Or, as my wife said, sun’s hot.

    • dmention7@lemm.ee
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      16 hours ago

      I was thinking the same thing, but here’s my guess:

      -Cold, foggy night/morning = frost forming

      -Cloudy until early-morning so the sun doesn’t warm the shingles

      -Clouds clear up a bit by mid-morning, and the sun rapidly warms up the shingles, leading to the frost evaporating quickly relative to the shadow’s motion