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CNRFC Hydrometeorological Discussion

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Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
825 AM PDT Mon Jul 26 2021

...ACTIVE CONVECTIVE PATTERN OVER SIERRA AND HIGHER TERRAIN OF NV 
AND SW CA NEXT SEVERAL DAYS...
...WIDESPREAD SHOWERS PORTIONS OF SRN CA AND NV TODAY AND AGAIN BY 
NEXT WEEKEND...

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

With high pressure aloft over northern NV and low pressure aloft off 
the Baja California coast, generally SE flow aloft is advecting 
moisture across much of the region.  Minor disturbances aloft over 
southern CA/NV are contributing to numerous showers and a few 
lightning strikes over southern CA this morning, and a few showers 
and thunderstorms have been noted over far southern NV and NE CA as 
well.  Following the moisture advection and disturbances aloft, 
shower activity is forecast to spread north across much of southern 
NV and the Sierra by this afternoon and evening, while activity 
should gradually diminish over southern CA during the same period. 
For Tue-Thu, expect sufficient moisture/instability for continued 
shower activity for the Sierra and portions of far northern CA, much 
of NV, and SW CA higher terrain as well.  However, with less forcing 
aloft, expect the shower activity to be more diurnally-driven during 
this time frame.  By Fri into the weekend, expect additional 
moisture advection into the southern portion of the region, with 
more widespread showers expected across the Sierra, much of NV and 
portions of southern CA.  WPC guidance was used heavily in the QPF-
generation process.