Tweakr, Cholla's 500 miles north of us in Amarillo, Texas. I blame ALL northers that blow into Austin on Amarillo's refusal to close their door!
Now... Amarillo's just a tad farther from you - to the southwest. BUT... if you pay attention to the Pacific equatorial storms, those blow up from the Mexican Pacific Coast, right thru Amarillo, onto Pennsylvania, Nova Scotia, heading straight for you!
You might not be completely wrong in blaming Amarillo for this Sven fellow, too. "CLOSE THE DOOR!"
(Albeit, a really BIG door...)
Now, for that dome idea... first, you need a balloon. Kind of a big one, too - the exact length and width of Norway, as a matter of fact. Then, tack down the edges, pour over a whole bunch of molten plastic, let them cool (that takes, uh, 2 seconds?) and then you should have a dome-effect.
Of course, if you had a really big 3D printer - !