Hydrometeorological Discussion National Weather Service / California-Nevada RFC / Sacramento CA 645 AM PDT Sat Jun 20 2026 ...SCATTERED SHOWERS AND T-STORMS OVER FAR N CA, N SIERRA, N NV TODAY... ...WARMING TEMPERATURES EARLY TO MID NEXT WEEK, ADDITIONAL SCATTERED SHOWERS T-STORMS TUES/WEDS... .METEOROLOGICAL CONDITIONS (SAT AM - FRI AM)... Troughing overhead and mid level moisture/instability will continue to generate chances of scattered showers and thunderstorms over far nrn CA into the nrn Sierra and nrn NV this afternoon/evening. Instability will lessen tomorrow for most of CA as an offshore ridge pushes closer to shore. Models do have some remaining over parts of NV. High pressure will drift overhead early next week bringing drier air into the region along with warming temperatures. Afternoon high temperature anomalies expected at +5 to +15 deg F away from the coast through at least mid week as 500 mb heights remain high. Mid level moisture looks to return early to mid week as high pressure over MX rotates this moisture and instability into se CA starting Tuesday. The GFS also has additional mid level moisture/instability over the CA/OR border, parts of the Sierra, and nrn NV Tuesday afternoon/evening. This means the return of scattered showers and thunderstorms, mainly Tuesday/Wednesday. Still chances for far srn CA Thursday as well but diminishing as that pattern pushes further inland. Towards the end of the current window, a large upper low looks to approach from the Gulf of Alaska. This should act to cool temperatures back down to seasonal normals from west to east as the system draws nearer. It could potentially result in some light showers next weekend as well, though it is still early. 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. |