Barometric Pressure Forecast for Harleysville, Pennsylvania
Barometric pressure forecast for Harleysville, Pennsylvania — in upper Montgomery County in the Perkiomen headwaters, on the Piedmont north-west of Philadelphia. See current barometric pressure and what it means for weather-sensitive people.
Download Pressure Pal to track barometric pressure and get migraine alerts for Harleysville and your area.
Pressure and weather in Harleysville
Harleysville lies on the gently rolling Piedmont in the headwaters country of the Perkiomen, about thirty miles inland from Philadelphia and high enough above the Delaware valley to hold snow when the city gets rain. That elevation difference is small but it matters several times each winter, and it puts the town on the cold side of the rain-snow line more often than not. Coastal storms running up from the Carolinas bring the deepest pressure falls of the year, mainly from January through mid March, and they can deliver a foot of snow here while the airport tallies an inch of rain. The other period worth watching is late summer, when the remnants of tropical systems drift north and stall over the Piedmont. Those events have produced the worst flooding the Perkiomen and Schuylkill have seen, and they show up as very long, shallow declines lasting well over a day rather than the sharp drop of a winter storm.
What this means for you
Slow tropical declines and fast nor'easter drops affect people differently. A migraine tracker app that logs automatically will show you which pattern is actually yours.