Point Grenville to Cape Shoalwater WA out 10 NM Marine Forecast
| Tonight...Nw Wind 5 To 10 Kt. Seas 4 To 5 Ft. Wave Detail: W 5 Ft At 8 Seconds. Patchy Dense Fog Late. |
| Tue...Nw Wind Around 5 Kt, Rising To 5 To 10 Kt In The Afternoon. Seas 3 To 5 Ft. Wave Detail: Nw 4 Ft At 8 Seconds. Patchy Dense Fog In The Morning. |
| Tue Night...Nw Wind 5 To 10 Kt, Easing To Around 5 Kt After Midnight. Seas 3 To 5 Ft. Wave Detail: Nw 5 Ft At 8 Seconds. |
| Wed...Nw Wind Around 5 Kt, Backing To W In The Afternoon. Seas 3 To 4 Ft. Wave Detail: W 4 Ft At 9 Seconds And Sw 2 Ft At 15 Seconds. |
| Wed Night...Nw Wind 5 To 10 Kt, Backing To W After Midnight. Seas 4 To 5 Ft. Wave Detail: W 4 Ft At 9 Seconds And Sw 2 Ft At 14 Seconds. |
| Thu...S Wind Around 5 Kt, Rising To Around 10 Kt In The Afternoon. Seas 4 To 5 Ft. Wave Detail: W 5 Ft At 9 Seconds And Sw 2 Ft At 15 Seconds. |
| Thu Night...Sw Wind 5 To 10 Kt. Seas 4 To 5 Ft. Wave Detail: W 5 Ft At 9 Seconds. |
| Fri...S Wind 5 To 10 Kt. Seas 4 To 5 Ft. Wave Detail: W 5 Ft At 9 Seconds. |
| Fri Night...W Wind 5 To 10 Kt. Seas 3 To 5 Ft. Wave Detail: W 4 Ft At 8 Seconds. |
| Sat...Sw Wind 5 To 10 Kt. Seas 3 To 4 Ft. Wave Detail: W 4 Ft At 8 Seconds And Sw 2 Ft At 23 Seconds. |
| Sat Night...W Wind 5 To 10 Kt, Becoming Sw After Midnight. Seas 4 To 5 Ft. Wave Detail: W 4 Ft At 7 Seconds And Sw 2 Ft At 22 Seconds. |
| Area Forecast Discussion National Weather Service Seattle WA 825pm PDT Monday July 20 2026 Hazy conditions are leading to a picturesque sunset this evening. Currently, most wildfire smoke remains aloft with only localized areas of moderate air quality observed across western Washington. For tonight, dry weather remains in the forecast as high-level cloud coverage streams overhead. Can't rule out the development of marine stratus overnight but this activity will like remain along the coast. Overnight lows are to range between the mid 50s to lower 60s with urban centers being the warmest. The previous discussion remains below along with an updated marine/aviation section: Synopsis A warming and drying trend will continue across western Washington through the middle of the week, with temperatures reaching the low 90s for many lowland areas Tuesday and Wednesday. Onshore flow will increase during the latter half of the week, bringing cooler temperatures with chances for showers and morning low clouds. Short Term - Tonight Through Wednesday Night An upper level ridge will continue to build over the Great Basin through the middle of the week, with a low pressure system situated offshore. This will maintain southerly flow aloft over western Washington, pulling in warmer air through Wednesday. Temperatures today are on track to peak well into the 80s across much of the lowlands, with further warming bringing temperatures closer to 90 degrees on Tuesday. By Wednesday, many areas east and south of the Puget Sound will see high temperatures peaking in the low to mid 90s, which may result in the warmest day of the year so far. This will also correspond to widespread areas of both Moderate (Orange) and Major (Red) HeatRisk on Tuesday and Wednesday, which reflects an increased risk of heat-related illness to those without access to cooling or hydration. A Heat Advisory remains in effect for all inland lowland areas from Tuesday morning to Wednesday evening. In addition to the heat, northerly flow at times will pull wildfire smoke from British Columbia into Whatcom and Skagit Counties, and an Air Quality Alert has been issued by the Northwest Clean Air Agency. Weak easterly flow tonight into Tuesday will also bring wildfire smoke from eastern Washington west of the crest tonight into Tuesday. While incoming wildfire smoke may cause localized degradations in air quality at times over the mountains, the smoke is not expected to mix down into the lower levels and is favored to stay east of the Seattle metro. Long Term - Thursday Through Monday The remnants of tropical storm Elida will meander northward late Wednesday into Thursday, and while confidence is low, this may produce isolated thunderstorms over higher elevations. Increased onshore flow by Friday will bring in more seasonable temperatures in the upper 70s to the region, with a return to morning low clouds and afternoon sunbreaks. Models struggle to come into agreement over the potential for any incoming showers in the long term, with ensembles maintaining chances for showers over the northern Olympic Peninsula and northern interior through the weekend and into early next week. 15 Marine High pressure will remain centered offshore with lower pressure inland through the week. Onshore gradients will ease through the early part of the week as thermally-induced low pressure develops across Western Washington and Oregon. Stronger onshore flow and pushes down the strait look to resume in the latter half of the week as the thermal trough shifts eastward. 27 Fire Weather Elevated fire weather concerns will continue through Wednesday due to very warm and dry conditions. Minimum relative humidities will fall as low as 20% to 30% on Tuesday and Wednesday, with drier locations across the southern Puget Sound potentially bottoming out in the teens. In addition, a thermal trough will build along the coast today and will shift inland during the daytime hours and back along the coast overnight each day through Wednesday. While a large degree of uncertainty remains over the track of incoming showers and thunderstorms, the potential for storms coming in from the south late Wednesday into Thursday pose a risk of elevated fire weather conditions, as additional ignitions from lightning cannot be ruled out. Onshore flow will increase by Friday, bringing cooler temperatures and better overnight RH recoveries through the weekend. 15. NOAA Seattle WA Office: Watches - Warnings - Advisories WA... Air Quality Alert until 9am PDT Wednesday for Cascades of Whatcom and Skagit Counties-Foothills and Valleys of the North Cascades-Lowlands of Western Skagit and Northwestern Snohomish Counties-Lowlands of Western Whatcom County. Heat Advisory from 10am Tuesday to 11pm PDT Wednesday for City of Seattle-Downtown Everett / Marysville Area- Eastern Kitsap County-Eastern Strait of Juan de Fuca- Eastside-Foothills and Valleys of Central King County- Foothills and Valleys of Pierce and Southern King Counties-Foothills and Valleys of Snohomish and Northern King Counties-Foothills and Valleys of Thurston and Lewis Counties-Foothills and Valleys of the North Cascades- Foothills of the Western and Southern Olympic Peninsula- Lake Crescent Area Including US 101-Lowlands of Lewis and Southern Thurston Counties-Lowlands of Pierce and Southern King Counties-Lowlands of Western Skagit and Northwestern Snohomish Counties-Lowlands of Western Whatcom County-Middle Chehalis River Valley-Northern Hood Canal-Olympia and Southern Puget Sound-Port Townsend Area- Shoreline / Lynnwood / South Everett Area-Southern Hood Canal. PZ...None. |
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