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AGUS76 KRSA 081435

HMDRSA



Hydrometeorological Discussion

National Weather Service / California Nevada RFC / Sacramento CA

730 AM PDT Wed May 8 2024



...WARMING THROUGHOUT THE WEEK AS HIGH PRESSURE BUILDS OFFSHORE...

...GENERALLY DRY CONDITIONS ASIDE FROM ISOLATED SHOWERS/T-STORMS 

OVER NV THURS, THE SIERRA AND NV FRI AFTN/EVE & SUN/MON... 



.METEOROLOGICAL CONDITIONS (WED AM - TUE AM)...



A large upper low resides over the north central US this morning 

with building high pressure over the eastern Pacific. The low will 

begin to separate later today with the back half breaking off and 

retrograding back towards CA/NV into Thursday. This will push the 

southern half of the ridge offshore while the northern half wraps 

around into the PacNW. This may generate some isolated showers and 

thunderstorms in the afternoons/evenings, mainly over north/east NV. 

The upper low will back into NV on Friday with the core of the 

system over srn NV. This will bring better chances of isolated 

showers and thunderstorms in the afternoon/evening with the best 

chances east of the Sierra. Friday night, the low will shift its 

trajectory eastward pulling out of the region on Saturday and 

allowing the ridge to move back in. Models then show a weak trough 

developing west of CA throughout Sunday impacting the region through 

the rest of the period. There are some differences between the 

models and amongst the ensembles as to the relative strength and 

positioning of this troughing. Depending on how strong the offshore 

ridging is and how much influence the trough has, there is a chance 

of some isolated showers Sunday and Monday, mainly over the Sierra 

and into NV. In either case, no significant precipitation is 

anticipated as the official QPF for days 1-6 has at most 0.10-0.25" 

over the Sierra and generally a few hundredths to a tenth of an inch 

under any other areas that receive showers. Locally higher amounts 

possible should any thunderstorms develop.



The large upper low over the north central US will keep temperatures 

moderated today at 5-15 deg F below normal for most of the region 

with some warmer temperatures over the coast thanks to the offshore 

ridge. Warming from west to east is then expected the rest of the 

week and into the weekend as high pressure builds offshore. Northern 

and central coastal CA can expect above normal temperatures 

beginning tomorrow with these conditions spreading across the region 

the rest of the week. Expecting widespread above normal temperatures 

Friday through Monday by 5-10+ deg F (most prominent away from the 

coast).



Freezing levels 6-8 kft over NV today and 7-12.5 kft over CA with 

higher freezing levels spreading across the region the rest of the 

period. Generally 8-12 kft the rest of the week with the region 

generally above 10 kft by Saturday remaining around 10-12 kft the 

rest of the period.





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







AS



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