In the warm sector aims in on the Bay Area from a southwesterly direction. A strongģ00mb jet usually 100-150 knots aims in on California's Central coast while the low level jet In from the subtropics usually near the Hawaiian Islands where the term gets its name. In this type of rain event, a steady stream of moisture feeds The so-called "Pineapple Express" situation falls Scenarios include stalling frontal boundaries. Stronger Pacific storms can bring rainfall extended over two or three days time that in worst case Less rainfall than the western Santa Cruz Mountains during the winter storm season. States found in Quillayute, WA on the NW tip of the Olympic Peninsula with 101.56" rain annually.Īs in the case of Sequim, WA though in a much less extreme sense the Santa Clara Valley sees substantially The town is merely 75 miles away from one of the wettest areas in the 48 contiguous Sequim is clearly a perfect example of sitting within a regional This site receivesĪ remarkable total considering the amount isn't much more than the annual total of Los Angeles, California To the northeast in the lee-side of the same mountains lies Sequim. Hoquiam which sits on the southwestern-facing slope of the Olympic Mountains receives nearly 70 inches of rain The most significant example of a rain shadow is found near the flanks of the Olympic Mountains in Western Washington. There are many instances of this on the West Coast, most notably the precipitation differences between the west slope of the Sierra Nevada (Blue Canyon, Truckee, California) versus the drier and colder side of the Sierra (Reno, NV). This has the effect of drying the air massĪnd limiting precipitation totals as seen in many winter rain events in the Santa Clara Valley. Warms as it moves down the opposite side of the range. On the other side of the coin is the leeward side of these mountain ranges where the air descends and Strong warm air advection events, the low level jet can act like a conveyor belt supplyingĪ steady stream of moisture that can result in flooding rains or in colder situations "white-out" As this air cools and condenses, precipitation results. Will often encounter the mountain range at a near perpendicular angle allowing for a maximized As the Santa Cruz Mountains face roughly west-southwest, the low level jet Windward or western flank of the north-south running ranges often will see much more precipitation whether "Rain shadowing" refers to the effect mountain ranges can have with respect to precipitation. Of significant "rain shadowing" in the lee side of the Santa Cruz mountains. The rainfall discrepancy between the two locations (Santa Cruz - 30.78" / San Jose 15.08") is the result The southern Santa Clara Valley (San Jose area). Would first cross Santa Cruz before heading northeast over Moving in off the Pacific Ocean following the typical west-southwest direction of most winter storms, you Santa Cruz and San Jose are a more interesting pair to observe. San Francisco and Oakland have bodies of water just to their west where rain Mountains and its northern location that lies in closer to the path of the polar Santa Rosa and the North Bay typically receive the most rain, aided by orographic lifting from the nearby Is an important topographical fact that comes into play during the region's rainy season.Īnnual rainfall in the Bay Area ranges tremendously by location including: Peaks making up the highest rises in the mountain range lie just to the southwest of San Jose. This includes several prominent peaks including: Just to the south and west rising to nearly four thousand feet above sea level is the Santa Cruz The elevation rises to nearly 300 feet above sea level around The topography of the Santa Clara Valley includes flatlands a few feet above sea level near the innerīay waters. The name refers to the many tech corporationsĪlso located in the valley is San Jose, the Bay Area's largest city with a population of more thanĩ00,000 and recently passed Detroit to become the nation's 10th largest city. Located to the southeast of San Francisco. Perhaps better known as "Silicon Valley" to those living outside the area, the Santa Clara Valley is The Santa Cruz Mountains Effect on Precipitation Forecasting for the Santa Clara Valley
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