DISCUSSION: With a trough of unsettled weather having made its way through the Pacific this past weekend California is hoping on what would be a third day of wet weather in a week. In what would be the equivalent of having a white Christmas, Californians are giving thanks this holidays season to the sporadic days of unprecedented precipitation.
California is already seeing a brisk morning, starting off with temperatures 5-10 degrees cooler than the previous 24 hours. Some locations in Northern California seeing 30 degree readings, but predominantly in the 40's including the Bay Area. As a frontal system approaches clouds will be on the increase today and will increase the chances for precipitation as humidity peaks over 90%. Tuesday remained relatively dry as a weak upper level ridge is short lived and then pushed by the frontal passage. The frontal passage will bring cooler temperatures likely to the 5-10 degrees cooler than the area has been seeing. The image below from Twister Data depicts the cooler air creeping into the forecasted area.
Further into the week another system is expected to push through Northern California which would bring cooler temperatures with the possibility for frost in northern locations. While too early to say, our next watchable timeframe will be into Sunday as some area in the West, in particular Wyoming and Colorado experience drastically cool temperatures into the end of November.
~Meteorologist Jessica Olsen