Farmers’ Almanac Canada: Winter weather forecast [Video]

A whirlwind of rain and snow will blanket most of Canada this winter thanks in part to the La Nina weather pattern, according to the Farmers’ Almanac’s new extended weather forecast.

From east of the Rockies to Ontario, about two-thirds of Canada are projected to have below-normal temperatures as the La Nina system is forecast to develop throughout the season, according to the Farmers’ Almanac, an online and print weather-forecasting publication based in Lewiston, Maine.

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La Ninais a naturally occurring phenomenon that typically happens every three to five years, according to the National Oceanic and Atmospheric Administration. With La Nina, the interactions between the ocean surface and atmosphere make the tropical Pacific Ocean colder than normal. The changes affect tropical rainfall patterns and atmospheric winds over the ocean, which ultimately alter weather patterns around the world. While it usually forms during March to June, La Nina …