Heavy Snowfall Warning – April 18

Environment Canada’s Official Weather Warnings
Banff National Park
6:39 AM MDT Wednesday 18 April 2007
Snowfall warning for Banff National Park continued

Heavy snow expected tonight.

A low pressure system moving through northern Idaho will bring snow to much of southwestern Alberta tonight.

The low will bring moisture laden air to the upper levels from the south, while at the surface a cold northerly flow will develop. Initially in many areas the precipitation will start as rain, but as the temperatures fall we will see the rain change to snow.

The southernmost areas – the Crowsnest Pass, Cardston and Lethbridge regions will see 10 cm of snow tonight before the snow changes back to rain on Thursday.

Elsewhere, 15 to 20 cm of snow can be expected with the snow continuing into Thursday. Also, the airmass associated with this system is quite unstable, so we could see some local snowfall accumulations in excess of 30 cm.

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