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February anticyclonic spells favour retrogression?


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Posted
  • Location: Irlam
  • Location: Irlam

    I made this post 7 years ago

    I have noted from looking at the weather archives that notable anticyclonic spells during February have a tendency to favour retrogression. As always, there are exceptions to the rule.

    Some examples.

    According to Philip Eden, the three most anticylonic Februarys since 1880 are 1932

    Rrea00119320218.gif

    The high moves northwards allowing a cold easterly flow

    Rrea00119320228.gif

    1965: a classic

    Rrea00119650217.gif

    The start of a cold wintry first half to March

    Rrea00119650226.gif

    1934

    Rrea00119340217.gif

    A wintry end to a pretty snowless winter

    Rrea00119340226.gif

    Other examples

    1890

    Rrea00118900219.gif

    Rrea00118900228.gif

    1909

    Rrea00119090220.gif

    Rrea00119090228.gif

    1924

    Rrea00119240220.gif

    Rrea00119240228.gif

    1942

    Rrea00119420217.gif

    Rrea00119420222.gif

    1944

    Rrea00119440220.gif

    Rrea00119440227.gif

    1993

    Rrea00119930216.gif

    Rrea00119930227.gif

    2004

    Rrea00120040220.gif

    Rrea00120040226.gif

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    Posted
  • Location: Powys Mid Wales borders.
  • Location: Powys Mid Wales borders.

    2008 didn`t quite make it but it was a glorious spell of weather,with plenty of overnight ar frosts and chilly to cold easterly days perfect.

    http://www.wetterzentrale.de/pics/archive/ra/2008/Rrea00120080213.gif

    http://www.wetterzentrale.de/pics/archive/ra/2008/Rrea00120080214.gif

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    Posted
  • Location: Windermere 120m asl
  • Location: Windermere 120m asl

    It depends on the position and potency of the Jetstream, an amplified flow enables the high to retrogress either NE or NW, a flatter jet tends to sink the high..

     

    Late February into March can often see a rather meridional jet flow with amplification so its perhaps no surprise to see the evolutions that occur. Even the infamous mild euro high of Feb 1998 ended with a northerly and cold start to March.

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