A large and powerful coast to coast storm system moves north of Florida this weekend, dragging a cold front into our area by Monday.
Before that happens though, we have to deal with some exceptionally dry air in the mid-levels. Meanwhile, onshore flow in the low levels will bring some clouds, but those clouds won't be able to develop vertically due to the dry air aloft. So expect mostly sunny skies Saturday, with highs in the upper 70s across the entire region.
Overnight tonight, winds shift out of the south, keeping our temperatures mild and into the mid to upper 60s. Tomorrow, daytime highs will range from the low 80s in the Treasure Coast to the mid-80s in Palm Beach County, despite winds out of the south, we'll still have plenty of dry air aloft, limiting our cloud cover.
By Monday, the front moves through South Florida. Right now, all major models suggest the best timing for this will be Monday morning, meaning if we see any isolated or widely scattered showers out of this system, it's likely to happen before noon. Once the front passes by, exceptionally dry air settles in behind it with cooler air following. Highs will still top out in the upper 70s.
The coldest day of the week will be Tuesday with highs in the low to mid-60s. Overnight lows Tuesday night into Wednesday morning may range from the mid-40s to around 50 degrees. We'll spend all of next week trying to rebound from this shot of cooler, winter-like air.