Persistent snows through Monday

Thursday, February 6, 2014

The Steamboat ski area reported 1” mid / 2” top early this morning, and the 11am update had an additional 1” mid / 2” top falling between 5am and 11am. We currently have cold air near the surface being overrun by northwest flow contained within a moist and relatively warm branch of the polar jet. Forecast snow amounts will be tricky as two different physical processes compete. Generally, a warming airmass in the mid-levels is not conducive for significant snow accumulations as the warming increases stability and decreases relative humidity. However, this relatively warm airmass is being lifted over the cold air entrenched in the Yampa Valley, and this extra ingredient means light snow accumulations will continue. I might expect a 3-6” report by tomorrow morning.

Continued light snow should occur through Friday before an embedded wave races by to our north Friday night. This will bring some cooling to the atmosphere, increasing snowfall rates through early Saturday before the atmosphere warms again earlier in the day, likely ending snowfall for a very brief period. Snow accumulations may be in the 4-8” range by Saturday morning.

Atmospheric temperatures are then forecast to hold mostly steady through Sunday even as valleys likely warm above freezing on that day. Light snow should redevelop by Saturday afternoon and persist Sunday before another stronger wave passes over the area late Sunday or early Monday. Probably another 3-6” by Sunday morning, and 8-16” spread between the Monday and Tuesday morning reports. The timing of the Sunday night/Monday wave will be refined in later model runs and will determine whether significant snows occur early enough to be included in the Monday morning report.

Snows will likely end for a short time sometime on Tuesday before another embedded wave in the persistent northwest flow will repeat the above pattern midweek.

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15 June 2019

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