Barometric Pressure Forecast for Jonesborough, Tennessee
Barometric pressure forecast for Jonesborough, Tennessee — Tennessee's oldest town, in the Great Appalachian Valley where cold air dams against the Blue Ridge for days. See current barometric pressure and what it means for weather-sensitive people.
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Pressure and weather in Jonesborough
Jonesborough lies in Washington County in the Tri-Cities region, set in the ridge-and-valley country of the Great Appalachian Valley with the Blue Ridge and Unaka mountains rising to the southeast and the Cumberland Plateau beyond to the northwest. That corridor position produces one of the most distinctive weather patterns in the eastern United States: cold air damming. When high pressure builds over the northeast and low-level cold air is funnelled southwest down the valley, it becomes trapped against the eastern slopes of the mountains while milder air overruns it aloft. The result is a stubborn, grey, drizzly regime that can persist for two or three days, with barometric pressure running higher than the wet conditions would suggest and changing only gradually. In winter these wedge events are the main freezing-rain risk. The mountains also cast a partial rain shadow, so annual totals in the valley are lower than on the windward slopes a few miles east. The remains of Gulf tropical systems occasionally track north into the southern Appalachians in late summer, forcing air up the terrain and producing both the heaviest rainfall and the lowest current barometric pressure readings of the year. A barometric pressure forecast here matters most through the cold season.
What this means for you
Can barometric pressure cause headaches? Upper East Tennessee is a good example of why the raw number can mislead: during a cold air damming event the weather feels oppressive for days while the barometer stays relatively high and flat. Use the barometric pressure forecast in Pressure Pal as a migraine tracker app, log the wedge days as their own category, and watch pressure change today when the pattern finally breaks down.