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AGUS76 KRSA 121428

HMDRSA



Hydrometeorological Discussion

National Weather Service / California Nevada RFC / Sacramento CA

830 AM PDT Tue Mar 12 2024



...WEAKENING SYSTEM WITH PRECIP TAPERING OFF TODAY...

...LOW PRESSURE OVER THE LWR COLORADO RIVER BASIN LATER THIS WEEK...



.METEOROLOGICAL CONDITIONS (SHORT TERM: TUE AM - FRI AM)...



A s/wv trof is currently making its way onshore across the Pacific 

Northwest and northern CA this morning...as a sfc front is falling 

apart as it drops southward across the region with the best radar 

returns weakening over central CA. Precip will dissipate throughout 

Tuesday as the system moves inland...and then the overall pattern 

begins to amplify as a strong area of high pressure builds just off 

the west coast and expands northward into western Canada. At the 

same time...the s/wv trof moving inland today will dig southward 

through the Great Basin and form a cutoff low near the CA/NV/AZ 

triple point. This will set up a relatively dry north to northeast 

flow across the region with the only opportunity for scattered light 

precip near the NV/UT border and then down across the lower Colorado 

River basin. 





.METEOROLOGICAL CONDITIONS (LONG TERM: FRI AM - MON AM)...



High pressure over the north and central portions of the region and 

an upper low centered around the NV/CA/AZ border Friday and wobbles 

around there as it weakens Saturday into Sunday. Models and ensemble 

members vary on exact track of the low and how long the low will 

stick around into early next week.  Some members move it farther 

south and east Sunday. A few showers and isolated thunderstorms 

rotating around the low are possible over far Srn NV and Srn CA 

(especially over the desert and north and east slopes) mainly on 

Friday and Saturday. PW values around a half an inch over the south. 

Precipitation amounts expected to be around a tenth of an inch or 

less Friday and Saturday. Freezing levels generally around 10,000 ft 

in NW CA and around 5000-7000 ft over Srn CA and NV Friday and 

Saturday and rising to around 7000ft-9000 ft over Srn CA and NV on 

Sunday. 





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







Kozlowski/Osborne



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