Area forecast discussion 
National Weather Service Pendleton or 
230 PM PDT Sat Apr 19 2014 

Short term...tonight through Tuesday...a cold front is currently 
pushing light precipitation just east of the Cascades. Do not 
anticipate the rain reaching too far to the east due to rain 
shadowing. The eastern mountains may pick up some light rain later 
this afternoon and evening as the front moves across the area. Winds 
are increasing ahead of the front and expect this to continue 
through the afternoon and evening. Then the winds will decrease 
overnight behind the front. Sunday will be in between systems. A 
trough of low pressure will move toward the West Coast on 
Monday...turning the flow to the southwest. The front will push 
precipitation up to the Cascades by Monday afternoon and then across 
the entire region Monday night. The trough will follow inland for 
more showery conditions on Tuesday. Cooler air will move in with the 
trough on Tuesday with snow levels lowering to around 3500-4000 
feet. There is also a potential for an isolated thunderstorm or two 
due to some instability...moisture and cooler temperatures 
aloft...but cloud cover may inhibit development. Therefore have left 
them out of the forecast for now. Dmh 

Long term...Tuesday night through Saturday...Tuesday night a 
negatively tilted upper level trough moves across the forecast area 
with precipitation likely in the mountains and a chance of rain 
along the foothills of the Blue Mountains. The snow starts out near 
3500-4500 feet early Tuesday evening and then lowers to around 
3000-3500 feet overnight. The trough will exit into Idaho around 
daybreak Wednesday for decreasing probability of precipitation at lower elevations but with 
a chance of showers continuing in the Blue Mountains through 
Wednesday afternoon. Wednesday night a ridge of high pressure builds 
inland and Ushers in a warm front and attendant rain showers on 
Thursday. Thursday night a cold front moves to the Cascade crests 
and then enters forecast area and stalls over eastern Washington and 
central and northeast Oregon Friday through Saturday afternoon for 
periods of rain showers over the mountains. Polan 


Previous aviation discussion...18z tafs...VFR will prevail over the 
next 24 hours. Scattered to broken middle and high level clouds 
10000-20000 feet above ground level this morning will lower to broken 4000-7000 feet above ground level 
this afternoon followed by clearing skies this evening. Sustained 
winds will be 15-25 kts through this afternoon with gusts to 25-35 
kts in the afternoon. Winds diminishing this evening becoming 
drainage winds 8-12 kts by 09z/20th, except for winds at kpdt, which 
will be slower to decrease this evening and will remain out of the 
west at 10-20 kts finally backing to southerly drainage winds 6-10 
kts by around 13z/20th. Polan 


Preliminary point temps/pops... 
PDT 37 65 41 68 / 10 0 0 10 
alw 40 65 46 71 / 10 0 0 10 
psc 39 68 43 72 / 10 0 0 10 
ykm 34 66 40 68 / 20 0 0 20 
hri 36 68 41 71 / 10 0 0 10 
eln 36 65 39 66 / 20 0 0 20 
rdm 24 67 35 67 / 10 0 0 10 
lgd 34 62 38 68 / 20 0 0 10 
gcd 30 62 35 66 / 10 0 0 10 
dls 40 69 45 69 / 20 0 0 20 


PDT watches/warnings/advisories... 

Threat index 
Sunday : green 
Monday : green 
Tuesday : 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. 

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