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  2. Michigan braces for prolonged deep freeze as dangerous ...

    www.aol.com/michigan-braces-prolonged-deep...

    Expect the deadly deep freeze that has overtaken Michigan ― and most of the country — to continue through early next week, when weather forecasters say temperatures may finally "get warmer ...

  3. Frost line - Wikipedia

    en.wikipedia.org/wiki/Frost_line

    The frost line—also known as frost depth or freezing depth—is most commonly the depth to which the groundwater in soil is expected to freeze. The frost depth depends on the climatic conditions of an area, the heat transfer properties of the soil and adjacent materials, and on nearby heat sources.

  4. Polar vortex to blast 30 states with life-threatening cold ...

    www.aol.com/polar-vortex-blast-us-life-115624040...

    The deep chill will be felt as far as the Deep South, with only South Florida escaping the icy grip of the arctic blast. 7 Ways To Prevent Frozen Water Pipes In Bitterly Cold Temperatures.

  5. Arctic Outbreak To Blast Frigid Conditions Into South ... - AOL

    www.aol.com/arctic-cold-outbreak-blast-south...

    An outbreak of arctic cold is sweeping through the Midwest and East, as well as into the Deep South and this frigid pattern is expected to last into the third week of January. Where the cold is ...

  6. Permafrost - Wikipedia

    en.wikipedia.org/wiki/Permafrost

    Permafrost temperature profile. Permafrost occupies the middle zone, with the active layer above it, while geothermal activity keeps the lowest layer above freezing. The vertical 0 °C or 32 °F line denotes the average annual temperature that is crucial for the upper and lower limit of the permafrost zone, while the red lines represent seasonal temperature changes and seasonal temperature ...

  7. Keweenaw Waterway - Wikipedia

    en.wikipedia.org/wiki/Keweenaw_Waterway

    The Keweenaw Waterway is a partly natural, partly artificial waterway which cuts across the Keweenaw Peninsula of Michigan; it separates Copper Island from the mainland. Parts of the waterway are variously known as the Keweenaw Waterway, Portage Canal , Portage Lake Canal , Portage River , Lily Pond , Torch Lake , and Portage Lake .

  8. Polar vortex headed for US will bring ‘exceptionally cold ...

    www.aol.com/polar-vortex-headed-us-bring...

    Lake Michigan and Chicago pictured. EPA. ... Most Americans don’t realize how much money you can make right now. Food. Food. Southern Living. I'm a food editor, and this is the only pre-shredded ...

  9. Black River (Cheboygan County) - Wikipedia

    en.wikipedia.org/wiki/Black_River_(Cheboygan_County)

    Black River is a 78.8-mile-long (126.8 km) [2] river in the U.S. state of Michigan, flowing mostly northward through four Northern Michigan counties: Otsego, Montmorency, Presque Isle, and Cheboygan. The Black River flows into the Cheboygan River at 45°36′13″N 84°27′47″W  /  45.60361°N 84.46306°W  / 45.60361; -84.46306 ...