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Hydrometeorological Discussion
National Weather Service / California-Nevada RFC / Sacramento CA
605 AM PDT Mon Sep 21 2026

...SCATTERED SHOWERS TODAY CENTRAL/SOUTHERN SIERRA AND SOUTHERN NV...
...LIGHT PRECIP FAR NORTHWEST AREAS LATER THU INTO FRI...

.METEOROLOGICAL CONDITIONS (MON AM - SUN AM)...

An area of low pressure is slowly drifting eastward...currently 
located near Point Conception this morning. Already some scattered 
showers associated with this feature are moving from southwest to 
northeast on the downstream side over the southeast CA deserts. By 
this afternoon...the primary circulation will be situated over the 
southern San Joaquin Valley with the best opportunity for precip 
development in the northeast quadrant of the low pressure where 
diffluent flow aloft will be best. Look for showers and t-storms 
over the central/southern Sierra and points east across southern NV. 
Into the evening and overnight hours...the low pressure will 
increase its forward speed to the northeast and exit the area over 
the UT/NV border early Tuesday. 

For later Tuesday through early Thursday...drier southwest flow will 
become the rule across CA and NV. Then by later Thursday into Friday 
a s/wv trof will reach the Pacific Northwest and clip areas near the 
CA/OR border with light precip possible mainly along the the coast 
down to Eureka...and inland over the crest of the southern OR 
Cascades. Amounts look to be near or less than 0.25-inch. Then as 
this system quickly shifts off toward the east-northeast...flow will 
once again turn southwest with a drier airmass in place. 


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.