The rentalcars companies are asking 600 euro+ for a car cause the rental companies have to get the cars back from 1000+km on a truck (and make extra money). Extra trains are running now from Amsterdam.
John Cleese went with a cab from Oslo to Brussels for 3800 euro
He had 3 drivers that changed seats during the trip.
I you are in Amsterdam, i can find people that will drive you for that money.
You have a radar here that shows if it's raining,
www.buienradar.nl Though there where no clouds yesterday on that rain radar is saw clouds when i looked up. The volcanao ash can't be detected on the rainradar, so it must have been the volcano ash.