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CNRFC Hydrometeorological Discussion

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Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
635 AM PDT Sun May 16 2021

...SHOWERS/T-STORMS CONTINUE TODAY ACROSS SIERRA AND MUCH OF NV...
...COOLER SYSTEM ON TRACK TO IMPACT REGION LATTER HALF OF WEEK...

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

The slow moving upr low has drifted across central CA...in the 
vicinity of Fresno this morning. A few areas of scattered showers 
are rotating around this feature...and once again will become more 
numerous this afternoon with increased solar insolation. Models 
indicate the best opportunity for precip will be across the Sierra 
from about Lake Tahoe southward...and then points east over the 
state of NV between I-80 and US-50. 

Over the next 24 hours...forward speed of the upr low will begin to 
increase with the core of the system reaching the Las Vegas area 
this evening and then closer to the 4-Corners region on Monday 
morning. This will bring a decrease to precip coverage and intensity 
with some lingering precip over the far southern Sierra and possibly 
southern/eastern NV.

Tuesday will be dry across the area as a positively tilted s/wv 
ridge builds over the area...between the downstream upr low and a 
deepening upr trof over the northeast Pacific. This latter system 
will impact the region from mid-week toward the end of the week as 
it sharpens and moves across the west coast. At this time...look for 
the best opportunity for precip to be across northeast CA spreading 
over northern NV. Cooler temperatures will also accompany this system 
with high temperatures on Thursday and Friday potentially 5- to as 
much as 20-degF below average for this time of year.