席卷美国中部的风暴将引发危险的恶劣天气爆发，从周六晚上开始在平原地区展开，然后在周日席卷南部和中西部的大部分地区。
总的来说，截至本周末，超过7500万美国人处于威胁区。风暴系统带来了各种有害的天气影响，包括严重的雷暴和北部的寒风。
到周六晚上，强烈到严重的雷暴将开始在南部平原爆发，可能在夜间影响俄克拉荷马城和达拉斯等城市。非常大的冰雹和破坏性的阵风是主要的危险，孤立的短暂龙卷风也可能发生。
巴吞鲁日附近的路易斯安那州南部周六晚上处于山洪预警之下，一些地区已经经历了3.5至4.5英寸的降雨，到周日早上可能还会有1至2英寸的降雨。
周六晚至周日凌晨1点，俄克拉荷马州大部分地区都处于龙卷风警戒状态。
周日，风暴预计将移动到中西部和南部。
严重的雷暴和龙卷风可能会席卷南部和中西部的大片地区，从东德克萨斯州延伸到南部五大湖。这种恶劣的天气威胁可能会带来多轮风暴，这些风暴将在明天白天席卷上述威胁区的各个部分，并在一些地区持续到周日晚上，因为整个风暴系统继续向东席卷。
预计从阿肯色州的小石城到印第安纳州的印第安纳波利斯，最有可能发生危险的严重雷暴。在这些地区，可能会发生许多严重的雷暴，可能会带来非常大的冰雹、强烈的龙卷风和破坏性的大风。目前，强龙卷风的最大风险集中在阿肯色州东部，穿过田纳西州西部和肯塔基州，进入印第安纳州南部，包括孟菲斯和纳什维尔以及肯塔基州的路易斯维尔和印第安纳州的埃文斯维尔。
在一些地区，严重的雷暴和龙卷风的威胁将持续到晚上，使得这种威胁更加危险。
芝加哥、底特律、印第安纳波利斯、辛辛那提和克利夫兰也可能出现破坏性大风和冰雹。
周一，恶劣的天气转移到东海岸和I-95走廊，从纽约北部一路向南到塔拉哈西和新奥尔良。破坏性的风将是北部城市最大的威胁，但是不能排除一些龙卷风会席卷南部地区。
在这场风暴的北边，预计从达科他州到新英格兰，从周六到周日都会有冰雪。
威斯康辛州和密歇根州已经发布了暴风雪警告，那里半英寸厚的冰将覆盖街道、道路、树木和人行道。
此外，周六晚上到周日早上，降雨和雷暴将进入卡罗莱纳州和阿什维尔。该地区经历过野火上周由于天气干燥。
周六，从纽约到北卡罗来纳的七个州都处于高度火险之中。
伴随大雨的雷雨将断断续续持续到星期一。
Millions braced for dangerous severe weather -- including possible tornadoes
A storm sweeping across the central U.S. will trigger a dangerous severe weather outbreak that begins unfolding Saturday night in the Plains before encompassing much of the South and Midwest on Sunday.
Overall, more than 75 million Americans are in the threat zone through the end of the weekend. The storm system is bringing a variety of hazardous weather impacts, including severe thunderstorms and a wintry blast on the northern side.
By Saturday evening, strong to severe thunderstorms will begin to erupt across the southern Plains, possibly impacting cities like Oklahoma City and Dallas through the nighttime hours. Very large hail and damaging wind gusts are the primary hazards, and an isolated brief tornado could also occur.
Southern Louisiana near Baton Rouge, was under a flash flood warning Saturday evening, with some areas already experiencing 3.5 to 4.5 inches of rain with 1 to 2 more inches possible by Sunday morning.
A tornado watch was in effect for much of Oklahoma Saturday evening until 1 a.m. on Sunday.
On Sunday, the storm is expected to move into the Midwest and the South.
Severe thunderstorms and tornadoes are possible across large swath of the South and Midwest, stretching from east Texas to the southern Great Lakes. This severe weather threat will likely feature multiple rounds of storms that will sweep across various portions of the threat zone above throughout the day on tomorrow and in some areas last into Sunday night as the overall storm system continues to sweep east.
The greatest risk for dangerous severe thunderstorms is expected from Little Rock, Arkansas, up to Indianapolis, Indiana In these areas numerous severe thunderstorms could occur, potentially bringing very large hail, strong tornadoes, and destructive winds. Right now, the greatest risk for strong tornadoes is focused from eastern Arkansas, through western Tennessee and Kentucky into southern Indiana, including Memphis and Nashville as well as Louisville, Kentucky, and Evansville, Indiana.
The threat of severe thunderstorms and tornadoes will persist through the nighttime hours in some areas, making this threat even more dangerous.
Damaging winds and hail are also possible in Chicago, Detroit, Indianapolis, Cincinnati and Cleveland.
On Monday, the severe weather moves to the East Coast and I-95 corridor from Upstate New York all the way south to Tallahassee, and New Orleans. Damaging winds will be the biggest threat for northern cities but a few tornadoes cannot be ruled out across the southern areas.
On the north side of this storm, snow and ice is forecast from Dakotas all the way to New England Saturday into Sunday.
Ice storm warnings have been issued for Wisconsin and Michigan, where up to a half an inch of icy glaze will cover streets, roads, trees and sidewalks.
Additionally, periods of rain and thunderstorms will move into the Carolinas and Asheville Saturday night into Sunday morning. The areahas experienced wildfiresover the last week due to the dry conditions.
On Saturday, seven states from New York to North Carolina are under Elevated Fire Danger.
The thunderstorms with heavy rain will be on and off into Monday.
