Area Forecast Discussion
Issued by NWS Pendleton, OR

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583
FXUS66 KPDT 191124 AAB
AFDPDT

Area Forecast Discussion...Updated
National Weather Service Pendleton OR
424 AM PDT Wed Sep 19 2018

Updated Aviation Discussion

.SHORT TERM...Today through Friday night...A mid to upper level
longwave trough will be over the Pacific Northwest today and then
move east into Idaho/Montana tonight. A weak disturbance in the base
of the trough will bring variable high clouds to the region today.
Otherwise, dry conditions will continue through Thursday night for
most of the forecast area due to a ridge of high pressure moving
across the region tonight through Thursday night. The next system
will bring a warm front and a chance of rain to the Washington
Cascades east slopes Thursday night and Friday morning followed by a
chance of showers along the east slopes of the Washington Cascades
Friday afternoon ahead of a cold front that moves into the forecast
area Friday night. As such the central and southern east slopes of
the Washington Cascades as well as the east slopes of the Oregon
Cascades will have a chance of showers Friday night. However, expect
a dry cold front passage for the remainder of the forecast area
Friday night.  Polan

.LONG TERM...Saturday through Tuesday...An upper trough still looks
to slowly swing across British Columbia and the Pacific Northwest
Saturday into Sunday. Moisture still looks to be limited with this
trough. Thus will only mention low end chances of showers, mainly
over the higher terrain. Temps should be near to slightly below
seasonal Saturday and Sunday. Mid range models appear to be falling
in line with the idea of a strong upper ridge developing offshore
with a dry northwest flow over the region Monday and Tuesday. Thus
will indicate dry conditions with near to slightly above seasonal
temps for this period. 90

&&

.AVIATION...12Z TAFs...An upper trough over the region this morning
will gradually shift east during the next 24 hours. Moisture is
quite limited with this system, with the bulk of it 25,000 ft MSL
and above. Thus all TAF sites will see varying amounts of cirrus
clouds during this period. There may also be a few clouds around 8-
9,000 ft AGL. Winds will generally be 15 kts or less with the
strongest winds at KDLS. Also winds will peak late morning into the
evening. 90

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  72  47  71  48 /   0   0  10   0
ALW  73  48  72  50 /   0   0  10   0
PSC  76  48  75  49 /   0   0  10   0
YKM  73  44  72  46 /   0  10  10  10
HRI  75  47  74  48 /   0   0  10   0
ELN  72  45  70  45 /   0  10  10  20
RDM  70  34  72  39 /   0   0   0   0
LGD  69  39  69  41 /   0   0  10   0
GCD  69  40  69  44 /   0   0  10   0
DLS  73  49  73  50 /   0  10  10  10

&&

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

$$

99/90/90



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