The Irish Times is reporting that "The Irish Aviation Authority (IAA) has extended the closure of Irish airspace until 1pm tomorrow due to the deterioration in conditions caused by ash from an Icelandic volcano." They will reevaluate the situation again tomorrow.
The Raw roster is currently in Belfast, Northern Ireland for tonight's show in the city. As mentioned earlier WWE plans on booking a chartered plane to get the talent to New Jersey for Monday's Raw. With the volcanic ash getting worse, who knows if they will be able to make it or not.
It would probably be a good idea to tell all of the fans that come to today's show that if they can't get out tomorrow that they should come on back to the building on Monday for a Raw taping (as long as the building is not in use otherwise).