Monday, 3 December 2012

The north-westerly jet

A north-westerly jet is currently blasting us with a low pressure system every few days, with each successive low that comes through ploughing in with a howling northwesterly. Sooner or later, high pressure will settle over the north Atlantic and then it'll get cold perhaps even really cold as the radiators get switched off.

that's the theory anyway...

NW'ly low #1 (the jet is running in a rough line between Iceland and Les Alpes). 

NW'ly low #2 (jet in the same place)

#3 - and note by this time the high pressure ridges between Iberia and Iceland are linking up as the jet weakens. 

Now its blocked... the jet is gone gone elsewhere and lows are stopped from coming from the west and it'll then get cold

Good for south-easterly wind mind - these kind of patterns are great when it comes to forecasting long range and long periods of south-easterly winds. With luck, swell generators will tuck a couple of long range high period swells in under the south-easterly winds and fingers crossed these might get into the midium sized range at some point

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