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CNRFC Hydrometeorological Discussion

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Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
740 AM PDT Fri May 14 2021



The transition to cooler with scattered precip will begin today as a 
couple disturbances just off the Pacific Northwest coast phase and 
form an upr low over northern CA. Then through the weekend...this 
system will drop southeast before shifting off toward the east as it 
reaches the Las Vegas area later Sunday. Best potential for precip 
looks to be over the crest of the Cascades/Sierra and then points 
east across the state of NV mainly between US-50 and I-80. Amounts 
will vary with likelihood of convective precip each afternoon or 
early evening...but there could be some localized amounts ranging 
from 0.50- to 1.00-inch. However...most basin average totals will 
remain near or less than 0.25-inch. Along with this inland 
precip...a deepening marine layer may generate some light amounts 
along the immediate coast from the SF Bay Area down through 
portions of southern CA.

Into next upr trof will move toward the northeast Pacific 
before spreading across the west coast for the middle of the week. 
The most recent models do show some differences in the depth of this 
system and resulting precip. GFS is on the shallow end of the 
solutions...while the EC is a bit deeper. For now...the latest 
forecast spreads precip across the CA/OR border region...and down 
the length of the Cascades/Sierra along with points east over the 
state of NV...especially the northeast portion.