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Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
615 AM PDT Thu May 14 2026

...DRY CONDITIONS AND ABOVE NORMAL TEMPERATURES TODAY/TOMORROW...
...COOLING OVER THE WEEKEND WITH SLIGHT CHANCE OF SHOWERS OVER NV ON 
SUNDAY...

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

High pressure sits offshore of CA stretched across much of the 
eastern Pacific with a quasi-zonal flow regime just north. This will 
allow a series of troughs to move into the Pac the rest of the week. 
Troughing will then expand further south into CA over the weekend. 
500mb heights will remain high enough today and tomorrow to keep 
temperatures about 5 to 10 deg F above seasonal averages for much of 
the region before cooling down to below normal over the weekend as 
that troughing digs in. The core of the trough over the PacNW 
Saturday will begin to descend into nrn NV on Sunday sweeping 
through from nw to se exiting on Monday. There is some disagreement 
on the timing and depth of the system between the GFS and ECMWF. The 
GFS is quicker to move it through and does so mostly dry. The det 
ECMWF as well as a number of its ensemble members do drop some light 
precip over NV as it passes through. Official forecast did blend in 
some of the det ECMWF to show light precip over NV for Sunday. 
Amounts for now come out to less than 0.10" except locally a little 
higher over the ne mountains.

Lingering influence of the trough on Monday will keep temperatures 
near normal before warming back up gradually throughout the week as 
high pressure tries to re-assert itself. Continued troughing into 
the PacNW will suppress this some, but expecting temperature 
anomalies of +5 to +10 deg F across most of CA by mid-week. Dry 
conditions as well with Sunday being the only day for potential 
showers.

Freezing levels 10-14.5 kft the rest of the work week lowering over 
the weekend to about 8-13.5 kft across CA. Levels will rise back up 
next week to 11-13 kft.


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.