Posted: Apr 6, 2013 2:24 PM by Meteorologist Mike Heard
Updated: Apr 6, 2013 2:36 PM
Weather computer models are in much better agreement on the changing weather pattern to occur Sunday into Monday. A moist pacific storm will impact the northern Rockies and collide with colder air from Canada producing and increasing chance of snow at all levels including the valley floors.
Mountain passes will see the biggest impact from this weather pattern change Sunday night into Monday morning with periods of brief heavy snow. Winter weather highlights may be issued from local National Weather Service offices later today.
Valley snow accumulations look to be on the light side and most likely on grassy areas we could localized accumulations of 1"-2", mountain passes should see between 3"-6" of snow and some possibly a little more and others a little less.
Temperatures will drop off quickly Sunday afternoon into Monday and could fall a good 20 to 30 degrees compared to Saturday's afternoon highs. Temperatures will be cold enough into Monday for icy road ways to develop at times so caution is advised if you plan on traveling.
Next weekend (April 13/14), the GFS and EURO medium range forecast models are beginning to predict another unseasonably cool and robust low pressure system to swing into the pacific NW, Idaho and Montana. It's still a little too early for us to predict with great confidence, however, the models are predicting a return of widespread mountain snow and a mix of valley rain/snow with temperatures a good 10 to 20 degrees below normal.
I will update the local forecast tonight at 10pm after the NCAA final 4 basketball games on KXLF and KBZK.