Longmont Weather Forecast: Mostly cool and mostly smoke-free weather for start of week

In brief:

Cold fronts are finally cooling us to, or below, normal this week, and are bringing in fresh clean Canadian air.

Forecast discussion:

The flow across the state is out of the northwest or west-northwest this week. Ripples in that flow will bring down a couple of additional cold fronts that deliver wind and cooler temperatures (Figure 1 below).

Figure 1: the 500mb upper air forecast map for Tuesday at noon from tropicaltidbits.com

This flow and the surface cold fronts have really scoured out the smoke. You get to breathe easier (unless our local fires flare up again Figure 2).

Figure 2: the HRRR smoke forecast for Monday noon from NOAA

We will warm back to just about 80 degrees Tuesday and Wednesday then our next cold front drops temperatures about 25 degrees going into Thursday. You will feel that chill!

Figure 3: the 10 day graphical forecast for Longmont from weatherunderground.com

The longer-range forecast:

We climb back to the mid-70s for the start of the weekend, then another afternoon cold front drops us 10 degrees into Sunday (Figure 3). Neither the weatherunderground model (Figure 3) nor the GFS (Figure 4) give us any rain over the next 10 days. Hang in there, it will rain or snow someday. (If you were watching, our fantasy snowstorm for the time period around Oct. 20 covered in the last forecast discussion HAS vanished as well. Oh well.)

Figure 4: the 10 day precipitation total forecast from the GFS and weather5280.com