. The previous discussion remains below along with an updated aviation section. Synopsis Strong upper level ridge offshore weakening Thursday. Low level flow become light beginning Monday allowing more morning fog to form each morning through Wednesday. Weak system moving over the top of the ridge will try and move into Western Washington late in the week into the weekend. Short Term - Tonight Through Tuesday Night Satellite imagery shows clear skies over most of Western Washington this afternoon. Small patch of fog hanging tough around Olympia. Temperatures at 3 pm/23z were in the mid 40s to mid 50s except around Olympia where temperatures are still near 40. High amplitude upper level ridge offshore remaining in place through Wednesday. Interior surface gradients have already gone light and cross Cascade gradient trending back towards zero. Inversion still in place ( temperature at Paradise on Mount Rainier and at 5000 feet on Mount Baker 53 degrees at 3 pm ) and will strengthen overnight. The cross Cascade gradient will continue to move towards zero through Wednesday. The lighter surface gradients will lead to more fog coverage each morning Monday and Tuesday. By Wednesday expect the fog and low clouds to be thick enough to last into the afternoon hours. High temperatures will drift lower each day starting out in the mid 40s to lower 50s Monday and ending up in just the 40s on Wednesday. Long Term - Wednesday Through Sunday Low confidence in the extended forecast. Previous models runs have had a weak system moving over the top of the weakening ridge offshore. The operational runs have gone dry with the system dissipating before reaching Western Washington with another, all be it weaker, upper level ridge rebuilding offshore. Ensemble wet solutions for Friday are decreasing and now down to less than a quarter of the members. Wet solutions over the weekend also decreasing in the ensembles with a majority of the wet solutions Saturday night and Sunday. Pushing back the possible precipitation has allowed the lower levels of the air mass to warm up with less than 10 percent of the solutions indicating light snow in the lowlands Saturday night and Sunday with no snow solutions before Saturday. With the continued uncertainty will continue with the broadbrush chance pop solution from most of the period. If the trends continue look for the forecast to dry out at least for Thursday and Friday. High temperatures in the 40s with lows in the mid and upper 30s through the period. Marine High pressure/riding will remain offshore through a majority of the week with a thermal trough along the coastline. Fog will be possible in the interior waters Monday morning, with a 50% chance of visibilities less than a mile. There remains no wind concern with the pattern this week (even as the ridge breaks down and a system skirts through towards the end of the week). Seas: 4-6 ft through next weekend. HPR Hydrology No river flooding in the next 7 days. NOAA Seattle WA Office: Watches - Warnings - Advisories WA...None. PZ...None. |
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