The jet stream has a major influence on Florida weather. Low pressure systems generally develop and track along the jet stream, so Florida experiences more frequent and stronger low pressure systems from late fall into early spring during strong El Ni o events. This increased storminess brings slightly cooler than normal temperatures, a greater chance of heavy rain and flooding, and severe weather such as tornadoes and damaging wind storms. La Ni a, the unusual cooling of the ocean surface along the equator, causes weaker temperature differences and results in the average position of the jet stream being much further north, away from Florida. Strong La Ni a events typically bring fewer low pressure systems to Florida in the fall and winter.
Weather conditions are much drier and slightly warmer.
La Ni a brings an increased chance of drought and wild-fires and, surprisingly, a greater chance of freezing weather. The wintertime storm track is well north of Florida increasing the chances that strong low pressure systems will pull cold Canadian air into the deep south behind them. El Ni o favor certain types of hazardous weather, but it is important to remember that dangerous weather can occur in any year, and you should always be prepared.