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Forecast Discussion:
The most exciting weather of the next 10 days happens over the next 24 hours (unless you liked the down-slope gusts on Tuesday). Go out and enjoy our cold front! By this evening, the cold front has swept past us and is already down into New Mexico and parts unknown (Figure 1). According to NCEP, up-slope flow will be strong enough early Thursday AM to give us some sleet/snow mix (Figure 2).
Weatherunderground shows the cold front passing Longmont around 1 PM with a dip in the pressure field and a steady temperature decline after that time (Figure 3). BUT they have no precipitation at all, just a bunch of north wind is howling by, according to that source.
Figure 4 is the GFS and it has a coating to an inch of snow for Boulder, but no snow to a coating of snow possible for Longmont. Figure 5, the NAM, doesn't paint any snow in NE Boulder county either.
The longer range forecast:
Back to Figure 3- you'll see that day time temperatures rapidly return to mid to upper 50's F with lows at or above freezing off to the end of Fall 12/20. Christmas is almost in sight on this model and there are no big snow storms or cold air expected. WeatherBell is still calling for a big cold spell just before Christmas - a well placed low or front could 'still' give us snow. All hope is not yet lost. More later!
