Your Weather Questions Answered - OPTICAL EFFECTS What is the Fata Morgana? Why does the moon appear large in the distant horizon? Have you ever noticed how the horizon turns a bright red and orange color during fall sunsets? Is there such a thing as ‘Snowbows’? What causes double rainbows? What caused the colors that I saw in the clouds? How come the moon sometimes has a halo around it? What makes the different colors of a rainbow? I saw a faint rainbow, but no rain. Is this possible? What is the green flash that occurs near sunset? Why is the sky so blue in September? What is the Aurora Borealis? Categories Your Weather Questions Answered Snow Wind & Wind Chill Thunderstorms Optical Effects Weather Forecasting WHAM Weather Book Read It Online Download PDFs: Color | B&W