Precipitation and Southerly Wind

To show the relationship between precipitation and southerly winds over our domain of study, I present the following figure:

I first noticed that the occurrence of southerly winds on days with precipitation (>=0.1mm/day) is amplified around topographic features. This makes physical sense, however, because these features will work to channel winds more northward as a result of up-slope orographic lifting.

Also important to note is the seemingly lack of a positive relationship between these variables along the western portions of our domain. This could be a sign of the main, north-to-south gulf surge corridor being further east, or simply an artifact of my data processing and calculations. Both are possibilities, but based on my knowledge thus far of the characteristics associated with surges, I believe some confidence can be given to the first assumption.

-jamie