Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 300346
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
846 PM PDT FRI JUL 29 2016

.SHORT TERM...Tonight through Tuesday...Made a few changes to the
winds for the next 6 hours based upon current observations. Airport
and mesonet obs show the leading edge of cooler air has advanced
to a line from Ellensburg- Yakima- Arlington-Bend. Occasional
gusty winds will continue with the push of the cooler air and will
be most noticeable in the Columbia Gorge vicinity and Kittitas
valley. These winds combined with dry vegetation, low humidity
will keep the need for a Red Flag Warning into Saturday. A dry
westerly flow continues to bring modified Pacific air into the
region for Sunday and Monday with near normal temperatures. An
upper level low pressure area passing through north central
Washington on Tuesday will give a fresh batch of cooler air, but
will likely be too far away to bring rainfall, except to the
central Washington Cascades.

&&

.AVIATION...06Z TAFS...VFR/SKC conditions will prevail for the
next 24 hours. Winds will remain generally 10 KT or less for
PSC/PDT/ALW into Saturday...increasing Saturday afternoon to 15-20
KT with a few gusts to 30 KT. For the other TAF sites...expect
breezy conditions for most of the period...with gusts to 30 KT at
times.


&&

.PREV DISCUSSION... /issued 224 PM PDT FRI 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
with...so 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 WA coast by Monday night...crossing
northern WA on Tuesday. The greatest moisture/lift will reside to
the north of the low across southern BC/northern WA. Sufficient deep
layer moisture does clip the WA 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 E/NE as it crosses WA...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
Thursday/Friday.

AVIATION...00Z TAFS...VFR/SKC conditions will prevail for the next
24 hours. Winds will remain generally 10 KT or less for PSC/PDT/ALW
into Saturday...increasing Saturday afternoon to 15-20 KT with a few
gusts to 30 KT. For the other sites...expect breezy conditions for
most of the period...with gusts to 30 KT at times.

FIRE WEATHER...Red 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 WA/OR639 and
OR610).  The Fire Weather Watch in effect for the Columbia Basin
zones down to Central Oregon (WA675, WA/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...
OR...Red Flag Warning until 9 PM PDT Saturday for ORZ610-639.

     Red Flag Warning from 1 PM to 9 PM PDT Saturday for ORZ640-641.

WA...Red 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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