Real-time probability that schools in Erie, Pennsylvania will be cancelled tomorrow, based on live forecast data and local closure thresholds.
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12+ inches of lake-effect accumulation
Erie sits inside one of the most intense lake-effect snow belts in North America. Localized accumulation can exceed a foot in a single band while adjacent neighborhoods stay dry, which makes forecasting for Erie uniquely difficult. Schools here rarely close for the 3–6 inch storms that shut down southern cities, but 12-inch lake-effect bands parked directly over a bus route force a same-day closure call.
Lake-effect snow is fundamentally different from synoptic-scale snow. It forms when cold air crosses warm lake water, picks up moisture, and dumps it in narrow convective bands downwind of the shoreline. In Erie, that means a band might produce 24 inches in six hours on the south side while the airport — where the official observation is taken — reports only flurries. District administrators rely on first-person bus-route reports and township-level snowfall observers to make calls, because the airport number alone understates what kids actually face.
The timing also differs. Lake-effect bands often develop after midnight and dissipate by mid-morning — meaning the worst snow of the day has already fallen by the time the 5am closure call is made. That makes Erie district decisions more reactive than proactive: closures are called during the event, not the day before.
Erie averages 101 inches of snow per winter — most of it from lake-effect events rather than large synoptic storms. Total snowfall is among the highest of any US city, but the pattern is many smaller events rather than a few large ones.
Because lake-effect bands are hyper-local, SnowSense™ pulls forecast data for Erie's exact coordinates — not the nearest airport. Live probability refreshes every 30 minutes.
Pennsylvania · 307 words of Erie-specific context
Per-district snow day probability
Live forecasts within driving distance of Erie