Temperatures throughout the eastern half of the nation are trending colder with this cold shot. For a year that's been generally winterless so far, the current cold shot is a not-so-friendly reminder of what "typical" winters are like. This shot of chill is impacting the Southeast as well, with the potential for below freezing temperatures down into portions of South Florida (away from the water) for tonight.
The NAM is projecting lows in the 20's (the teal-ish shade) for areas north of Fort Myers, with low 30's possible down into the northern fringes of the Everglades late tonight and tomorrow morning, with much of the region under various frost and freeze advisories through tomorrow morning as well. Temperatures this morning in the Sunshine State were in the 30's and 40's at daybreak but were accompanied by very low dew points (single digits and low teens north of I-4 in Central Florida), with wind chills at or below freezing. Not much worse than us but for them, it is a bit more "biting".
Such chill is not unprecedented for South Florida in short stretches -- you might remember how chilly temperatures in the Southeast two winters ago endangered Florida's manatee population because of consistent and persistent relative cold for South Florida. However, short-lived cold snaps like this one are not out of the ordinary...and for this region they will see temperatures quickly rebound by week's end as high temperatures in Miami will approach 80 degrees, slightly above their average high of 76 for this time of the year.