Back in the 90s by tomorrow

Few afternoon thunderstorms to rumble through

DENVER - It's going to be a pretty typical start to September!  A few showers and storms will be possible each afternoon and early evening across Colorado.  The storms will bring some relief from the recent heat and haze that has been the main weather story for the past couple of weeks.

Temperatures will start off in the upper 50s to low 60s across the plains, with highs in the upper 80s this afternoon.  We'll see more storms build in the mountains by lunch and highs will top out in the 60s and 70s.  

The late summer weather pattern often gets rather lazy in the skies over the lower 48 states. The winds aloft become quite light and the upper level temperatures are warm.  The combination of low wind speeds and warmer temperatures aloft are just the opposite of what we have in the late spring.  In May and early June, the winds aloft are fast and the upper level temperatures chilly - that provides energy and instability for severe thunderstorms.

By late August and early September, the shorter daylight and lower sun angle means that our average high temperatures are slipping from week to week.  There is less heating at the surface and the upper atmosphere is warmer - this tends to provide less energy and instability, so thunderstorms are not as strong.

 By Wednesday , we warm up just slightly. Highs look to potentially top out in the upper 80s, but it doesn't last long. We drop back into the low to mid 80s with an increased chance for rain Thursday and Friday.

By the weekend, the flow of moisture from the southwest may ease a bit. Skies will be mostly sunny and temperatures comfortable for early September. 

The showers will help to clear the air of the smoke particles that have hung heavy in our skies recently.  There are no pollution advisories in effect for either ozone or for wildfire smoke.  The pollen count is moderate for weeds, but should be lower with the showers in the next few days.

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