Mid-week cooldown with overnight temperatures around freezing

The next two days will be cooler for much of the Prairies, including Alberta. Both daytime highs and overnight lows will be slightly below seasonal for most of southern Alberta, with early morning temperatures at or below freezing in many communities. The main weather-maker for most of the country is a potent low pressure system parked over Hudson Bay. That low is drawing cooling air from the north and filtering it back toward the west coast. In the southeastern Pacific a high pressure system is