Scientific Forecaster Discussion

Return to Local Conditions & Forecast

Without Abbreviations
With Abbreviations

Area forecast discussion 
National Weather Service Pendleton or
230 PM PDT Friday Aug 29 2014

Short term...tonight through Monday. An upper level trough will
move across the Pacific northwest tonight into Saturday. A weak
frontal boundary associated with the upper trough will move through
tonight. This will result in mostly cloudy skies...with a few
showers over the Cascades and blues. Partly cloudy on Saturday and
much cooler. High temperatures will be down 5-10 degrees from today. Breezy
westerly winds again especially in the Columbia Basin and Kittitas
Valley. The forecast area will remain in a northwest flow aloft
Sunday and Monday. Models indicate another short wave moving through
Sunday afternoon into the overnight period. This will bring a return
to mostly cloudy skies with a chance of showers over the mountains.
Temperatures will remain closer to normal sun/Monday with highs mostly
in the 70s. 94

Long term...Monday night through Friday...Monday night a zonal
northwesterly flow will be over the area for fair and dry weather
through Tuesday morning. By Tuesday afternoon, an upper trough will
swing down into British Columbia and extend south into our area.
Most of the energy and moisture will remain to our north but there
will be a slight chance of showers along the Washington Cascade
crest. The central low will push off to the east on Tuesday night
but the trough will remain and slowly evolve through the rest of the
long term period. With a northwest flow over the area, have
continued to have a slight chance of showers over the Washington
Cascades through Wednesday evening while the rest of the area
remains dry. By Thursday, models start developing an offshore low in
the base of the trough and flow turns more to the northeast and
dries out further. Do not expect any precipitation Thursday through
Friday. Temperatures will start out in the 70s and lower 80s on
Tuesday, drop to the upper 60s and 70s Wednesday then warm a couple
of degrees each day arriving at the lower to middle 80s with 70s in the
mountains on Friday. Overnight lows will remain generally in the
upper 40s and 50s, though colder mountain locations will be in the
30s. Perry


Aviation...00z tafs...VFR conditions will be prevalent for
the next 24 hours. A disturbance is approaching the region and
mostly clear skies are giving way to increasing cirrus above 20000
feet above ground level. Scattered middle level clouds above 7000 feet above ground level will begin
moving into the area after 06z tonight and will remain through 00z
tomorrow. Winds will continue at 10 to 20 kts with higher gusts to
30 kts through 04z this evening. Winds will drop below 15 kts around
05z-07z this evening and will begin to increase again after 16z
tomorrow morning. After 20z, winds will reach 15 to 25 kts with
gusts to 30 kts at kdls and 10 to 20 kts with gusts to 25 kts at
other taf sites. Perry


Preliminary point temps/pops...
PDT 56 75 51 76 / 10 10 0 0
alw 59 76 56 77 / 10 10 0 10
psc 59 79 54 80 / 10 10 0 0
ykm 53 75 50 76 / 10 10 10 10
hri 58 79 53 79 / 10 10 0 0
eln 53 72 51 74 / 10 10 10 10
rdm 47 71 42 74 / 10 10 10 10
lgd 52 70 45 73 / 20 10 10 10
gcd 50 71 44 75 / 20 10 10 10
dls 59 77 56 78 / 10 10 10 10


PDT watches/warnings/advisories...

For additional weather information, check our web site at...



National Weather Service Glossary of Abbreviations