Add Yahoo as a preferred source to see more of our stories on Google. Bitterly cold arctic air has blanketed parts of the United States over the last week, with some areas getting snow and subzero ...

Forecasters warn an extreme winter storm could trigger rare “exploding trees” across the Upper Midwest as temperatures plunge below zero, causing sap inside trees to freeze and crack bark. The storm ...

When temperatures plunge and the air goes painfully still, people in northern forests sometimes hear a sharp crack that ...

Sudden or severe cold temperature can cause trees to experience "frost crack." NPR's Scott Simon talks with Bill McNee of the Wisconsin Department of Natural Resources about what happens and why. If a ...

Bitterly cold arctic air has blanketed parts of the United States over the last week, with some areas getting snow and subzero temperatures. Along with the cold weather comes a natural event called ...