textproduct: Denver/Boulder
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
KEY MESSAGES
- Slightly warmer and drier Today through Tuesday.
- Wednesday and Thursday will see a chance of storms with a cold front passage at some point during the two days.
DISCUSSION /Through Saturday/
Issued at 150 PM MDT Sat Aug 30 2025
Water vapor imagery shows a shortwave trough over western Nebraska and South Dakota with Colorado under slight subsident flow behind this trough. Water vapor imagery also shows much drier air aloft than yesterday. Despite the drier air and subsidence, cooler temperatures aloft has allowed some low level instability to form with up to 1,500 j/kg of surface based CAPE across the eastern plains. This instability from daytime heating had lead to the development of scattered showers and storms across our forecast area. These storms may produce brief heavy rainfall, small hail, and lightning. Around sunset, the showers and storms will dissipate due to the loss of instability and the rest of the night will be dry.
A ridge over the Intermountain West will strengthen and become more broad Sunday through Tuesday. This will provide subsident flow to our area. With northwest winds in the low levels, the moisture will mostly leave our forecast area as afternoon relative humidity will drop to 20-30%. Therefore, dry weather is expected for the vast majority of our forecast area although the mountains could see a few raindrops each afternoon. Temperatures will remain a few degrees below normal but will trend warmer.
A very strong trough will be over the Great Lakes on Wednesday and Thursday. The trough may produce small shortwaves that will near northeast Colorado and provide weak forcing to our area. In addition, a cold front will move through our forecast area at some point on Wednesday or Thursday. This will push cooler air into the area along with better moisture. Isolated showers and storms will develop each afternoon.
The ridge over the Intermountain West will strengthen again on Friday and will move more directly overhead. This will lead to warmer temperatures that may reach the upper 80s across the plains.
AVIATION /12Z TAFS through 12Z Monday/
Issued at 525 AM MDT Sun Aug 31 2025
VFR through tonight. Winds will become north to northeast around 10 knots 16z-18z, then back to light south/west drainage winds 03z-05z.
BOU WATCHES/WARNINGS/ADVISORIES
None.
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