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 Understanding the weather

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DVM64



Posts : 32
Join date : 2014-08-08

PostSubject: Understanding the weather   Sat Dec 20, 2014 5:18 am

Looking at Met Office surface pressure charts for Monday and they show multiple cold fronts over the Uk. Logic says the temps will drop when a cold front arrives but it is shown that temps are going to rise. Any weather guru's out there that can explain this.
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Alx



Posts : 92
Join date : 2014-10-30
Location : Bristol. We've got a harbour too.

PostSubject: Re: Understanding the weather   Sat Dec 20, 2014 7:53 am

I love questions like this... study But it ain't a short answer..  Smile

You're logic is correct in normal circumstances, but you've picked a couple of days where unusual stuff seems to be going on.

I think the key is to look either side of Monday for a bit of context and know what the jet stream is up to, after all it's the jet stream that drives our weather - those high altitude, high speed winds that push everything along.

On Sunday this is forecast:
Summary is - High pressure near Azores, warm front off west coast of Ireland. Low pressure near Iceland, cold fronts north and west of Scotland.
So, warm air in a blob in the mid-Atlantic behind H1037 and cold air over Faroes/Iceland


This is then driven by the jet stream which on Monday is in this position:
See how it's oriented almost perfectly West/East, barely any element of North/South?


Consequently, the cold front gets strung out (pulled lengthways) and struggles to push southwards - the high pressure blocks it and the jet stream offers no North/South assistance - so the cold air remains in the North, but the warm front passes over the UK from West to East - the warm blob being helped by the jet stream - and so the temperature goes up:


At least, that's what i reckon's going on.

EDIT: oh, worth knowing that the warm or cold air sits behind the line, with the line symbols being on the leading edge.
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Der



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Join date : 2014-02-26
Location : Glynneath

PostSubject: Re: Understanding the weather   Sat Dec 20, 2014 9:50 am

Fair play !!

great answer that Smile

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DVM64



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PostSubject: Re: Understanding the weather   Sat Dec 20, 2014 2:32 pm

Thanks Alex your reply was thought provoking, I guess the bit that still puzzles is........"A cold front is the boundary between warm air and cold air and is indicative of cold air replacing warm air at a point on the Earth's surface" i.e. ground level and this is where temperatures are measured. "The presence of a cold front means cold air is advancing and pushing underneath warmer air. This is because the cold air is 'heavier' or denser, than the warmer air. Cold air is thus replacing warm air at the surface. The symbols on the front indicate the direction the front is moving." With the jet stream operating at 10 or 11 kilometers + I can buy into that it provides a very large share of shaping our weather but this is happening at ground level. I could just be being real dumb and the answer is "of course the temps are higher in front of a cold front because the cold air hasn't arrived yet" DOH!!!!
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Alx



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Location : Bristol. We've got a harbour too.

PostSubject: Re: Understanding the weather   Sat Dec 20, 2014 3:25 pm

DVM64 wrote:
"of course the temps are higher in front of a cold front because the cold air hasn't arrived yet" DOH!!!!

You've hit the nail on the head!
Nothing "real dumb" about it though.. it's a eureka! moment.  Very Happy

Temp forecast for Monday:
Look how the boundary between different temperatures aligns with the fronts in the last image from the previous post.

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Alx



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PostSubject: Re: Understanding the weather   Sat Dec 20, 2014 3:42 pm

Just found a lovely zoomable and animated map where you can choose different data types - wave, wind,precipitation..

http://www.theyr.com/Index.asp
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DVM64



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PostSubject: Re: Understanding the weather   Sat Dec 20, 2014 6:02 pm

Yep that's good so book marked it, like these overview weather sites. another one that maybe of interest is http://earth.nullschool.net/#current/wind/surface/level/orthographic=-21.43,42.87,1024 It has no values and doesn't take account of local land mass deflection. But as an interactive way of seeing anywhere in the world its pretty good
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