No. I want to know when the southerly will arrive.Seems nobody has understood it. Try describing it in a bit more detail.
Are you only interested in "southerly" weather fronts?
How far in advance do you want notice?
How precise do you expect the timing to be?
What if there isn't a "southerly" in the forecast for the next day or two; do you want it to say "nothing to see here" or give you the expected conditions?
Or current obs?
Do you still want it to give you multi-day forecasts?
There are lots of questions people ask about the weather. The more data the user interface tries to pack in the harder it is to see the data clearly. So presenting data such that you can see what you want without having to ask anything is complicated.