SAN JUAN MOUNTAINS WEATHER FORECAST, MONDAY, 12/17/12

NW flow is carrying moisture across the forecast area with occasional snow flurries that favor the northern and central Colorado mountains today/tonight and to a lesser degree the San Juans.  A strong jet is pushing ridge top winds today then will die down tonight.   A short lived ridge of high pressure is currently over the Great Basin and tonight the flow shifts to zonal (westerly) flow.

Early Tuesday morning the flow shifts southwest as a significant trough of low pressure along the California coast moves on shore and should arrive in our mountains late Tuesday night.    A cold front will collide with the Pacific trough to create short lived (approximately 12 hr.) period of intense precipitation as it moves over western Colorado early Wednesday morning.  The NWS states, “HEAVY SNOWFALL RATES WILL BE EYE POPPING. THIS IS A RARE DECEMBER STORM FOR THE WESTERN SLOPE”.  If future models stay on track it looks like a good storm period for the San Juan Mountains.  SW aspects (11,000′ & above) will be favored and could see up to 20″ of snow.

High pressure returns on Thursday with storm passage, clearing skies and very cold temperatures.

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