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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Monday
• 
• High: 45 °
• Low: 34 °
• Chance of Rain

• Tuesday
• 
• High: 45 °
• Low: 31 °
• Chance of Snow

• Wednesday
• 
• High: 45 °
• Low: 27 °
• Partly Cloudy

• Thursday
• 
• High: 49 °
• Low: 31 °
• Chance of Rain

• Friday
• 
• High: 52 °
• Low: 31 °
• Chance of Rain

Area forecast discussion 
National Weather Service Pendleton or 
244 am PST Monday Feb 13 2012 


Short term...today through Tuesday night...an elongated upper 
trough remains over the western U.S. Early this morning. The bulk of 
the energy within this trough is dropping south-southeast into 
northern California. A fair amount of cloud cover extends north to 
south from central Washington to south-central Oregon. Very light 
precipitation returns are showing up on radar over north-central and 
central Oregon, but so far very little precipitation has actually reached 
the ground as the air mass is still very dry. The area of heaviest 
precipitation has moved south out of southwest Oregon, thus expect only 
light precipitation today. Any precipitation that we get today will be associated 
with the remnants of the elongated upper trough as it moves east 
across the region. Have lowered probability of precipitation some for today most areas with 
the only areas still in the likely range are the Cascade east slopes 
this morning. Building surface high pressure may keep some showers 
going over the mountains and adjacent foothills tonight due to 
upslope affects. These showers should gradually decrease overnight. 
The region will be under a transitory upper ridge Tuesday morning 
for mostly dry conditions. The next Pacific system will move into 
the Pacific northwest Tuesday afternoon and move through the area 
Tuesday night. There remains considerable uncertainty as to the 
strength and track of this system. As such will keep a generally 
broad brush forecast going Tuesday afternoon through Tuesday night. 
90 


Long term...Wednesday through Sunday. A progressive pattern will 
continue for the region this week as upper level lows/troughs move 
across the Pacific northwest every few days. Models still having 
some difficulty coming into agreement on the track and timing of 
these features. As the Tuesday system departs the area an upper 
level ridge will build in on Wednesday with fair weather. The next 
system will move through on Thursday although this one looks pretty 
weak. Some light rain and mountain snow later in the day at best. 
Upper ridge builds back on Friday. A stronger upper low moves 
through over the weekend however the track on this one is still 
variable in the model data. Will keep forecast as is with a chance 
of rain and snow. With this type of pattern do not expect 
significant changes in temperatures day to day. Highs mostly in the 
40s with lows in the 20s and 30s. Widespread fog not likely to be an 
issue either. 94 


&& 


Aviation...previous discussion...06z tafs...a cirrus band continues 
to move in from the west this evening ahead of the next weather 
disturbance. Expect middle-level clouds to increase overnight. Rain 
will begin moving into kdls and a rain snow mix into krdm...with 
snow expected at kbdn around 06-09z. At this point ceilings may lower to 
MVFR or even some isolated IFR conditions. Kpdt...kpsc and kalw 
should not see showers until around 12z. Stratiform rain and snow 
will become more showery and begin to diminish Monday afternoon. 
Surface winds will be less than 10 kts. 


&& 


Preliminary point temps/pops... 
PDT 45 33 44 29 / 30 30 20 30 
alw 47 35 45 33 / 30 30 20 30 
psc 48 29 47 29 / 20 20 20 20 
ykm 43 26 44 24 / 40 10 20 30 
hri 47 28 46 28 / 20 20 20 30 
eln 42 27 42 25 / 40 10 20 30 
rdm 43 23 44 19 / 50 20 20 30 
lgd 44 28 43 27 / 30 40 30 30 
gcd 44 27 41 24 / 40 30 20 30 
dls 46 34 46 32 / 40 10 20 20 


&& 


PDT watches/warnings/advisories... 
or...none. 
Washington...none. 
&& 


Threat index 
today : green 
Tuesday : green 
Wednesday : green 


Green: none or limited need for watches, warnings, or advisories. 
Yellow: a few watches, warnings, or advisories possible or in effect. 
Red: numerous watches, warnings, or advisories possible or in effect. 


For additional weather information, check our web site at... 
www.Weather.Gov/Pendleton 


$$ 


90/94/94