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Domenica, 16 Novembre 2014 00:00

Tides and the Jan 5th storm 2014 In evidenza

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Tides and the Jan 5th storm 2014

 

 

In this post I look at how exceptionally strong tides over the first few days of January 2014 could have played a role in the severe storm that hit the UK on the 5-6 January.

 

Meteociel.fr provide twice daily (midnight and midday) pressure maps of the polar regions which show how the polar Jet Stream changes rather well. The Atlantic storms last winter were all spawned in a region near off Nova Scotia where warm tropical air meets cold polar air creating instability. Did high spring tides play a role in triggering these storms? The video below shows an animation of the horizontal tractional forces acting on the Jet Stream as spring tides sweep through the Atlantic. Maximum spring tides were experienced 3-6 January which also led to coastal flooding on UK shores.

Early january saw the strongest tides of 2014. The figure below shows the relative magnitude of the combined solar/lunar gravitational tides. At the equinoxes spring tides at new moon and full moon  tend to be roughly equal, whereas in winter it is new moon tides that dominate. The chart below was prepared by Roberto Madrigali
TIDES-STORM-AND-RAIN2014

If we look in more detail at the January storm we see that large tides sweeping across the Atlantic may have affected the unstable convergence of warm tropical air and cold polar air east of Canada. This was where the very low pressure January storm was spawned.>>>>>>>>

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Letto 2680 volte Ultima modifica il Domenica, 16 Novembre 2014 18:16

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