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AGUS76 KRSA 181425

HMDRSA



Hydrometeorological Discussion

National Weather Service / California Nevada RFC / Sacramento CA

730 AM PDT Sat May 18 2024



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

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

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



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



An upper ridge remains over the eastern Pacific flanked on either 

side by two upper lows as a trough approaches the PacNW. The trough 

will move through WA later today as the eastern most upper low heads 

towards CA. This will set up a troughing pattern over the region 

today continuing a cooling trend keeping coastal areas below normal 

while beginning to ease temperatures inland. Most of northern CA and 

NV will likely remain about 5-10 deg F above seasonal normals for 

today. Additionally, this pattern will allow for chances of 

showers/thunderstorms over the central/southern Sierra and into NV 

this afternoon/evening. QPF amounts should be fairly light at 0.10" 

or less with locally 0.25-0.50" possible under thunderstorms. The 

trough over the PacNW will dig deeper into the west coast the rest 

of the weekend eventually merging with the offshore upper low into 

Monday. This will keep the western U.S. in a troughing pattern early 

next week allowing for temperatures to cool down closer to seasonal 

normals with many areas even 5+ deg F below normal.



Additional systems are forecast to drop into the PacNW throughout 

the week keeping the offshore high pressure at bay and allowing for 

cooler weather to persist the rest of the period. An upper low 

moving into WA/OR on Weds may result in some light showers across 

the northern regional border Weds and Thurs with otherwise dry 

conditions anticipated. Any resulting showers are not expected to 

generate much precip (less than 0.10").



Freezing levels generally 10-13 kft across the region with 

occasional lowering to 5-8 kft across far nrn CA/srn OR and nrn NV 

as systems pass to the north.





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







AS



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