Scientific Forecaster Discussion

Return to Local Conditions & Forecast

Without Abbreviations
With Abbreviations

Area forecast discussion 
National Weather Service Eureka California
147 PM PDT sun Mar 29 2015

Synopsis...a fair night will give way to valley and coastal low
clouds and fog by early Monday morning. A cold front will arrive
Monday night...spreading rain across del norte and Humboldt
counties. Limited rain fall is expected over Trinity and Mendocino
counties. Unsettled weather will remain through much of the week.

&&

Discussion...a weak upper short wave will pass over the region
late this afternoon with the upper ridge becoming more established
in its wake. So look for some high clouds to filter over the area
followed by clearing tonight. With a ridge in place for early
Monday, expect another morning of patchy fog along the coast and
through some of the interior valleys. Bfg

Otherwise...the next rain maker is still slated to clip the north 1/2
of the area Monday night and Tuesday. Rainfall amounts with this system
still look limited...ranging from near 1/2 inch in the del Norte
Mountains to trace amounts through southern Humboldt. 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 held off on
frost mention for now due to uncertainty regarding clouds and
lingering precipitation. However...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 in the upcoming work week...but
then drop off again by next weekend as a trough digs over the east
Pacific. Second/bfg

&&

Aviation...valley and coastal clouds cleared by middle-morning
making for VFR conditions across northwest California. Ridging
over head will help establish some low clouds and patchy fog again
tonight for coastal areas and interior valleys. However, the
approach of a shortwave trough will help keep ceilings and
visibilities a little higher overnight. Expect MVFR and periodic
IFR for the fog prone regions during the early morning hours on
Monday. Kml

&&

Marine...a ridge of high pressure offshore in conjunction with a
thermal trough over western California will maintain fresh to
moderate winds through the evening. Winds will diminish overnight
as an approaching shortwave trough weakens the pressure gradient.
The small craft advisories should be good to expire tonight but
may need be adjusted if winds are slow to diminish. After the
frontal boundary passes over the region northerly winds will
develop Tuesday and increase to near gale force late in the week.
Advisories will likely be needed middle-week but it is too early to
issue anything at this time. Short period waves will gradually
subside Monday, however, a west-northwesterly wave train will help
keep seas elevated through the week. Expect steep waves to develop
again late this upcoming week as north winds increase. Kml

&&

Eka watches/warnings/advisories...
California...none.
Northwest California coastal waters...
Small Craft Advisory until 10 PM PDT this evening for pzz455-475.

&&

$$

Visit US at http://www.Weather.Gov/Eureka

Follow US on facebook and twitter at:
http://www.Facebook.Com/nwseureka
http://www.Twitter.Com/nwseureka

National Weather Service Glossary of Abbreviations