James Island to Point Grenville WA out 10 to 60 NM Marine Forecast
| Today...Nw Wind 10 To 15 Kt. Seas 4 To 6 Ft. Wave Detail: Nw 6 Ft At 7 Seconds And Sw 2 Ft At 16 Seconds. |
| Tonight...Nw Wind 10 To 15 Kt. Seas 4 To 6 Ft. Wave Detail: N 6 Ft At 6 Seconds And Sw 2 Ft At 16 Seconds. |
| Fri...W Wind 5 To 10 Kt. Seas 4 To 5 Ft. Wave Detail: Nw 4 Ft At 7 Seconds And Sw 2 Ft At 15 Seconds. |
| Fri Night...W Wind Around 5 Kt. Seas 3 To 4 Ft. Wave Detail: Nw 3 Ft At 7 Seconds, W 3 Ft At 10 Seconds And Sw 2 Ft At 15 Seconds. |
| Sat...Sw Wind Around 5 Kt. Seas 3 To 4 Ft. Wave Detail: Nw 2 Ft At 7 Seconds, W 3 Ft At 10 Seconds And Sw 2 Ft At 16 Seconds. |
| Sat Night...Nw Wind 5 To 10 Kt. Seas 4 To 5 Ft. Wave Detail: N 3 Ft At 6 Seconds, W 3 Ft At 10 Seconds And Sw 2 Ft At 18 Seconds. |
| Sun...Nw Wind 5 To 10 Kt. Seas 4 To 5 Ft. Wave Detail: N 3 Ft At 5 Seconds, W 3 Ft At 9 Seconds And Sw 2 Ft At 17 Seconds. |
| Sun Night...Nw Wind Around 10 Kt. Seas 4 To 6 Ft. Wave Detail: N 4 Ft At 5 Seconds, W 3 Ft At 9 Seconds And Sw 3 Ft At 15 Seconds. |
| Mon...Nw Wind 5 To 10 Kt. Seas 4 To 6 Ft. Wave Detail: N 4 Ft At 5 Seconds, W 3 Ft At 9 Seconds And Sw 3 Ft At 15 Seconds. |
| Mon Night...Nw Wind 10 To 15 Kt. Seas 5 To 6 Ft. Wave Detail: N 4 Ft At 6 Seconds, W 2 Ft At 10 Seconds And Sw 2 Ft At 15 Seconds. |
| Area Forecast Discussion National Weather Service Seattle WA 918am PDT Thu August 13 2026 .Synopsis Weak upper level trough over the area through Friday night. Air mass somewhat unstable during the afternoon and evening hours over the higher terrain. Weak upper level ridge over the weekend will be replaced by another trough Monday. The trough will hang over the area through most of next week. Onshore flow in the lower levels will keep high temperatures near normal through the period. Short Term - Today through Saturday No significant changes made to the forecast this morning. The previous discussion can be found below along with updates to the aviation section: Satellite imagery shows stratus along the coast moving through the Lower Chehalis Valley and down the Strait of Juan de Fuca early this morning. Cloudless skies over the remainder of the area with a layer of smoke aloft. Upper level trough over the area today will remain in place through Friday night. Air mass becoming unstable over the higher terrain in the afternoon and early evening hours both today and Friday. Model soundings have lifted indexes below 0 over the Cascades and Olympics with CAPE values up to 1000 J/kg at 00z this afternoon and again Friday afternoon. The Fire Weather Watch for the Olympics and Cascades for later today will be upgraded to a Red Flag Warning with this forecast package. What convection that does develop has a high probability of not producing wetting rains and creating gusty and erratic outflow winds near the storm. In the lowlands low level onshore flow with a shallow marine layer just getting east of Puget Sound after sunrise both mornings. The layer will retreat back to the coastline by midday. Highs both days in the 70s and lower 80s inland, mid and upper 60s along the coast. Lows 50s and lower 60s. Upper level trough dissipating Friday night with an upper level ridge back building into Western Washington from the southeast Saturday. Still slightly unstable over the Cascades late in the day for a slight chance of convection. In the lowlands little change with the low level onshore flow pattern remaining intact. Shallow marine layer moving inland in the late night and morning hours will dissipate over all but the coastline by midday. Lows in the 50s and lower 60s. Little change in the highs with 70s and lower 80s inland and mid and upper 60s coast. Smoke aloft remaining over the area at least through Friday. A little bit of mixing with the daytime heating will get some of the smoke down towards the surface but the low level onshore flow will prevent the smoke from getting too bad at the surface Long Term - Saturday Night Through Wednesday Models in good agreement with the upper level ridge remaining over the area through Sunday night before getting replaced by yet another upper level trough Monday. Upper level trough remaining over the area through Wednesday. Low level onshore flow through the period increasing midweek. Air mass over the higher terrain once again becoming unstable late in the day under the trough for at least a slight chance of convection Monday through Wednesday. Little change in the temperatures. Highs 70s and lower 80s inland with mid and upper 60s coast. Lows in the 50s and lower 60s. Increasing onshore flow in the middle of next week cooling highs into the mid 60s to mid 70s. Marine High pressure in the northeast Pacific will weaken going into the end of the week as it gets pushed south into the weekend by systems over the open waters. Diurnal westerly pushes through the Strait of Juan de Fuca remains the primary impact, although chances for Small Craft Advisory conditions remain low until Friday evening and stronger pushes will continue through the weekend. Winds in the coastal waters will decrease tonight as pressure gradients decrease. High pressure looks to rebuild going into next week. Seas remain 3-5 ft through the forecast period. 62 Fire Weather Fire weather concerns remain elevated to critical at times through Friday night. Upper level trough over the area. Air mass becoming unstable over the higher terrain in the afternoon and early evening hours creating a chance for thunderstorms. There is a high probability these storms will not produce wetting rains but could produce gusty erratic outflow winds. The fire weather watch today for the Olympics and Cascades will be upgraded to a warning. If forecast trends continue another fire weather watch could be issued for Friday afternoon and evening with later forecast packages. Upper level trough replaced by an upper level ridge over the weekend lessening but not eliminating the chances for convection over the mountains especially the Cascades. Another upper level trough moving into the area next week will once again increase NOAA Seattle WA Office: Watches - Warnings - Advisories WA...Red Flag Warning until 9pm PDT this evening for East Portion of the Olympic Mountains-West Portion of the Olympic Mountains-West Slopes of the Central Cascades Generally above 1500 Feet-West Slopes of the North Cascades Generally above 1500 Feet. PZ...None. |
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