The posts in this forum are NOT official forecast and should not be used as such. They are just the opinion of the poster and may or may not be backed by sound meteorological data. They are NOT endorsed by any professional institution or 
The morning AFD out of Melbourne highlights the rarity of this event:
TONIGHT...TEMP GUIDANCE REMAINS QUITE COLD OVERNIGHT WITH COOP MOS
AND THE ENSEMBLE MEAN EASILY SUGGESTING HARD FREEZE CONDITIONS FOR
THE AREA WITH RARE LOWER 20S OVER THE NORTH ZONES ROUGHLY ALONG AND
NORTH OF I-4 AND OUTSIDE THE ORLANDO METRO AREA...AND MID 20S SOUTH
OF INTERSTATE FOUR TO LAKE OKEECHOBEE AND THE MAINLAND AREAS OF THE
TREASURE COAST...THUS A HARD FREEZE WARNING WILL BE ISSUED WITH THE
MORNING PACKAGE FOR ALL OF EAST-CENTRAL FLORIDA.
WHAT MAKES THIS EVENT RATHER UNIQUE IS THE LACK OF WIND DECOUPLING
THROUGH DAYBREAK TUE AND THIS CAN BE ESSENTIALLY BE CLASSIFIED AS
AN ADVECTIVE HARD FREEZE (STATISTICALLY SEEN WELL LESS THAN ONCE
PER YEAR...ESPECIALLY ON THIS SCOPE OF AREAL COVERAGE). EXTREME
TEMPERATURES FOR THIS AREA COUPLED WITH SUSTAINED WIND WILL LIKELY
REQUIRE A WIND CHILL WARNING FOR MUCH OF THE AREA FOR APPARENT
TEMPERATURES LOWER THAN 20F COUPLED WITH WINDS 10 MPH OR GREATER.
THIS WILL BE AN ECONOMICALLY DAMAGING FREEZE EVENT THE NEXT TWO
NIGHTS.
