Hydrometeorological Discussion
Issued by NWS California-Nevada RFC

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046
AGUS76 KRSA 241606
HMDRSA

Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
800 AM PST Tue Jan 24 2017

...SCATTERED SHOWERS THROUGH THURSDAY MAINLY HIGHER TERRAIN...

.24 HOUR PRECIPITATION TOTALS (ENDING JAN 24 AT 400 AM PST)...

Residual showers and isolated thunderstorms behind a cold frontal
passage brought precip to much of the state yesterday. Along the
coast, amounts were generally 0.25-0.5" from Cape Mendocino down to
Ventura County, with local amounts up to 0.75" over parts of the Eel
R basin. Over SoCal, the San Gabriel and San Bernadino Mtns picked
up 0.75-1.25" of precip, while the San Jacinto and Lacuna Mtns
received 1-2". Over Shasta and the Northern Sierra, 0.25-0.5" precip
fell. The Central and Southern Sierra received 0.75-1.25" before
things wound down. The Sacramento and San Joaquin valleys received
0.1-0.2" precip. Over Nevada, around 0.25" fell along the east side
of the Sierra and over the Ruby Mtns, with less than 0.1" measured
elsewhere.


.METEOROLOGICAL CONDITIONS (SHORT TERM: TUE AM - FRI AM)...

Cyclonic flow around a broad upr trof across the western portion of
the country is continuing to bring scattered light showers to the
region this morning. These will be on the decrease as this feature
moves east throughout Tuesday.

A secondary s/wv trof dropping from the north later Wed into Thu
will bring some scattered light precip to the higher terrain of
northern CA and northern NV. Lack of available moisture and weak
forcing will result in amounts generally below 0.10-inch with this
system.

Conditions then turn dry at the end of the period (Friday morning)
as an upr ridge builds across the Pacific Northwest and northern CA.


.METEOROLOGICAL CONDITIONS (LONG TERM: FRI AM - MON AM)...

Ridging builds in from the Pacific on Friday, and looks to dominate
the pattern through Monday. Dry conditions are expected across the
region, with the upper jet displaced well to the north.


.HYDROLOGICAL CONDITIONS...

Rivers are receding across the area this morning as the precip
continues to move out of the area. Still some high flows in a few
areas... mainly the mainstem of the Sacramento and San Joaquin
rivers and the San Diego River, which is holding around monitor
stage this morning at FSNC1.

Flow at the Moulton Weir should continue through tomorrow morning.
Flow at Colusa, Tisdale, Moulton, and Fremont weirs will continue
for the next next 5 days and beyond. A few reservoirs are still
releasing water for flood space, so expect flows along the mainstem
of the Sacramento, Feather, and San Joaquin rivers to remain high.
Elsewhere, expect flows to begin receding towards baseflow
conditions throughout the week.

More information on the CNRFC website at http://www.cnrfc.noaa.gov

JM/DRK/JM/MI

$$



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