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Cooler and wetter than normal outlook for late October

Posted: Oct 11, 2012 2:28 PM by Meteorologist Mike Heard
Updated: Oct 11, 2012 3:53 PM

8 to 14 day temperature outlook
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Climate Prediction Center's 8 to 14 day outlook looks wintry from October 19th to the 25th. As the attached graphic shows we have a 30% to 40% chance of seeing below normal temperatures and above normal precipitation.

Beginning this weekend a blocking high pressure ridge over the pacific NW and western Canada will finally collapse and a very active polar jet stream will move through the pacific NW and northern Rockies. Numerous storm systems will follow the upper level jet and some of these storms are packing abundant moisture as a few of them are degraded typhoons from the western pacific that will travel back across the pacific ocean into the pacific NW.

The combination of a good healthy stream of storms moving in from the west and cooler Canadian air dropping down from the north late next week through the 4th week of October will most likely bring accumulating mountain snow to Montana and possibly to the valley floors as well.

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