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Hydrometeorological Discussion
National Weather Service / California-Nevada RFC / Sacramento CA
1245 PM PST Fri Nov 13 2026

...SERIES OF SYSTEMS IMPACTING THE REGION INTO THE MIDDLE OF NEXT 
WEEK...

.METEOROLOGICAL CONDITIONS (FRI PM - THU AM)...

The s/wv trof axis is approaching the north coast this 
afternoon...while the sfc cold front plows inland at a good clip. 
Radar imagery shows the heaviest precip aligned ahead of the frontal 
boundary from the northern Sierra back across the southern 
Sacramento and northern San Joaquin Valleys before reaching the 
coast near the Monterey Bay area. Precip gauges since 13/18Z 
indicate some two hour totals close to or even exceeding 1.00-inch 
over the Marin Headlands...southern Napa County and the Santa Cruz 
Mountains. Minor adjustments upwards were made over the entire SF 
Bay Area to account for current radar trends and gauge reports with 
increases from 0.10- to 0.25-inch. Elsewhere...the current period 
shows a decrease along the north coast around 0.10- to 0.25-inch 
with the cold front making quicker progress inland. 

This system will shift inland this evening and overnight with the 
best precip moving over north-central NV and the central/southern 
Sierra back toward the Point Conception area before tapering off 
across eastern NV and southern CA tonight. Tomorrow is mainly a 
break day with a transitory upr ridge sliding across the area before 
the next system approaches the coast on Sunday and lingering through 
Monday. This s/wv trof will dig offshore and then shift inland 
bringing the best precip to the northern half of the 
region...diminishing across southern CA. 

Still plenty of questions for the Tuesday into Wednesday system as 
models are struggling with both the timing and trajectory of the 
s/wv trof approaching the coast. Few changes were made this far out 
in the forecast period...as to not jump around too much. 


Please Note: This product may NOT be routinely updated.
Please refer to the following product issued by the CNRFC
www.cnrfc.noaa.gov/Daily-Briefing for a graphical summary of
weather and hydrologic conditions.