Simplify the following text for a Grade 6 native English-speaking person.
Original: The 2010 La NiÃ a weather pattern , which brings wetter conditions to eastern Australia , was the strongest since 1973 .
Simplified: La NiÃ a is an unusual weather pattern , which brings wet weather to eastern Australia . The 2010 La NiÃ a was the strongest since 1973 .