Some Iowa post offices will be open extra hours this weekend, enabling customers to get their cards, letters and parcels in the mail. Clear Lake Postmaster Steve Woods says his office will be open both Saturday and Sunday.With this very busy time of year for the Postal Service and for customers, Woods says it makes perfect sense to offer longer window hours. He says the mail collected this weekend -will- go out.The Clear Lake office will be open from 10-to-4 both days this weekend.