Tracking another seasonal day ahead of a heat wave

THIS MORNING: Mostly clear and cool with lows in the mid-50s.

TODAY: Sunny and seasonal with highs near 80. The UV index reaches very high levels that can cause sunburn in 20 minutes.

EXTENDED: High pressure building out west will move in our direction by midweek, allowing temperatures to increase as winds shift more to the south. Highs on Wednesday reach near 90, with humidity increasing even more by late week. A chance of storms is possible with a cold front between Thursday and Friday, especially north of I-70. Heat indices Thursday will top out in the upper 90s. Friday won't be quite as humid following the frontal passage, but hot temperatures hang on for the weekend and beyond. The heat index could be near 100 degrees by Sunday afternoon.