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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Friday
• 
• High: 61 °
• Low: 34 °
• Rain Showers

• Saturday
• 
• High: 64 °
• Low: 41 °
• Chance of Rain

• Sunday
• 
• High: 59 °
• Low: 36 °
• Chance of T-Storms

• Monday
• 
• High: 64 °
• Low: 39 °
• Mostly Cloudy

• Tuesday
• 
• High: 68 °
• Low: 39 °
• Mostly Cloudy

Area forecast discussion 
National Weather Service Pendleton or 
138 PM PDT Friday may 24 2013 


Short term...tonight through Memorial Day...the large low pressure 
system is currently elongating and shifting northward and is 
currently over Washington. Isolated to scattered showers are across 
much of Washington with a band of showers moving east in the 
foothills and the Blue Mountains of Oregon. Expect showers to 
gradually taper off tonight. Some instability this afternoon and 
evening may lead to a thunderstorm or two. The best shear for storm 
development is in central and northeast Oregon. Central Oregon 
however will lack upper level support due to the low moving further 
away but will keep an eye on northeast Oregon. Don't anticipate 
severe...but can not rule out a strong storm if enough clearing 
happens this afternoon and evening. 


The low will move out of the area with some drying and warming 
expected on Saturday. The overall pattern will remain a trough 
through the weekend with individual disturbances rotating through. 
The next one is expected to move into the Oregon portion of the 
region Saturday night into Sunday. The second system looks to impact 
the region on Memorial Day...though models are disagreeing on the 
exact timing of the system. Both systems will bring a chance of rain 
and some instability for the potential of afternoon thunderstorms 
over northeast Oregon and southeast Washington. Snow levels will 
rise through the weekend so precipitation will be in the form of 
rain except for the highest of peaks. Dmh 


Long term...Monday night through Friday...models in good agreement 
in continuing persistent unsettled weather pattern through the 
period. With some differences in timing and strength of each 
disturbance...will keep slight chance of showers in the basin with 
higher probability of precipitation over the mountains through Wednesday. By 
Thursday...models begin to differ quite significantly as GFS keeps a 
broad upper trough centered over the forecast area. Meanwhile... 
European model (ecmwf) develops an upper low over Washington and moves it southeast 
into Idaho Friday. At this time...will stick closer to the GFS/S 
drier forecast as it has been a little more consistent. In 
fact...European model (ecmwf) indicated the aforementioned low developing over Idaho 
the previous run. Temperatures will generally be below normal but 
gradually warming to near normal late in the period. Earle 




&& 


Aviation...00z tafs...VFR conditions will prevail through the 
forecast period. Isolated evening showers will dissipate by 25/04z. 
Showers will once again develop mainly over the mountains tomorrow 
afternoon. Winds 8-15 kts will diminish to less than 10 kts 
overnight then increase to 8-15 kts with higher gusts after 25/18z. 
Earle 




&& 


Preliminary point temps/pops... 
PDT 41 68 46 70 / 20 10 10 30 
alw 44 70 50 73 / 20 10 10 20 
psc 42 73 47 76 / 20 10 10 10 
ykm 43 68 46 72 / 20 10 10 10 
hri 42 72 47 75 / 10 10 10 20 
eln 42 64 44 70 / 20 10 10 10 
rdm 34 66 39 65 / 10 20 30 40 
lgd 36 64 40 67 / 20 20 20 40 
gcd 35 64 42 65 / 10 20 20 40 
dls 45 71 49 73 / 10 10 20 30 


&& 


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


Threat index 
Saturday : green 
Sunday : green 
Monday : 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 


$$ 


84/81/81