Sundowners... Like Santa Ana's?
Similar, but not the same. Sundowners are very local to a region with an ocean on one side and a high mountain range on the other (think Santa Barbara, CA). Behind the mountain range there needs to be a dry desert region for the temepature differential to develop between the cool moist ocean air and the hot dry desert air. The hot air comes over the mountain and gains speed and heating by compression as it slides towards the sea.
These winds only happen in the evening and late night when all conditions are correct. Weather specialist are great at seeing these conditions developing and give us a good lead time.
Another location where Sundowners develop is Lake Elsinore CA. In the early 60's a complete Hot Shot crew were overran by fire coming off the mountain in Lake Elsinore. A lot of burned folks as a result. This was before the condition was known and identified in training.
Santa Ana winds are a result of a deep low pressure off the coast, and a high pressure dome over the 4 corner states (UT, CO, AZ, NM) The pressure gradients have to be very steep between the low pressure and the high pressure. Most often that condition happens in the fall to winter. Same thing happens though, winds slide down off the mountains and gains speed and compression heating as it moves towards the coast. As said, this will be continuously for a week or less. No relief with night time, winds actually gain speed after dark.
HTH