454
AGUS76 KRSA 131607
HMDRSA

Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
905 AM PDT Mon Oct 13 2025

...WIDESPREAD PRECIP HEAVY AT TIMES IS EXPECTED ACROSS ALMOST THE
ENTIRE REGION TODAY THROUGH TUE WITH COOLER TEMPS...
...GENERALLY DRY FOR THE SECOND HALF OF THE WEEK...

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

Satellite imagery shows the upper low near the southern OR coast
this morning, while a front stretches to the south.  Widespread
precip is affecting much of NW CA into southern OR, with showers
into mainly the Sierra and portions of northern NV.  Heaviest
amounts in the past 6 hours or so have been 0.5-0.9" and locally
wetter in northern Del Norte County in the Smith basin.

Expect the low to track south just off the coast for the next 24
hour or so before turning east and moving inland over the central
coast of CA.  With the track a bit further offshore for longer
compared to yesterday, forecast storm-total precip amounts decreased
around 0.3-1" across much of northern and central CA, while
increasing 0.3-2" in portions of the transverse ranges of southern
CA, especially eastern portions.  With good dynamic support aloft
and H85 onshore flow peaking around 25 kts and PW values peaking
around 1-1.2" near the central and southern coast, expect a round of
heavier precipitation to spread across much of CA into western NV,
with highest overall totals expected from the SF Bay area and the
northern Sierra through portions of SW CA into the southern Sierra
and western NV, with a general gradient toward higher precip in the
southern portion of the areas mentioned.  Expect freezing levels
around 6000-9000 ft near onset of precip, then falling to generally
6500-8000 ft behind the front (little change in freezing level is
expected for far southern CA).  Cooling temps and strong forcing
aloft could lead to heavier shower/thunderstorm development at times
the next couple days.  Overall precip totals 0.5-1.5 inches are
expected on the north coast, with 0.7-2" on the central coast and 1-
3" southern coast, except only 0.3-1.5" far SW CA.  In the central
valley, amounts 0.7-1.4" are expected, with 1-2 in the northern
Sierra and 1.5-2.5" in the central and southern portions.  Generally
0.5-1.5" are expected in NV with 0.1-0.6" in far northern/NE CA and
southern OR.


Please Note: This product may NOT be routinely updated this
summer. 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.

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



Lerman

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