AGUS76 KRSA 101945
HMDRSA

Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
130 PM PDT Fri Apr 10 2026

...WET AND UNSETTLED WEATHER TO CONTINUE THROUGH THE WEEKEND AS 
MULTIPLE UPPER LOWS SWING ONSHORE...

.METEOROLOGICAL CONDITIONS (SHORT TERM: FRI PM - MON AM)...

The upper level trough and cutoff have begun to negatively tilt and 
shift to the east. Showers and thunderstorms have continued to 
develop across northern California, spreading from the northern San 
Joaquin Valley/Central Coast to the Oregon state line. Things 
continue to look on track for this upper low to open and shift 
eastward through this evening and another stronger low to swing in 
from the Gulf of Alaska through Sunday. 

No major changes from this morning's QPF with minor adjustments made 
with latest WPC, NBM, and some HRRR guidance. Largest increase was 
made over the Sierra, north of the I-80 corridor (~0.5 inches 
through the first 3-days).

Freezing levels have lowered under the current low to below 8k feet 
along the North Coast while remaining above 11k feet across the 
south. Levels will continue to lower through the weekend to below 6k 
feet across the north on Monday morning and 8k feet across the 
south.  

.METEOROLOGICAL CONDITIONS (LONG TERM: MON AM - THU AM)...

Still anticipating the weekend upr low to be shifting inland on 
Monday...crossing the northern Sierra on its way to the Great Basin. 
Best precip totals will be ahead of the primary circulation over 
portions of eastern NV with amounts over the favorable higher 
terrain from 0.10- to 0.33-inch. Otherwise...look for some remnant 
shower activity mainly over the southern Cascades and length of the 
Sierra with amounts generally remaining at 0.10-inch or less.

After this system exits to the east toward the central 
Rockies...brief ridging will slide across the region bringing 
primarily dry conditions on Tuesday. This is all ahead of another 
area of low pressure dropping southeast from the Gulf of Alaska 
toward southern BC and the Pacific Northwest. The 10/12Z models are 
showing a little better agreement in terms of the depth of this s/wv 
trof moving inland and clipping the northern tier of the region. 
After incorporating the latest WPC QPF and 10/13Z NBM...precip 
amounts remained relatively consistent with the morning 
forecast...which shows 0.25- to 0.50-inch over the Smith River basin 
down to near the mouth of the Klamath River and then inland over the 
crest of the southern OR Cascades. Lesser totals more in the range 
of 0.10- to 0.25-inch are forecast over the Shasta Lake drainage 
over to far northern NV close to the OR and ID border. Farther south 
across northern CA...0.10-inch or less will fall across the Eel 
River basin for coastal sections and the northern Sierra for inland 
locations. Freezing levels will generally be from 5000- to 7000-feet 
where precip is expected.



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



CH/DRK

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