Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 301656 AAA
AFDPDT

Area Forecast Discussion...UPDATED
National Weather Service Pendleton OR
956 AM PDT Thu Mar 30 2017

Updated Preliminary Point Temps/Pops Section

.SHORT TERM...Morning Update...An upper level trough will continue
to move across the western U.S. today. The trough axis currently
extends from north-central Washington south to north-central
California. The trough axis will be along the Washington/Oregon/
Idaho border by late this afternoon. The upper level flow is still
southerly over much of the area, but has become north-northwesterly
over the Cascades. This north-northwest flow will gradually spread
east across the remainder of the region today. Numerous showers
continue across our eastern most zones with isolated to scattered
showers along the Cascade crest, and from central Oregon northeast
into the Blue Mountain foothills. Conditions are currently fair and
dry elsewhere. With increasing cold air aloft today, will continue
to see scattered to numerous showers continuing through the
afternoon over the locations currently seeing this condition. Will
also see a few showers develop this afternoon in some areas that are
currently dry. Winds will be breezy to windy across the area today.
Winds in the Columbia River Gorge and the Kittitas Valley should see
at least local sustained winds around 30 mph. At this time will
continue to hold off on wind advisories for these two areas until
actual trends reveal the extent of the stronger winds. Expect rises
on local rivers to continue into this afternoon, then these levels
should begin to fall late in the afternoon and this evening. 90

.LONG TERM...Previous Discussion...Saturday an upper ridge over the
area will be flattening as a system moves over the ridge into our
area. The morning will be dry and in the afternoon and evening there
will be a chance of rain showers along the Cascades and eastern
Oregon mountains while the rest of the area remains dry. Showers
will taper off to just a slight chance of rain overnight. Snow
levels will be over 7000 feet for this system. Sunday morning will
be dry but Sunday afternoon and night a trough will cross the area
with a chance of rain and snow showers in the mountains with snow
levels starting out at 5500 feet and dropping to 4000-4500 feet.
There will also be a slight chance of showers in the Blue Mountain
Foothills and Central Oregon. Showers will taper off in the eastern
mountains Monday morning as a ridge builds over the area. This will
keep the area dry Monday afternoon through Tuesday evening. Another
system will be approaching Tuesday night and will move the ridge off
to the east. There will be a chance of showers along the Cascade
Crest late Tuesday night. Models have some timing differences with
the GFS bringing the system across the Cascades Wednesday and the
ECMWF Wednesday night. Both bring rain across the area through
Thursday. Have a chance of rain with snow levels over 6000 feet for
the entire area Wednesday through Thursday. Temperatures Saturday
will be in the mid 50s to mid 60s then cool to the upper 40s and 50s
Sunday and Monday. Tuesday through Thursday will warm to the 50s and
lower 60s.

&&

.AVIATION...Previous Discussion...12Z TAFs...VFR conditions will be
prevalent for the next 24 hours. Scattered to broken ceilings above
7000 feet will become few to scattered this afternoon and tonight.
An exception is KRDM and KBDN which will have scattered to broken
ceilings at 4000-7000 feet through this afternoon before clearing
tonight to just some high cirrus. KRDM and KBDN will have VCSH this
morning and KPDT and KALW will have VCSH this afternoon. Wind will
be the major aviation concern today as all TAF sites will see winds
increase this morning to 10-20 kts with gusts to 30 kts before
decreasing after 02Z. An exception is KDLS which will reach 20-30
kts with gusts to 35 kts through 03Z before decreasing to below 12
kts by 05Z.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  51  32  52  35 /  30  20   0   0
ALW  52  38  52  40 /  30  20   0   0
PSC  60  34  59  38 /  10  10   0   0
YKM  63  32  59  37 /  10   0   0  10
HRI  58  34  57  35 /  20  20   0   0
ELN  57  31  57  36 /  10   0   0  10
RDM  46  19  50  24 /  30  10   0  10
LGD  48  34  50  28 /  50  20  10   0
GCD  47  30  52  30 /  70  20   0   0
DLS  60  36  60  39 /  20   0   0  10

&&

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

$$

90/83/77



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