Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 170928
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
228 AM PDT Mon Jun 17 2019

.SHORT TERM...Today through Wednesday...A weak upper ridge will keep
dry conditions for most of the forecast area today. The exception
will be Wallowa County where there will be just enough of an
increase of moisture and instability for possible afternoon showers
and isolated thunderstorms. The rest of the forecast are will remain
dry. Then on Tuesday there will be an increase in mid to upper level
winds as a jet stream maximum sags southward into the Pacific
Northwest with a broad upper trough. With afternoon mixing, these
stronger winds aloft will mix down to the surface...especially in
north central Oregon and south central Washington along the Cascade
east slopes. Winds will also increase on Wednesday afternoon for the
same reason. The combination of these stronger winds with low
humidities and dry fine fuels will lead to fire weather concerns and
the possible need for fire weather watch/warning highlights for the
lower elevations. Temperatures today will be several degrees cooler
than Sunday, then a few more degrees cooler on Tuesday, and then 8
to 10 degrees more cooler on Wednesday behind a dry cold front as
that upper jet stream sags southward and allows cooler air into the
forecast area and the fire weather district. Moisture will be very
limited and there will likely not be any rain with this system and
mainly just an increase in winds and cooler temperatures with some
mid and high clouds. 88

.LONG TERM...Wednesday night through Sunday. A low pressure system
to the north will tighten pressure gradients over the region and
produce breezy to windy conditions across our area Wednesday night
and Thursday. Meanwhile a weak low pressure system will track across
Oregon that could produce some showers for the region on Thursday
aftn/night especially over the eastern half of the area that
includes the blues/wallowas. The showers linger into Friday and
Saturday before a break in between systems on Sunday. Temperatures
will be below normal but increase several degrees into the weekend.

&&

.AVIATION...vfr conditions will persist at all taf sites for the
next 24 hours.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  87  57  83  52 /   0   0   0   0
ALW  90  62  87  56 /   0   0   0   0
PSC  92  63  88  58 /   0   0   0   0
YKM  90  59  85  52 /   0   0   0   0
HRI  92  61  87  55 /   0   0   0   0
ELN  84  58  77  51 /   0   0   0   0
RDM  83  50  81  46 /   0   0   0   0
LGD  82  55  79  50 /  20   0   0   0
GCD  84  52  82  50 /   0   0   0   0
DLS  87  60  81  55 /   0   0   0   0

&&

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

&&

$$

88/97/97



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