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Forecast details for the first part of the week: hot with strong storms for the mountains. Increasing thunderstorm chances for the front-range

07/20/26 9am: Morning, its Monday. Going to be very hot along the front-range today, but maybe a few storms later. Den/Bou and much of the front-range urban corridor is under a Heat Advisory between 10am-10pm for temps near/above 100 degs today.

First good to see a bit more rain across parts of the mountain, western and southern CO yesterday (fourth image shows 24hr observed rainfall from MRMS).

Forecast for the next few days.

There will be a good chance for scattered thunderstorms across parts of the north-central mountains today and tomorrow between 1pm-10pm with some heavier rain in spots.

For Den/Bou and the front-range an increasing chance for storms each day this weak, peaking Wed and Thu but still a chance today and a better chance tomorrow behind a cold-front.

For today some stronger storm in spots across the north-central mountains (Eagle, Summit, ClearCreek, Grand, etc) extending towards Aspen/CB and into the San Juans (near Telluride, Silverton and Wolf Creek), 1pm-9pm, strongest after 3pm today.

For tomorrow looks like the focus for heaviest storms will be over northern CO: maybe from near Beaver Creek up toward Craig and Steamboat (northwest CO) and especially over the northern Front Range mountains: IPW, RMNP, areas near Grand Lake, Trail Ridge, extending towards Cameron Pass: 2pm-10pm tomorrow, heaviest storms after 5pm. But areas near Summit/Grand will also have some storms.

Also some strong storms over southwest CO / San Juans again on Tue: 1pm-8pm

For Den/Bou, the foothills and the front-range urban corridor a chance for some high-based weaker storms today: mostly between 3pm-9pm. The cloud-cover should at least help with the heat this afternoon.

Then a better chance for some later afternoon / evening thunderstorms over the northern front-range tomorrow, favoring areas from Boulder to Ft. Collins to the WY border from 7pm Tue through 2am Wed (could be some night-time storms). Hard to say if the coverage extends down towards Denver (but likely a few storms).

Then as I mentioned yesterday, deeper upslope, cooler with much better rain chances for Den/Bou and the adjacent mountains on both Wed, Thu and possible Fri as well: 1pm-8pm each day.

Mountains will also have good storm chances Wed-Fri as well. More on that later.

First image loop shows forecast radar over the next 48hrs (6am this morning to 6am Wed) from latest HRRR. Second image shows the current Heat Advisories (orange), Air Quality Alerts and even a Fire Warning (for the fire near Kremmling). Third image shows a static view of forecast radar at 8pm tomorrow night from latest HRRR (could be getting wild behind the cold-front). Fourth image is 24hr observed rainfall (from yesterday's storms).

About Seth

About Seth

About Seth

Seth Linden combines professional expertise with a lifelong passion for weather forecasting.

A Colorado native and avid skier, Seth turned his early fascination with weather into a career, earning degrees in Physics and Atmospheric Science from CU Boulder. For over 25 years, he has worked at the National Center for Atmospheric Research (NCAR), where he develops winter weather decision support systems for Denver International Airport and state transportation departments.

He shares his forecasting expertise through the Seth's Weather Report Facebook group, specializing in winter storm predictions.


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