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Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
830 AM PDT Tue May 18 2021

...COOL TEMPERATURES THROUGH THE WEEK...
...PRECIP POSSIBLE OVER FAR NRN CA/SIERRA CREST/NEVADA STARTING LATE 
TOMORROW...

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

Region is sandwiched between an eastward-moving upper low near the 
four-corners, and a deepening trough over British Columbia. Expect 
temperatures to remain below normal through the week as heights 
remain low through the period. 

Starting tomorrow, expect the upper trough to deepen and an upper 
low to track southward into Oregon. Precip associated with this 
system should begin overnight into Thursday near the OR/CA border, 
then spread into the Northern Sierra and Nrn NV Thursday. The upper 
low is expected to slowly meander southward into western NV through 
the end of the week, and precip should continue over far Nrn CA, the 
Sierra, and Nevada through at least Friday. For Friday and Saturday, 
afternoon showers and tstms are possible over the Sierra Crest and 
NV as well. The upper low finally begins to push east of the region 
by Sunday, allowing precip to wrap up and ridging over the Eastern 
Pac to rebuild. Overall, 1-1.3" precip is expected over favored 
areas of NE CA, Nrn NV, and the Sierra, with less than 0.5" 
accumulations otherwise.