You really need to provide some clearer information.

I assume that you booked a non-refundable rate on the Hilton.com website? If so and the hotel is in the path of the storm (reasonably), then I would calmly call Hilton back and explain that your concern of the hurricane led you to not travel. But lets be realistic....if you didn't travel to Northern Virginia because there was a lot of rain then I think your out of luck.

You made a business decision when you booked a cheaper rate that was non-refundable. Personally I don't understand why hotels have started offering these rates in the past few year.....I think it just leads to greater potential for upsetting customers....I've watched people who had overnight flights cancelled arrive a day late and been told that their 5, 7 or whatever day prepaid stay was no longer valid since they didn't arrive on the proper date. Needless to say that was an ugly conversation and I agree with the customer that he paid for 5 days and if he chooses not to use the first one that is his choice.

Anyway, in the future if it involves flying book the fully flexible rate......Personally there have been very few times that I've booked a non-refundable rate and mostly it was during the same week and I was already in the area.

Good Luck (if you were staying in the path of the storm, if this is just an excuse then you made a bad decision).