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Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
635 AM PDT Wed May 13 2026

...A FEW SHOWERS REMAIN FOR THE NORTH COAST AND UPR KLAMATH TODAY...
...POSSIBILITY OF SHOWERS NORTHEAST LATER SAT INTO SUN...

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

The upr ridge centered over the Four Corners is being displaced 
farther downstream of the region along the front range of the 
Rockies this morning...as a s/wv trof and cold front moves inland 
across the Pacific Northwest and northern CA. Some light precip was 
observed overnight...mainly confined to coastal locations near and 
north of Cape Mendocino with anywhere from a few hundredths of an 
inch (south) to 0.25-inch (Smith River basin). May still see some 
light precip this morning across the immediate northern CA coast and 
possibly over the crest of the southern OR Cascades. This system 
will lift off toward the east-northeast toward the northern Rockies 
today...leaving behind an upr ridge to the southwest of the CA coast 
near 30N/140W and westerly onshore flow between 40N and 50N 
primarily taking aim at the Pacific Northwest.

For Thursday into Friday...a couple disturbances will move through 
the westerly flow aloft and primarily impact southern BC and the 
Pacific Northwest. The latter of the two systems will be a tad 
stronger and drag some light precip closer to the upper Klamath 
River basin on Saturday. As this s/wv trof on Friday moves inland on 
Saturday...look for it to slow its eastward progress and buckle the 
flow as it begins to dig toward the southeast over the Great Basin. 
This may generate some light precip over the upper portions of the 
Humboldt River basin in northeast NV. At this time...amounts look to 
be generally near or less than 0.25-inch. Upstream over the 
immediate west coast...look for dry northwest flow aloft.

Freezing levels are currently showing a sharp gradient near the 
CA/OR border...ranging from 7000- to 11000-feet. Elsewhere across 
the region freezing levels are from about 12000- to 14000-feet with 
the highest values to the east. Thursday and Friday will generally 
show freezing levels from 9000-feet (north) to 14000-feet (south). 
Then as the system digs toward the Great Basin...freezing levels 
will dip a bit across northern areas from 6000- to 9000-feet and 
10000- to 14500-feet across the southern half of the area. By early 
Tuesday with the more amplified flow...the gradient becomes more 
northeast to southwest with 8500-feet over northeast NV to about 
13000-feet or so along the immediate coast. 


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.