Barometric Pressure Forecast for Lynnwood, Washington
Barometric pressure forecast for Lynnwood, Washington — in south Snohomish County, in the heart of the Puget Sound Convergence Zone where local weather can differ block by block. See current barometric pressure and what it means for weather-sensitive people.
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Pressure and weather in Lynnwood
Lynnwood lies on the low upland between Puget Sound and Lake Washington, roughly fifteen miles north of Seattle, and it happens to sit in the belt most often affected by the Puget Sound Convergence Zone. When westerly flow splits around the Olympic Mountains and rejoins over the sound, the two branches collide in a narrow band that most commonly settles across south Snohomish County, producing sudden heavy rain, small hail or thundersnow while communities a few miles north and south stay dry. This is a mesoscale feature, so it barely registers on the barometer, which makes it a good illustration that not all difficult weather shows up in a barometric pressure forecast. The larger signal comes from the Pacific storm parade between October and March, when frontal systems arrive every few days and atmospheric rivers occasionally bring very deep lows into the region, producing rapid, pronounced falls in current barometric pressure together with wind and prolonged rain. The other winter pattern worth knowing is the Fraser River outflow, when high pressure builds in the interior of British Columbia and cold northeasterly air pours down the valley toward the northern sound, bringing the year's coldest air and a firmly rising barometer. Summers are stable and dry under the North Pacific high, with the trace nearly flat for weeks. A barometric pressure forecast here earns attention from late autumn through winter.
What this means for you
Can barometric pressure cause headaches? Western Washington offers an unusually clean contrast between the convergence zone, which is intense but nearly invisible on the barometer, and Pacific frontal systems, which are the real pressure events. Use Pressure Pal as a headache tracking app to see which of the two your symptoms actually follow, and watch pressure change today ahead of an atmospheric river.