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AGUS76 KRSA 050814
HMDRSA

Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
1215 AM PST Wed Feb 5 2025

...NORTHERN CA DRYING OUT AS COLD FRONT MOVES SOUTH AND INLAND...
...NEXT ROUND OF WIDESPREAD PRECIP EXPECTED THU INTO EARLY FRI...

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

Precip has pretty much wrapped up across northern CA sans an area of
scattered showers moving onshore along the north coast late this
evening into Wednesday morning. The cold front has tracked inland
over western NV and back southwest across the southern Sierra and
central CA coast near Point Conception. Along with the cold front
making progress across the region...the associated moisture plume
entrained ahead of the boundary has been shunted to the south and
begun to erode as it rounds Point Conception and makes its way over
coastal southern CA. Best precip through the overnight hours ending
05/12Z will fall over the southern Sierra from the Merced River
basin down to the Kern River basin with totals generally in the
range of 0.75- to 1.50-inches. Back closer to the coast...the south
facing slopes of the Santa Ynez Mountains will see somewhere between
0.25- and 0.75-inch...while the rest of the area near Point
Conception should remain near or less than 0.33-inch.

Wednesday will see the drying trend continue for much of the
area...except in the vicinity of northwest CA and the upper Klamath
River basin...as the area continues to be influenced by the upr
spinning west of the Pacific Northwest coast. This feature will open
up and the resulting s/wv trof will swing toward the CA coast on
Thursday into Friday...bringing the next round of widespread precip
to the region with the best totals over the length of the Sierra
from 1.00- to 2.00-inches...local to 2.50-inches from the Feather
River basin down to the American River basin. Along coastal
sections...amounts will range from 0.50- to 1.00-inch from the CA/OR
border all the way down to the transverse mountains of southern CA.
Some localized amounts may approach 1.50-inches between the Eel and
Russian River basin...as well as the Big Sur coast. Freezing levels
will average from around 2500-feet near the CA/OR border...to approx
4000-feet along I-80...5000- to 7500-feet across central CA into
much of southern NV...and above 9000-feet for southern CA and the
extreme southern portion of NV near Las Vegas.

Conditions dry out for the weekend with northwesterly flow aloft. A
weak s/wv trof moving through this flow on Saturday may generate
some scattered light showers over the crest of the southern OR
Cascades and the Smith River basin.


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



Kozlowski

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