Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 231140 AAA
AFDPDT

Area Forecast Discussion...Updated
National Weather Service Pendleton OR
440 AM PDT Sun Apr 23 2017

Updated Aviation Discussion

.SHORT TERM...Today through Tuesday...A west-northwest upper level
flow will develop today the eastern Pacific and the Pacific
Northwest, then continue through the remainder of this period. A
disturbance moving into northern California this morning will move
across the region today. Thus will see an increase in chances of
showers late this morning into this afternoon. May be enough
instability for a stray thunderstorm over southern Wallowa county
this afternoon. A stronger system within this upper level flow will
move into the region Monday. Thus expect scattered to numerous
showers over the area. This precip will keep high temps Monday well
below seasonal. Instability over portions of the eastern mountain
zones will be strong enough for a few afternoon thunderstorms.
Tuesday will see a break and a decrease in shower chances as the
region will be between the Monday system and another system expected
Tuesday night. 90

.LONG TERM...Tuesday Night Through Saturday...Models are in good
agreement that a moist west to northwest flow will be over the
region Tuesday through Thursday. The moist westerly flow will allow
a series of weather systems to impact the WA and OR with showers,
occasionally breezy conditions, and  cooler than normal
temperatures. Rain shadowing will limit pops in the lower Columbia
Basin, Yakima and Kittitas Valleys, and Deschutes Plateau. Thursday
night through Saturday an upper level ridge will build offshore and
slowly shift east to the coast. Showers will decrease Thursday night
and Friday as an upper level trough moves into ID. Dry conditions
will prevail by Saturday as the building ridge influences WA and OR.
Coonfield

&&

.AVIATION...12Z TAFs...VFR conditions will be likely though
MVFR cigs are possible after 18-20Z near showers. 76

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  60  41  55  39 /  30  40  60  40
ALW  63  45  57  43 /  30  40  60  50
PSC  67  46  61  43 /  20  20  40  30
YKM  64  41  60  38 /  30  30  40  20
HRI  65  43  59  40 /  20  30  50  30
ELN  59  39  57  38 /  30  30  40  20
RDM  55  35  53  33 /  30  40  60  40
LGD  56  38  51  37 /  50  60  60  70
GCD  57  39  52  36 /  60  60  80  60
DLS  61  44  57  43 /  40  50  60  50

&&

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

$$

90/76/76



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