Hydrometeorological Discussion National Weather Service / California Nevada RFC / Sacramento CA 550 AM PDT Tue May 19 2026 ...WARMING TREND TO END THE WEEK... ...MAYBE A PM SCATTERED SHOWER OVER THE SIERRA CREST THU-SUN... .METEOROLOGICAL CONDITIONS (TUE AM - MON AM)... The week continues with troffing over the interior of the western US while an upr ridge across the eastern Pacific moves slightly closer to the west coast...nudging the overall pattern just a bit to the east. This slight adjustment in the flow regime will bring increasing temperatures to the region through the end of the week with afternoon highs reaching plus 5- to plus 15-degF over seasonal averages...except along the immediate coast where marine influence will keep conditions in check. Models are hinting at the possibility of some afternoon build ups or even some very scattered showers over the crest of the Sierra from Thursday onward. Low confidence in this occurring as moisture is quite limited. At this time...the 19/00Z EC is the most bullish with this scenario. Freezing levels starting this morning close from 7000- to 8000-feet over eastern NV to 10000- to 12000-feet along coastal locations. As the high pressure ridge over the eastern Pacific moves closer to end the week...look for these to reach anywhere from about 12500- to 14000-feet. 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. |