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Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
825 AM PDT Wed Jun 3 2026

...WARM AND DRY THROUGH FRIDAY...
...COOLING THIS WEEKEND WITH A FEW SHOWERS SRN SIERRA/EASTERN NV...
...POTENTIAL FOR SCATTERED SHOWERS NORTHERN AREAS MON INTO TUE...

.METEOROLOGICAL CONDITIONS (WED AM - TUE AM)...

The overall pattern continues to show an upr low spinning over south-
central Canada...while upstream is a deeper more impressive system 
located in the vicinity of the northeast Pacific near 52N/145W. A 
disturbance rotating around this offshore feature has made its way 
into the general westerly flow aloft...and is currently making its 
way onshore over the Pacific Northwest and far northern CA. This has 
temporarily lowered heights over northern areas. However...a high 
pressure cell to the southwest of the CA coast near 32N/135W is 
building across the southern half of the region. This should keep 
most of the shower activity north of the CA/OR border...while 
temperatures run anywhere from plus 5- to plus 15-degF over seasonal 
normals...except the northern CA coast which will feel the greatest 
impacts from the approaching system.

As the quick moving s/wv trof moves across the Pacific Northwest and 
east of the area toward the northern Rockies tomorrow...the high 
pressure to the southwest of the CA coast will continue to build and 
peak either Thursday or Friday...bringing the warmest days to the 
region...anywhere from plus 5- to plus 20-degF over seasonal 
normals. Dry conditions are also anticipated.

For the weekend...the upr low over the northeast Pacific will begin 
to eject eastward and dig a broad upr trof along the west coast. 
This will bring a trend downward to the temperatures. Just 
downstream of this feature...showers will be possible across the 
southern Sierra into eastern NV both Saturday and more likely 
Sunday. 

Into next week...models are struggling with the depth of a system 
moving toward the west coast Monday into Tuesday. This may bring the 
opportunity for some scattered light precip over the higher terrain 
of northern CA and northern NV. However...right now...confidence is 
rather low on this scenario.

Freezing levels are currently running from 12000- to 15000-feet 
across the region. These should peak late Thursday into Friday as 
the high pressure strengthens across the region...on the order of 
14000- to 17000-feet. As the troffing develops along the west coast 
this weekend...look for a dip in freezing levels to near 8000-feet 
near the CA/OR border and 15500-feet far south. Depending on the 
next approaching system Monday into Tuesday...freezing levels will 
remain closer to 9000-feet at the CA/OR border and 16000-feet close 
to the CA/MX border.


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.