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Area forecast discussion 
National Weather Service Pendleton or
300 am PDT Sat Jul 30 2016

Short term...today through Monday afternoon...a dry cold front will
usher in a marine push that will transport slightly cooler Pacific
air into the region for some relief from the hot temperatures that
occurred yesterday. Highs on today will be 7-9 degrees cooler than
friday's highs. Increasing pressure gradients associated with the
cold front will bring breezy conditions in the lower Columbia Basin
to north central Oregon this afternoon into this evening with
windy conditions in the eastern Columbia River gorge. There may be
some patchy blowing dust in the lower Columbia Basin and along
the foothills of the Blue Mountains this afternoon. The cooling
trend and dry conditions will continue on Sunday for highs 81 to 91,
except in the mid 60s to lower 80s in the mountains. A mid upper
level low approaches the coast Monday backing flow aloft to the
SW resulting in high temperatures Monday a few degrees warmer. Polan

Long term...Monday night through Saturday...an upper low pressure
system off the Washington coast will work its way inland Monday
night and Tuesday. This will result in lowering heights, thicknesses
and 850 mb temperatures which will result in a cooling trend. On
Tuesday maximum temperatures will only be in the lower to mid 80s in
the lower elevations which will be about 6 to 8 degrees below
normal. This system will have very little moisture with it...but
there may be enough for some isolated showers and afternoon
thunderstorms over the central Washington Cascade east slopes Monday
night through Tuesday night. The rest of the County Warning Area will remain dry. It
will also become locally breezy to windy...mainly along the Cascade
east slopes and through the Cascade gaps and passes. As the upper
low pushes east on Tuesday into Wednesday the flow will become west
to northwest again resulting in dry conditions...with a warming
trend through Friday. By Friday afternoon the flow will become
southwest again which will bring up some moisture and instability
from the south. Though moisture will be limited again there may be
enough, with instability, for a few showers and afternoon
thunderstorms over the Wallowa and Elkhorn Mountains Friday
afternoon through Saturday. Elsewhere will be dry and temperatures
will be around normal for the time of year Friday and Saturday. 88

&&

Aviation...12z tafs...VFR conditions will prevail with mostly clear
skies. Temperatures will not be as hot today as was on Thursday. It
will become breezy to windy at kdls...kpdt...kalw and possibly kykm
with wind speeds anywhere from 15 to 25 kts. Elsewhere winds will be
mostly light and 15 kts or less. 88

&&

Fire weather...red flag warnings are in effect through this evening
for gusty winds and low relative humidity for the fire zones
covering the eastern Columbia River gorge and the east slopes of the
northern Oregon Cascades (fire zones Washington/or639 and or610). Red flag
warnings are also in effect from 1 PM to 9 PM today for the Columbia
Basin zones down to central Oregon (wa675, Washington/or639, and or640).
Taking a closer look at Sunday...the winds will not be strong enough
to extend the warning for an additional day. Conditions are not
expected to meet red flag criteria elsewhere but there will be local
winds around 10-15 mph along with relative humidity values around 10
to 15 percent that will be a concern, but the potential for extreme
fire behavior will be low.

&&

Preliminary point temps/pops...
PDT 94 57 87 57 / 0 0 0 0
alw 94 63 87 62 / 0 0 0 0
psc 97 61 90 59 / 0 0 0 0
ykm 95 58 90 58 / 0 0 0 0
hri 97 60 89 58 / 0 0 0 0
eln 88 57 85 56 / 0 0 0 0
rdm 91 45 88 47 / 0 0 0 0
lgd 92 51 85 49 / 0 0 0 0
gcd 94 52 88 52 / 0 0 0 0
dls 88 60 86 60 / 0 0 0 0

&&

PDT watches/warnings/advisories...
or...red flag warning until 9 PM PDT this evening for orz610-639.

Red flag warning from 1 PM this afternoon to 9 PM PDT this
evening for orz640-641.

Washington...red flag warning until 9 PM PDT this evening for waz639.

Red flag warning from 1 PM this afternoon to 9 PM PDT this
evening for waz641-675.

&&

$$

99/88/88

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