Barometric Pressure Forecast for Tumwater, Washington
Barometric pressure forecast for Tumwater, Washington — at the falls of the Deschutes River at the southern end of Puget Sound. See current barometric pressure and what it means for weather-sensitive people.
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Pressure and weather in Tumwater
Tumwater sits where the Deschutes River drops over a series of falls into Budd Inlet, at the very southern end of Puget Sound and immediately south of Olympia. This corner of the Sound is one of the wettest parts of the lowland, well clear of the Olympic rain shadow that keeps the northeastern Peninsula dry and south of the convergence zone that concentrates rain further up the Sound. From October to March a near-continuous procession of Pacific frontal systems crosses the coast, and each one brings a recognisable sequence: a falling barometer with thickening cloud and southerly wind, steady rain as the front passes, then a wind shift to the southwest and a rising trace with showers behind it. Deep lows crossing to the north occasionally bring damaging wind rather than rain, and the strongest of them produce the region's sharpest falls. Summer is the other extreme, with the North Pacific High offshore, rainfall close to nothing for weeks and a trace so flat that the daily heating cycle becomes visible on it.
What this means for you
Winter here brings a recognisable repeating sequence rather than isolated events, with a new system every few days. A barometric pressure forecast covering the whole week shows that rhythm better than any single day's reading.