Weather Service Report


211 
FXUS66 KPDT 202303 AAA
AFDPDT

Area Forecast Discussion...Updated
National Weather Service Pendleton OR
403 PM PDT Fri Jul 20 2018

Updated Aviation Discussion

.SHORT TERM...Tonight through Monday...Dry westerly flow will
persist through the short term period with a low pressure system 
passing to the north and high pressure to the south. Clear skies 
are expected during throughout the period. Patchy smoke from 
wildfires may affect visibility at times. High temperatures will 
be near normal saturday...then increase Sunday and Monday as an
upper level ridge builds offshore.  Coonfield

.LONG TERM...Monday night through Friday...The Pacific Northwest 
looks to be under the north side of a large upper ridge centered 
over the southwestern U.S. through this period. There is a 
difference between the GFS and the ECMWF during the Wednesday 
through Friday portion of this period. The GFS is currently stronger 
with a disturbance in the north stream, resulting in a suppression 
of the upper ridge heights over the PacNW. This disturbance is 
generally dry south of British Columbia. Thus the differences do not 
impact precip/thunderstorm potential, which looks to be none. It 
does impact the temperature forecasts with the GFS being 1-4 degrees 
cooler than the ECMWF. Will go with temps in between the two 
solutions. At this time the only day there could be a chance of 
storms worth mentioning is Tuesday. May have just enough instability 
and moisture over portions of central Oregon for stray thunderstorms 
on that day. 90 

&&

.AVIATION...00Z TAFs...A dry west-southwest upper level flow will 
persist across the Pacific Northwest during the next 24 hours. As 
such, will see VFR conditions with clear skies at all TAF sites. 
Smoke from area grass fires may drift over KPSC, KPDT and KALW at 
times. For now will not indicate any restrictions to cig/vis at this 
time as smoke appears mostly thin and aloft. Sustained winds this 
evening will generally run 10-20 kts with the strongest winds at 
KDLS. Lighter winds will occur overnight with influence from normal 
drainage. Winds will increase again late morning and afternoon 
Saturday, but will be lighter than today. 90 

&&

.FIRE WEATHER...Dry and breezy to locally windy conditions will 
continue through this evening across the eastern Columbia Gorge. 
Local and short-lived red flag conditions may be possible across far 
eastern sections of zone 639, but coverage/duration insufficient for 
a Red Flag Warning. Expect less wind for Saturday, with mainly light 
winds for Sunday through early next week. Mid level moisture will
increase across southern Oregon Sunday through early next week, but 
with layer RHs remaining limited for Central Oregon northward, do 
not expect any thunderstorms.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  55  86  55  91 /   0   0   0   0 
ALW  55  87  58  92 /   0   0   0   0 
PSC  54  89  56  93 /   0   0   0   0 
YKM  54  86  56  91 /   0   0   0   0 
HRI  54  90  55  94 /   0   0   0   0 
ELN  54  84  54  90 /   0   0   0   0 
RDM  44  86  45  92 /   0   0   0   0 
LGD  48  84  47  87 /   0   0   0   0 
GCD  49  86  50  90 /   0   0   0   0 
DLS  56  88  58  96 /   0   0   0   0 

&&

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

$$

76/90/90/80

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Western Regional Climate Center, wrcc@dri.edu