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Hydrometeorological Discussion
National Weather Service / California-Nevada RFC / Sacramento CA
615 AM PDT Tue Aug 11 2026

...COOLING EARLY THIS WEEK WITH BELOW NORMAL TEMPERATURES STARTING 
THURS...
...CHANCES OF SHOWERS/T-STORMS OVER THE SIERRA, SE CA, AND NV...

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

The region remains between two areas of high pressure, one to the 
east over the Four Corners and one out west over the eastern 
Pacific. Troughing is developing in between along the coast of the 
PacNW and nrn CA. Monsoon moisture continues to rotate in towards SE 
CA and srn NV, satellite and lightning detection already show storms 
over AZ near the SE CA border. Models predict moisture and 
instability moving over the region, particularly in the 
afternoons/evenings, through the work week generating showers and 
thunderstorms over the Sierra, se CA, and much of NV. Additionally, 
the high pressure over the Four Corners will drift further eastward 
throughout the week as the high pressure over the eastern Pacific 
expands towards the Gulf of Alaska allowing troughing to further 
develop along the west coast. This should finally break the streak 
of above normal temperatures, first with gradual cooling the next 
couple of days then widespread below normal temperatures are 
expected starting Thursday. Anomalies then generally between -5 and 
-10 deg F with pockets of -15 deg F.

Freezing levels 14.5-15.5 kft today dropping to 13-15 kft late in 
the 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.