Colors are also dependent on it's elevation. At times you can see pink, blue, and yellow.
The forecast for Wednesday was a 5 and Thursday was a 4, 10 being the most extreme.
Northern Canada got the real show. Sadly, we were at the very edge of it so we didn't see those levels.
A cool web site to watch is
here. It updates every 30 seconds and covers both ends of the world.
The purplish hues are from city lights.
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