寒冷的低温将增加美国北部的冻伤风险

在这个周末,美国北部的美国人在不受保护的情况下外出冒险,面临严酷的低温和危险的风寒,有冻伤和体温过低的风险.

Temperatures across the Midwest, Plains and Mountain West will range from 20 至 40 degrees below normal over the next five to seven days. Factor in wind gusts of 20 至 30 英里每小时, and there will be life-threatening wind chills as low as 50 degrees below zero.
Wind chills as low as -50 degrees could cause frostbite on exposed skin in as little as 10 分钟,” said the National Weather Service Office in Bismarck, 北达科他州. “Frostbite and hypothermia are likely if proper precautions are not taken when outdoors.
Wind chill advisories and warnings are in effect from Montana to Michigan this weekend and will likely be expanded in the coming days.
    When there is no wind, bodies radiates heat, creating a layer of protective warmth from the cold weather. 然而, when it is windy, that moving air breaks up that insulating layer of heat, which speeds up heat loss and allows hypothermia to set in more quickly.
    The NWS Office in Bismarck said, “a prolonged period of life threatening wind chills is expectedthis weekend and potentially lasting through much of next week.

    Pile on the heated blankets

    The coldest air will start pushing through the upper Midwest on Saturday. At least half a dozen states will see temperatures below zero on Saturday morning. Even high temperatures are expected to be 25 至 30 degrees below normal in Minnesota, 爱荷华州, 威斯康星州, Illinois and the Dakotas.
    从那里, the cold air will spread south and east.
    Another reinforcing cold front will move through the region Sunday morning,” 说 National Weather Service Office in Cleveland. “Temperatures will be the coldest so far this season this weekend into early next week with below-average temperatures lingering through next week.
    From Sunday through Thursday, Cleveland, Indianapolis and Detroit will see high temperatures 15 至 20 degrees below normal, keeping them below freezing for almost a full week.
    Starting this weekend, 芝加哥, 堪萨斯城, 密苏里州, and Des Moines, 爱荷华州, will witness temperatures 20 至 30 degrees below normal, keeping them mostly below the 20 degree mark.
    It’s not just the Midwest that will be experience this deep freeze. Southern states like Texas, Louisiana and Mississippi will also be 15 至 30 degrees below normal Tuesday and Wednesday.

    ‘It cannot be too cold to snow

    While it can be too warm to snow, it cannot be too cold to snow,” 根据 the National Snow and Ice Data Center website. “Snow can occur even at incredibly low temperatures as long as there is some source of moisture and some way to lift or cool the air. It is true, 然而, that most heavy snowfalls occur when there is relatively warm air near the groundtypically -9 摄氏度 (15 degrees F) or warmersince warmer air can hold more water vapor.
    Despite the bitter cold, there is also a chance for snow showers for portions of Iowa, Kansas and Nebraska, 哪里 2 至 4 inches is likely through Sunday.

      A low pressure system that will develop off the coast of the Carolinas will slide up the East Coast Sunday. The system’s proximity to the New England coast will determine whether many northeastern cities get rain or snow.
      The system will intensify as it tracks off the Eastern Seaboard and has the potential to bring another round of significant snow across the mid-Atlantic and parts of the Northeast,” said Dave Hennen, a CNN meteorologist. “There is currently a lot of uncertainty in where/who will get the most snow and whether the major metro areas in the Northeast get hit.

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