Monthly Archives: September 2021

Some rain, and cooler weather on the way

6:30 AM MDT, Tuesday, September 28, 2021

A cold front is coming our way on Wednesday. But the trend toward cooler will start today as a weak storm system to the south creates some clouds that limit the solar heating. There may even be a few showers around, mainly in the mountains. It should still be warm, just not the record and near-record levels of the last few days.

Wednesday may start out mild, but a cold front during the day should usher in a few cooler days with afternoon highs in the 60s for the lower elevations. There is a good chance for rain between tomorrow afternoon and Thursday morning. Snow levels will be high, mainly up in the tundra where a few inches are likely. By the end of the week drier weather will be back over the Front Range region, but it won’t be getting as warm as what we had the last few days.

Record high temperatures possible

6 AM MDT, Thursday, September 9, 2021

As if the smoky haze isn’t enough, the high temperatures Thursday and Friday are likely to be near or at record levels. The records for Denver and Boulder both 94 today, and for Friday they are 93 in Denver and 94 in Boulder. The next chance for showers does not get here until Saturday, and then it’s only a very small chance.

For some historical perspective, last year we were experiencing an unusually early occurrence of snow and freezing temperatures on the 8th and 9th of September!

Slightly better chance of rain for a couple days

6 AM MDT, Wednesday, September 1, 2021

Moisture from what was once Hurricane Nora in the Pacific has resulted in some locally heavy rain in the desert Southwest. Some more locally heavy rain and flash flooding is possible today in western Colorado, particularly in the San Juans. For the Front Range, the chance for significant rain is smaller. It should be cooler, with some showers or thunderstorms around, but many parts of the Front Range could get through the next couple days without any significant rain that really soaks into the soil.

The good news is that the prevailing southwesterly winds should help lower the smoke concentration in the air for a day or two. The bad news is that the prevailing wind should become more westerly again by Friday, and there is still a lot of smoke being pumped into the atmosphere to our west in California.

For August, the Boulder climate station had 0.68 inches of rain, which is only 40% of the 30-year average. It is the 13th August in a row that is drier than average. No other month has had such a consistent anomaly, either dry or wet. Although there were some local areas that got a heavy thunderstorm during August, the major climate stations in Cheyenne, Boulder, Denver, and Colorado Springs had a drier and hotter August than average.