You’ve seen the little orange signs warning of Frost Heaves ahead. What are they, why does NH have so many? “They are lenses of ice that have formed in the soil and they’re much more than a volume expansion of water upon freezing. When an ice lens starts to form, actually water is drawn up to the bottom of the ice lens and freezes there.” See The Weather Notebook for more detail.
You Pittsburgher’s out there, look at the BLUE sky in this photo. I’m just loving it.
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