Barometric Pressure Forecast for Rolla, Missouri
Barometric pressure forecast for Rolla, Missouri — on the dissected Ozark uplands between the Gasconade and Meramec rivers. See current barometric pressure and what it means for weather-sensitive people.
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Pressure and weather in Rolla
Rolla stands at about 1,100 feet on the Salem Plateau, on a narrow spine of high ground with the Gasconade valley to the west and the headwaters of the Meramec to the east. The surrounding country is deeply cut karst, riddled with caves and springs, and the terrain produces a pronounced split between ridge weather and valley weather. On calm nights the hollows below town can be ten degrees colder than the ridge, filling with fog that does not clear until mid-morning while the plateau stays bright. Rolla's barometric year is dominated by its position on the winter precipitation boundary. Systems tracking along the Ohio Valley put the town in the uncertain zone where a hundred-mile shift in track changes the outcome from rain to sleet to a foot of snow, and the pressure trace is often the clearest early signal of which way it will go. Spring brings Plains lows with falls of twenty to twenty-six hPa and severe storms that weaken slightly as they cross the rough Ozark terrain. Summer sits under a persistent ridge, hot and humid with a flat barometer, punctuated by storm complexes that arrive overnight from the northwest and stall against the plateau.
What this means for you
Ridge and valley differ enough here that two people a mile apart can have very different mornings. The barometric pressure forecast is identical for both, but where you sleep decides how the morning actually feels.