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Area forecast discussion 
National Weather Service Pendleton or
204 am PDT sun may 3 2015

Short term...today through Tuesday...a west to northwest flow aloft
will keep conditions dry and stable for another day today with warm
temperatures. Expect maximum temperatures today to be in the middle to
upper 70s in the lower elevations...with mostly 60s in the
mountains. The flow will then become southwest on Monday as an upper
trough off the coast begins to move into the region. The southwest
flow will help to bring more unstable air with increasing moisture
into the region. There could be some afternoon thunderstorms over
the eastern mountains Monday afternoon and evening...but just a
slight chance. The upper trough will move into the region and
forecast area on Tuesday with instability and moisture increasing
further...resulting in a slight chance of afternoon and evening
thunderstorms in a more widespread area. The best chance for
thunderstorms on Tuesday will be over the Cascade east slopes and the
adjacent valleys east of the Cascades. Temperatures will be slightly
warmer on Monday and then they will cool off on Tuesday due to more
cloud cover and the chance of showers. Winds will remain light today
and most of Monday. Then they will begin to increase Monday
afternoon and evening as surface pressure gradients increase.
Locally breezy to windy conditions will develop on Tuesday as the
weather system moves into the region...especially in the Kittitas
Valley and the eastern Columbia River gorge. Unsettled weather will
persist into the extended forecast period. 88

Long term...Tuesday night through Saturday...unsettled weather to
move across the area for the extended. Models are coming better in
line for the Middle Range. The low pressure system will move inland on
Tuesday night centering over the Pendleton County warning area by Wednesday evening.
Thunderstorm chances look best over the east slopes of the Cascades
with showers elsewhere...but that could change as model instability
continues to shift every day with the repositioning of the low. By
Wednesday...with the low overhead...the chances for thunder will be
just about everywhere. Still have low confidence that thunder will
occur over the basin...so have left just slight chance showers for
that area. As the low dives south over the Nevada/California boarder on
Thursday...return flow along central Oregon and the northeast
mountains will provide the best chances for thunder...with showers
elsewhere. By Friday the low will be nearly centered over the Las
Vegas area...with a deformation zone over the southern portion of
the County Warning Area. So have kept slight chance thunder over the northeast
mountains. Due to uncertainty in the models for Saturday Onward
have not made any adjustments to the previous forecast. As it
stands slight chance thunder remains mainly over The Eagle caps and
the Elkhorn Mountains. Weber

&&

Aviation...12z tafs...VFR conditions will prevail for the next 24
hours. Occasional high clouds will be possible especially early to
middle morning today. Winds will remain at or below 10 kts for the next 24
hours...except at kbdn and krdm where gusts to near 15 kts could
occur between 03/21z and 04/03z. Weber

&&

Preliminary point temps/pops...
PDT 74 42 77 46 / 0 0 0 0
alw 77 46 80 47 / 0 0 0 10
psc 78 41 81 49 / 0 0 0 0
ykm 77 42 77 44 / 0 0 0 10
hri 78 41 80 49 / 0 0 0 0
eln 75 40 76 43 / 0 0 0 0
rdm 76 37 75 38 / 0 0 0 10
lgd 73 39 77 41 / 0 0 20 20
gcd 78 38 80 41 / 0 0 10 10
dls 81 42 77 47 / 0 0 0 10

&&

PDT watches/warnings/advisories...
or...none.
Washington...none.

&&

For additional weather information, check our web site at...
www.Weather.Gov/Pendleton

$$

88/89/89

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