Barometric Pressure Forecast for Richland, Washington
Barometric pressure forecast for Richland, Washington — at the confluence of the Yakima and Columbia rivers in the Columbia Basin desert. See current barometric pressure and what it means for weather-sensitive people.
Download Pressure Pal to track barometric pressure and get migraine alerts for Richland and your area.
Pressure and weather in Richland
Richland sits at about 400 feet where the Yakima River joins the Columbia, in the deepest part of the Columbia Basin and in the rain shadow of both the Cascades and the Olympics. It receives around seven inches of rain a year, less than Phoenix, because Pacific fronts wring themselves dry crossing the mountains and arrive over the Tri-Cities as little more than a wind shift and a modest pressure signature. The barometric year is therefore quieter than the latitude suggests, with winter frontal passages usually bringing falls of eight to fourteen hPa rather than the twenty-plus seen on the coast. What Richland has instead is the inversion. Cold dense air pools in the basin under winter high pressure and sits there for days or weeks, holding fog and haze against the ground while the barometer stays high and motionless. Those stagnant spells end abruptly when a front finally has enough strength to scour the basin out, and the change in air quality, humidity and wind can be far more noticeable than the pressure change itself. Summer is hot, dry and almost barometrically featureless, with thunderstorms confined to the occasional outbreak drifting off the Blue Mountains to the east.
What this means for you
Long inversions mean the barometer can sit flat for a fortnight while air quality steadily worsens. Logging haze and humidity alongside pressure in a migraine tracker app captures what a pressure reading here leaves out.