Version:  Current  |  Back 1  |  Back 2  |  Back 3  |  Back 4  |  Back 5  |
Hydrometeorological Discussion
National Weather Service / California-Nevada RFC / Sacramento CA
625 AM PDT Mon Jul 20 2026

...SCATTERED SHOWERS/T-STORMS MAINLY MON-WED SIERRA AND NV...

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

High pressure over the interior of the western US centered over 
Colorado this morning...while elongated troffing resides just off 
the west coast with Tropical Storm Elida rides northward between 
125W and 130W in the general southerly flow that is advecting high 
moisture content air across the region. 20/12Z RAOBs across CA and 
NV generally indicate anywhere from 1.00- to 1.50-inches of PW. 
Already plenty of cloud cover across the region with radar imagery 
indicating scattered returns with the best concentrated activity 
over the northern CA and southern OR. However...with the low-levels 
of the atmosphere still relatively dry...very little in the way of 
measurable precip has been recorded overnight.

Over the next few days...look for showers and thunderstorms to 
develop mainly during the afternoon hours with an increase in 
instability. Best locations look to be the central and southern 
Sierra as well as much of the state of NV. Then into the latter half 
of the week...an area of low pressure off the Pacific Northwest with 
high pressure over the interior will set up drier southwest flow 
across much of the region limiting the potential for convective 
precip to eastern NV and southeastern CA.

Freezing levels will fluctuate from approx 14000- to 17000-feet 
through the period with the lowest to the northwest and highest to 
the east.


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.