La Nina is a weather phenomena that impacts the United States in the year that El Nino does not. La Nina tends to lead to drier weather and could lead to more wildfires in the central and southern parts of the country. The northwest a lot more wet during this effect.
Weather can affect people in a variety of ways. Rainy dreary weather can make people feel tired, or depressed. Sunny days can make people feel happy. Storms can flood and damage homes, and businesses which cost people money to recover from. Weather can also harm crops and lead to food shortages.
Cold weather can also lead the elderly to have rheumatic problems. Constriction of the blood vessels can also cause and abrupt rise in blood pressure. Cardiac and pulmonary problems are also very common.
You contact your local National Weather Service offices. Visit the national weather service website and click on you location on the map of the U.S. This should lead you to your areas NWS office. From there there should be a place where you can submit storm reports.