Hydrometeorological Discussion National Weather Service / California-Nevada RFC / Sacramento CA 645 AM PDT Wed Sep 9 2026 ...ABOVE NORMAL TEMPERATURES THE NEXT COUPLE DAYS... ...SCATTERED SHOWERS/T-STORMS WED AND THU SOCAL MTNS AND SRN SIERRA... .METEOROLOGICAL CONDITIONS (WED AM - TUE AM)... High pressure has shifted westward over the past 24 hours and is now centered near the 4-Corners region...and will be the dominant feature over the next couple days. This will bring above normal temperatures to much of the region with afternoon anomalies running anywhere from plus 5- to plus 15-degF over seasonal normals both today and Thursday. Also...elevated moisture over southern CA has advected northward and made its way over central CA as well. The 09/12Z KNKX RAOB continues to show a very impressive PW value of 1.80-inches. And now...the 09/12Z KOAK RAOB has recorded a PW value of 1.12-inches...about double this time yesterday. Once again...with ample moisture in place and daytime heating...look for scattered showers and t-storms to develop mainly over the coastal mountains of southern CA with some activity beginning to creep over the southern Sierra. Thursday looks to be the better day for convective development over the southern Sierra...primarily right along the crest. By Friday...a couple disturbances dropping southward along the AK and BC coast will rotate toward the Pacific Northwest...flattening the high pressure cell over the Desert Southwest. This will begin a cooling trend through the weekend into next week with much of the precip chances remaining near the CA/OR border on Saturday into Sunday. As this s/wv trof moves inland toward the northern Rockies...flow will remain cyclonic across the west coast with dry conditions setting up for much of next week. 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. |