两场风暴正在袭击美国，一场给东海岸带来暴雨，给中西部带来暴雪，另一场给西部带来雨雪。
由于天气恶劣，700多架进出美国的航班被取消。
东海岸风暴
东海岸风暴首先席卷南方，从俄克拉荷马州到佛罗里达州带来了雷暴、破坏性大风和至少10次龙卷风。据州官员称，密西西比州有三人死亡。
风暴现在正以每小时70英里的速度席卷海岸。
周三晚上8点之前，弗吉尼亚州和北卡罗来纳州的部分地区一直处于龙卷风警戒状态，下午6点之前，弗吉尼亚州和马里兰州的部分地区发布了严重的雷暴警戒
暴雨和雷暴将在下午穿过大西洋中部，傍晚到达东北部。山洪暴发、树木倒塌和停电都是可能的。
纽约市应急管理部门警告说，纽约市将在晚高峰时段遭受重创，降雨量可能达到1英寸，局部地区可能会发生洪水。
“如果你在一个容易发生洪水的地区，提前做好计划，”该部门在社交媒体上说。"如果旅行，要格外小心和花时间."
在中西部和五大湖区，同样的风暴系统给爱荷华州和密歇根州带来了暴风雪警告。大雪和时速超过50英里的阵风的结合将会在道路上造成危险的白茫茫的情况。
“车辆堆积如山，能见度几乎为零，”爱荷华州巡逻队说。"我们呼吁所有人:除非绝对必要，否则不要出行!"
到下午，威斯康星州的部分地区和密歇根州的上半岛可能会有1到2英尺的降雪。
明尼阿波利斯市下了9.5英寸的雪，成为冬季最大的暴风雪。
明尼苏达州州长蒂姆·瓦尔兹宣布进入和平时期紧急状态，并授权该州国民警卫队给予支持。
“给犁地者工作的空间，”明尼苏达州巡逻队说。"慢下来，系好安全带，抛开杂念。"
西海岸风暴
与此同时，从周三到周五，第二场风暴袭击了从加州到南达科他州的西部11个州。
从加利福尼亚到落基山脉可能会有一到三英尺厚的积雪。
包括洛杉矶在内的南加州预计会下雨。山洪不会造成大的威胁，但是在野火烧伤的区域可能会有泥石流。
Whiteout conditions hit the Midwest as thunderstorms threaten East Coast
Two storms are targeting the country, with one bringing heavy rain to the East Coast and blizzard conditions to the Midwest, and the second dropping snow and rain in the West.
More than 700 flights have been canceled within, into or out of the U.S. amid the severe weather.
East Coast storm
The East Coast storm first tore through the South, bringing thunderstorms, damaging winds and at least 10 reported tornadoes from Oklahoma to Florida. Three fatalities were reported in Mississippi, according to state officials.
The storm is now barreling up the coast with winds that could reach 70 mph.
A tornado watch is in effect for portions of Virginia and North Carolina until 8 p.m. on Wednesday, and a severe thunderstorm watch was issued for portions of Virginia and Maryland through 6 p.m.
The heavy rain and thunderstorms will move through the Mid-Atlantic in the afternoon and reach the Northeast by the evening. Flash flooding is possible, as well as toppled trees and power outages.
New York City -- which will get hit hard during the evening rush hour -- could see up to 1 inch of rain and localized flooding, the city's emergency management department warned.
"Plan ahead if you're in an area prone to flooding," the department said on social media. "If traveling, take extra care and time."
In the Midwest and the Great Lakes, the same storm system is bringing a blizzard warning from Iowa to Michigan. A combination of heavy snow and wind gusts over 50 mph will create dangerous whiteout conditions on the roads.
"Vehicles are piling up, and visibility is nearly zero," the Iowa State Patrol said. "We urge everyone: DO NOT TRAVEL unless absolutely necessary!"
Parts of Wisconsin and the Upper Peninsula of Michigan could see 1 to 2 feet of snow by the afternoon.
Minneapolis picked up 9.5 inches of snow, making it the biggest snowstorm of the winter season.
Minnesota Gov. Tim Walz declared a peacetime emergency and authorized the state's National Guard to give support.
"Give plows room to work," the Minnesota State Patrol said. "Slow down, buckle up and put distractions away."
West Coast storm
Meanwhile, a second storm is hitting 11 states in the West, from California to South Dakota, from Wednesday through Friday.
One to 3 feet of snow is possible from California to the Rocky Mountains.
Rain is expected in Southern California, including Los Angeles. There's not a major threat for flash flooding, but there could be debris flow in wildfire burn scar areas.
