Cape Flattery to Cape Shoalwater WA between 150 and 250 NM Offshore Forecast
| Tonight...Variable Winds Less Than 10 Kt. Seas 5 To 7 Ft. |
| Sat...Variable Winds Less Than 5 Kt. Seas 5 To 6 Ft. |
| Sat Night...W To Nw Winds Less Than 10 Kt. Seas 5 To 6 Ft. |
| Sun...W To Nw Winds Less Than 10 Kt. Seas 5 To 6 Ft. |
| Sun Night...N To Nw Winds 5 To 15 Kt, Becoming Nw 5 To 10 Kt. Seas 5 To 6 Ft. |
| Mon...Nw Winds 5 To 15 Kt. Seas 5 To 6 Ft. |
| Mon Night...N To Nw Winds 5 To 15 Kt. Seas 5 To 6 Ft. |
| Tue...N Winds 10 To 15 Kt. Seas 5 To 6 Ft. |
| Tue Night...N Winds 15 To 20 Kt. Seas 6 To 7 Ft. |
| Wed...N Winds 10 To 20 Kt. Seas 6 To 8 Ft. |
| Wed Night...Nw Winds 10 To 15 Kt. Seas 6 To 8 Ft. |
| Area Forecast Discussion National Weather Service Seattle WA 854am PDT Fri September 4 2026 Synopsis Upper level low along the Central Oregon coast this morning will hardly move through Saturday morning. The low will drift north over Western Washington Saturday afternoon and remain in the vicinity until moving east Sunday night into Monday morning. Dry northwesterly flow aloft later Monday into Tuesday. A weak system will brush the area Thursday. Short Term - Today through Sunday The surface low remains nearly stationary just off the coast of Newport, Oregon, with scattered showers continuing to spin around the low this morning as moisture continues to filter in from the southeast. Off and on showers through the morning will continue, as the air mass becomes unstable in the afternoon from solar heating, allowing showers and isolated thunderstorms to develop over the higher terrain. Light east southeasterly flow aloft will try and push the showers into the lowlands late this afternoon into the evening hours. Winds at 700 mb and 500 mb 10 knots or less will make it hard for the showers to get all the way to the Puget Sound with storm motions only 15 kt or less. With the light flow aloft any convection that does form has the potential to produce at least a brief heavy downpour with the cells moving slowly. Shower activity drying up in the evening hours with mostly cloudy skies overnight. A little bit of sun today pushing highs in the 60s and lower 70s. Lows tonight in the mid 40s to mid 50s. Low starts to drift north Saturday morning ending up over Western Washington Saturday afternoon. Like today, showers developing over the higher terrain by late morning will try and float down into the lowlands in the afternoon and early evening hours. Light flow aloft continuing with the low overhead making it most likely the convection over the Cascades only gets to the Cascade foothills with the activity over the Olympics not getting all the way to the ocean. Showers dissipating in the evening with partly cloudy skies into Sunday morning. Persistence a good forecast for the temperatures Saturday and Saturday night. Highs maybe a couple of degrees warmer than Friday. Low weakening but remaining in the vicinity Sunday. Could still see a shower over the Cascades especially the South Cascades in the afternoon otherwise just partly cloudy skies. Highs in the Long Term - Sunday Night Through Thursday Model solutions have been in good agreement for a few runs that the low kicks out to the east Sunday night and Monday. Dry northwesterly flow aloft developing over the area Monday will continue into Tuesday. Western Washington in a lull Wednesday with a weak upper level low developing well to the southwest and a weak system starting to slide down the British Columbia coast. System brushing the area Thursday for a slight chance of showers. Temperatures near normal through the period with mostly sunny days and partly cloudy nights. Highs upper 60s to mid Marine Marine forecast remains uneventful as winds and seas remain below any sort of headline criteria. Broad low pressure remains in place, with showers and a few thunderstorms possible again today, which could bring isolated gusty outflow winds. Otherwise, northerly winds develop over the waters Saturday through the start of next week. A marginal westerly push through the Strait of Juan de Fuca around Monday looks to be the next potential period of advisory strength conditions. Seas currently 4 to 6 ft, expected to ease just a little more this afternoon, down to 3 to 5 kt...and will remain there through the first half of next week. 18 NOAA Seattle WA Office: Watches - Warnings - Advisories WA...None. PZ...None. |
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