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AGUS76 KRSA 231547

HMDRSA



Hydrometeorological Discussion

National Weather Service / California Nevada RFC / Sacramento CA

830 AM PDT Tue Apr 23 2024



...COOL WITH CHANCE OF PRECIP THIS WEEK ESPECIALLY OVER THE NORTH...



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





Upper level low offshore of the CA coast (around 130W 32N) with a 

sfc low off the Nrn CA coast this morning. The low weakens as it 

approaches the CA coast and inland over Srn CA Wednesday 

afternoon/night. Some moisture and instability spreading north ahead 

of the low for possible isolated to scattered showers and 

thunderstorms today and Wednesday, mainly over the higher terrain of 

Nrn CA and along the Sierra and over Nrn and Central NV. A few 

showers and thunderstorms developed over the Nrn and Central Sac 

Valley and over Nrn and Central NV this morning. Precip amounts 

generally 0.25 inches or less but local amounts to around 0.75 

inches possible. Low clouds over the CA coast with deeper marine 

layer for possible drizzle/ light rain this morning. The shortwave 

trough shifts to the east out of the region Thursday as another 

shortwave trough approaches the Pac NW and Nrn CA coast and deepens 

over the region on Friday as another wave drops into the region. 

This will bring precip to the north, especially over the higher 

terrain on Thursday and spreading south on Friday. Precip amounts 

0.5-1 inch for the Smith Basin and west slope of Srn OR Cascades and 

Ruby mtns and generally a third of an inch or less elsewhere over 

the higher terrain in the north on Thursday. Precip amounts for 

Friday generally around a quarter of an inch or less except locally 

to around a half an inch in the Nrn Mtns including the Srn OR 

Cascades and Ruby Mtns. Precipitation may stretch south along the 

Sierra and into Srn NV and possible a few showers over the San 

Bernardino Mtn into San Diego Count Mtns Friday. 



Max temperatures near normal to 15 degrees below normal over the CA 

coast and into the Central Valley and near normal to 15 degrees 

above normal for Srn OR and SE CA and NV this afternoon cool to 

around near normal to 15 degrees below normal across the region by 

Thursday afternoon and similar Friday afternoon. Temperatures may 

warm up to near normal for most of the region except around 10 

degrees below normal along NW CA coast Sunday afternoon. Overnight 

temperatures near normal to around 15 degrees above normal decrease 

to around normal Friday night then warming to near normal to 15 

degrees above normal Sunday night. 



Freezing levels around 10000 ft and higher today then dropping to 

around 8000-10000 ft for CA on Wednesday and around 10000-11000 ft 

over NV then drop to around 5000-7000 ft over Nrn CA and 8000-10000 

ft for Central and Srn CA and NV Thursday morning and around 4000-

6000 ft over Nrn CA and 6000-8000 ft elsewhere Friday night and 

rising to around 6000-8000ft over Nrn CA and Nrn NV and 8000 ft and 

higher elsewhere over the weekend.  



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







Osborne



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