Forecast details for today through Sat. Cold-front and better rain chances arrive this evening

09/04/25 8:40am: Alright, we have a cold-front on the way. Here are some details for the next couple days.

Initially, prior to 8pm this evening most of the thunderstorm action will be over southwest CO / San Juans today (south and west of Monarch Pass) from 2pm-11pm. There could be some rain showers that linger overnight.

Initially this afternoon for the north-central mountains, front-range mountains and front-range urban corridor (Den/Bou) just isolated, high-based storms from 3pm-7pm ahead of the cold-front.

Cold-front will move down the front-range between 8pm-10pm this evening. As it moves in, it will likely kickoff a round of weak / scattered thunderstorms (for Den/Bou and the front-range) from 8pm this evening through 2am Fri, best chances in/near the foothills and along the Palmer Divide (likely high-based gusty storms, moisture is limited).

There maybe some rain showers over western CO and the central mountains early tomorrow morning.

Then for Friday best thunderstorm chances will be where the cold-front stalls out: southern CO. Basically all of the central mountains from Summit Co south, (including Tenmile, Sawatch, San Juans, Sangres, etc) will be favored for storms on Fri from 11am-11pm. Some heavier rain in spots especially over southern CO

For Den/Bou and the front-range on Fri: isolated storms from 2pm-8pm, best chances in/near the foothills and from the Palmer Divide south

On Saturday good coverage of storms across both the north-central and south-central mountains from 12pm-8pm, heaviest storms again expected from Summit Co south across central / southern mountains again (Pikes Peak area and south to Sangres will be favored). Sat will likely be the wettest day for the north-central mountains.

For Den/Bou on Sat some isolated to scattered storms later in the day: 4pm-8pm, best chances in/near the foothills again and over the southern front-range.

First image loop shows forecast radar over the next 60 hours (6am this morning through 6pm Sat) from latest NAM-3km model. Second image shows the cold-front moving down the front-range at 11pm tonight. Third image shows where the best chances for rain and stronger thunderstorms on Friday.