The cool front should pass Longmont around 5pm today. There is a general chance of thunderstorms (non-severe) for almost all of Colorado today (Figure 1 update). Small hail and gusty winds are possible today and tonight. A few cells may approach minimal severe levels. Aside from a thunderstorm cell or two, there are fairly low chances of rain or snow over the next 48 hours. It will be cool and moist.
End 9:30am update.
We’re still pulling into Spring and are alternating between fairly warm and somewhat chilly (Figure 1). I circled the two minor cool downs over the next 10 days in blue and the two rain periods (with overnight/AM snow?) in green. We hover around 70° F Monday and Tuesday (earlier in the day). Later Tuesday, a front pushed down that may trigger a few garden-variety thundershowers before rain chances most of the day Wednesday.
The Longer Range Forecast:
Temperatures Wednesday AM are still a bit above normal (Figure 2) then we drop to about normal Thursday midday (Figure 3). By Friday PM, we are back to about 15° F above normal (Figure 4).
Over the next 4 days, Longmont may received about 1/10th to 1/4th inch of water (Figure 5) with snow at least down to Boulder, western Denver, the Palmer Divide (Figure 6). We might see a coating of night time snow, of course. Details later, but there isn’t too much excitement in store this week.