Tugmistress

12-Jan-09, 21:08

anyone interested in the weather? lol ok that's a stupid question, most people in the world are interested to one degree or another. I know i have had several emails/pm's from people wanting weather stations and various forecasts, would anyone be interested in learning a little about the charts? i'll do this thread this week and see what happens.

I have spotted this in the charts for sunday 18th january, as it's monday it is highly likely to change, but which way???? for the worse or for the better? the aim of this thread is to try and explain in simple terms (i'm not the best endowed with brains) how i read the charts and do you all the forecasts/warnings etc.

the image below was taken from todays 12z (noon) charts, these have seemed the most accurate charts to go by for this location. all i use this chart for is the barometric pressure lines - the tighter they are the stronger the wind. 'T' is the centre of a low and 'H' is the centre of a high pressure. (hey it's a german site and i don't speak german so can someone educate me why the letter 'T'?)

when you have spotted the UK, you will see a very low low off to the northwest, the numbers on the lines represent the barometric pressure at sea level. (the higher your altitude is also a case of lower barometric pressure than sea level as there is not the 'stack' of air above you to compress it if that makes sense?)

the centre of the low is at 940mb (mb = millibars) and the line that is shown to cross us is at 980mb.

over time looking at my records i estimate the average barometric pressure here to be around the 995mb, so at 980mb it is still a low pressure to us here. one of the things this means is tides will be higher than published on tide tables... boat owners will be aware of this phenomenom.

the gap between the lines is what defines the wind speed, the smaller the gap, the steeper the gradient from one number to the next, the faster the wind speed.... looking at 'our line' (the 980mb) the gap is fairly large between it and 975mb, this sort of size says to me gusts of up to around 30mph, i only learnt this through looking at the current charts and reading what my anemometer was reading for actual speeds and you soon learn what gap represents what sort of speeds. if, as the week progresses and the centre of the low moves nearer to us, and stays at the same intensity, you can see the lines nearer the centre are closer together, therefore the wind speed will be greater... this is the sort of thing i watch for and then warn you all about a few days beforehand.

as for the colours on this particular chart, i have not got a clue lol

http://community.dcmag.co.uk/photos/tugmistresss_gallery/images/938623/original.aspx

does anyone want me to carry this thread on? anyone interested in learning a new hobby? if so are you interested in the temperature charts? what can i help you with? i'll try my best and answer any questions :D

I have spotted this in the charts for sunday 18th january, as it's monday it is highly likely to change, but which way???? for the worse or for the better? the aim of this thread is to try and explain in simple terms (i'm not the best endowed with brains) how i read the charts and do you all the forecasts/warnings etc.

the image below was taken from todays 12z (noon) charts, these have seemed the most accurate charts to go by for this location. all i use this chart for is the barometric pressure lines - the tighter they are the stronger the wind. 'T' is the centre of a low and 'H' is the centre of a high pressure. (hey it's a german site and i don't speak german so can someone educate me why the letter 'T'?)

when you have spotted the UK, you will see a very low low off to the northwest, the numbers on the lines represent the barometric pressure at sea level. (the higher your altitude is also a case of lower barometric pressure than sea level as there is not the 'stack' of air above you to compress it if that makes sense?)

the centre of the low is at 940mb (mb = millibars) and the line that is shown to cross us is at 980mb.

over time looking at my records i estimate the average barometric pressure here to be around the 995mb, so at 980mb it is still a low pressure to us here. one of the things this means is tides will be higher than published on tide tables... boat owners will be aware of this phenomenom.

the gap between the lines is what defines the wind speed, the smaller the gap, the steeper the gradient from one number to the next, the faster the wind speed.... looking at 'our line' (the 980mb) the gap is fairly large between it and 975mb, this sort of size says to me gusts of up to around 30mph, i only learnt this through looking at the current charts and reading what my anemometer was reading for actual speeds and you soon learn what gap represents what sort of speeds. if, as the week progresses and the centre of the low moves nearer to us, and stays at the same intensity, you can see the lines nearer the centre are closer together, therefore the wind speed will be greater... this is the sort of thing i watch for and then warn you all about a few days beforehand.

as for the colours on this particular chart, i have not got a clue lol

http://community.dcmag.co.uk/photos/tugmistresss_gallery/images/938623/original.aspx

does anyone want me to carry this thread on? anyone interested in learning a new hobby? if so are you interested in the temperature charts? what can i help you with? i'll try my best and answer any questions :D