Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 250326
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
825 PM PDT SAT SEP 24 2016

.SHORT TERM...Tonight through Tuesday...Very Little impacts from the
weather the next few days, except perhaps the lower humidity and
higher than normal temperatures to affect fire weather conditions.
00z NAM continues trend of all previous models in building ridge
across the Pac NW.  Ridge axis moves across the area Sunday night
and Monday. Lowering heights and increasing westerly flow will cause
a slow cooling trend beginning Tuesday, but temperatures will likely
remain above normal for a few days even beyond Tuesday.

&&

.AVIATION...06z TAFS...VFR conditions to prevail due to building
ridge and dry stable conditions with light winds.


&&

.PREV DISCUSSION... /issued 500 PM PDT SAT SEP 24 2016/

SHORT TERM...Tonight through Tuesday. Despite some high level
clouds tonight a high pressure system will dominate the areas
weather with dry conditions into the beginning of next week. A
warming trend is expected each day as temperatures climb into the
80s across many locations and the warmest day should occur on
Monday. A weak disturbance will move across the region on Tuesday
and bring mainly mid/high level clouds. Afternoon high temperatures
will remain above normal through the period.

LONG TERM...Tuesday night through Saturday...An upstream mid/upper
level trough in the Gulf of Alaska amplifies Tuesday night and
Wednesday while digging south between 130-140W while the downstream
upper ridge over the Pacific Northwest loses amplitude. Forecast
area remains dry through Thursday night with the aforementioned
trough approaching he coast Thursday night. Friday and Saturday
increasing PoPs over region as the long wave mid/upper level trough
reaches the near offshore waters backing flow aloft to the south and
transporting increasing moisture east of the Cascades for a chance
of showers in the mountains and a slight chance of showers at lower
elevations.  Polan

AVIATION...00Z TAFs...A building mid/upper level ridge offshore
will keep conditions dry and VFR at all TAF sites through the next
24 hours.  Warm air advection aloft will cause increasing amounts of
BKN mid level clouds over the area with cloud bases lowering
overnight to 7000-12000 ft AGL. Expect light drainage winds tonight
with upslope winds Sunday afternoon. Winds through the period will
be less than 10 kts.  Polan

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  46  78  50  85 /   0   0   0   0
ALW  49  78  55  85 /   0   0   0   0
PSC  46  80  52  86 /   0   0   0   0
YKM  43  82  45  87 /   0   0   0   0
HRI  45  80  49  85 /   0   0   0   0
ELN  44  81  45  84 /   0   0   0   0
RDM  34  84  41  88 /   0   0   0   0
LGD  44  79  46  84 /   0   0   0   0
GCD  43  81  45  85 /   0   0   0   0
DLS  49  84  50  89 /   0   0   0   0

&&

.PDT Watches/Warnings/Advisories...
OR...None.
WA...None.
&&

$$

79/99/79


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