Alabama is home to several major surface flows, including the Tennessee River, the Black Warrior River, and the Alabama River. There are numerous reservoirs and dams throughout the state, including the Lewis Smith Lake Dam and the Martin Dam. The climate in Alabama is generally warm and humid, with frequent rainfall throughout the year. The state's hydrology is influenced by several factors, including the Appalachian Mountains to the north and the Gulf of Mexico to the south. Major tributaries to Alabama's rivers include the Cahaba River, the Coosa River, and the Tombigbee River. Snowpack is generally not a significant factor in Alabama's hydrology, although there have been occasional snowstorms in the northern part of the state.