Barometric Pressure Forecast for Mount Vista, Washington
Barometric pressure forecast for Mount Vista, Washington — in Clark County north of Vancouver, on the Columbia lowlands at the northern edge of the Portland metro area. See current barometric pressure and what it means for weather-sensitive people.
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Pressure and weather in Mount Vista
Mount Vista sits at about 300 feet on the low hills east of the Columbia River, with the Cascade foothills rising to the east and the Coast Range between here and the Pacific. From October through April the region is under a near-continuous parade of Pacific frontal systems, and the strongest of them, the atmospheric rivers that come ashore aimed at the Oregon and Washington coast, take the barometer down fifteen to twenty-five hPa across a day, sometimes more when a deep low tracks up the coast. What sets this location apart from the rest of the Pacific Northwest is the Columbia River Gorge, whose entrance lies just to the east. The Gorge is the only sea-level gap through the Cascade range, and when high pressure builds over the cold interior Columbia Basin while a low sits offshore, the pressure difference across the mountains drives a strong easterly gap flow straight out of the Gorge and across the Vancouver and Portland area. That gradient is a pressure story in the most literal sense, and in winter it is what turns an ordinary rain event into the freezing-rain episodes the area is known for, as mild Pacific air overruns the cold easterly wedge. Summers are dry and settled with very little barometric movement.
What this means for you
The Gorge east-wind gradient is a local pressure pattern you will not find on a national map. Watching the barometric pressure forecast through a winter easterly event is worth doing here.