Barometric Pressure Forecast for Thorold, Canada
Barometric pressure forecast for Thorold, Canada — on the Niagara Escarpment beside the Welland Canal. See current barometric pressure and what it means for weather-sensitive people.
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Pressure and weather in Thorold
Thorold sits astride the Niagara Escarpment, the limestone ridge that carries the Niagara River over its falls, with the Welland Canal climbing through the town by lock between Lake Ontario and Lake Erie. Two lakes and one ridge explain the local weather. Lake Erie is shallow and warms and cools quickly, so from November until it freezes it feeds intense snow squalls onto any westerly or northwesterly flow, and the escarpment forces that air upward as it crosses the peninsula, concentrating the heaviest bands on and just above the ridge. Below the escarpment, Lake Ontario moderates the growing season enough to support the region's fruit and wine industry, delaying spring bud break and holding off autumn frost. The deeper pressure falls come from Colorado and Texas lows tracking up the Ohio Valley, which often place the area on the rain and snow boundary. Summer brings humid southwesterly flow with lake breezes advancing from both directions and converging over the middle of the peninsula to trigger afternoon storms.
What this means for you
Squall snow here comes on a rising barometer behind a cold front, while the biggest falls arrive with milder storms from the southwest. A barometric pressure forecast describes the second pattern well and the first hardly at all.