Forecast models from the National Weather Service and private ensembles project a high in the mid-90s for Denver on August 21 under a warm, dry air mass and building high pressure typical of late-summer Front Range conditions. The closely matched 96–97°F and 98–99°F bins reflect minor differences in expected peak solar heating, downslope wind strength, and afternoon boundary-layer mixing. Key variables include any late-day convective cloud development that could cap temperatures, exact 700-hPa temperatures, and surface dewpoint depressions that modulate sensible heat. Updated model runs and NWS briefings on August 20–21 will likely refine these probabilities ahead of resolution.