San Juan Islands and Northern Inland Waters Marine Forecast
Today...N Wind 5 To 15 Kt Becoming Nw In The Afternoon. Wind Waves 2 Ft Or Less. |
Tonight...Nw Wind To 10 Kt Becoming S After Midnight. Wind Waves 2 Ft Or Less. |
Wed...S Wind 5 To 15 Kt Becoming To 10 Kt In The Afternoon. Wind Waves 2 Ft Or Less. |
Wed Night...S Wind To 10 Kt. Wind Waves 1 Ft Or Less. |
Thu...Se Wind To 10 Kt. Wind Waves 1 Ft Or Less. |
Thu Night...E Wind To 10 Kt. Wind Waves 1 Ft Or Less. |
Fri...Ne Wind To 10 Kt. Wind Waves 1 Ft Or Less. |
Sat...Ne Wind To 10 Kt. Wind Waves 1 Ft Or Less. |
Area Forecast Discussion National Weather Service Seattle WA 247am PDT Tuesday Mar 19 2024 Synopsis A weakening upper level ridge will provide one more dry and mild day for Western Washington on Tuesday. A weak upper trough will produce some light precipitation across the region later Wednesday into Thursday. A deeper trough and associated frontal system will produce more widespread precipitation Friday into the weekend along with snow levels falling to many of the passes. Short Term - Today through Thursday Mostly clear skies prevail across Western Washington early this morning as upper ridging remains in control. The only exception is a shallow marine layer along the central coast. Similar temperatures to Monday are expected across interior areas today, but increasing onshore flow will produce several degrees of cooling along the coast. The ridge will weaken and shift eastward tonight as a weak upper trough approaches the area. Clouds will increase and temperatures will cool several degrees on Wednesday, but little in the way of Quantitative Precipitation Forecast is expected until Wednesday night when the trough shifts onshore. A frontal system stalling offshore will spread additional light precipitation across Western Washington on Thursday along with continued cooler temperatures. Long Term - Friday Through Monday More significant precipitation is expected to spread across the area on Friday as a deepening upper offshore pushes a front onshore. Showery and cool weather is expected over the upcoming weekend as the trough gradually shifts onshore. Snow levels will creep downward as well...likely to most of the passes by Saturday night into Sunday. Unsettled conditions are likely to continue into the early part of next week, but confidence is low in the details. Ensemble means place the region in northwest flow aloft Sunday into Monday as broad upper troughing takes up residence over the western lower 48. This leaves Western Washington susceptible to a system or two slipping southward down the British Columbia coast. One thing is for sure, the unseasonably mild and dry conditions aren't returning anytime soon. 27 Marine Onshore flow along with weak troughing at the surface. Relatively benign conditions are expected today before a weak low center enters tomorrow. However, no impacts are expected with sub- advisory conditions likely. Seas less than 10 feet through the week, mainly in the 3-6 ft range. A weakening front is probable to arrive over the weekend with the next best chance of SCA (Small Craft Advisory) winds over the coastal waters. McMillian Hydrology No river flooding is expected over the next 7 days. NOAA Seattle WA Office: Watches - Warnings - Advisories WA...None. PZ...None. |