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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Monday
• 
• High: 49 °
• Low: 45 °
• Rain

• Tuesday
• 
• High: 52 °
• Low: 41 °
• Partly Cloudy

• Wednesday
• 
• High: 52 °
• Low: 43 °
• Partly Cloudy

• Thursday
• 
• High: 54 °
• Low: 43 °
• Partly Cloudy

• Friday
• 
• High: 52 °
• Low: 43 °
• Chance of Rain

Area forecast discussion...updated 
National Weather Service Eureka California 
935 PM PST sun Feb 12 2012 


Synopsis...a front will move across the region this evening 
spreading rain...and snow to elevations above 3500 feet tonight. 
Scattered rain and snow showers will linger on Monday as an upper 
trough moves overhead. 


&& 


Update...snow has been reported by several spotters in Trinity 
County down to 1700 feet (but with temperatures at or above 35 degrees). Have updated 
the forecast to include snow mention down to 1500 feet...but accumulations 
should be light as it will take a while for temperatures to fall enough to 
snow to start sticking (especially on the roads). Otherwise...rain 
will continue overnight as an upper level low moves over northwest 
California...which is currently portrayed nicely in the forecast. Jca 


&& 


-----------------------previous discussion---------------------- 


Discussion...first weather concern centers around tonights frontal 
passage and how low snow levels will eventually fall. At this time 
snow levels are fairly high (4k to 5k) and with plenty of middle and 
high clouds present do not anticipate significant drop tonight. By 
sunrise snow levels will likely be closer to 3000 feet and locally as 
low as 2500 but precipitation will be spotty by then. Isolated to scattered 
showers expected during the remainder of the day on Monday...tapering 
off through Tuesday as the trough aloft passes. Next challenge is on 
Tuesday night into Wednesday due to another (even colder) upper low 
which models are in good agreement on moving north to south across 
the County Warning Area. This one will be a bit trickier since it passes through 
during the night and early morning hours. Forecast models keep this 
this system quite dry with very little to no quantitative precipitation forecast but 700t and thickness 
suggests any precipitation that falls will be snow to perhaps 1500-2000 feet 
by Wednesday morning. Another light rain producing system arrives on 
Saturday followed by a stronger ridge of high pressure expected late 
in the weekend and next week. 


&& 


Aviation...cold front approaching the coast is bringing some 
light rain showers to the coast. This will gradually spread inland 
tonight as the cold front pushes across the area. Conditions are 
mainly VFR as as of 3pm. As the rain gets heavier this evening 
expect periods of MVFR conditions. The front is expected to cross 
the area around midnight tonight. Behind the front showers are 
expected. Gusty winds and brief periods of MVFR conditions are 
likely with these showers...although there will be breaks in 
between showers. Showers are expected to persist through the day 
tomorrow before tapering off in the evening. Mkk 


&& 


Marine...light southerly winds are in place across much of the 
waters currently ahead of a cold front. Winds are expected to 
become northwest and increase to near gale to gale force by 
midnight. 


A northwest swell around 10 feet is currently in place across the 
waters. This will stay nearly steady through the night. Steep 
short period wind waves will dominate tomorrow so combined the 
seas into one wave group. Combined seas will peak around 16 feet. 


Monday night winds will decrease as the high pressure weakens. At 
the same time a longer period swell begins to move into the area 
at around 12 feet at 15 seconds. 


Tuesday into Wednesday models show an area of low pressure moving 
across the region. For the past several days models have been 
very inconsistent with each other and run to run. This morning 
most models finally came into better agreement bringing an inside 
slider low down across northern California. However the 18z runs of GFS 
and NAM now show it coming in slower and farther east so 
confidence remains low. High pressure looks to build back in 
behind this system until Friday when another system is pronged to 
move through...although models dont agree where it will be 
located. Mkk 




&& 


Eka watches/warnings/advisories... 
California...none. 
Northwest California coastal waters... 
Small Craft Advisory until 6 PM PST Wednesday pzz450-455. 


Gale Warning from 10 PM this evening to 3 PM PST Monday pzz470. 


Gale Warning from 10 PM this evening to 10 PM PST Monday pzz475. 


&& 


$$ 


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