Hydrometeorological Discussion
Issued by NWS California-Nevada RFC

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AGUS76 KRSA 191900
HMDRSA

Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
1100 AM PST Sun Feb 19 2017

...LIGHT PRECIP TODAY THEN HEAVIER PRECIP ARRIVING TONIGHT THROUGH
MON NIGHT...

.24 HOUR PRECIPITATION TOTALS (ENDING FEB 19 AT 400 AM PST)...

Mainly light precip was observed across the region.  North coast
totals were 0.1-0.6" with up to 0.2" in the Russian/Napa basins. The
remainder of the coastal areas received generally 0.1-0.3".  Just a
few hundredths of an inch fell in the San Joaquin Valley, with 0.1-
0.5" in the Sacramento Valley.  Around Lake Shasta as well as the
upper Klamath basin, totals were 0.1-0.6".  NE CA picked up
generally 0.1" or less.  Most of the Sierra picked up 0.1-0.3",
although the Feather basin picked up 0.1-0.3" in the ern portion,
0.2-0.7" middle, and 1-2" wrn portion.  East-side Sierra and NV
locations picked up 0.2" or less.


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

A shortwave passing across the srn OR Cascades this morning has
caused an uptick in precip over the north coast and upper Klamath
basin, as well as other portions of nrn CA, as expected.  Precip
should continue over these areas and portions of nrn NV through
today.

Expect a moisture plume to begin to impact the cntrl CA coast late
this afternoon with PW values reaching as high as 1.4" near the
coast.  Models showing a fairly narrow band of the heaviest precip,
and still show inconsistencies in tracking the band.  Initial
heaviest precip Mon morning in the Sierra shifted south a little
more into the American through the Stanislaus basins.  A stripe of
heavy precip extends back across the cntrl valley to near San
Francisco.  For Mon, precip in the Sierra shifts north more into the
Feather and American basins, although the ECMWF is slower to shift
precip north.  By later Mon night, precip should begin to shift
south more quickly and wind down Tue.  Subsequent waves should push
light precip across the region through much of the week.  Freezing
levels should be 7000-9500 ft early Mon morning and gradually fall
to 7000-8500 ft Mon evening and 5500-8500 ft late Mon night.


.HYDROLOGICAL CONDITIONS...

High flow/stages will remain on mainstem rivers for the next five
days. Tributary flows across the area are will be on the rise late
Sunday into Monday as the next system moves onshore across northern
CA. Expect flood stages along the Sacramento River and San Joaquin
River to continue for the next five days. Vernalis is currently just
above danger stage with slight additional rises expected for the
next several days.


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

KL

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