AGUS76 KRSA 121520
HMDRSA

Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
830 AM PDT Sun Apr 12 2026

...UNSETTLED WEATHER THROUGH MONDAY AS THE SLOW MOVING UPPER LOW 
SHIFTS INLAND...

.METEOROLOGICAL CONDITIONS (SUN AM - SAT AM)...

The upper low has begun to slowly move onshore as a surface low 
spins along the Humboldt County coast. This is spreading scattered 
shower activity across much of the forecast area. The upper low will 
continue to slowly move inland throughout the day today and into 
Monday. 

The heaviest precipitation of 1-2 inches during the next 24 hours 
will focus over the higher elevations of the Shasta Drainage, Sierra 
Nevada, and eastern Transverse. Thunderstorm activity may lead to 
locally higher amounts across the North as the meso low makes its 
way inland. 

Shower activity is likely to continue through Monday and into 
Tuesday morning as the upper low departs the region and before a 
brief period of ridging and dry conditions return to the region. 

Models continue to show a broader trough moving across the Pacific 
Northwest and digging south enough to spread precipitation across 
the north on Thursday next week. Accumulations are currently 
relatively light, though forecast are likely to change as models 
continue to to converge on the overall characteristics of this 
trough. 

Freezing levels have dropped quite a bit over the past several hours 
and begin the forecast period below 5k feet across the north and 
rise to ~10k feet across the south. Levels are expected to rise 
again on Tuesday under the brief period of ridging. 

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.

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



Imgarten

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