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AGUS76 KRSA 171434

HMDRSA



Hydrometeorological Discussion

National Weather Service / California Nevada RFC / Sacramento CA

730 AM PDT Fri May 17 2024



...GRADUAL COOLING FROM W TO E INTO NEXT WEEK...

...ISOLATED SHOWERS/T-STORMS OVER THE SRN SIERRA INTO NV SAT, 

OTHERWISE NO ORGANIZED THREAT OF PRECIP FOR THE REGION...



.METEOROLOGICAL CONDITIONS (FRI AM - THU AM)...



An upper low to the southwest of CA along with a trough passing 

through the PacNW has pushed the offshore upper ridge further out to 

sea. This will allow for some gradual cooling to kick off today as 

the retrograding ridge makes way for disturbances to move across the 

region. Models show a deepening trough into the PacNW over the 

weekend eventually expanding to cover most of CA/NV with the upper 

low just to its southwest. There is still no threat of organized 

widespread precip with this troughing, but some afternoon/evening 

showers/thunderstorms will be possible over the southern Sierra and 

into NV on Saturday. This pattern shift will also gradually cool 

temperatures from west to east starting today with coastal areas 

below normal while interior CA and NV remain 5-10 deg F above normal 

today and tomorrow. Most areas are expected to see temps drop down 

to 5-10 deg F below normal by Monday as the trough takes over and 

then swings eastward through CA/NV. This may result in some 

additional showers over the southern Sierra and into NV along with 

isolated thunderstorms.



On Tuesday, another low will travel through BC bringing troughing 

back into the PacNW as high pressure attempts to shift closer to the 

coast. The approaching low will block the ridge from moving back in 

keeping temperatures near to below normal the rest of the forecast 

period. As the low digs into the PacNW mid-week the system may 

produce a few light showers along the northern CA/NV borders, but 

nothing significant. Higher freezing levels 10-13 kft for most of 

the region through the period with occasional lowering over far nrn 

CA/NV down to 7-9 kft.





QPF graphics are available at www.cnrfc.noaa.gov/qpf.php







AS



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