Barometric Pressure Forecast for Hagerstown, Maryland
Barometric pressure forecast for Hagerstown, Maryland — in the Cumberland Valley between South Mountain and the Allegheny Front, in the state's western panhandle. See current barometric pressure and what it means for weather-sensitive people.
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Pressure and weather in Hagerstown
Hagerstown sits on the broad limestone floor of the Cumberland Valley, hemmed in by South Mountain to the east and the Allegheny Front rising to the west. Being in a valley between two ridges gives the town a climate distinctly different from the Maryland most people picture: colder in winter, snowier than the Baltimore area by a wide margin, and noticeably drier in summer when west winds descend from the Alleghenies and wring the moisture out. Winter is the season that matters, from December through March, when coastal storms tracking up the eastern seaboard drag moisture over the mountains while cold air pools on the valley floor, producing prolonged snow and sometimes freezing rain. Those systems bring the year's largest pressure falls, often extended over a day and a half. Summer thunderstorms usually form over the Alleghenies and roll down into the valley in the late afternoon, weakening as they come.
What this means for you
Cold air pooling in the valley can keep conditions unsettled long after a system has passed to the east. Tracking the current barometric pressure locally beats relying on a Baltimore or Washington reading.