First off, you are not 30 days late until you are 30 days late. With a 719 score, you can expect your score to drop between 25-40 points.
Also, a 30 day late on your mortgage will cost you approx. 80-100 points off of your credit score.
Also, a big thing to be aware of is the balance to high credit limit you carry on all of your revolving accounts. Try to keep it at 30% or below on each card if possible. The high your %, the lower your score will be.
Whatever you do, pay your mortgage, car, installment loans, reovling accounts, and utilities in that order. As mortgage and car note lates carry the biggest ding on a credit report when they are late. Most utility companies do not report a late to the three major agencies - Transunion, Equifax, Experian. Until they do pay the other accounts first when money is tight.