Hydrometeorological Discussion National Weather Service / California Nevada RFC / Sacramento CA 650 AM PST Tue Jan 20 2026 ...DRY CONDITIONS THROUGH MID WEEK AS HIGH PRESSURE REMAINS OVERHEAD... ...SLIGHT CHANCE OF SHOWERS OVER SRN CA & THE SRN SIERRA THURS/FRI AS A LOW PASSES BY OFFSHORE... .METEOROLOGICAL CONDITIONS (TUE AM - MON AM)... High pressure will keep dry conditions across the region through mid week. Troughing just west of the current upper ridge will split off into an upper low west of CA into Wednesday. This system is then progged to move south offshore the rest of the week before weakening and heading inland through Baja into the weekend. As the low passes Point Conception Thursday, expect some scattered showers over the southern Sierra and across srn CA through Friday. There are still disagreements between the GFS/ECMWF though they've come closer together since yesterday. The GFS is now on board with dropping showers out of the low late this week instead of keeping things dry and timing looks more in synch as well. As the low opens into a trough and moves through Baja late Friday/Saturday additional troughing will descend into NV/CA from the PacNW/intermountain West keeping the eastern half of the region under a troughing pattern. Meanwhile another strong upper ridge will build in over the eastern Pacific over the weekend returning dry conditions to end the forecast period. Amounts still expected to be fairly minimal at 0.10" or less for most areas seeing precip and locally 0.10-0.25". Freezing levels 10- 12.5 kft through mid week lowering the rest of the week down to 8-10 kft Thurs and 6.5-9.5 kft Friday. Levels rising west to east into the weekend and lowering over NV down to 5-7 kft. Please Note: This product may NOT be routinely updated. Please refer to the following product issued by the CNRFC www.cnrfc.noaa.gov/Daily-Briefing for a graphical summary of weather and hydrologic conditions. |