Version:  Current  |  Back 1  |  Back 2  |  Back 3  |  Back 4  |  Back 5  |
Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
610 AM PDT Tue May 12 2026

...LIGHT PRECIP NEAR THE CA/OR BORDER AND OVER THE N COAST LATE 
TONIGHT THROUGH WEDS AM...
...SEASONABLY WARM AND DRY THROUGH FRIDAY BEFORE TEMPERATURES 
MODERATE OVER THE WEEKEND...

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

A strong upper ridge remains over the Four Corners this morning 
keeping dry conditions for most areas across the region for today 
along with well above normal temperatures away from the coast. 
Anomalies expected to be around +10 to +20 deg F, locally higher 
over ne NV. An upper low approaching the PacNW will then usher in 
some chances of light precip along the nrn CA/OR border into the 
north coast late tonight through Wednesday morning. Amounts look 
lighter than yesterday, so QPF was brought down to generally 0.10" 
or less (up to 0.20" Smith Basin). The trough will also push the 
ridge further inland mid to late week allowing for some moderation 
of temperatures. Still expecting above normal conditions for most 
areas with anomalies at +5 to +15 deg F as 500 mb heights remain 
quite high (>580 dm). Another system then looks to approach the 
PacNW on Friday sending troughing into the west coast for the coming 
weekend. This should act to lower temperatures back down near 
seasonal normals. There is some disagreement between the ECMWF and 
the GFS on the depth of this trough as well as its positioning. The 
GFS has a low descending into nrn NV on Sunday with a core of 555 dm 
while the ECMWF has a shallower trough centered over ID and 500 mb 
heights over NV and CA in the 570s dm. The stronger low out of the 
GFS also generates some showers over NV as it passes through while 
the ECMWF does not.

To summarize, dry conditions for most of the period aside from some 
potential showers over the north coast and CA/OR border late tonight 
through Wednesday morning. Continued above normal conditions into 
the end of the week before returning closer to near normal over the 
weekend (though some uncertainty due to model differences).


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.