Scientific Forecaster Discussion
Area forecast discussion
National Weather Service Eureka California
413 am PDT Monday Mar 30 2015
Synopsis...an approaching cold front will spread rain across del
norte and Humboldt counties tonight and Tuesday. Limited rainfall
is expected over Trinity and Mendocino counties. Unsettled weather
will persist through much of the week north of Cape Mendocino.
Colder nighttime lows will lead to the threat of frost across
portions of the interior.
Discussion...high clouds are streaming overhead ahead of an
approaching upper trough over the east Pacific. In the lower levels...
some stratus and patchy fog have developed once again along the
Redwood coast and up portions of the Eel River valley. Early
morning temperatures are mostly near 50...although temperatures have
dropped to near 40 degrees over central Trinity County. Low clouds
are expected to pull back to the coast by middle to late morning.
The next rain maker is still expected to cross the north 1/2 of the
area tonight and Tuesday. Rainfall amounts with this system still
look fairly light...ranging from near 1/2 inch in the del Norte
Mountains to trace amounts just S of Cape Mendocino. Snow levels
will be quite high during the bulk of the precipitation event...although
levels will rapidly fall Tuesday as precipitation becomes more showery. As a
result...snow amounts are expected to be minimal. Cooler surface
temperatures will trail the front...with areas of frost possible
during the middle of the week over the interior. Have included
patchy frost over portions of the interior Wednesday and Thursday mornings...
but unsettled weather across the north portion of the area may limit
formation. The growing season begins across the north coast interior
zone on 4/1...and the season has been underway for about a month
across the Mendocino interior zone.
Temperatures will warm a bit late this week...but then drop off
again by sun as a trough digs over the east Pacific. /Sec
Aviation...MVFR to IFR conditions and light winds to calm conditions
will continue at kcec and kacv through the early morning. The lower
conditions are due to reduced ceilings and/or visibilities. VFR
conditions and light winds will prevail at kcec and kacv this
afternoon. VFR conditions and light winds to calm conditions will
continue at kuki today.
Marine...winds and seas will diminish today as an inland thermal
low pressure trough and an offshore high pressure ridge weakens.
A weak cold front will move across the region tonight then a high
pressure ridge will build across the region in the wake of the
front. The high pressure ridge will strengthen the middle of this
week increasing the pressure gradient and subsequently northerly
winds and the seas. Small craft advisories are likely across the
southern outer waters Tuesday night through Friday and across the
northern outer waters Wednesday through Friday due to elevated
northerly winds and/or the seas.
Northwest California coastal waters...
Small Craft Advisory until 9 am this morning for pzz475.
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