Isaac has strengthened to a hurricane and is still heading for the Gulf Coast, forecasters said. Isaac's maximum sustained winds are 75 mph.

Areas now impacted:

Louisiana:

70001-70397    70452              70458 - 70461
70469 70707    70718
70721 70723    70725
70728 70734    70737 - 70738
70743 70763    70769
70774 70776    70778
70780 70788    70792

70500 - 70706   70710   70712 - 70715
70719   70722   70726 - 70727
70729 - 70732   70736   70739 - 70740
70747 - 70753   70755 - 70762   70764 - 70767
70770 - 70773   70775   70777
70782 - 70787   70789 - 70791   70801 - 70898

Mississippi:

39426 - 39595

Carrier message: Severe weather due to Tropical Storm Isaac is causing some unavoidable service delays in Louisiana. No pickups, deliveries, or On-Call Pickup^® service are available in the ZIP Codes listed below.

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