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    Freezing Fog Grounds London Flights

    By By Jim Andrews, Accuweather.com senior meteorologist
    December 26, 2012, 2:38:55 AM EST

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    At least 170 flights in London have been cancelled and others delayed after a shroud of icy-cold fog settled over much of England on Wednesday.

    At Heathrow Airport, about 150 flights were canceled, with more than 20 more being scrubbed at London City Airport, the BBC News website said.

    The flight disruptions at Heathrow began Tuesday evening as visibility dropped to a few hundred yards, then lasted well into Wednesday. Heathrow Airport and London City Airport weather observations showed visibility as low as 100 yards overnight.

    Visibility rose before midday; however, flight cancelations were continuing, owing to a knock-on effect.

    The trouble at London airports was reflected by delays at some regional airports elsewhere in the U.K.

    The thick, icy fog was set up by cold high pressure, giving fair skies and light winds. This allowed water to condense as the damp, already cold air chilled further after sunset Tuesday.

    Temperatures bottomed early Wednesday at 25 degrees at Heathrow and at 26 degrees at London City. The normal high on Dec. 11 is 38 degrees at Heathrow.

    Beginning Thursday, increasingly unsettled, even stormy, weather will spread over the U.K. Although it will end the threat of freezing fog, it could lead to severe winds and excessive rainfall on Friday.

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