3:10 PM MST, Wednesday, February 24, 2021
I don’t have time for a full blog except to say that for the areas I forecasted 4-7″ in yesterday’s blog (Boulder-Broomfield, west side of Denver, Castle Rock, Colo Springs), it’s looking like the 7-inch end of that range is likely for areas along the foothills from Boulder down though the Palmer Divide, and I wouldn’t be surprised to see some local reports exceeding that amount. There will probably be a period of heavy snow between nightfall and midnight. Enjoy!
5:15 AM, Tuesday, February 23, 2021
A cold front will move through this evening making Wednesday a colder day, but not bitter cold. The snow will likely hold off until Wednesday evening, but it is possible that it will start as early as mid-late Wednesday afternoon, as a storm system moves just south of the Front Range region. Accumulations are likely to range from around 6 inches in and near the foothills, to less than an inch on the northeastern plains.
4-7″ Nederland, Boulder, Broomfield, Castle Rock, western suburbs of Denver, Colorado Springs.
2-4″ Cheyenne, Fort Collins, Longmont, eastern side of Denver.
less than 2″ for much of Weld County and east/northeast of DIA.
6AM MST, Saturday, February 20, 2021
A cold front this evening will halt the trend toward milder weather and bring some clouds and snow. The best chance for some minor accumulation (1-3″) appears to be the from Boulder and Adams County south to Douglas and northern El Paso counties. This includes Denver metro. There is less chance for accumulating snow in Larimer and Weld counties and the northern part of Boulder county.
After a colder day on Sunday, we should be in for some mild weather on Monday and Tuesday. The next chance for snow and cold is in the Wednesday-Thursday time period.
5:30 AM MST, Wednesday, February 17, 2021
The good news is that the continuation of cold weather for another two days won’t be record cold like what we experienced over the last week. Daytime temperatures are likely to be near freezing, and nighttime lows mainly in the teens through Friday morning. Both Denver and Boulder were above freezing on Tuesday, so our stretch of days below 32 ended.
Snow is likely in most parts of the Front Range region later today and tonight. Accumulation, where it occurs, is most likely between mid afternoon today and the predawn hours on Thursday. Amounts should range from a dusting on the eastern plains to 2-4 inches in and near the foothills. There will probably be some 6 inch reports in the foothills.
Temperatures are expected to return to more average levels Friday and Saturday. Then it looks like another cold front Sunday, followed by a warm up on Monday and Tuesday.
6:20 AM MST, Saturday, February 13, 2021
The coldest surge of this arctic air mass, along with a weak storm system, will move into the Front Range region later today bringing 3-5 inches of snow and the coldest weather of the season (that weak storm won’t be so weak at it moves from the southern Plains to the Northeast later this weekend). The snow for the Front Range region will be mainly from mid-afternoon today through early morning Sunday.
Sunday is looking like the coldest Valentines Day of record. The record low maximum temperatures are 14 in Boulder (1905) and 8 in Denver (1895). The thermometer may struggle just to get into the single digits in either place.
We should be close to the record lows on Sunday morning. Those are -6 in Boulder and -10 in Denver, both from 1903.
Monday morning will probably be the coldest morning under clear skies. The record in Boulder (-12 from 1903) and is within reach, but Denver’s old record (-20 from 1881) is more of a long shot.
Length of time below 32:
In Boulder, January of 1930 saw a 12-day stretch that remained below 32, the longest such stretch. At the current climate station location (since 1990) there have been three 7-day stretches below freezing: December 1990, February 2014, and December 2015. We will reach 7 days on Monday, and although it may be close to 32 on Tuesday or Wednesday, there is a chance that we will extend this stretch below freezing to 9 days. Later in the week it should warm up.
6 AM MST, Thursday, February 11, 2021
It has already been a cold week for the Front Range region, although for areas above 7000 feet, not really that cold compared to average. Friday through Monday will bring the most intense part of this cold spell, and the higher elevations will join in as well. Flurries with some minor accumulation are possible throughout, and a period of more steady accumulating snow is likely Saturday evening through midday Sunday.
At 6 AM this Thursday morning a gradient from cold to very cold lies across the northern plains and into northeastern Wyoming. That gradient will push slowly southward today and tonight. Today will be similar to the last few days, but will start trending colder from north to south this afternoon and evening.
Maximum temperatures Friday through Sunday will struggle to reach 20 in the lower foothills and plains, and on the coldest day (Sunday), temperatures may fail to reach 10. Minimum temperatures in the lower foothills and plains are likely to be 0 to 10 with some localized cold spots below zero Friday and Saturday mornings. But then widespread minimum temperatures below zero likely by Sunday and Monday mornings, with some local areas in double digits below zero on Monday morning. Although the worst of the cold should begin to let up Monday afternoon, it looks like we will continue to have below average temperatures through midweek.
Periods with clouds and flurries are possible throughout. But a distinct storm moving south of the Front Range region late Saturday and Sunday is likely to bring more organized areas snow, ending Sunday afternoon or evening. Accumulation of 3-6 inches is possible through Sunday, with most accumulation from Saturday evening through midday Sunday.
12:30 PM MST, Sunday, February 7, 2021
Today’s windy and mild temperatures will turn colder again Monday, and much colder by Friday. The eastern Colorado foothills and plains should be mainly dry until Thursday, and then the chance for some accumulating snow increases later on Thursday or Friday.
A very cold air mass is entrenched through the central United States. One only needs to drive a few hours north or east from Denver to encounter temperatures below 15 degrees this Sunday afternoon along with some low clouds, ice fog, and some light snow. A cold front by Monday morning will bring that air mass farther west toward the Front Range urban corridor. We remain on the edge, so it’s possible that Monday will be mostly sunny and seasonably cool. But I am expecting to see areas of low clouds and maybe some local areas of fog or light freezing drizzle Monday morning in the urban corridor. Cloudy areas are likely to erode away during the day, but we may see the return of some low clouds and fog from time to time through Thursday, with cold temperatures but probably not as cold as eastern Wyoming, Nebraska, and Kansas.
Late Thursday it looks like another surge of this cold air mass will move south and threatens to be a somewhat more direct hit along the Front Range, bringing very cold temperatures and at least some snow. Once in place, it may be hard to dislodge the cold air from the Front Range for the 3-day weekend coming up, but that forecast will be updated later in the week.
12:50 PM MST, Friday, February 5, 2021
It will get much colder over the next week before it gets warmer! The weather pattern has very cold air pushing southward through the Great Plains and westward to the Rockies. For now we are on the western edge, so it’s not too bad along the Front Range, but that is likely to change, especially from Monday onward.
The snow in the mountains should end by Saturday, while it remains dry in the eastern foothills and plains. A strong cold front is pushing southward into Nebraska and northeastern Wyoming at midday Friday and should move into eastern Colorado tonight. Because we are on the edge of this cold air mass, there is a chance that Saturday afternoon will be like today, but I think you should be prepared for a colder day and maybe some low clouds or freezing drizzle in the early morning.
The next cold front Sunday evening may be preceded by a little downslope warming in and along the foothills on Sunday. But don’t get used to it.
Cold weather should take hold by Monday, and will probably be followed by additional cold fronts through the week. Because the middle levels of the atmosphere are likely to be dry early in the week, little or no snow is likely at first, but I expect there may be freezing drizzle by Monday morning. (Freezing drizzle occurs when we have shallow clouds, but no ice crystals from above.) Later in the week as more moisture in the mid levels approaches, the chances for snow accumulation increases. The cold spell may extend to the next weekend, but more on that in later updates.
5:45 AM MST, Wednesday, February 3, 2021
After a mild day today a cold front is set to return the temperatures to more seasonable levels tonight through Friday. Widespread accumulating snow is unlikely. Any precipitation will probably be this evening, possible starting as a little rain in the lower elevations. The best chance for accumulating snow in the foothills and plains will be north of Colorado Springs and south of I-70, and even here the amounts will likely be minor (dusting to 2 inches). There is a chance north of I-70, but it’s small and much of this area is likely to see no accumulation. More significant amounts (3-6 inches) are possible above treeline and some localized spots along the Palmer Divide.
We are now in a pattern with some very cold air sliding into the north-central U.S. and we will see occasional cold fronts bring some of the cold air into eastern Colorado. Another cold front over the weekend is likely to bring even colder temperatures, but a widespread significant snow remains elusive. Except for the mountains down near New Mexico where snowpack is near normal, most of Colorado snowpack is at 75% or less as of February 2nd.