Steve, maybe that is what happened up north, and some other type of mechanism controls wind up there. I have no idea.
It sounds like the seabreeze kicked it up a notch, if it went from 13 to 20, but I have no idea what happens up there. I just know the area around my house real well.

I believe strongly that PaG is influenced by temperature differentials b/n the Gulf and inland this time of year. The typical spring time pattern of NW winds at PaG fit the definition of sea breeze to a "T".

Today at PaG it went from NE at 5 to NW at 20 in about 5 minutes.
The typical "someone just hit the switch on the wind blower" gig.
This happened right at 12:30 when the heat of the day allowed for inland heating. The water is still only about 73 degrees, so this creates a really nice temperature gradient b/n land and gulf.

Once the land cooled, it switched pretty quickly back to the original direction of NE, but with much more power. It is still nuking at solid 20 plus out of the NE.

In my mind, when wind goes from NE at 5 to NW at 20 plus in the heat of the day, and then back again to NE as the land cools, it's most likely that the NW wind was caused by inland heating (sea breeze).
Either way, I don't care too much what people call it or what causes it.
I just like showing up within minutes or moments before a blow,rigging and riding for as long as possible.