If you don't already know, orographic enhancement is the increase in rainfall caused by clouds getting pushed up mountains by wind to higher, colder less atmospheric pressure altitudes, There the water vapor more easily precipitates out as rain. It is also seen at a lesser scale as the wreath of clouds around the top of a mountain.
Around here, I'm most used to seeing the effect indirectly, in the decrease in rain totals the farther a weather station in San Luis Obispo is from the Irish Hills.
However, last Friday, I experienced it more directly. 2 others and I were on a trip from San Luis Obispo to Santa Barbara CA in my truck. To save a little time, I took CA 154 along Lake Cachuma to San Marcos Pass and then down into SB. We traveled in rain most of the time.
The red part of the trip was along the base of the north side of the Santa Ynez range. Along there, precipitation was mostly drizzle.
As soon as we went through San Marcos Pass and started descending the south side if the range (the blue part), we were in fog (the clouds pushed up against the moountains) and the precip changed to fat raindrops.
We had just discussed orographic enhancement while passing by the lake, and why that affected the runoff into Lake Cachuma so it was pretty cool to actually experience it.