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    • Strong polar winds trigger thunderstorm surges as the jet stream moves south
    Frisco

    Strong polar winds trigger thunderstorm surges as the jet stream moves south

    Bronwen Cerys Posted on

    Sharp polar winds will penetrate the warm air left over from summer, triggering a spate of thunderstorms.

    A drastic change in weather awaits the US as the jet stream heads south across the western states.

    On the other side of the country, a northern loop of the jet will keep temperatures above 60°F.

    Where the two air masses collide, fireworks occur, triggering torrential rain and the threat of “severe” storms.

    Cold air collides with warm air to the southCold air collides with warm air to the south (WX maps)Cold air collides with warm air to the south (WX maps)

    Weather Channel meteorologist Johnathan Erdman said: “There will be some changes later this week.

    “Models predict the jet stream will sink southward to the west, bringing cold air from the Northwest into the Rocky Mountains and eventually parts of the Plain States.

    “At the same time, an upper level ridge of high pressure is moving into the Midwest and parts of the East, and that will bring warmer air to parts of the Ohio Valley and eventually parts of the East.

    “Where cold air meets the warmer air in front of it, we expect thunderstorms to break out, and this could bring locally heavy rain and even severe weather across parts of the central U.S.”

    NEWS FROM THE USA:

    Wind gusts where masses meet (WX diagrams)

    Gusts of wind where crowds meet

    WX charts

    Tropical storms so far (The Weather Channel)

    Tropical storms so far

    The Weather Channel

    This came after a quiet start to the week brought welcome relief from the recent spate of unsettled weather.

    Florida is suffering a double whammy from Hurricane Helene earlier this month and then Hurricane Milton.

    The cost of the two storms will total hundreds of billions of dollars in one of the largest hurricane cleanup efforts ever.

    The next two weeks will bring further weather change as cold air from the north battles the warmth of the summer heat.

    Erdman said: “Next week’s forecast shows some more changes coming.

    “Expect two cold fronts to push through – one from the Great Lakes and Midwest to the Northeast on Wednesday through Thursday, and then we expect another cold front to move into the Great Lakes later this week and into the Northeast this weekend arrives.

    “We expect high temperatures below 60°F across most of the Great Lakes and the Northeast through the weekend.”

    Cool air changes into warm air

    Cool air changes into warm air

    Accuweather

    Despite the post-hurricane calm, southeastern states remain in the firing line of further tropical activity.

    Hurricane Oscar struck over the weekend, but stayed away from the United States and caused stormy conditions in the Caribbean.

    Tropical Storm Nadine followed a similar path, bubbling in the warm waters of the Gulf of Mexico before dissipating without incident.

    However, the hurricane threat is far from over and there are warnings that the next hurricane could come without much warning.

    Jim Dale, US meteorologist for British Weather Services and co-author of “Surviving Extreme Weather,” said: “Florida and Louisiana are still getting things from the Gulf of Mexico and there is still a risk of something more uncertain coming through. “

    “There is still a lot of energy in the Gulf that will fuel these storms.”

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    Bronwen Cerys
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