Fog being reported in Cheyenne. Light snow being reported in Sterling. Patchy areas of freezing drizzle as well mainly east of I-25 and north of I-70 so far. All of this despite nothing or mostly nothing on radar. Why? This cold air mass is very shallow. No more than several thousand feet deep. The radar beam is actually pointed aloft and not on the ground. So, any snur flurries or freezing drizzle (frizzle) are falling below the radar beam and not being detected. Radar 101 lesson for the day. K

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