The models keep showing that the mid-latitude cyclones is moving into that region where the polar vortex should be. that means the region is still to warm for it to develop.
In milder UK winters its the polar vortex that drive the jet-stream and mid-latitude cyclone intensity. This pushes the warm sector of the the mid-latitude cyclones deep into northern Europe during the coldest parts of the year.
This is what we currently have
This is what we would want to have
Last edited by Adrian Brattle on Wed Oct 12, 2011 11:04 pm, edited 2 times in total.
I honestly can't make head nor tail of it, and I am not trying to be rude when I say that. You obviously love the weather BUT why can't you just involve yourself with what this site is all about, loving our plants?
Most wanted list - Any Young Trachycarpus and/or fern.
Tom2006 wrote:I honestly can't make head nor tail of it, and I am not trying to be rude when I say that. You obviously love the weather BUT why can't you just involve yourself with what this site is all about, loving our plants?
Its simple! H=High pressure, L= Low Pressure, purple = Jet stream. i'm just trying to show the affect of the PV
Adrian, you need help with your English. Most of the time I don't mind bad grammar, but when the post involves long words, for it to have credibility it needs to read as though it wasn't written by a weather-obsessed chimpanzee.
I suggest you change what you wrote to this:
The weather forecasting models keep showing that mid-latitude cyclones are moving into the region where the polar vortex should be. This means that the polar region is still too warm for the polar vortex to develop.
It's the polar vortex that drives the jet-stream and the intensity of the mid-latitude cyclones that pushes the warm sector of the the mid-latitude cyclones deep into northern Europe during the coldest parts of the year.
Therefore, due to the mid-latitudal cyclones disrupting the polar vortex which drives the jet stream, this approaching winter could be colder than normal.
Dave thank, I know. As Adrian only ever seems to talk about weather I had no option but to ask him about his garden, unless you would like me to start a separate thread on the plant forum asking him?
Most wanted list - Any Young Trachycarpus and/or fern.
Last edited by Dave Brown on Thu Oct 13, 2011 12:52 pm, edited 1 time in total.
Reason:Removed your previous posts as the forum rules apply to you as well
eddie wrote:What do you mean by polar vortex? And how and why does that have an effect on the pressure systems?
In Star Trek the Borg used a vortex for time travel
Edit: ok, googled the polar vortex. But I still am curious about the effect it's supposed to have on weather systems...
During a mild winter there is a strong vortex over the north pole, near the top of troposphere. This vortex rotate anti-clockwise. The high stratospheric wind rotating round the vortex strengthens the jet-stream, sucking in low pressure systems into the arctic.
As Adrian only ever seems to talk about weather I had no option but to ask him about his garden, unless you would like me to start a separate thread on the plant forum asking him? 
