Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 221749
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
1049 AM PDT Sun Oct 22 2017

.SHORT TERM...Today and tonight...Weather system is winding
down and will be transitioning to decreasing showers through this
afternoon mainly over the mountains. Ridge of high pressure will
begin to build into the region pushing the system out of the area
and then remain over the ares through the first of the week.
Lingering effect of the system will be some breezy conditions
through this evening and then winds decrease overnight. Also saw
some major rainfall along the crest of the Washington Cascades
overnight which spilled over onto the east slopes of the Cascades
causing creeks, stream and rivers to rise. The Yakima River in the
Elk Meadow subdivision is expect to rise above bankfull today
resulting in some minor flooding. A flood warning has been issued
for this through this evening.


&&

.AVIATION...18Z TAFs...Rain is winding down this morning and will
end this afternoon. Showers continue over the mountains and in
central Oregon including KBDN and KRDM. Rain has ended at other TAF
sites. Ceilings will be gradually improving today and generally VFR
though KRDM and KBDN may have MVFR conditions at times through 21Z.
Otherwise ceilings will be broken becoming scattered above 5000 feet
agl. Winds remain at 10 to 20 kts with gusts to 30 kts through this
afternoon though it will be decreasing over time. Winds will drop
below 12 kts after 02Z this evening. Perry


&&

.PREV DISCUSSION... /issued 455 AM PDT Sun Oct 22 2017/

SHORT TERM...Today through Tuesday...A cold front is sagging
south into Kittitas County. A flash flood watch is in effect for
the Jolly Mountain and Norse Peak burn scar areas on the east
slopes of the Washington Cascades through this morning for the
moderate to heavy precipitation with the front. Precipitation
will decrease this morning behind the front in the Yakima and
Kittitas Valleys and Lower Columbia Basin of Washington. The
front will be along the Blue Mountains this afternoon with likely
rain. Rain showers will persist into the evening from central OR
to Wallowa County.

Pressure gradients are tight this morning along and ahead of the
front. Stronger winds aloft are mixing to the surface...
particularly on ridges. Wind advisories have been issued for the
Simcoe Highlands...North Central and Central OR...and the
foothills of the Blues.

An upper level ridge will build offshore Sunday night and
Monday...then shift slowly east Tuesday. This will bring clearing
skies and lighter winds Monday. Patchy fog will develop early
Tuesday in the Columbia Basin due to radiational cooling at the
surface and and strengthening inversions due subsidence from the
ridge. Coonfield

LONG TERM...Tuesday night through Saturday...High pressure Tuesday
night gives way to a fast moving upper shortwave bringing a chance
of showers to the Blue Mountains Tuesday afternoon through Tuesday
evening. A strong high pressure ridge builds offshore between 130-
140W Thursday through Saturday for dry conditions. High temps
Wednesday will be in the upper 50s to mid 60s and then cool down to
50 to 60 on Thursday. Highs Friday and Saturday will be in the mid
50s to lower 60s.  Polan

AVIATION...12Z TAFs...VFR conditions at all TAF sites in
clouds and rain at KPSC, KPDT and KALW with rain ending by 18Z this
morning. KDLS and KYKM may have MVFR until 15Z. Winds 20-30 kts and
brief wind gusts to 35 kts will continue into Sunday evening for all
taf sites. Polan

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  66  44  64  40 /  30   0   0   0
ALW  67  46  63  43 /  30   0   0   0
PSC  70  42  63  40 /  10   0   0   0
YKM  65  38  62  36 /  10   0   0   0
HRI  69  43  64  39 /  20   0   0   0
ELN  59  37  59  38 /  10   0   0   0
RDM  64  39  66  35 /  60  10   0   0
LGD  57  40  59  37 / 100  10   0   0
GCD  57  43  62  38 /  90  20   0   0
DLS  68  43  67  42 /  40  10   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.

&&

$$

91/83/83


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