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Here is a GOES visible image from today, 2019-12-01 about local noon, around Nova Scotia. Note the parallel trains or streaks of clouds, running approximately northwest to southeast.
A few hours ago, the wind was from the NW at 30-40kph (at Halifax); for the past 3 hours it's been from the NNW at about 25kph.
What's the physics behind the streaking? Is it simply cumulus clouds from convection being blown downwind?
The species is Stratocumuls undulatus Sc un.
They can form for example when cold, dry air moves over a warmer ground layer. A sharp wind shear at the boundary layer blows these waves. (Wikipedia on Sc).
They are not to be confused with Sc radiatus or yet another form, the so-called "cloud streets", which form along the wind direction.
My wild guess would be windshear at a low level inversion. Cold calm air below, warm windy air above, with clouds forming at the inversion. Could be checked with a look at an atmospheric sounding with wind, temperature and due point curve from the area and the time ... Cartoon for visuals
