According to the article, the pipeline that leads there isn't running at 100% capacity and they have local environmental laws that prevent them from using other sources.

We had a similar thing happen a year or so ago here in Phoenix - a pipeline was damaged and we had some slowdown in delivery. We actually had plenty of fuel in the storage tanks outside of town, but more trucks were being used to cover for the ruptured pipe so there were fewer to do delivers. One afternoon, a station in central Phoenix ran out of gas. Of course, it made the news at rush hour, and everyone stopped on their way home to fill up causing a massive surge in demand. Several other stations then ran out.

The frenzy lasted a few days then people got a clue and went back to normal purchase cycles and all was good. Same thing will happen here I expect.