Hydrometeorological Discussion
Issued by NWS California-Nevada RFC
Issued by NWS California-Nevada RFC
937 AGUS76 KRSA 301335 HMDRSA Hydrometeorological Discussion National Weather Service / California Nevada RFC / Sacramento CA 640 AM PDT Thu May 30 2024 ...GENERALLY DRY CONDITIONS INTO THE WEEKEND WITH CHANCES OF PRECIP ALONG THE NORTH COAST AND SRN OR MON AS A SYSTEM MOVES THROUGH THE PACNW... ...RISING TEMPS EXPECTED MID NEXT WEEK AT 10 TO 20 DEG F ABOVE SEASONAL NORMALS... .METEOROLOGICAL CONDITIONS (THU AM - WED AM)... The upper trough from yesterday continues to move further inland to our north today as a ridge builds in over the eastern Pacific. This will result in dry conditions and warming temperatures for the rest of the week as the ridge passes over the west coast. Expecting afternoon highs away from the coast to rise to 5 to 15 deg F above seasonal normals. Another trough is then set to arrive this weekend cooling down coastal areas to below normal, but relatively high heights will keep interior CA and NV 5 to 10 deg F or so above normal through Sunday. A larger upper low will then move into the Gulf of Alaska at the end of the weekend sending a front and towards the PacNW. The southern edge of this system will move through the nrn CA/OR border on Monday. The combination of the front and upper low is expected to produce some precip over the north coast and srn OR. There is still some uncertainty on precip amounts for Monday. Ensembles have 24 hr QPF ending Tuesday ranging from 0.10" to nearly 1.25" between the GFS and ECMWF. Some of this will depend on the N/S positioning of the upper low and how far along the BC coast it travels before moving inland through the PacNW. QPF was mainly the morning WPC guidance. Highest amounts forecast over the Smith Basin at 0.50-0.75" or so and the crest of the Cascades at 0.25-0.60". Conditions will dry out again after Monday once the trough moves inland and higher heights begin to build into CA and the rest of the west. Strong ridging is expected by mid-week leading to some well above normal afternoon high temperatures (10-20 deg F). QPF graphics are available at www.cnrfc.noaa.gov/qpf.php AS $$