The coldest air of the season moved into the Tampa Bay area overnight, dropping temperatures into the 30s and 40s this morning.
High temperatures today probably won't make it out of the 50s, though skies will be sunny.
"It's going to be significantly colder,'' said Bay News 9 meteorologist Juli Marquez.
Cold weather shelters opened Wednesday night in Hernando, Pasco and Hillsborough counties. A freeze watch was posted for Hernando and Citrus counties but forecasters were uncertain if the cold would remain long enough to cause crop damage.
A warming trend will begin Friday, pushing weekend highs into the mid-70s.