Temperatures will begin to normalize today as the heatwave slowly breaks down. Anomalously high atmospheric moisture will advect into the High Plains today by an upper-level disturbance from the Pacific Northwest. Afternoon temperatures will reach the upper 80s to low 90s, dewpoints in the upper 40s to low 50s, and precipitable water (PWAT) values around 0.95”. Coupled with an approaching cold front, these conditions will support scattered to widespread thunderstorms across the District capable of producing more meaningful rainfall (when compared to the last few days). Convection initiation will begin around noon across the foothills, with storms moving east onto the plains between 15-25 mph. Rainfall will favor the Foothills and Palmer Divide, with slightly lower rainfall amounts possible across the Plains. Thunderstorm activity is expected to dissipate by the late evening, with skies gradually clearing overnight.

STORM RAINFALL POTENTIAL AND DURATION: Thunderstorms today have the potential to produce 0.25”-0.75” in 10-30 minutes.

WORST CASE SCENARIO: A slow-moving, strong thunderstorm may be capable of producing up to 1.25” or more in 30 minutes or less.

A LOOK AHEAD: Subtropical moisture continues increasing Wednesday to around 150% of normal, while afternoon high temperatures cool another 4-6 degrees following the cold front overnight. Guidance suggests scattered to widespread storms Wednesday may be capable of producing meaningful rainfall across portions of the District tomorrow afternoon and evening.