Low level onshore flow will bring some marine air inland today resulting in high temperatures nearly 15 degrees cooler than wednesday. There will also be an increase in cloud cover, especially along the coast. A front will bring light rain and breezy to windy conditions to the area later friday into friday night. Showers and cool conditions are expected on saturday. After a dry day on sunday, another front will move northeast across the area on monday.
Areas from about seattle southward in the interior and along the coast are seeing the effects of a shallow marine layer this morning. Winds are more west to southwest, temperatures are mainly in the 40s to lower 50s, and some stratus is being seen along the coast and in the chehalis gap west of shelton. Conditions from about everett northward in the interior is seeing the last gasps of dry northeasterly flow with exposed locations in the mid 50s and dewpoint temperatures mainly in the 20s to mid 30s. The marine air will continue to move northward today, but it will not be deep enough to provide any cloud to the interior north of seattle. Mid and high level clouds will spread into the area from the southeast as an upper level low moves inland to the south of the area. Highs today will be quite a bit cooler than what we saw on wednesday with highs in the lower to mid 60s in most of the interior and only in the upper 50s on the coast.
Clouds will develop and spread into the area from the south and southwest tonight as the marine layer deepens. Lows tonight will be more uniform than what we have seen recently with mainly 40s across the region.
Clouds will thicken from the south on friday with rain spreading ne across the area during mainly the afternoon and overnight hours. Light offshore flow may result in high temperatures reaching around 60 on friday before the rain starts.
The combination of a weak upper level trough and onshore flow will give a cool and showery day to the area on saturday with temperatures near normal for late march. Albrecht
Forecasts for sunday will continue to favor the more consistent and drier ecmwf model today that shows a weak upper trough moving ne of the area sunday afternoon and low level flow becoming offshore. Current thinking is that forecast highs on sunday will be in the 50s to around 60. Another nw/se oriented front will lift northeast across the area later monday or monday night as high pressure remains over the canadian prairies and a strong jet stream pushes systems mainly into california. The remainder of the period during the early to middle part of next week will see clouds and a chance of showers as systems rotate around a trough to the south of the area and get blocked from moving off to the north by high pressure over western canada. The extended forecast represents a model blend today. Albrecht
River flooding is unlikely over the next seven days.
Wa...none. Pz...small craft advisory until 11 am pdt this morning for coastal waters from cape flattery to james island 10 to 60 nm- coastal waters from cape flattery to james island out 10 nm- coastal waters from james island to point grenville 10 to 60 nm-coastal waters from james island to point grenville out 10 nm-coastal waters from point grenville to cape shoalwater 10 to 60 nm-coastal waters from point grenville to cape shoalwater out 10 nm.
Southerly flow over the coastal waters will support small craft advisory conditions this morning, with developing onshore flow through the strait. Winds and seas will ease tonight ahead of a frontal system that will move into area waters friday bringing strengthening southerlies and significant westerly swell, 10 to 12 feet, friday night rising to 14 feet at 16 seconds saturday.&&
Satellite imagery reveals generally clear skies over western washington early this morning, with some mvfr stratus popping up over hqm. Aside from some passing cirrus, skies should remain fairly clear into the morning hours. Clouds will then be on the increase quickly from the south, tho should remain vfr. A stray shower would be not impossible this afternoon, especially across southern taf sites. The next frontal system will be moving towards the area tonight and into friday, providing a much better chance for showers. Winds will remain on the south side through the period at under 10 kts.
Ksea...vfr conditions with clouds increasing through the day. conditions should remain mostly dry. Winds se but will likely dance between se and sw through much of the period. Speeds under 10kts. kovacik