A relatively common weather pattern that brings southwest winds to the Pacific Northwest or California along with warm, moist air is often called the Pineapple Express. The name comes from the source of the moisture: The tropical Pacific Ocean near Hawaii, where pineapples are grown.
The Pineapple Express sometimes produces days of heavy rain, which can cause extensive floods. The warm air also can melt snow in the mountains, further aggravating flooding.
During the colder parts of the year, the warm air can be cooled enough to produce heavy, upslope snow as it rises into the higher elevations of the Sierra Nevada or Cascades.
And in ONE WINTER California’s dreaded drought situation has been almost eliminated. Just one of the most incredible things I’ve observed this Winter.