155
AGUS76 KRSA 042035
HMDRSA

Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
1230 PM PST Thu Dec 4 2025

...DRY CONDITIONS FOR MOST OF THE REGION THROUGH THE PERIOD AS
STRONG HIGH PRESSURE SITS OVER THE EASTERN PACIFIC...
...LIGHT SHOWERS ALONG THE NRN BORDER FRI INTO EARLY NEXT WEEK AS A
A FEW SYSTEMS SLIDE DOWN THE RIDGE INTO THE PACNW...

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

Not much has changed since this morning. The strong upper ridge
remains entrenched over the eastern Pacific steering moisture well
to our north. Models have the ridge offshore throughout the rest of
the forecast period resulting in dry conditions for the majority of
the region. Occasional disturbance are expected to rotate around the
north/east side of the ridge into the PacNW generating precipitation
over WA/OR. The southern edges of these disturbances are progged to
bring some light showers to the northern regional border Friday
through early next week. There is still disagreement on how much
these systems will flatten the ridge, mainly for the Tuesday system.
Though either way not expecting much precip south of the Smith Basin
and nothing south of Cape Mendocino. In our area, the brunt of the
precip will fall over the crest of the srn OR Cascades and the
mountains of ne NV.

Afternoon update was again a blend of WPC guidance and the latest
NBM. Amounts went up over ne NV and the Cascades by another 0.10-
0.25" from this morning. Things over CA are relatively stable only
going up or down along the border by a few hundredths. QPF totals
through 12z Weds: 0.25-0.60" Smith Basin, 1-2.50" srn OR Cascades, 1-
2.75" Ruby Mountains, and a few hundredths to 0.25" for the rest of
the nrn CA/NV borders.


QPF graphics are available at www.cnrfc.noaa.gov/qpf.php



AS

$$