Barometric Pressure Forecast for Plymouth Meeting, Pennsylvania
Barometric pressure forecast for Plymouth Meeting, Pennsylvania — in Montgomery County above the Schuylkill River, northwest of Philadelphia. See current barometric pressure and what it means for weather-sensitive people.
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Pressure and weather in Plymouth Meeting
Plymouth Meeting sits at about 200 feet on the Piedmont uplands just north of where the Schuylkill River cuts its valley toward Philadelphia. Geographically it lies in the transition zone that makes Philadelphia-area winters so difficult to forecast: near enough to the Delaware valley and the Atlantic for warm air to be drawn in aloft, far enough up the Piedmont for cold air to hold at the surface. The consequence is that freezing rain and sleet make up a larger share of winter precipitation here than either in the city or up in the Poconos, and the difference between a manageable evening and a regional shutdown can come down to a two-degree change in a layer a few thousand feet overhead. Nor'easters supply the deepest falls, twenty-five to thirty-five hPa across a day and a half, followed by a sharp rise and a northwest gale. The Schuylkill itself is the flood concern, draining a long basin down from the coal region, and a tropical remnant parked over eastern Pennsylvania, Ida in 2021 being the recent example, sends it far out of its banks through the boroughs a few miles downstream. Summers are humid, with a nearly flat barometer and thunderstorms arriving on sea-breeze and frontal boundaries rather than on any pressure signal.
What this means for you
The storms that move the barometer most here often arrive as ice rather than snow, which changes what preparing for them means. The barometric pressure forecast flags the system a day or two before the precipitation type is settled.