Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 191713 AAA
AFDPDT

Area Forecast Discussion...Updated
National Weather Service Pendleton OR
1012 AM PDT Thu Jul 19 2018

Updated Aviation Discussion

.SHORT TERM...Morning Update...Westerly flow at the surface and
aloft will continue across the Pacific Northwest through at least
tonight. This flow is rather dry, though there has been some
increase in surface moisture due to a deeper marine layer west of
the Cascades. Overall expect sunny conditions with locally breezy
winds today. Smoke from wildfires in north-central Oregon will
gradually increase again across areas to the east of these fires.
Thus will continue to mention some amount of smoke over northeast
Oregon. Overall the forecast package is on track. Updates consisted
of a few adjustments to sky cover, smoke coverage and high temps. 90

.LONG TERM...Previous Discussion...With a low pressure system to the
north and a high pressure system to the south...our area will be in
between both systems but dry conditions are expected through the
weekend. As the low pressure moves away...the dry high pressure will
build further into or/wa and even warmer temps are likely for next
week.

&&

.AVIATION...18Z TAFs...VFR conditions are expected for the next 24
hours across all taf sites. However smoke from surrounding fires
could reduce vsby at times throughout the period especially at taf
sites kpdt...kalw...and possibly kdls. 76

&&

.FIRE WEATHER...The onshore flow has deepened the marine layer; 12Z
SLE shows the marine layer has deepened to around 4800 ft AGL. This
is good news for the Substation Fire that has received significantly
higher humidity compared to yesterday. KDLS currently at 65 pct RH.
The Kittitas Valley is also observing humidity values around 60-65
pct. Unfortunately, it is windy through these areas this morning and
sustained winds of 20-30 mph will continue through the afternoon and
early evening. Model guidance are all indicating the RH values
dropping to around 20 pct for the Eastern Columbia River Gorge. Red
Flag Warnings are in effect for south central WA and central and
north central OR. The marine push will cause winds to increase for
the remainder of the area as the day progresses with locally breezy
winds and RH around 12-20 pct. Friday and Saturday should be locally
breezy. I am not anticipating the extension of the Red Flag Warnings
at this time.  Wister

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  92  55  87  55 /   0   0   0   0
ALW  94  57  90  56 /   0   0   0   0
PSC  96  57  91  56 /   0   0   0   0
YKM  92  55  86  56 /   0   0   0   0
HRI  96  57  91  56 /   0   0   0   0
ELN  86  55  83  54 /   0   0   0   0
RDM  91  47  88  47 /   0   0   0   0
LGD  90  50  86  49 /   0   0   0   0
GCD  90  53  88  52 /   0   0   0   0
DLS  86  58  88  58 /   0   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...Red Flag Warning until 9 PM PDT this evening for ORZ639>641.

WA...Red Flag Warning until 9 PM PDT this evening for WAZ639-641-675.

&&

$$

90/97/76/85


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