Houston starts Monday clear and near 80, but a Heat Advisory is in effect as the city heads for a 99-degree afternoon and triple-digit heat index.

A sunny 76-degree Monday sets up a cooler night, warmer Tuesday and midweek storm chances in Milwaukee.

Oklahoma City faces a dangerous 107-degree Monday with heat-index values up to 110. A slight storm chance could bring damaging winds before a brief midweek cooldown.

Dallas is facing a dangerous 108-degree Monday with heat index values up to 111. Triple-digit heat will continue through the weekend.

San Antonio is headed for another 103-degree afternoon Monday, with a Heat Advisory continuing through Wednesday. Slight rain chances arrive Thursday, but cooler weather is still out of sight.

Six lightning-sparked fires are burning across the Everglades, and Shark Valley's 15-mile loop is closed indefinitely.

Fog fades Monday as St. Louis warms to 84 degrees under mostly sunny skies. Storm chances arrive Wednesday before another hot weekend.

Charlotte gets two sunny, rain-free days before showers and thunderstorms return Wednesday night.

Raleigh gets a sunny, nearly 90-degree Monday before storm chances ramp up later in the week. Thursday and Friday look like the wettest stretch.

Philadelphia starts sunny and mild Monday, but a few late-day storms could interrupt outdoor plans.

Atlanta gets a sunny, dry Monday with a high near 92 before storm chances rise midweek. A Code Orange air alert is also in effect through Monday evening.

Early showers give way to sun and a high near 73, but dangerous Lake Erie rip currents make Monday swimming a bad bet.

Washington starts the week with clear skies and low humidity, but thunderstorms are likely by Thursday. The weekend stays hot with highs near 90.