Cape Flattery to Cape Shoalwater WA between 60 and 150 NM Offshore Forecast
| Tonight...N To Nw Winds 15 To 25 Kt. Seas 4 To 7 Ft. |
| Tue...N To Nw Winds 15 To 25 Kt. Seas 5 To 7 Ft. |
| Tue Night...N To Nw Winds 15 To 25 Kt. Seas 5 To 9 Ft. |
| Wed...Nw Winds 15 To 25 Kt. Seas 6 To 9 Ft. |
| Wed Night...Nw Winds 15 To 25 Kt. Seas 6 To 9 Ft. |
| Thu...Nw Winds 15 To 25 Kt. Seas 5 To 8 Ft. |
| Thu Night...Nw Winds 15 To 20 Kt. Seas 5 To 6 Ft. |
| Fri...Nw Winds 10 To 20 Kt. Seas 5 To 6 Ft. |
| Fri Night...Nw Winds 15 To 20 Kt. Seas 5 To 6 Ft. |
| Sat...Nw Winds 15 To 20 Kt. Seas 6 To 7 Ft. |
| Sat Night...Nw Winds 15 To 20 Kt. Seas 6 To 8 Ft. |
| Area Forecast Discussion National Weather Service Seattle WA 405pm PDT Monday August 3 2026 Synopsis Dry and warmer conditions as an upper level ridge offshore moves inland Wednesday and Thursday. A thermally induced trough will develop tonight and remain over the region through Wednesday, resulting in northeasterly winds advecting smoke to Western Washington. The ridge will push eastward late Thursday. Smokey conditions should improve by the end of the week with increased onshore flow. Cooler temperatures favored for the weekend. Short Term - Tonight Through Wednesday Night Latest satellite imagery shows northeasterly flow aloft continuing to advect smoke across Western Washington, resulting in hazy conditions aloft. Northwesterly surface winds has limited near- surface smoke transport today. Temperatures this afternoon expected to peak in the upper 60s along the coast and 70s to low 80s in the interior. An upper level ridge continues to sit offshore this afternoon. It will begin to slowly push inland midweek. A thermally induced trough is expected to develop tonight along the coast and remain in place through midweek. As a result, surface winds will shift north- northeasterly on Tuesday and smoke will descend to the surface from British Columbia and Eastern Washington fires. A gradual warming trend is expected through the latter part of the week. However, with smoke filtering to the surface, it presents a challenging forecast as to how it will affect high temperatures. The current forecast has high temperatures in the 70s along the coast and 80s in the interior on Tuesday. As for Wednesday, temperatures are forecasted in the 70s for the coast and 80s to 90s in the interior. It is possible that observed temperatures are lower than what is in the forecast. In addition, there is uncertainty as to how far west surface smoke will reach. With increasing temperatures, Minor to Moderate (Seattle- Tacoma Metro & Southwest Interior) HeatRisk on Tuesday. More widespread Moderate HeatRisk is expected by Wednesday. Long Term - Thursday Through Monday Long-term guidance is in good agreement that the ridge axis directly over Western Washington will start to push eastward later on Thursday, along with the thermal trough. This will lead to increased onshore flow Thursday night, continuing into next week. Increased onshore flow should improve smokey conditions over the region. However, there is uncertainty as to how quickly conditions will improve. Another hot day expected on Thursday for the interior with temperatures in the mid 80s to 90s. As for the coast, cooler temperatures in the upper 60s to low 70s. A weak upper level trough and cooler temperatures are favored this weekend. 29 Marine A strong area of high pressure will remain offshore throughout midweek as a thermally induced low pressure expands northward along the interior coast. Northwesterly winds will prevail across the coastal waters this week. With increasing confidence, a small craft advisory has been issued for the southernmost coastal water zones this afternoon. Breezy conditions briefly expected Tuesday morning across Puget Sound, however winds should remain below small craft thresholds. The surface trough is expected to push inland on Thursday, resulting in increased onshore flow across the waters. Small craft winds are possible through the Strait of Juan de Fuca as early as Thursday evening, continuing into the weekend. Latest guidance suggests the strongest winds will be on Friday, with a 70- 85% chance of small craft winds and 25-40% chance for gales. Another strong push expected on Saturday, with a 65-80% chance for small craft winds and 15-20% chance for gales. Seas expected to remain below 10 ft for the majority of week and will trend toward 10 feet toward the weekend. Steep seas possible Tuesday evening at times over the coastal waters. 29 Fire Weather A warming and drying trend will continue across western Washington through much of the week as a high pressure ridge builds offshore and a surface thermal trough builds northward along the Pacific coast. Several days of drying and warming will drive minimum relative humidity values to near critical levels, especially in the western Cascades and Olympics where humidities may reach critical values as low as the teens to upper single digits by Wednesday and Thursday. While no significant wind or instability is expected through the week, maximum caution should be emphasized. The thermal trough will shift inland on Thursday with the arrival of a frontal system late Thursday into Friday. Some uncertainty remains over potential instability and incoming wind in combination with the movement of the thermal trough which may briefly promote fire growth. Increased onshore flow by Friday is expected to bring cooler temperatures and increased moisture with healthier humidity recoveries. In addition, north to east winds throughout the week will continue to bring in wildfire smoke from eastern Washington and British Columbia. This may cause localized impacts to fire operations at times. 15 NOAA Seattle WA Office: Watches - Warnings - Advisories WA... Air Quality Alert until 5pm PDT Wednesday for Cascades of Pierce and Lewis Counties-Cascades of Snohomish and Northern King Counties-Cascades of Southern King County- City of Seattle-Downtown Everett / Marysville Area- Eastern Kitsap County-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-Lowlands of Lewis and Southern Thurston Counties-Lowlands of Pierce and Southern King Counties- Lowlands of Western Skagit and Northwestern Snohomish Counties-Northern Hood Canal-Olympia and Southern Puget Sound-Shoreline / Lynnwood / South Everett Area-Willapa and Black Hills. PZ...Small Craft Advisory until 3am PDT Tuesday for Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm- Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm. |
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