Barometric Pressure Forecast for Bala Cynwyd, Pennsylvania
Barometric pressure forecast for Bala Cynwyd, Pennsylvania — on the Main Line just above the Schuylkill, at the edge of Philadelphia. Check current barometric pressure and what it means for weather-sensitive people.
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Pressure and weather in Bala Cynwyd
Bala Cynwyd sits on the first rise of the Main Line, immediately across the Schuylkill River from Philadelphia, on the Piedmont side of the fall line. Its weather is mid-Atlantic in the fullest sense: close enough to the coast that ocean storms dominate the winter, far enough inland that the ocean does little to moderate the temperature. Nor'easters are the signature event. These coastal lows track up from the Carolinas, intensify off the Delmarva and produce the deepest and longest pressure falls of the year, sometimes forty-eight hours of steady decline before the centre passes. A small difference in the track decides whether the borough sees rain, snow or the sleet-and-freezing-rain mixture that the area gets so often, because the Schuylkill valley and the ridge above it sit right where warm air aloft overruns cold air at the surface. Summer flips the pattern entirely. The Bermuda high pumps humid air up the seaboard, the barometer flattens, and heat and humidity build for days until a cold front finally breaks it with a line of thunderstorms and a sharp rise behind.
What this means for you
The nor'easter is the pressure event that matters most here, and its defining feature is duration rather than depth — a long, grinding fall rather than a quick one. A barometric pressure forecast showing the multi-day trend gives you a day or more of warning, which is usually enough to move the things that can be moved.