6 AM, Friday, November 15, 2019
A fast-moving storm will move across Wyoming on Saturday and drag a weak cold front through Colorado. There is a good chance for some light snow near and west of the high mountain passes Saturday afternoon and evening (1-3 inches) and maybe some sprinkles of rain in the valleys. For the eastern foothills and plains there is about a 60% chance of no measurable precipitation and a 40% chance for some rain showers or rain changing to snow Saturday afternoon or evening with little or no accumulation.
Expect Sunday to be dry, and even though we will be behind the cold front, temperatures should still be around seasonable levels.
The next real chance for precipitation appears to be late Wednesday or Thursday.
10 AM MST, Sunday, November 10, 2019
A strong cold front is approaching Casper, WY from the north at this hour. It will likely move through the Cheyenne area in the late afternoon and sweep southward through the Denver-Boulder area between 6 and 8PM.
Following the cold front we should see an increase in low clouds and a chance for freezing drizzle toward the midnight hour. After midnight as some higher level ice crystal clouds move over the area, the freezing drizzle is expected to transition to intermittent snow (mainly light). The snow will likely taper off within a few hours of daybreak. Accumulation are likely to vary from a dusting to about 2 inches for the morning commute.
The cloud cover will probably be slow to thin on Monday, and daytime temperatures may fail to get above freezing in the urban corridor. Milder weather should return Tuesday afternoon.
Noon, Friday, November 8, 2019
It looks like we may get an unseasonably warm weekend ahead of the next strong cold front late Sunday. On Saturday, temperatures in the Colorado Springs-Denver-Boulder-Fort Collins corridor may get near 70, and possible back to at least 60 on Sunday. The cold front will probably move through Cheyenne Sunday afternoon, and then move south in the evening through the Colorado Front Range urban corridor.
Like the last cold spell, the cold air mass will be shallow, so the thickest cloud cover and best chance for precipitation will be in the lower foothills and plains. West Slope areas will have only minor changes.
Freezing drizzle is likely Sunday night in and along the lower foothills (mainly below Estes park and Nederland). Some areas of snow may develop by Monday morning causing some light accumulation (around an inch). Although the clouds may thin a bit Monday, it will likely be a mainly cloud day with temperatures only rising to around freezing. Tuesday is expected to bring a return to milder weather.
5:45 AM MST, Tuesday, November 5, 2019
Over the next 5-7 days we are in for at least two cycles where we get a day or two of mainly sunny and mild weather, then a period of mainly cloudy and cold. The mild periods should be today through Wednesday morning, and again Friday and Saturday. The cold spells should be Wednesday afternoon into Thursday morning, and again Saturday evening through Monday. (The next cold period could start by Wednesday morning in Cheyenne.)
Precipitation? There are no organized storm systems, so no major snowfalls are expected. There is a small chance for some light snow or flurries during the cold periods. It is more likely that there will be some low clouds and areas of freezing drizzle in the lower foothills and plains Wednesday evening-Thursday morning, and again on Sunday.
The cold air masses over the next week are shallow and coming from the north and not the west. That means that the changes in weather for the lower foothills and plains will be less noticeable in the high mountains and West Slope. It’s possible that even Nederland and Estes Park will be above the low stratus clouds.