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Area Forecast Discussion (AFD)

Issued by Pendleton, OR (PDT)

FXUS66 KPDT 172258

Area Forecast Discussion
National Weather Service Pendleton OR
358 PM PDT Mon Jun 17 2019

Updated Aviation Discussion

.AVIATION...00Z TAFs...Just thin cirrus passing through from time
to time for all terminals except DLS where marine layer stratus 
may occasionally work its way through the Gorge early Tuesday. 
Breezy conditions are expected through and downwind of gaps 
through the Cascades this evening, with a bit stronger winds 
Tuesday afternoon/evening as a weak marine push further enhances 
cross-Cascade thermally driven diurnals. Strongest winds will be
seen at DLS with 20-25KT sustained. Peck


.PREV DISCUSSION... /issued 300 PM PDT Mon Jun 17 2019/ 

SHORT TERM...Tonight through Thursday. A weak disturbance will clip
the northeast corner of the forecast area this evening. A shower or 
t-storm may develop over Wallowa County into the early evening but 
not expecting any widespread or strong activity. Otherwise the 
forecast will be dry into Thursday with a cold front crossing the 
area on Tuesday and another on Wednesday. This will knock the 
temperatures down a few degrees Tuesday and substantially on 
Wednesday. High temperatures Wednesday will only be in the 70s with 
60s in the mountains. On Thursday an upper level trough will cross 
the area but the NW trajectory will limit the amount of available 
moisture. Shower chances will be mostly confined to the NE mountains 
and the WA Cascade crest region. it will remain cool with High 
temperatures in the mid 60s to mid 70s with upper 50s to mid 60s 
mountains. It will be windy in the Cascade gaps on Tuesday and 
more widespread higher winds on Wednesday. Wind Advisories could be 
needed especially in the Kittitas Valley. 78 

LONG TERM...Thursday Night through Monday...Models have come into 
better agreement in the long term period. Thursday night a large 
trough be over the Pacific Northwest with a northwest flow overhead. 
There will be a slight chance of showers from the Blue Mountain 
Foothills eastward into Wallowa county. There will also be a slight 
chance of thunderstorms in the evening in Wallowa county. Breezy 
winds of 10 to 20 mph in the early evening will decrease overnight. 
The trough will shift east Friday and bring a more northerly flow 
through Saturday evening. This period will be dry aside from a 
slight chance of showers in Wallowa county. By Sunday a zonal 
westerly flow will be overhead as an upper low and trough approaches 
the British Columbia coast. This will bring a slight chance of 
showers to the Cascades and the eastern Oregon mountains along with 
a slight chance of afternoon thunderstorms from the Blue Mountains 
eastward. Sunday afternoon looks as if it will be breezy as well. 
The low and trough will sink south to the Washington/Oregon coast 
Monday and a slight chance of showers will be over most of the area 
with the exception of the Columbia Basin which will be mainly dry. 
Temperatures Friday will be in the 70s and lower 80s with mainly 60s 
in the mountains. Temperatures will rebound Saturday and Sunday to 
the mid 70s to mid 80s with upper 60s to mid 70s in the mountains. 
Monday will be a couple of degrees cooler. Perry

FIRE WEATHER...Red Flag Warnings are in effect for WA675 from 
Tuesday afternoon through Wednesday evening for winds and low RH. 
On Tuesday the RFW conditions will be mostly north but be more 
widespread on Wednesday. Fire Weather Watches are in effect for 
the Columbia Basin of Oregon and Washington for Wednesday 
afternoon and evening. Winds will pick up substantially Wednesday 
afternoon and early evening along with low rh which will 
potentially result in Red Flag conditions. 78 


PDT  57  84  51  75 /   0   0   0   0 
ALW  63  88  57  79 /   0   0   0   0 
PSC  62  89  55  81 /   0   0   0   0 
YKM  59  86  51  76 /   0   0   0   0 
HRI  62  88  55  80 /   0   0   0   0 
ELN  60  78  55  68 /   0   0   0   0 
RDM  48  82  42  75 /   0   0   0   0 
LGD  54  80  49  72 /   0   0   0   0 
GCD  52  84  47  75 /   0   0   0   0 
DLS  62  82  56  74 /   0   0   0   0 


OR...Fire Weather Watch from Wednesday afternoon through Wednesday 
     evening for ORZ641.

WA...Fire Weather Watch from Wednesday afternoon through Wednesday 
     evening for WAZ641.

     Red Flag Warning from 2 PM Tuesday to 9 PM PDT Wednesday for