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630 FXUS65 KBOU 011111 AFDBOU Area Forecast Discussion National Weather Service Denver/Boulder CO 511 AM MDT Sat Aug 1 2026 .KEY MESSAGES... - Heat returns by the end of the weekend, with temperatures reaching up to the 100s on Sunday and Monday. - Heat Advisory in effect for the I-25 corridor from Sunday through late Monday evening. - A little cooler for Tuesday and Wednesday, but warm and generally dry conditions will continue for the next several days. && .DISCUSSION /Through Friday/... Issued at 220 AM MDT Sat Aug 1 2026 Bit of a quiet weekend ahead as the upper level ridge restrengthens over the Four Corners region, which will bring hot temperatures and drier conditions to the region. Main concern will be the heat, particularly Sunday and Monday where we currently have a Heat Advisory in effect for the I-25 Corridor and portions of the northern plains. Temperatures will reach up to the mid-90s for much of the plains today, with overall clear skies throughout the day. Due to the north/northwest flow aloft, smoke from wildfires in the Pacific northwest will likely filter in again. This may create hazy skies. For the mountains, only a few weak showers possible (~20% chance) in the afternoon. By Sunday, the axis of the mid-level thermal ridge will shift east into Colorado. 700-mb temperatures will reach up to 19-22 C, which translates to upper 90s to low 10s across the plains. We could break daily temperature records Sunday and/or Monday. Denver`s current record for August 2 is 101 F set in 2012, and the current forecast is 100 F. A Heat Advisory remains in effect for the I-25 Corridor and portions of the northern plains, including Greeley, Sunday through Monday. It still looks like we will see a brief reprieve of the heat after Monday, as an upper level trough treks across the northern U.S. This will bring a cold front down sometime Monday night/Tuesday morning. Ensemble guidance continues to indicate scattered showers and thunderstorms behind the front on Tuesday. However, there doesn`t seem to be enough moisture to produce widespread precipitation/beneficial rainfall at this time. There is still some uncertainty with how long the "cooler" air sticks around, with ensemble guidance varying between models and model runs. NBM has trended slightly cooler with this forecast package and will probably continue to do so as we get closer to next week. The plains will likely be somewhere in the 80s for Wednesday. Towards the end of the week, global models favor hot temperatures returning, with forecasted highs in the upper 90s again. Due to the upper level ridge in the desert southwest and resulting northwest flow aloft, doesn`t look like we will receive much monsoon moisture. Aside from isolated afternoon showers and weak thunderstorms, dry conditions should prevail. && .AVIATION /12Z TAFS through 12Z Sunday/... Issued at 506 AM MDT Sat Aug 1 2026 VFR conditions likely through the TAF period. Typical diurnal wind pattern today, with winds shifting to the northwest to east/southeast throughout the day. With the upper level ridge restrengthening, no convection and ceiling issues expected today. The only uncertainty is smoke concentration for today. Guidance keeps the worst of the near-surface smoke east of all terminals. However, if winds are slower to turn southeast later this afternoon/evening, smoke could be advected into the airports, which could cause slant-wise visibility issues. && .BOU WATCHES/WARNINGS/ADVISORIES... Heat Advisory from noon Sunday to 9 PM MDT Monday for COZ038>043. && $$ DISCUSSION...MAI AVIATION...MAI