Noon MDT, Saturday, October 26, 2019
We are still looking at a cold wave tonight through Thursday morning with possible record low temperatures and two periods of wintry precipitation, one late tonight through early Monday morning, and the other Tuesday into Wednesday morning.
Snow and freezing drizzle, Saturday night- Monday morning
The one real change since my blog yesterday is that it looks like the potential for a period of heavy snow will probably hold off until Sunday afternoon or night. But that doesn’t mean it will be pleasant before then. After the cold front Saturday night, low clouds and some areas of freezing drizzle and light snow are likely late Saturday night through Sunday morning, with light accumulations possible. Expect icy road conditions, especially Sunday evening and Monday morning.
Most likely accumulation through Monday morning (with most occurring Sunday afternoon or night):
8-12″ mountains & foothills (including Rocky Mountain Park, Nederland, Evergreen, and the approach to Eisenhower Tunnel).
6-10″ in Cheyenne, Boulder, Broomfield, and the Denver area west of I-25 and south of I-70.
3-6″ Colorado Springs, northeast Denver, Longmont, Fort Collins
1-3″ Weld County
Snow, round 2
And even colder air mass and another storm system is forecast to move into the region on Tuesday. Expect snow during the day Tuesday continuing into Tuesday night or Wednesday morning. With this round the heavier accumulations may spread out over the high plains with time. Expect a general 4-8 inches more.
Temperatures are likely to remain below freezing even in the lower elevations Sunday through Wednesday, and maybe Thursday too. The best chance for record low minimum temperatures in Denver and Boulder appear to be Wednesday morning and Thursday morning. The records in Denver for Wednesday and Thursday mornings are 7 and 10, both set in 1991. The record in Boulder on Wednesday morning is 6 (1993) and on Thursday it’s 5 (1991). Record low maximum temperatures are possible in the Monday through Wednesday period as well.