I've always wanted to see the Aurora Borealis, but never had the opportunity, since it is so rarely visible in my area (Pennsylvania).
However, last week was apparently a rare opportunity of exceptional visibility.
Unfortunately, I missed my opportunity, as I did not find out about it until the next day.
Are there any good resources or strategies for anticipating opportunities like this? Are coronal mass ejections like the one that precipitated this event predictable? If so, are such predictions available to the amateur public?
Answer
I use Twitter user Aurora_Alerts and its corresponding RSS feed to make aurora alerts show up in my RSS reader (which happens to be Opera).
Aurora_Alerts posts messages like In 53 minutes the Aurora should be Quiet 2.33 Kp and 31 minutes the Aurora should be at 'STORM' LEVEL! It's On!! 7.33 Kp (Kp is related to the K-index which quantifies disturbances in the horizontal component of earth's magnetic field with an integer in the range 0-9 with 1 being calm and 5 or more indicating a geomagnetic storm.).
SpaceWeather is a source for following the general state of the Sun and alerts of coronal mass ejections (CMEs), but it may not be updated frequently enough to get alerts in time (and it is quite tedious to keep checking it).
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