Hydrometeorological Discussion
Issued by NWS California-Nevada RFC

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AGUS76 KRSA 111642
HMDRSA

Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
930 AM PST Mon Dec 11 2017

 ...DRY THROUGH THURSDAY THEN LIGHT PRECIP IN THE NORTH LATE WEEK...

.METEOROLOGICAL CONDITIONS (SHORT TERM: MON AM - FRI NIGHT)...

High pressure aloft over the Great Basin and low pressure aloft near
the west coast of Mexico are providing a rex block pattern over the
western U.S.  Through mid week, expect the initial high pressure to
break down while another ridge strengthens offshore.  No
precipitation is expected through the period.


.METEOROLOGICAL CONDITIONS (LONG TERM: THU AM - SUN AM)...

Upper level ridge of high pressure over the west coast for a dry day
Thursday.  The ridge weakens as a shortwave trough moves into the
Pacific NW on Friday. A moisture plume about an inch off far NW CA
coast on Friday morning and weakens as it drops south. This system
may bring light precipitation on Friday to southern Oregon and far
Northern CA and far northern Nevada. Weak ridge builds back for
Saturday but warm air advection and a moisture plume may bring a few
showers to the Southern Oregon on Saturday.


.HYDROLOGICAL CONDITIONS...

With no precipitation in the forecast, river levels will remain near
their current conditions for the forecast period.  No monitor levels
are expected to be exceeded.

Due to this current dry spell, April-July runoff forecasts for many
reservoirs have dropped 10-15% since the end of November.


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

KL/HSO/BW

$$



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