Hydrometeorological Discussion National Weather Service / California Nevada RFC / Sacramento CA 1225 PM PDT Mon Mar 30 2026 ...COOLER AND UNSETTLED THROUGH EARLY THURSDAY... ...WARMING AND ONCE AGAIN BECOMING DRY FOR FRIDAY INTO THE WEEKEND... .METEOROLOGICAL CONDITIONS (MON PM - SUN AM)... Weak s/wv trof moving along the US/Canada border in the vicinity of the northern Rockies this afternoon...elongating back southwest to an upr low that has finally opened up and making its way eastward between 130W and 140W off the CA coast. Light precip continues to stream onshore near the CA/OR border and will persist through the afternoon and evening hours. As the offshore s/wv trof approaches the coast tomorrow...look for precip to become more widespread with the best totals along the length of the Sierra with totals somewhere between 0.50- and 1.00-inch on Tuesday. A secondary focus point of precip will be over east-central NV as the s/wv trof moves overhead with 0.25- to 0.50-inch possible. This system will then shift off toward the east on Wednesday. For Wednesday...a cool s/wv trof will make its way out of the Gulf of Alaska southeast to sweep across the Pacific Northwest and northern CA. For coastal areas...amounts will range from 0.25- to 0.50-inch over the upper Russian River basin to 1.00- to 2.50-inches over the Smith River basin. Inland over the southern Cascades down through the northern/central Sierra look for amounts of 0.75- to 1.50-inches. Freezing levels will dip with each successive system moving across the area. By Thursday morning...these will be down to 3500-feet northwest...6000-feet in the vicinity of I-80...7000- to 10000-feet for central areas...and over 12000-feet for far southern areas. Conditions will dry out and warm up for the upcoming weekend as high pressure begins to once again build along the west coast. |