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Chance for T-showers Saturday, cooler Sunday

12:50 PM MDT, Friday, August 17, 2018

A weak cool front from the west on Saturday will bring a small chance for thundershowers in the midday to afternoon hours and cool the temperatures just a little bit compared to today. Then another cool front from the north on Sunday should bring cooler weather by Sunday afternoon. The cool front on Sunday may bring a period of cloudy weather, but probably not much rain.


This season’s monsoon has not been very impressive. When it has streamed north into the southwestern U.S., it has been mainly south of Denver. The southern Front Range (including Colorado Springs) have had some wet weather, but the recent rain and hail was more of a severe weather setup than a monsoon pattern. Monsoon thunderstorms are typically slow-moving, wet, but non-severe (no big hail) and are connected with a plume of tropical moisture from Mexico. We haven’t had a strong pattern like that this month, and there won’t be this weekend.


Perseid meteor shower this weekend

10 AM MDT, Friday, August 10, 2018

The Perseids are one of the two most dependable major meteor showers of the year (the Geminids in mid December are the other). The Perseids are fast-moving which can make them hard to see if you’re not paying attention. But their fast movement also means a lot of energy gets released when they hit the atmosphere, and so they are known for producing some really bright streaks with smoke trails.


The peak time is after midnight when they tend to be higher in the sky. Sunday and Monday mornings are both in the peak, but the astronomy websites and journals seem to be more focused on Monday between midnight and daybreak.


This year has the added benefit of no moon in the late night and early morning hours. The possible down side is smoke haze from western fires that could dim the display a tiny bit.  But the middle and upper atmosphere flow this weekend will be mainly from the north (rather than west-to-east) so there is hope that we will see clearer skies in Colorado.


…and the weather

Dry conditions and average to slightly above average temperatures are expected across the central Rockies region through Monday.

A few strong thunderstorms around eastern Colorado today

12:15 PM MDT, Monday, August 6, 2018

A cold front yesterday evening brought cooler and more humid low-level air from the Great Plains into the Front Range. That should fuel some showers and thunderstorms this afternoon and evening. Many of us will likely get at least a brief shower, and a few spots will probably see a strong thunderstorm with heavy rain and hail. One of the most popular local-scale models (the HRRR) is suggesting that the heavy thunderstorms may stay south and east of Denver, but there is enough uncertainty that I think all of the Front Range should be prepared for the possibility of thunderstorms.


There should be another, but smaller, chance for thunderstorms Tuesday afternoon. Then a mainly dry and warm (but not very hot) week is in store for the Front Range. Very hot weather will likely be close by in the western U.S., including western Colorado valleys.



Wet afternoon, mainly dry and warm weekend

12:30 PM MDT, Friday, August 3, 2018

A weak disturbance with a bit of monsoon moisture is moving through Colorado today and is kicking up more showers than I had expected. So the afternoon and evening are likely to see some sprinkles and showers around, and a few spots could see a brief heavy thunderstorm.


The atmosphere should dry out a bit Saturday and Sunday, so expect more sun, warmer temperatures, and only a small chance for a localized thunderstorm. High temperatures Saturday and Sunday will likely be in the upper 80s to low 90s.


Next week we are likely to be in a pattern with very hot weather in the West (including western Colorado) and average to a bit cooler the average on the Great Plains. The Front Range region is likely to be mainly warm and dry, but we may get one or two brief periods with a push of cooler air from the east. It looks like one of those cooler spells (with a better chance for thunderstorms) will be Monday.

A few more relatively moist days, warmer next week

10 AM MDT, Saturday, July 28, 2018

I was away for 9 days and it’s nice to see that nature watered the yard and took the edge off the local fire danger while I was gone. We have a couple more days with below-average daytime temperatures and above-average atmospheric moisture before a drier trend sets in Monday afternoon or Tuesday.


Saturday through Monday morning should feature occasional cloudy intervals with maybe some local fog in the mornings and areas with afternoon and evening showers and thunderstorms. Most areas are likely to get at least a sprinkle and a few localities could experience a heavy thunderstorm either late Saturday or late Sunday.


It looks like a trend toward fewer cloudy intervals and warmer temperatures should begin Monday afternoon or Tuesday.

Next real cool down, Sunday afternoon or Monday

6:45 AM MDT, Thursday, July 19, 2018

A cool high pressure from the north should arrive by Monday, possibly on Sunday, bringing cooler weather and a greater likelihood for clouds and showers. Until then we will be in this hot summer pattern, with today likely to be the hottest day. There is a weak cool front from the east that may make it as far west as the Front Range on Friday. But that is likely to be weak and not really boost the chances for rain. On Saturday there will probably be a little more moisture in the mid levels of the atmosphere leading to some isolated thunderstorms that will cool things off briefly on the local level. But the real change to cooler weather should be Sunday afternoon or Monday.

Sunday: cooler and a chance for thunderstorms

5PM MDT, Saturday, July 14, 2018

A cold front pushing south near the Montana/Wyoming border will likely reach Cheyenne in the late night hours and push through the northeastern plains & foothills  of Colorado Sunday morning to midday (with little or no impact west of the continental divide). For the Front Range region that should take about 10 degrees off the high temperatures for Sunday. Areas of showers and thunderstorms in the afternoon will cool it down more in local areas. Although it’s not a sure bet, at least some rain will probably occur over more than half of the Front Range region and high plains, and that’s as good as it gets this month!


There has not been a major pattern shift, so more hot and mainly dry weather will likely return in the week ahead.


90-degree days

For those wondering, both Denver and Pueblo are seeing the most 90-degree days in their records for the season through July 14th (47 at Pueblo and 32 at Denver/DIA). In Boulder we have recorded 22 90-degree days through today. Since the current climate station was established in Boulder in 1990, this year’s number of 90-degree days through July 14th falls short of the years 2000 (25 days), 2002 (24 days) and 2012 (24 days).