Bonnie is strengthening as it moves westward at about 15 mph and away from Nicaragua and Costa Rica. The storm formed Friday morning from a tropical disturbance the National Hurricane Center has been tracking for a little more than a week as it moved from the central Atlantic to the Caribbean. Heavy rainfall is the biggest threat to Central America as Bonnie continues westward. It could become a hurricane early next week far south of Mexico, but those winds should remain offshore. Flooding rainfall will be a risk in Nicaragua and Costa Rica as this system intensifies. Rainfall totals of 4 to 8 inches are expected, but local amounts could be close to 1 foot. The Weather Company’s primary journalistic mission is to report breaking news about weather, the environment and the importance of science in our lives. This story does not necessarily represent the position of our parent company, IBM.