I know that the arrows for the upcoming days are an indication that's it's gonna be windy, but if there was no wind arrow chart to go off and we only had the synoptic charts, am I right in saying that the two low pressures north and inland of Perth (as it looks for friday onwards) are what we really want and what makes mega windy? Any low in the position that they will be during the weekend is good right? But double low means crazy winds?
I am on my iPhone and cannot figure out how to copy the chart onto here so you may need to take a look yourselves....
Sort of - seabreeze pattern is when the trough down the west coast moves inland and a new high starts to come in from the west. The strength of the high is a factor too.
For example Fri looks way better then Wed on todays charts
Ok, think I'm with you... Is the trough the nothing part on the chart? Kinda the void between the high an low? Once that moves inland it allows the high to enter the frame it blows. The larger ( higher the isobar no) the windier it is during the seabreeze?
The greater the Barometric pressure between the High and Low compared with the distance in Nm or K's the greater the wind should be.
Sometimes if the high is settled in the bite it can produce nothing but easterlies
I think 
Yeah the bump in the isobars on the Friday 10pm doesn't look so good, I'd like to see a 6pm one.
I think the synoptics give a more accurate representation of what might happen, if your good at reading and understanding them.
Edit...... 5 or more days away is too much time for things to change to make a good forecast.
So that bump in the isobars that doesn't look good (rider) as you say, is that the low dropping down which can kill the seabreeze? From reading th synoptic explanation this seems to be the case I think. Also, the explanation says that a low off the south coast can prevent the trough from happening which seems to be the case on Saturday...hopefully.
You can get really technical about it all but it's good to know what's happening and not just rely on those green arrows.
In shorts then, Friday could be a bit sketchy, Saturday sick...I think...maybe..
Phil that bump that was a lot worse has now changed and got better.
The way I see it is that bump changes the wind direction a bit making it more difficult for the thermal effect to work.
I figure the wind is traveling sort of parallel to the lines except that it is also trying to get from the high to the low so I then add roughly another 30 to 40 degrees to the lines.
So on the old fridays synoptic the majority of the morning wind for WA was traveling in a SE direction except for that bump over Perth which made the angle more Easterly say EESE
I then figure that this direction is harder for the thermal wind to push against creating a weaker breeze than predicted.
I also think the pressure readings taken from the various locations can vary from how many locations the readings are taken from and then the synoptic pattern is then roughly plotted out eg a map based on 100 different readings would be less accurate than one based on 1000 pressure readings.
This isn't fridays map just one i quickly grabbed this am
Also that high is a bit stronger - the last was only about 1020hpa at centre, given this is 1020 at first isobar the centre may be high 1020's, maybe 1030hpa
looking good
a factor most people forget is that the winds around the lines (isobars) dont follow the lines. they actually travel along the pressure from high to low on a approx 20 degree angle. low pressure cells inward, clockwise and up, high outward and down anti clock wise.
Looking at that map we should all be on our way to Burrum Heads!
