12:15 PM, Sunday, December 28, 2014
The final three days of 2014 will be very cold, mainly cloudy, and with snow (at least Mon-Tue). This is due to a storm system from the west and a strong arctic cold front from the north.
The cold front should move south through Wyoming overnight and southward through Colorado’s Front Range Monday morning, probably before daybreak in Denver and points north. Early morning temperatures on Monday are likely to be in the teens in the Denver to Fort Collins corridor and on the way down through the single digits in the afternoon and to around zero by nightfall. It may take a few hours longer from Colorado Springs and points south, but the day will turn very cold there too. On Tuesday, temperatures are likely to start in the -1 to -10 range and barely climb above zero during the day before falling to the -1 to -10 range Tuesday night (maybe around -15 in some valley areas and DIA). Wednesday is likely to see temperatures rise to the low 20s. We may even break the freezing mark on New Years Day.
Clouds and Snow:
Low stratus is likely to develop behind the cold front Monday morning and then it is expected to be mainly cloudy into Tuesday night. The clouds might thin a little at times in the high elevations on Tuesday. Periods of snow and ice crystals are likely Monday morning through Tuesday evening. During the period we are likely to see 3-6 inches, with 6-9 inches possible in the foothills and Palmer Divide area. The best chance for a period of moderate or heavy intensity snow along the Front Range is Monday afternoon and/or night, but most of the snowfall should be light. Mountain areas in western Colorado are likely to see 6-12 inches beginning today. The final remnant of the storm is probably going to pass south of Colorado on Thu-Fri and may bring more clouds and snow to the San Juans and/or Sangre deCristo ranges.
The record lows for Tue and Wed morning in Denver are -11 and -19, and in Boulder they are -11 and -18. There is a small chance we will reach the Tue record, but very little chance for the Wed record. The record lowest maximum temperature on Tue is +8 for Denver and +16 for Boulder. Both are likely to fall, and Boulder’s may get clobbered.