356 
FXUS66 KPDT 080538 AAA
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
1035 PM PDT Thu Oct 7 2021

updated the aviation discussion

.UPDATE...A long wave trough was passing through the two state
area tonight and the latest ir satl was showing some mid and high
level clouds moving into the se portions of the region. Also a 
few showers were nearing this area and the models were suggesting 
a further push north and had added some mention of showers that
were mostly confined to the blue/wallowas overnight. Otherwise
overnight low temps are expected to fall mostly into the 30s and
the present short term forecast appears on track.

AVIATION...vfr conditions are expected to continue across all taf 
sites for the next 24 hours. However a weather system may increase 
mid level clouds and some showers could near taf sites kpdt and kalw 
between 15z to 18z.

&&

.PREV DISCUSSION... /issued 430 PM PDT Thu Oct 7 2021/ 

SHORT TERM...Tonight through Saturday...A split upper level trough 
pattern will continue over the region tonight through Friday before 
the trough moves off to the east on Saturday. The southern portion 
of the trough will be the dominate feature as it moves into 
California Friday and then into the Great Basin Saturday. A 
southwest flow ahead of the trough axis will advect some moisture 
across far eastern Oregon late tonight and Friday generating a few 
light showers. A brief ridging pattern will follow the trough 
passage on Saturday for overall dry conditions. Temperatures will 
remain seasonable through the short term. Some areas of near 
freezing temperatures will be possible again tonight with areas of 
frost but no freeze warnings expected. 

LONG TERM...Sunday through Thursday...The upper level ridge will 
quickly move off to the east on Sunday as the next Gulf of Alaska 
system moves into western Canada and the Pacific Northwest. This 
will increase chances of precipitation across the forecast area 
Sunday. Precipitation will taper off Sunday night into mountain 
showers which will linger into Monday. Snow levels will lower to 
3000 to 4000 feet during this time with some light snow 
accumulations possible in the mountains and higher transportation 
routes. The trough moves off to the east late Monday and Tuesday 
with another transitory ridge of high pressure passing over the 
region. This will give way to yet another upper level trough system 
coming out of the Gulf of Alaska and more precipitation chances 
Wednesday into Thursday.  

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  36  62  36  64 /   0   0   0   0 
ALW  37  63  39  66 /   0  10   0   0 
PSC  38  66  38  67 /   0   0   0   0 
YKM  34  64  35  64 /   0   0   0   0 
HRI  37  66  37  67 /   0   0   0   0 
ELN  33  61  35  60 /   0   0   0   0 
RDM  30  62  28  63 /   0   0   0   0 
LGD  38  60  32  59 /  10  20  10   0 
GCD  40  63  31  61 /  20  10   0   0 
DLS  41  67  42  66 /   0   0   0   0 

&&

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

$$

SHORT TERM...97
LONG TERM....99
AVIATION...97