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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Thursday
• 
• High: 57 °
• Low: 36 °
• Chance Rain

• Friday
• 
• High: 57 °
• Low: 36 °
• Chance of Rain

• Saturday
• 
• High: 61 °
• Low: 39 °
• Chance of Rain

• Sunday
• 
• High: 63 °
• Low: 43 °
• Partly Cloudy

• Monday
• 
• High: 59 °
• Low: 43 °
• Chance of Rain

Area forecast discussion...updated 
National Weather Service Pendleton or 
1027 PM PDT Wednesday may 22 2013 


Updated aviation discussion 


Update...shower are decreasing in intensity and coverage over 
eastern Washington and Oregon with the loss of daytime heating. An 
upper level low is still spinning west of Yakima and Ellensburg. 
Some showers will persist overnight in the unstable air 
associated with this low. Freezing temperatures will develop in 
parts of central Oregon..the higher elevations of the southern 
foothills of the Blue Mountains...and the Grande Ronde Valley. A 
freeze warning is in effect for the southern foothills and Grande 
Ronde Valley tonight and tomorrow morning. As the low drifts west 
tomorrow showers will redevelop in eastern Washington and Oregon 
with the strongest showers in Oregon. Coonfield 


&& 


Aviation...06z tafs...VFR conditions conditions will prevail 
tonight. Showers will remain isolated overnight then increase again 
after 20z. The heaviest showers will be near rdm and bdn, but 
showers are possible at all taf locations. MVFR conditions are 
possible near showers 21-03z. Winds will be generally less than 10 
kts until 18z. 76 


&& 


Previous discussion... /issued 333 PM PDT Wednesday may 22 2013/ 


Short term...tonight through Saturday...a deep closed low continues 
to spin over central Washington. Snow will gradually decrease 
across northern Klickitat County above 2500 feet into early this 
evening. Winter Storm Warning remains in effect until 8 PM. 


The cold airmass associated with this system will bring temperatures 
down to the upper 20s across the southern foothills of the Blue 
Mountains and Grande Ronde Valley of Oregon. A freeze warning has 
been issued for these areas. Central Oregon will also freeze under 
the effects of the unseasonably cold air...but freeze warnings are 
not normally issued for those areas until after June 1. 


Short term models in good agreement with upper low wobbling around 
the Pacific northwest through Friday and then lifting out Friday 
night. As such...very cool and scattered showery conditions will 
prevail Thursday. Showers will likely show an increase on late 
Thursday night and Friday and the low tracks northeast from central 
Oregon to northern Idaho. A drier westerly flow should prevail for 
all areas on Saturday...except the crest of the Washington/or Cascades and 
the eastern mountains where a few showers will linger. 


Long term...Saturday night through Wednesday night...upper level 
trough will continue to circulate over the Pacific northwest for the 
extended. It does show signs of weakening and warmer air 
intruding...but overall unsettled weather can be expected every 
day...with the better chances of showers and possibly thunderstorms 
to be over the mountains. Models do hint at a weak wave to push 
through Saturday evening...which might generate a few mountain 
thunderstorms across northeast Oregon. As the center of the low 
pushes northward for the majority of the work week...the forecast 
area for the most part will be in a zonal flow. This will support 
near normal temperatures...but also a chance for showers each day. 
Models do hint at another potentially strong cold front to move 
through on Wednesday afternoon. The system that is moving in looks 
to have a slight negative tilt...along with cape values and lifted indice's 
indicate the potential for thunder. Therefore have made a slight 
chance mention into the forecast for Wednesday. Weber 


&& 


Preliminary point temps/pops... 
PDT 34 59 42 60 / 20 20 20 50 
alw 36 63 44 61 / 20 20 20 40 
psc 37 65 45 66 / 20 20 20 40 
ykm 36 63 43 65 / 60 20 20 40 
hri 34 65 45 63 / 20 20 20 50 
eln 34 61 41 63 / 60 30 30 40 
rdm 25 55 35 55 / 20 20 50 40 
lgd 30 57 38 54 / 30 30 30 50 
gcd 28 54 35 51 / 30 30 30 50 
dls 38 62 46 62 / 20 20 50 50 


&& 


PDT watches/warnings/advisories... 
or...freeze warning from 2 am to 9 am PDT Thursday orz508. 


Freeze warning from 11 PM this evening to 9 am PDT Thursday 
orz049. 


Washington...none. 


&& 


Threat index 
Thursday : green 
Friday : green 
Saturday : 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 


$$ 


76/76/76