National Weather Service Forecast Discussion |
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674 FXUS65 KBOU 061754 AFDBOU Area Forecast Discussion National Weather Service Denver/Boulder CO 1154 AM MDT Thu Aug 6 2026 .KEY MESSAGES... - Very warm temperatures return to the area today. - Hot this weekend with highs reaching 95 to 105 across northeast Colorado. && .DISCUSSION /Through Wednesday/... Issued at 1255 AM MDT Thu Aug 6 2026 An upper level high over the Desert Southwest will continue to move slowly northeastward. Northwestflow aloft around the high will persist today, continuing to bring smoke from the Pacific Northwest. Temperatures will warm up more today, with highs returning to the 90s. The airmass will be dry with mostly sunny skies prevailing throughout theday. For Friday and the weekend, the upper level high slightly strengthens Friday and stalls over the Four Corners on Saturday and Sunday. The warmest air is expected Saturday and Sunday, with highs reaching 97-105 across northeast Colorado. With the ridge centered over the Four Corners, we will maintain a weak west- northwest flow aloft, which is expected to continue transporting wildfire smoke into the region.This could affect high temperatures over the next several days. Today will offer a glimpse of how much this smoke will affect high temperatures. We are on track for Heat Advisories for Saturday and Sunday, but temperatures could fall short due to the wildfire smoke. The airmass stays very dry (precipitable water values 50% of normal) Friday and Saturday. Moisture finally starts to increase Sunday, thoughprecipitablewater values stay below normal. We should see a few showers and storms form over the higher elevations Sunday afternoon. For next week Monday through Wednesday, the upper level high weakens some. Models differ on the location and strength of the upper level high. The GFS keeps the high parked over the Four Corners and only weakens the ridge slightly. This would limit monsoonal moisture and help keep temperatures very warm. Meanwhile, the ECMWF shows the ridge weakening more and ending up over New Mexico and Texas. This leads to a better monsoonal fetch, cooler temperatures, and a better chance for showers and thunderstorms. && .AVIATION /18Z TAFS through 18Z Friday/... Issued at 1145 AM MDT Thu Aug 6 2026 As seen on ACARS soundings, the inversion that was in place this morning is starting to mix out and should give way to northeast winds this afternoon. HRRR Smoke continues to show smoke persisting at all three terminals throughout the TAF period with the possibility for some slantwise visibility issues at times. Otherwise, a typical diurnal wind pattern is expected. No ceiling issues are forecast and winds should stay under 12 kts. && .BOU WATCHES/WARNINGS/ADVISORIES... None. && $$ DISCUSSION...12 AVIATION...MV