Area forecast discussion 
National Weather Service Pendleton or 
1040 PM PDT Tuesday Sep 2 2014 

Updated the aviation discussion 

Update...some showers were making there way across the Cascades and 
into portions of the Kittitas and Yakima valleys and have updated 
the zones to include isolated rain this evening. Otherwise due to 
improving relative humidity the rfw was allowed to expire. Also some brief wind 
gusts around 45 miles per hour could develop in and near showers. Otherwise the 
present short term forecast appears on track for now. 

Aviation...breezy west to northwest winds will persist across most 
taf sites before lessening after 10z. Otherwise mainly VFR 
conditions can be expected through Wednesday. 


Previous disc... /issued 735 PM PDT Tuesday Sep 2 2014/ 

Update...surface winds continue to be breezy across the basin this 
evening as a disturbance tightens pressure gradients and tracks to 
our north bringing cooler temperatures. The winds should persist for 
a few more hours before lessening as the disturbances moves east. 
Otherwise a stronger band of showers were nearing our Washington 
Cascades which could produce a clap of thunder around the Easton and 
Cle Elum areas this evening and have updated the zones to reflect 
this. Otherwise a Wind Advisory remains in effect until 9 PM around 
the eln area and the present short term forecast appears on track 
for now. 

Previous disc... /issued 442 PM PDT Tuesday Sep 2 2014/ 

Short term...tonight through Friday...a system out of the Gulf of 
Alaska will continue to swing across British Columbia and northern 
Washington tonight. This system will push a cold front across the 
region late this afternoon and this evening. Moisture with this 
system is limited and will continue to mention varying chances of 
precipitation over the Washington Cascade east slopes through tonight. Will 
also continue to mention a few showers in the northern Blue 
Mountains due to upslope affects tonight and Wednesday morning. 
Winds will continue to increase this afternoon due to the front. The 
strongest winds will be across the Kittitas Valley and will continue 
the Wind Advisory. Breezy to windy conditions will occur elsewhere, 
especially across the basin and in the Columbia River gorge. Still 
expect some patchy blowing dust near open fields over portions of 
the basin into early evening. Uncertainty remains as to how the 
winds will interact with these open fields, so will continue to 
monitor for possible lower visibilities in the blowing dust. The 
latest system will continue to swing east across Montana Wednesday. 
This will lead to skies clearing from the southwest through the day. 
Also any lingering precipitation chances will end by afternoon. High temperatures 
will be up to 10 degrees cooler than today. A mainly dry northwest 
to north flow will persist over the region Thursday into Friday. 
Thus expect fair and dry conditions with mostly sunny days. High 
temperatures will gradually warm each day reaching to the middle 80s over the 
Columbia Basin on Friday. 90 

Long term...Friday night through Tuesday...models show our area 
under a ridge Friday night and Saturday with a weak closed low off 
of northern California. See little chance of any precipitation as 
high pressure will dominate. Upper flow will turn from northwest to 
northeast and give US generally light northeast winds Saturday. 
Models also show a trough approaching the area on Sunday and moving 
into the area Sunday night or Monday. There is not a lot of moisture 
with this system but expect a slight chance of showers mainly along 
the Cascades and perhaps along the higher mountains of eastern 
Oregon on Monday. The trough moves off to the east Monday night and 
a northwest flow will continue over the area as a ridge reforms out 
in the eastern Pacific. Have kept a slight chance of upslope showers 
in the Cascades and the higher eastern Oregon mountains Monday 
through Tuesday. Temperatures will be in the 80s with middle 70s to 
lower 80s in the mountains Saturday and Sunday then cool to the 70s 
to lower 80s with 70s Monday and Tuesday. Perry 

Fire weather...a dry cold front will push across the interior Pacific 
northwest this afternoon and evening. Expect winds 20 to 25 miles per hour 
across or/Washington 641...this in combination with low relative humidities 
will create critical fire weather conditions. A red flag warning 
will continue through 8 PM this evening for these zones. All other 
areas can expect 10 to 20 miles per hour winds...but relative humidities are 
not expect to be low enough for critical fire weather conditions. 89 


Preliminary point temps/pops... 
PDT 50 73 47 78 / 10 0 0 0 
alw 54 73 52 79 / 10 10 0 0 
psc 54 77 46 80 / 10 0 0 0 
ykm 46 75 44 78 / 20 0 0 0 
hri 52 77 44 80 / 10 0 0 0 
eln 52 75 44 80 / 20 0 0 0 
rdm 35 72 33 77 / 0 0 0 0 
lgd 45 69 39 75 / 10 10 0 0 
gcd 42 72 38 77 / 10 0 0 0 
dls 55 76 49 85 / 10 0 0 0 


PDT watches/warnings/advisories... 


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