Too low air pressure to fly
Norwegian Carrier Widerĝe has had to cancel several flights in the northern part of Norway today due to air pressure being below 946 hPa - which apparently is the certification limit for some of their aircraft (WF fleet consists mainly of DHC-8 variants).
Not a very common occurrence....
Unfortunately I'm not allowed to post URLs or pictures yet, but you can find the story at the website of the Norwegian national broadcaster NRK (.no).