181
AGUS76 KRSA 211522
HMDRSA

Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
830 AM PDT Tue May 21 2024

...SCATTERED SHOWERS OVER THE CNTRL/SRN SIERRA TODAY WITH ISOLATED
THUNDERSTORMS OVER E NV...
...NEAR TO BELOW NORMAL TEMPS THIS WEEK WITH DRY CONDITIONS ASIDE
FROM OCCASIONAL LIGHT SHOWERS ALONG THE NRN CA/NV BORDERS AS
DISTURBANCES PASS THROUGH THE PACNW...

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

An upper level trough over the western U.S. today into Saturday with
several shortwaves/lows moving through the Pac NW. One low moves
into the Pac NW tonight into Wednesday and into ID and Nrn NV
Wednesday afternoon into Thursday morning.  This will bring showers
and possible isolated thunderstorms near the ORCA border and far Nrn
NV tonight into Wednesday night. Max temperatures generally near
normal to 10 degrees below normal over CA and below normal to around
15 degrees over NV this afternoon cooling to 5 to 15 degrees below
normal along far NW CA coast and Srn OR and far Nrn NV on Wednesday
and near normal to 10 degrees below elsewhere. Weak disturbances
move through Nrn and Central CA Thursday for possible isolated
showers and thunderstorms over central/Srn Sierra. Temperatures
generally cool to near normal to 10 degrees below normal Thursday. A
weaker shortwave trough moves through Central/Srn Ca and Srn NV on
Friday for a chance of isolated to scattered showers and isolated
thunderstorms over the Central/Srn Sierra and over NV. Max
temperatures cool to 10 to 20 degrees below normal over the Central
and Srn CA coast Friday afternoon. Another low moves through the Pac
NW Saturday bringing a chance of showers and isolated thunderstorms
near the ORCA border and Nrn NV. Max temps generally cool to below
normal up to around 20 degrees on Saturday. Weak ridging over the
region Sunday into Monday with warmer temperatures and mainly dry
conditions. Max temperatures warm up to near normal to 10 degrees
above normal for most of NV and Srn OR and interior CA with below
normal temps up to around 10 degrees below normal over the CA coast.

Freezing levels generally 9000-13,000 ft except in the north
lowering to around 5000-9000 ft Wednesday into Thursday and again
Saturday as systems move through.  Precipitation amounts generally a
tenth of an inch or less except around 0.25 inches for the west
slope of the Srn Cascades.


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



Osborne

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