Hydrometeorological Discussion National Weather Service / California Nevada RFC / Sacramento CA 640 AM PDT Thu Apr 23 2026 ...MOSTLY DRY CONDITIONS FOR THURS/FRI BEFORE SHOWERS AND BELOW NORMAL TEMPERATURES RETURN FOR THE WEEKEND... .METEOROLOGICAL CONDITIONS (THU AM - WED AM)... Dry conditions across the region today in between systems. Yesterday's trough continues to exit further inland while another approaches CA from the west. Troughing will move overhead this weekend from offshore as another descends from the PacNW. This is expected to generate scattered showers across the region, though mainly over the Sierra and eastward into NV as well as Shasta. Thunderstorms possible over nrn/central CA and across to NV. Expect temperatures to cool dropping down to -5 to -15 deg F below seasonal normals over the weekend. The trough will exit the region late Sunday/Monday as another low approaches from offshore. Some differences regarding the positioning and movement of that low between the models, but either way does not look like that one will produce any significant precip. Morning forecast was mainly the morning WPC guidance. Nearly all the precip is expected for Saturday and Sunday mainly concentrated east of the valleys. QPF: 0.10-0.75" Sierra, 0.30-1.25" Shasta/srn/central NV, and a few hundredths to 0.15" over coastal srn CA. Freezing levels 9-11 kft through Friday lowering statewide to 6- 8 kft over the weekend. As the system exits, expect levels to rebound back up to 8-11 kft Monday. 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. |