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Area forecast discussion 
National Weather Service Pendleton or
224 PM PDT Friday Jul 29 2016

Short term...tonight through Tuesday...sunny and hot conditions
prevail this afternoon under high pressure...with most lower
elevation locations rising well into the 90s. 100-105 looks good for
highs in the basin/foothills late this aftn. A cold front will push
across the region late tonight/Saturday. No deep moisture to work will keep all areas dry with just a few clouds. High
temperatures Saturday will not be nearly as hot as modified marine
air works in...with lower/mid 90s for lowland locations and 80s for
the mtns. In the wake of the front...breezy/windy conditions will
develop by Saturday afternoon. Wind speeds will approach advisory
criteria across the Kittitas Valley...but with some uncertainty of
strength and with limited duration...will not issue an advisory at
this time. Dry and seasonably warm conditions will prevail for
Saturday night into Monday under dry westerly flow. Upper level low
pressure will approach the upper Washington coast by Monday night...crossing
northern Washington on Tuesday. The greatest moisture/lift will reside to
the north of the low across southern British Columbia/northern Washington. Sufficient deep
layer moisture does clip the Washington Cascades to warrant a slight chance
to low end chances of showers Monday night/Tuesday. Any instability
looks to be confined to the west of the Cascade crest as the low
will move east/NE as it crosses Washington...thus will keep thunderstorms out
of the forecast. Another round of breezy to locally windy conditions
can be expected the with approach/Crossing of the low. Temperatures
will cool further in the wake of the low...with highs Tuesday below
normal...mainly in the lower/mid 80s for the lower elevations.

Long term...Tuesday night through Friday...dry mainly westerly
flow will prevail for mid/late week. Temperatures will gradually
warm initially near normal for Wednesday...and above normal for


Aviation...00z tafs...VFR/skc conditions will prevail for the next
24 hours. Winds will remain generally 10 knots or less for psc/PDT/alw
into Saturday...increasing Saturday afternoon to 15-20 knots with a few
gusts to 30 knots. For the other sites...expect breezy conditions for
most of the period...with gusts to 30 knots at times.


Fire flag warnings are in effect late this afternoon
through Saturday evening for gusty winds and low 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). The Fire Weather Watch in effect for the Columbia Basin
zones down to central Oregon (wa675, Washington/or639, and or640) will be
upgraded to red flag warnings in effect from 1 PM to 9 PM Saturday.
Taking a closer look at Sunday...the winds will not be strong enough
to extend the warning for an additional day. Fire zone 644 which
covers the southern Blue Mountains... Grande Ronde Valley and the
northern portion of the John Day basin is currently under a watch
but will be cancelled. Conditions are not expected to meet red flag
criteria in this zone but there will be local winds around 10-15 mph
along with relative humidity values around 10-15 percent that is a
concern but the potential for extreme fire behavior is low. Wister


Preliminary point temps/pops...
PDT 63 93 57 87 / 0 0 0 0
alw 69 94 63 88 / 0 0 0 0
psc 67 97 61 90 / 0 0 0 0
ykm 67 95 58 90 / 0 0 0 0
hri 66 95 60 89 / 0 0 0 0
eln 63 87 57 85 / 0 0 0 0
rdm 53 91 45 88 / 0 0 0 0
lgd 57 92 51 85 / 0 0 0 0
gcd 58 94 52 89 / 0 0 0 0
dls 65 88 60 86 / 0 0 0 0


PDT watches/warnings/advisories... flag warning until 9 PM PDT Saturday for orz610-639.

Red flag warning from 1 PM to 9 PM PDT Saturday for orz640-641. flag warning until 9 PM PDT Saturday for waz639.

Red flag warning from 1 PM to 9 PM PDT Saturday for waz641-675.




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