899
AGUS76 KRSA 042008
HMDRSA

Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
1210 PM PST Wed Dec 4 2024

...LOW PRESSURE MOVES ACROSS PACNW AND DIVES TOWARD GREAT BASIN
THIS WEEKEND...

.METEOROLOGICAL CONDITIONS (SHORT TERM: WED PM - SAT AM)...

No change to a dry forecast through Friday as upr ridging along the
west coast is the dominant feature. A weak s/wv trof approaching the
region will stretch and eventually split on Thursday...but will pass
by as a dry system. Low pressure moving over the northeast Pacific
late Friday into Saturday with the frontal boundary approaching the
coastal waters with precip remaining offshore through Sat 12Z.


.METEOROLOGICAL CONDITIONS (LONG TERM: SAT AM - TUE AM)...

Forecast remains on track with no substantial changes from this
morning. Dry conditions for most of the region as high pressure
stretches from off the coast through CA and NV. The southern end of
a front moving through the PacNW will bring some light showers to
the north coast and along the CA/OR border on Saturday as an upper
low approaches from offshore of BC. This next system will move into
the PacNW as an open trough on Sunday before digging south into nrn
CA/NV the rest of the day and into Monday potentially dropping
additional light showers. High pressure will move back in behind the
trough drying conditions out early next week. QPF totals similar to
this morning, a few hundredths to around 0.25" along the north
coast, 0.25-0.50" over the srn OR Cascades, and a few hundredths to
a tenth of an inch scattered along the northern regional border.

Freezing levels 11-13.5 kft Saturday lowering over far nrn CA/NV
Sunday morning down to 4-7 kft. Lower freezing levels will spread
the rest of the weekend then shift into NV at 4-7 kft or so Monday
and 4.5-12 kft across CA from ne to sw.


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



Kozlowski/AS

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