Hydrometeorological Discussion
Issued by NWS California-Nevada RFC

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7
409
AGUS76 KRSA 231652
HMDRSA

Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
930 AM PST Thu Nov 23 2017

...MAINLY LIGHT PRECIP OVER SRN OR/NRN CA/ FAR NRN NV THROUGH EARLY
FRI...
...MORE WIDESPREAD PRECIP EXPECTED SAT INTO MONDAY...

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

Weak warm front/WAA over northern CA and far northern Nevada today
and a weak cold front will move through later today into tonight
along with moist plume (PW plume around 1.6) aimed at Northern Ca
(PW around 0.9 inland). This will generally bringing some light
precipitation (less than 0.25 in) except locally moderate at times
into Friday morning. 1-1.5 inches possible for the Smith Basin and
around Crater Lake area by Friday morning.  Weak ridge builds in
behind this system for generally dry conditions Friday afternoon
into early Saturday. The next stronger system will bring
precipitation over the weekend into Monday.

00Z models and 12Z GFS are slower and lighter with the WAA
precipitation on Saturday than yesterdays runs so decreased amounts
for Saturday. Precipitation will become more wide spread Saturday
night into Sunday with moisture plume about 1.5 in) along the Nrn CA
coast between Cape Mendocino and Bay area Saturday evening into
Sunday morning and around the Monterey Bay and Point Conception
during the day Sunday.  Increased amounts Sunday afternoon and
evening, especially in the Shasta area and along the Sierra. The
trough moves through late Sunday into Monday for some showers. Ridge
builds in behind trough for dry conditions late Monday night into
Tuesday.

Freezing levels above 10,000 ft on Saturday drop down to around 6000
ft in the far north to around 8000 ft for the Northern Sierra on
Sunday and dropping to around 3500 ft in Shasta region and 4000-
6000ft for the Northern and Central Sierra by Monday morning with
showers behind the cold front.


.HYDROLOGICAL CONDITIONS...

Conditions are mostly quite across the region. Expect a few minor
rises on the north coast rivers with the light precip last night and
early morning. Conitions will remain steady for the next 2 days
before more precip moves in over the weekend. Exect to see minor
rises on most area rivers over the weekend across the northern half
of CA. The Truckee River at Truckee may approach monitor stage by
Sunday if Tahoe releases remain the same. All other locations are
expected to remain well below monitor stages.


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

HSO/MI

$$



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.