09/28/26 9am: Morning, its Monday. I'll tell you what its going to be the battle between the models for the approaching storm system, as they still can not agree on the low track and hence show wildly different precip amounts for the northern front-range and mountains for that matter (as you can see in image 3 and 4 below)!

Anyway, first good to a bunch of rain streaming into the state as expected this morning (you can see all the moisture moving in from the southwest in the regional satellite/radar image below). Already some moderate rain ongoing over southwest CO and this main batch of rain will move across the rest of the state this afternoon.

For the north-central mountains / I-70 mountain corridor a round of rain mostly from 1pm-9pm today. Some snow above 12k ft (1-4" in spots). Then a break overnight. More rain showers during the day tomorrow, but mostly south of I-70.

For Den/Bou and the front-range, cloudy this morning, then a chance for light to moderate rain showers from 2pm-11pm. Best chances from Denver south and east, near/along the Palmer Divide and in the foothills west/southwest of Denver. Then a break on Tue.

Rain showers (and snow above 12k ft) will continue over southern CO tonight, and during the day Tue. On Tue, best chances for rain will be south of Gunnison to BV to Springs line.

Then high uncertainty on how the main storm system evolves for Wed into Thu....

ECMWF still has the main low setting up much farther north (compared to most of the other models) and hence shows a heavy round of upslope rain for much of the front-range from about 2am Wed through 2am Thu. This includes Den/Bou, although appears Bou maybe on the northern endge of the meaningful precip, with much less from near Boulder to Ft. Collins to the WY border.

Now GFS (and GEM and some other models) have the main surface low setting up much further southeast and hence have almost no rain for Den/Bou on Wed into Thu with all the action from Springs south.... so it unclear how this is going to go.

The north-central mountains / I-70 corridor should also get a round of heavier rain/snow from about 3am Wed through 6am Thu. If the low stays north and the heavy rain develops, then also some potentially heavy snow above 11k ft: maybe 5-10"+ by Thu am, best chances near Loveland Pass / ski areas, A-Basin, Grays/Torreys, Berthoud and Jones Passe, also closer to Hoosier Pass, etc.... High uncertainty right now!

First image is regional satellite/radar view. Second image is forecast radar over the next 48hrs (6am this morning to 6am Wed) from latest HRRR. Images 3 and 4 compare forecast total liquid precip form now through 6am Thu from latest ECMWF and GFS models... you can see how different they are (will be very interesting to see what model is more correct for this event).