Hydrometeorological Discussion National Weather Service / California Nevada RFC / Sacramento CA 640 AM PDT Thu Mar 26 2026 ...WARM AND DRY THROUGH THE WEEKEND WITH ABOVE NORMAL TEMPS... ...A SHIFT TOWARD COOLER AND WETTER TO END MARCH AND START APRIL... .METEOROLOGICAL CONDITIONS (THU AM - WED AM)... An upr ridge continues to be centered in the vicinity of west Texas this morning...while a weak disturbance making its way across the northern tier of the country has flattened the flow a bit over the western US. This will allow for temperatures to drop a bit today...but still remain above average for this time of year in the range of plus 5- to plus 20-degF...with the highest anomalies across the southeast CA deserts and lowest anomalies near the CA/OR border and northern NV. For Friday through the weekend...heights will once again build across the region with temperatures warming for one last time this exceptionally dry and warm March. Look for well-above average high temperatures peaking either Saturday or Sunday in the range of plus 10- to plus 25-degF over seasonal averages. Finally by Monday...the pattern will shift with the last two days of March bringing in cooler temperatures and the potential for precip...especially across northern areas. The upr ridge over west Texas will flatten and shift off toward the east...while flow across the west coast becomes more west to southwest. On Monday...look for a s/wv trof to make its way across the Pacific Northwest and clip northern CA with expected light precip. The initial system is not looking as impressive at the latitude of CA and NV...and as a result...amounts were trimmed from the previous forecast by approx 0.10- to 0.25-inch across northern CA. For Tuesday...an upr low spinning well west of the CA coast will open up and eject a s/wv trof toward the region with a more favorable trajectory and better chance of precip mainly over northern and central CA then shifting across the northern half of NV. This system looks to bring anywhere from 0.25- to 0.75-inch of precip from the Shasta Lake drainage down the length of the Sierra. Freezing levels in these areas will also drop down to 6500- to 8000-feet. Beyond the forecast period...another disturbance is expected to make its way toward the west coast on Thursday into Friday with cooler temperatures and a final round of precip for the upcoming 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. |