How do location near the coast and prevailing wind patterns affect climate in the southern united states

For most of the Southern United States, the climate is getting wetter since 1901 rainfall during autumn has increased by 30%, the average temperature since the 1970's has increased by 2 degrees Fahrenheit, and the average number of freezing days has declined by 3 days, this is a sign of global climate change, and these regions are in the path of the Gulf of Mexico and the Pacific Oceans, the states located in these regions near to the coasts means that they are exposed more to the changing weather patterns, and warmer air coming from the oceans, this has increased precipitation whilst also raising temperature.  

Answergoogle earth; i believe this is the correct answer, plz check first;

Answer the use of flood plains and irrigation;