A perfect circular rainbow around the sun around 1:00 PM. Those are cirrostratus clouds - about 3-6 miles high, made of ice crystals because the temperature in the troposphere is around -15 degrees Fahrenheit! As light from the sun passes through the ice crystals within the clouds, it reflects as the full spectrum of light. Usually means rain is on its way (forecast says thunderstorms). I know sun halos are not that rare but I've never seen one before -I was so excited & so were my students! I love teachable moments that are not on the lesson plan.
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