Flash Floods: Why Are They So Dangerous?
1:35
(CNN) ––
Millions of people across the southeastern US are under threat from severe weather conditions, including heavy rains and possibly isolated tornadoes, throughout the night this Wednesday.
Heavy rains with potential flash flooding are forecast to hit the Tennessee Valley to Kentucky.
This includes the greater Nashville area, which was heavily impacted by weekend flooding.
Temperature swings, floods and warnings: the weather in the US will be like a roller coaster this week
More than 39 million people from Louisiana to the Mid-Atlantic could experience severe storms.
The major impacts of severe weather will be the destructive straight-line winds from the Gulf Coast to the Carolinas.
However, there is also the potential for isolated tornadoes with these storms.
Once severe weather passes, temperatures will drop below freezing overnight.
In that sense, there is possibility of snow from Appalachia to New England.
Communities continue to recover
The recent extreme conditions forecast comes after a storm that killed at least seven people and caused widespread damage in the Nashville area last weekend.
advertising
The heavy rains caused flash floods that swept cars into currents that were impossible to avoid.
In addition to damaging dozens of houses and buildings.
To the south, the cities of Alabama and Georgia are still clearing debris from last week's terrifying tornadoes, killing six people.
A tornado struck a home in Historic Newnan, Georgia, on March 26, 2021.
Precisely, the tornadoes damaged dozens of homes and businesses in both states.
In Alabama, the Eagle Point community witnessed roofs dislodged from houses, trees were pulled from the ground, and power lines were laid on roads.
In Coweta County, Georgia, the city of Newnan was hit by a powerful Category EF-4 tornado overnight.
Residents heard the sirens call 15 to 20 minutes before it arrived, residents told CNN.
The storms killed at least one person in the county, Fire Chief Deron Patrick Wilson said.
This is hard to believe.
I think of this kind of thing when you look out over the Midwest, in Oklahoma.
I think we'll see the same kind of damage here, ”Wilson said.
Hot and cold air masses create chaos
Meanwhile, some parts of the country experience wide fluctuations in weather conditions in a short period.
Puerto Rican family survives tornado in their basement 2:42
A cold air mass in the west, coming from Canada, collided with warm air as it moved east.
What created winds that exceed the force of a hurricane in some areas.
Wind gusts of 127 km / h were recorded on Monday in Hettinger County, North Dakota, just south of Dickinson.
In addition, a part of this front along with winds caused the fires in South Dakota.
In Aberdeen, South Dakota, a high of 27 degrees Celsius was recorded on Monday, 0.5 degrees above normal.
After the winds pushed the cold air mass, temperatures barely reached 4 degrees.
The NWS Weather Prediction Center tweeted:
“It may sound like an April Fools joke, but we assure you that the cold temperatures in Friday's forecast are not a joke.
Daily records in the eastern US may be broken as lows drop 10-15 degrees below normal to -6-1 degrees, while parts of the south could experience a late frost.
It may look like a late April Fool's prank, but we assure you the chilly temps in Friday's forecast are no joke.
Daily records over the eastern US may be broken as lows dip 10 to 15 degrees below normal into the 20s and 30s while parts of the South could experience a late freeze.
pic.twitter.com/tGCK8qCA1M
- NWS Weather Prediction Center (@NWSWPC) March 30, 2021
Below-average temperatures will mark the weather in the eastern United States on Wednesday in the wake of a cold front.
Except for one last warm day in eastern New England.
As that cold front passes, temperatures will drop dramatically as well.
More than 21 million people will be on a freeze alert or warning from the central Mississippi Valley to the Ohio Valley on Thursday and Friday mornings, when temperatures will be above -6 degrees.
Frost advisories and advisories are in effect for cold air expected Thursday and Friday morning.
The temperature will be cool enough for lake effect snowfall to occur in some areas of the Great Lakes.
“The core of cold air (in the atmosphere) will stretch over Lake Michigan tonight into the early hours of Thursday, which brings us into April.
It is not very often that we talk about lake snow in April, but this will be one of those periods, albeit brief, "explained the National Weather Service office in Chicago.
Winter weather will also hit again across the West Virginia Appalachians, the eastern Great Lakes and parts of New England between Wednesday and Thursday nights.
Between 6 and 8 inches of snow is expected in western and northern New York, with lower totals elsewhere.
Meanwhile, in the western US, temperatures are above average in the middle of the week.
But, in the end, that warmer air will move east to reach the center of the United States.
Generalized high temperatures of 5-15 degrees above average are forecast for this Friday from the west to the Great Lakes.
The northern plains will be warmer compared to normal, with temperatures up to 1 degrees above average.
Temperatures will continue to rise through Easter weekend, with highs that could break records of up to 4 degrees warmer than average in the northern plains.
By the end of this weekend, heat is forecast from coast to coast, except in parts of the Northwest and Florida.
CNN's Jackson Dill contributed to this report.
Bad weather
