Signs and portents

Lest you think I have gone all Popstrological, I should say that I found this little anecdote of Phil Plait's poignant and slightly unsettling. Plait has just seen a particularly pretty sun halo and points it out to an acquaintance:

I showed her the halo too. Her reaction was not what I expected.

She gasped, looked at it for a moment, and then asked me, “What does it mean?”

I gawked at her for a second. “What do you mean, ‘what does it mean’?” I asked.

She looked right back at me. Her tone was more plaintive. “What does it mean?” she repeated.

“It doesn’t mean anything,” I replied. “It just is.”

She watched me for a moment, then turned back to the sky. I waited for her to say something more, but when she didn’t, I began walking back home again, leaving her to try to extract some sort of purpose from a random event.

I'd be tempted to say "It means it's going to rain soon," as this is what sundogs and haloes traditionally portend to sailors and the like, and as portents go they are moderately accurate. But this perhaps wouldn't be a sufficiently satisfying meaning.