Forecast for the rest of the week: cold-front and thunderstorms for the front-range on Wed

07/15/25 8:45am: Morning, we have some weather to talk about. Generally an increase in thunderstorm chances, especially starting tomorrow for the front-range, with better monsoon moisture for the mountains by Fri and Sat. Here are some main points

• Hot today for Den/Bou and the front-range with just a slight chance for isolated storms from 2pm-6pm, best coverage around the edges of the metro area (foothills, Palmer Divide)

• Overall best chances for storms today will be along/south of a line from Castle Rock to Leadville to Aspen, generally over south-central CO: 1pm-8pm

• A cold-front will move down the front-range (across Den/Bou) this evening and usher in much deeper moisture, some low clouds and cooler weather, Wed will start out much cloudier for areas east of the Cont. Divide

• We will have a moist upslope regime in place for Wed and that will lead to rounds of heavy thunderstorms for parts of the front-range (including Den/Bou) from 1pm-9pm, likely multiple rounds (best chances 3-6pm tomorrow)

• For the north-central and front-range mountains tomorrow isolated to scattered storms from 1pm-8pm, best coverage from Summit Co east and especially over the Front Range mountains (along/east of the Cont. Divide), heavy rain in a few spots east

• On Thu deeper monsoon moisture returns to southern CO, but will be confined down there initially. So on Thu most of the thunderstorm action will be along/south of a Pike's Peak to Buena Vista to Ouray line (southern mountains will be favored: San Juans and Sangres): 12pm-8pm on Thu.

• Further north for north-central mountains isolated late day storms on Thu mostly after 4pm and mostly from Breck south.

• Little to no storms for Den/Bou on Thu

• The deeper monsoon moisture spreads across the mountains on Fri and Sat....those days likely bring the best chances for afternoon thunderstorms to parts of the north-central mountains and parts of western CO (higher terrain): 1pm-8pm on each of those day

• More limited coverage over Den/Bou on Fri and Sat but still some storm after 2pm

• Better coverage of storms over southern / southeast CO on Fri and Sat (and mountains)

  
  

So you can see decent thunderstorm chances on most days this week. Worst of the weather for the front-range will be Wed. Worst of it for the mountains Fri and Sat.

First image shows forecast total liquid precip from now through 12am Sun from latest NWS Blend of Models, take it with a big grain of salt but shows where signals are for heaviest precip the next 4 days. Second image shows the much deeper moisture on the front-range tomorrow at 12pm (behind the cold-front). Third image shows the cold-front draped over the front-range at 12pm Sun. Fourth image loop shows forecast radar over the next 60 hours (6am this morning through 6pm Thu) from latest NAM-3km model.