Area forecast discussion...update 
National Weather Service Pendleton or 
1032 am PDT Tuesday Sep 30 2014 

Updated aviation discussion 

Short term...cold front has moved well east of the region however 
upper level trough with cool cyclonic flow will remain over the 
region today. Northwest upslope flow will keep skies mostly cloudy 
over the Cascades and blues with isolated showers through evening. 
Remainder of the forecast area mostly clear now but expect some 
cumulus to develop with the cooler air aloft. Breezy to locally 
windy conditions through the day. Strongest winds in The Gorge and 
Kittitas Valley. Diminishing clouds and winds tonight with cool 
temperatures. Some locations will drop below freezing...especially 
central and northeast Oregon. 94 

Aviation...18z tafs...VFR conditions expected at all taf sites 
through the period. Main concern today will be gusty west to 
northwest winds behind an exiting cold front. Winds will be between 15 
to 30 kts through 01/03z before diminishing to at or below 10 kts overnight. 
MVFR haze and/or areas of blowing dust in vicinity of of kpdt is possible 
through 01/03z...but will not include in tafs due to uncertainty. 
Vicinity showers near kpdt and kalw due to passing shortwave between 
01/00z to 01/04z. Murphy/bieda 


Previous disc... /issued 109 am PDT Tuesday Sep 30 2014/ 

Short through Thursday...a cold front which moved 
across the County Warning Area last evening brought some rain showers to the eastern 
County Warning Area. These have moved off to the east. Winds have picked up with and 
behind the front to locally breezy to windy. The winds are expected 
to increase further today. Winds in the Kittitas Valley are expected 
to reach Wind Advisory speeds around 15-16z this morning. Will be 
issuing a Wind Advisory from 15z-00z today for the Kittitas Valley 
as a result. The strongest winds will occur during times of maximum 
mixing this afternoon. After that time the winds are expected to 
diminish quickly tonight as pressure gradients relax and due to 
night time stabilization of the atmosphere. The next concern will be 
cold temperatures tonight and Wednesday night. Temperatures tonight 
in central Oregon (madras...Redmond and bend) are all expected to 
drop to or below freezing. Will be issuing a freeze warning there 
for tonight. On Wednesday night temperatures will not be as cold. On 
Wednesday cool temperature will continue in a northwest flow aloft. 
After that an upper ridge will begin to build back over the region 
beginning on Thursday with a warming trend. 88 

Long term...Thursday night through Tuesday...a ridge of high 
pressure will build over western North America through the forecast 
period. This will place the forecast area in fast westerly flow 
aloft resulting in some cloud cover but little in the way of 
precipitation. It will be warm with temperatures above normal for 
this time of year. On Saturday...a weak disturbance will flatten the 
ridge and perhaps push a weak cool front across the region from the 
north. The models are showing limited moisture with this feature so 
for now have confined probability of precipitation to the Washington Cascade crest. Any 
moisture over the area will be short lived...with a return to dry 
conditions for early next week. 78 


Preliminary point temps/pops... 
PDT 65 39 66 40 / 10 10 0 0 
alw 66 42 66 44 / 10 10 0 0 
psc 71 39 69 41 / 10 0 0 0 
ykm 66 35 67 41 / 10 0 0 0 
hri 69 37 68 40 / 10 0 0 0 
eln 62 39 63 38 / 10 0 0 0 
rdm 61 27 63 31 / 0 0 0 0 
lgd 58 35 62 36 / 20 10 0 0 
gcd 58 29 63 34 / 10 10 0 0 
dls 67 43 68 44 / 10 10 0 0 


PDT watches/warnings/advisories... 
or...freeze warning from 10 PM this evening to 9 am PDT Wednesday 

Washington...Wind Advisory until 5 PM PDT this afternoon waz026. 


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