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Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
1225 PM PDT Mon Mar 30 2026

...COOLER AND UNSETTLED THROUGH EARLY THURSDAY...
...WARMING AND ONCE AGAIN BECOMING DRY FOR FRIDAY INTO THE WEEKEND...

.METEOROLOGICAL CONDITIONS (MON PM - SUN AM)...

Weak s/wv trof moving along the US/Canada border in the vicinity of 
the northern Rockies this afternoon...elongating back southwest to 
an upr low that has finally opened up and making its way eastward 
between 130W and 140W off the CA coast. Light precip continues to 
stream onshore near the CA/OR border and will persist through the 
afternoon and evening hours. As the offshore s/wv trof approaches 
the coast tomorrow...look for precip to become more widespread with 
the best totals along the length of the Sierra with totals somewhere 
between 0.50- and 1.00-inch on Tuesday. A secondary focus point of 
precip will be over east-central NV as the s/wv trof moves overhead 
with 0.25- to 0.50-inch possible. This system will then shift off 
toward the east on Wednesday. For Wednesday...a cool s/wv trof will 
make its way out of the Gulf of Alaska southeast to sweep across the 
Pacific Northwest and northern CA. For coastal areas...amounts will 
range from 0.25- to 0.50-inch over the upper Russian River basin to 
1.00- to 2.50-inches over the Smith River basin. Inland over the 
southern Cascades down through the northern/central Sierra look for 
amounts of 0.75- to 1.50-inches. 

Freezing levels will dip with each successive system moving across 
the area. By Thursday morning...these will be down to 3500-feet 
northwest...6000-feet in the vicinity of I-80...7000- to 10000-feet 
for central areas...and over 12000-feet for far southern areas.

Conditions will dry out and warm up for the upcoming weekend as high 
pressure begins to once again build along the west coast.