It's not rain, it's smog

Take a look at the radar map for the Sacramento area today:

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* Image via Weather Underground

Now usually when you look at a radar map and see green, you're thinking, "Oh wonderful! We're getting some much needed (or rather desperately needed) rain showers today!". Your thinking would be wrong in this case. What you're seeing here is the reflectivity - or in more plain words - a big stinking brown pile of smog in the air because it's hotter than the blazes of places that have hot blazes!

Over the wee