Dry conditions will prevail with the exception of some Cascade convection and temperatures will be near normal. The arrival of the trough will also bring some instability to the North Cascades with daytime heating for a slight chance of thunder.Ī mean upper trough will settle over the region this weekend. Fire weather concerns (discussed below) will begin to ease as the seepage of marine air brings better RH recoveries.Ī weak upper trough will begin to settle southward from British Columbia on Friday with temperatures dropping back to near seasonal norms and morning clouds likely for most of the lowlands. This will also herald further cooling for the coast and knock around 10 degrees off Thursdays high temperatures for much of the interior. This will bring a more solid marine layer to coastal areas on Thursday morning and perhaps extending at least part way inland. As the thermal trough shifts toward the Cascades Wednesday evening, this will initiate a bit more of a shallow marine push. HRRR integrated smoke runs show the smoke beginning to thin somewhat on Wednesday as northwesterly flow aloft gives it a nudge eastward.Ī weak ripple in the aforementioned northwest flow aloft may trigger some elevated convection near the crest of the North Cascades, but, as of this writing, the better potential will be eastward. The coast will be noticeably cooler on Wednesday.likely by some 10 to 20 degrees. The surface thermal trough will remain in place over the Puget Sound lowlands on Wednesday with temperatures rising another degree or two over todays readings. Skies will remain hazy into this evening as smoke aloft drifts down from Canada. As for interior areas, well above normal temperatures continue with locations away from the water reaching the 80s to lower 90s. The thermally induced surface trough responsible for this will begin to shift inland this afternoon.allowing a sea breeze to cool the immediate coastline. The low level flow is weakly offshore.allowing even coastal sites to warm into the lower 80s as of midday. Warm and dry conditions continue across Western Washington this 4th of July afternoon as the region remains on the periphery of a strong upper ridge centered offshore. Dry conditions will prevail except for a chance of showers and thunderstorms across the North Cascades with the upper trough late this week. Temperatures peak across interior areas Wednesday before cooling to near normal this weekend as a weak upper trough arrives. ![]() ![]() ![]() Area Forecast Discussion National Weather Service Seattle WA 300 PM PDT Tue Jul 4 2023ĭry and warm conditions continue across Western Washington as high pressure remains over the region, maintaining heightened fire weather concerns.
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