![]() ![]() Light winds becoming more southerly into the afternoon. Mostly dry today with brief rain showers in the area. Brief period of MVFR cigs possible this morning, with the best potential south of KSEA (generally 14- 18z). Light winds this morning become south through the afternoon. Cigs mainly VFR this afternoon/evening with brief rain showers possible. There may also be fog development near KOLM/KPWT into the morning, however low/mid cloud deck should limit any widespread fog. VFR will continue for most through the morning, however, MVFR/IFR cigs will be briefly possible, particularly for KOLM, KHQM, and KPWT, but also KSEA/KBFI. VFR for much of the area early this morning with mainly dry conditions. Troughing will remain offshore through today for generally light southerly flow aloft. This system is weaker and a little cooler with snow levels dropping back down below the passes. Another system will be right on its' heels for Tuesday. This system has a little bit of a sub tropical tap so when it moves inland Monday it will bring heavier rain/snow to the Olympics with the highest snow levels we have seen in awhile, as high as 4500 feet. Upper level low continuing to dig south Sunday stalling a front offshore with a better chance for rain along the coast than over the interior. Another system trying to move into Western Washington Saturday but with yet another cold upper level low beginning its' track south the flow aloft becomes southwesterly pushing most of the system to the northwest of the area. Extended models have been consistent in the last few days with zonal flow aloft behind the front. Easterly gap winds in the Cascade foothills will come to an end with the front moving through the area in the afternoon. Upper level low and associated front moving through Western Washington Friday with rain in the lowlands and snow, 6 to 12 inches, in the mountains. ![]() Plenty of cloud cover will keep lows a little warmer, in the mid 30s to lower 40s. Front associated with the low also just offshore by 12z Friday with rain along the coast and rain likely inland. As the surface low approaches easterly gradients will increase with breezy conditions in the Cascade foothills, gusts to 40 mph, due to gap winds. ![]() Surface low a little out ahead of the upper feature. Upper level low continuing to move east Thursday night with the low near the coast by 12z Friday. Snow levels will rise in the afternoon up to 1500-2000 feet making the shower activity just rain in the lowlands. Upper level low will slowly drift east Thursday remaining well offshore but close enough to keep showers in the forecast. When the precipitation arrives dew points will initially be lower than we have seen for the last few days bringing up the possibility of a rain snow mix down to about 500 feet early Thursday morning. This will dry and cool the lower levels of the air mass overnight. Low level flow turning easterly in response to the offshore low. First band of moisture spinning out of this feature will move over the area later tonight. Another upper level low moving down from the north will be about 300 miles offshore tonight. Scattered showers ending in the evening hours as the air mass stabilizes again after dark. As has been the case for the last few days less cloud cover in the morning hours with a little bit of sunshine. This will destabilize the air mass once again with scattered showers developing by mid afternoon. The low off the Oregon coast will weaken into an open trough and move through Western Washington this afternoon. The parade of upper level lows continuing through Friday. A few breaks in the cloud over has allowed temperatures to drop below freezing in many locations with the remainder of the area in the mid 30s at 3 am/11z. Band of showers moving northwest and rotating around the low over the Southwest Interior. Satellite imagery shows a weak upper level low just off the Central Oregon coast early this morning. The next system spinning out of yet another upper level low will arrive Sunday night into Monday. A much weaker system will approach the coast Saturday but remain offshore. The low will slowly drift east Thursday and Thursday night before the low and the associated front move through the area Friday. Another upper level low will move south off the British Columbia coast ending up about 300 miles offshore tonight. Weak upper level low off the Oregon coast will dissipate this morning. Area Discussion for - Seattle, WA (on/off) Help NOTE: mouseover dotted underlined text for definitionĪrea Forecast Discussion National Weather Service Seattle WA 359 AM PST Wed Mar 8 2023 ![]()
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