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A recent study at McGill University provides new insights into how winter storms develop in the St. Lawrence River Valley, findings that could potentially improve the accuracy of winter weather forecasts in the region.

"These findings are essential because even small temperature shifts, as little as one degree, can drastically change the type of precipitation, turning rain into freezing rain or snow," said Juliann Wray, lead author and Ph.D. student in the Department of Atmospheric and Oceanic Sciences. "This has huge implications for public safety, especially during winter storms."

The study makes use of data collected for the WINTRE-MIX (Winter Precipitation Type Research Multi-scale Experiment) field program in 2022 at stations across northern Vermont and Southern Quebec, including at the state-of-the-art Earth Observing System lab at McGill's Gault Nature Reserve.

The research focused on identifying key features of weather fronts in the St. Lawrence River Valley and understanding how they influence precipitation types and amounts.

Researchers observed that the region's unique terrain contributed to an increase in local precipitation.

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