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Hydrometeorological Discussion
National Weather Service / California-Nevada RFC / Sacramento CA
640 AM PDT Mon Jul 13 2026

...MONSOON MOISTURE CONTINUES THROUGH TUE WITH SCATTERED PRECIP...
...DRYING WED-FRI EXCEPT FAR SOUTHEAST THEN MOISTURE RETURNS SAT...

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

Strong high pressure continues downstream of the area...anchored 
over the northern/central Rocky Mountain states stretching toward 
the northern Plains states. This has generated record setting heat 
with a core of nearly 6000-meters at 500-mb over these locations. 
Flow across CA and NV on the upstream side of this feature continues 
from the southeast to south with a strong surge of moisture 
associated with the monsoon. 13/12Z RAOBs at both KNKX and KREV 
indicate a PW value very close to 1.00-inch with the overall profile 
showing less temperature/dew point spread in the lower levels. Radar 
and satellite imagery shows a stream of cloudiness and scattered 
echoes streaming northward with the best line of showers stretching 
from near Lake Tahoe over extreme western NV. This overall flow 
regime will continue through today and tomorrow with scattered 
showers and thunderstorms possible mainly over the Sierra...coastal 
mountains of southern CA and much of NV. Then into Wednesday...the 
high pressure moves far enough downstream across the middle of the 
country with a s/wv trof approaching the Pacific Northwest...which 
is expected to turn the overall flow a bit more from the southwest. 
This will dry out the atmosphere a bit with PW values dropping 
closer to 0.50- to 0.75-inch...except for far southern CA and 
southern NV. This will pull much of the precip back to these areas 
through Friday. By the time the next weekend approaches...look for 
the high pressure to re-establish itself over the northern/central 
Rocky Mountain states stretching toward the northern Plains states. 
Flow across CA and NV turns southeast and south...drawing the next 
surge of moisture toward the region.

Freezing levels are currently running from 14000- to 17000-feet from 
northwest to southeast...fluctuating a little through the period.


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.