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Continental Isobar Tightening And Cold Pulses?


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Posted
  • Location: Sunderland
  • Weather Preferences: cold
  • Location: Sunderland

Here's a question i've always wondered about, why do the isobars often tighten during north-easterlies/easterlies in the continent, and give a cold pulse of air, reflected by much lower dam values and 850's.

Why don't they tighten in w'lies to give a cold pulse of air, or n'lies?

Rrea00119910207.gif

Rrea00119870113.gif

Rrea00119790215.gif

Yes, the isobars do not really tighten in some of those images, but there IS a cold pulse of air in SE England and the Benelux on each one- what causes this? \

Thanks in advance, IF :)

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Posted
  • Location: Purley, Surrey - 246 Ft ASL
  • Weather Preferences: January 1987 / July 2006
  • Location: Purley, Surrey - 246 Ft ASL

I would imagine it is because it is a continental feed.

This means that the cold air does not get "mixed out" with milder air as happens over a long sea track and this maintains the cold pool.

A Northerly or Westerly has a lot of open water to cover and this has an effect on the upper air temps.

?????

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Posted
  • Location: Leeds/Bradford border, 185 metres above sea level, around 600 feet
  • Location: Leeds/Bradford border, 185 metres above sea level, around 600 feet

Continental air is inherently colder and thus becomes very unstable on the south side side of the ridge because of the Jet Stream to the south providing moisture.

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