As a cold front over the Tennessee Valley advances southeast into the Southeastern United States, high pressure over the Western Atlantic seas will move farther east into the Atlantic waters.
As the wind speed decreases to 15 knots or fewer, the wind flow will continue to swing gently to the southeast tonight, allowing the temperature to stay comfortable.
A short wave will continue to sweep north northwest from South Florida into Central Florida at the same time.
This will maintain the 500 MB temperatures across South Florida, resulting in scattered showers and even a few thunderstorms over the interior portions of the state into the nighttime hours, particularly near Lake Okeechobee and the Everglades National Park.
The principal effects of the thunderstorms will be lightning strikes and strong gusts, which will last for many hours.
Lows tonight will be near 70 degrees in most places, except locations in the lower to mid 70s. These lows will be among the hottest of the year for this time of year, according to the forecast.
On Tuesday, a cold front moving over the Southeastern United States will stall over northern Florida, forecasters predict. This will enable the steering flow over South Florida to shift to the south/southeast, allowing moisture to continue to push its way into the area as a result.
During the afternoon hours, isolated to scattered showers are expected to occur, particularly over Lake Okeechobee and the NE portions of South Florida.
The possibility of isolated thunderstorms in the afternoon hours cannot be ruled out, particularly in areas where the sea winds and lake breezes meet. When a thunderstorm occurs, lightning strikes and strong winds will be the most noticeable effects.
Tuesday's high temperatures will be in the mid-80s throughout much of the country, except the East Coast metro regions, where they will be around 80.