ironically, for SE qld the seabreeze website does not factor in seabreezes, but just the prevailing winds, or so it seems we've been noticing this for the last couple of springs summer periods

its possaboo, its possaboo weve had two unforecasted 21 knotters in the last week here on the gc when a 10-15 was forecast

i don't think it's hot enough yet for good seabreezes. but thursday next week is maybe starting to look better. the bom is very good at picking seabreezes on moreton bay.

at the moment we will get a few light seabreezes around 10 knots late and maybe a little stronger (15 knots) after 3pm. the rest of the time will be the southerlies/northerlies/westerlies etc.

most of the good wind at the moment is system driven. ie. northerlies, southerlies, westerlies. they are created by the pressure gradient between the highs and lows as they move west to east across australia. the higher the gradient the stronger the wind.

very basically,

wind is the result of the change in pressure over a given distance.
usually the pressure difference between high and low systems reacting against each other.

Unfortunately A "high" by itself won't produce much wind due it's surrounding stable atmosphere so it means good fishing weather. however a decent size high will most likely result in very good seabreezes if the temp difference between the ocean and land are high.

unlike a high, a "low" by itself can produce wind, because they tend to have a large pressure gradient across a short distance and typically are the result of an unstable atmoshpere. a cyclone is an example of this.
Cyclones typically need warm water temps above 26.5 deg and thunderstorms to form. you also need SE trades below the monsoonal band and NW trades above the monsoonal band to really fire things up and get the rotation flowing. cyclones tend to travel SE in direction once formed.

from checking vandos gps data overr 4 years and cross referencing that back against the bom archive charts it seems to get 25knot plus seabreezes we need a dirty big high over us and a big difference between water temp and land temp. (10 deg celsius) look at the forecast temps in ipswich for a guide. i am going to pay more attention this summer and also look at water temps.

i have tried to find a magic chart to let me know what seabreeze strengths are associated with particular temp differences but have had no luck.

Ive been saving my GPS data since Jan 05.
I generally always take my gps so I can see how much I have sailed in a year. 2005 was a great for us (in brizzy) with both SE and NE wind.
I can also look at the data to see how how strong the wind was.
We had allot of NE 25+ knots in 2005. But since then the wind has been on the decline with 2 seasons of poor SE and the NE never really got above 20knots let hope this year better.

Gestalt it would be interesting comparing the water temp from 05 to now.

ta vando

hi swoosh,

i reckon good seabreezes next week.

seabreaze is forecasting temps around 28deg but the bom is saying 32.

the bom stuff also said seabreezes are strongest when we have a nw wind feeding things along in the morning and that is also the forecast.

looks good.