David49

Oregon isn't prone to high pressure areas any more than other places in the U.S.  We have droughts in all parts of the country.  Because the west coast has a wet season and a dry season if high pressure moves in during our wet season it really affects our annual totals.  Our summer dry season is a function of our geographic location.  The rest of the country has precipitation year round so when a persistent high pressure area moves in it can be offset by rain the rest of the year.