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AGUS76 KRSA 181509

HMDRSA



Hydrometeorological Discussion

National Weather Service / California Nevada RFC / Sacramento CA

810 AM PDT Thu Apr 18 2024



...WARM AND GENERALLY DRY INTO MONDAY...

...CHANCE OF PRECIP ON TUESDAY AS A LOW APPROACHES THE CA COAST...



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



An upper level ridge of high pressure off the west coast today 

weakens as a weak disturbance approaches Point Conception area 

tonight and moves onshore Friday. Today should be a dry day but may 

see cumulus development over the Central/Srn Sierra and Srn NV with 

a possible isolated shower on Friday afternoon/evening. A shortwave 

trough approaches the Pac NW/ B.C. with the trailing end of the 

associated weak front possibly clipping the far NW CA Coast 

Saturday. This may bring some light precip to the far NW CA coast 

and along the Srn OR Cascades Saturday. A weak shortwave ridge of 

high pressure moves over the region Sunday into Monday bringing dry 

conditions.  An upper level low forms over the Eastern Pac around 

133 W and 33N Monday night and gets closer to the CA coast Tuesday 

into Wednesday. Models and ensemble members vary with the timing and 

strength and track of this low for low confidence in the details of 

the forecast mid-week next week. The 06Z GFS and the 00Z EC show the 

low moving se and moving onshore around Baja on Wednesday (GFS) and 

Thursday (EC) and the Canadian has low farther north off the Nrn CA 

coast Tuesday night into Wednesday. The forecast is mainly a mix of 

NBM and WPC for Tuesday with a chance of light precip over the north 

and along the Srn CA coast. 



Max temps near normal to around 10 degrees above normal today and 

Friday (except along the Srn CA coast up to 10 degrees below normal 

on Friday).  Max temps generally 5 to 15 degrees above normal over 

the weekend and into Monday except up to 10 degrees below normal for 

the NW CA coast Saturday and Central and Srn CA coast Monday. Max 

temps cool to generally near normal to 10 degrees below normal for 

most of CA on Tuesday and remain around 5 to 15 degrees above normal 

for NE CA and most of NV. Overnight lows generally near normal to up 

to 15 degrees above normal. 



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







Osborne



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