One of our Forum members pointed out to me a difference in terminology regarding the winds we have here in California.
I appreciate the opportunity to clarify regarding California's annual winds:
There is a lot of conflicting information out there regarding California's annual wind cycle.
These winds are called (sometimes a bit interchangeably) "Santa Ana winds", "Diablo winds", "Sundowner winds", and are often given other less well-known names as well.
Some references describe Santa Ana and Diablo winds both as offshore winds. Other references state that Diablo winds are onshore, and Santa Ana winds are offshore.
Still other references suggest that the name "Diablo winds" is a name specific to the winds that blow off the Diablo mountain range, located in the San Francisco Bay Area, of which Mt. Diablo is one of the primary peaks.
Other references suggest that the annual winds that occur in the entire Northern California area are often called "Diablo winds".
Other references state that the term "Santa Ana winds" was used generally for the entire state of California, until October 1991, when a fast moving fire in Oakland, Ca., burned 3,000 homes and killed 25 people. At that time the name for Bay Area winds was changed to "Diablo Wind" to differentiate Bay Area winds specifically from Santa Ana winds generally.
And, over time (since the 1991 fire, probably) the definition of where "Diablo winds" occur has changed and evolved, as well, as such things do. What once seemed to refer to the winds around the Diablo Range specifically, are evolving to refer more generally to a "Devil wind" ("Diablo" being Spanish for "Devil") in the northern part of the state.
Here is one reference (there are dozens, maybe hundreds, to be found on this topic):
https://en.wikipedia.org/wiki/Diablo_windSince most people, particularly in my area north of Sacramento, still use the term "Santa Ana" to describe our annual winds here I have kind of just stuck with that.
The correct term, of course, for these kinds of winds would be a Katabatic, or Catabatic wind.
"A katabatic wind (named from the Greek word katabasis, meaning "descending") is a drainage wind, a wind that carries high-density air from a higher elevation down a slope under the force of gravity. Such winds are sometimes also called fall winds; the spelling catabatic winds is also used." As you can see from the above graphic (Note: I am in the "Central Valley", as shown in the graphic), both Santa Ana winds and Diablo winds (Diablo winds as currently defined) originate in the Great Basin.
It is an interesting topic, I think.
I confess that I grow a bit weary posting fire information, partly because (especially now) there are so many terrible fires burning up and down the west coast (with no end in sight), and partly because I grow depressed and weary with all that is going on - not just these fires.
I'm hoping that by posting this wind information it may help people to better understand what is going on here that don't live out here. I have often found that people really don't believe the high temperatures we have out here and the fact that our dry season can last from April to November. Those that live in areas of cooler temperatures and higher precipitation have a different weather experience.
My goal is to always provide accurate information on here, even when the fire news is bad
.
Thank you for giving me the opportunity for clarification.
Best wishes,
Anne