My buildings power went out for a few hours so at first I thought this was a big one and had an 'Oh sh!t moment', but it's back on now.
Supposedly, with G5 storms, an aurora can be viewed as far south as Florida and Southern Texas, which is crazy. From the sources I've seen we're likely to remain at a G4, but a low end G5 is possible.
Wasn't the Aurora Borealis famously visible from Singapore at some point in the 1910s?
That was actually the Aurora Australis, the Southern Lights, although the report of its being seen in Singapore is somewhat disputed.
It's believed that the southernmost sighting of the Aurora Borealis was in Honolulu in 1859.