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Area Forecast Discussion (AFD)

Issued by Pendleton, OR (PDT)

                            
000
FXUS66 KPDT 170928
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
228 AM PDT Mon Jun 17 2019

.SHORT TERM...Today through Wednesday...A weak upper ridge will keep 
dry conditions for most of the forecast area today. The exception 
will be Wallowa County where there will be just enough of an 
increase of moisture and instability for possible afternoon showers 
and isolated thunderstorms. The rest of the forecast are will remain 
dry. Then on Tuesday there will be an increase in mid to upper level 
winds as a jet stream maximum sags southward into the Pacific 
Northwest with a broad upper trough. With afternoon mixing, these 
stronger winds aloft will mix down to the surface...especially in 
north central Oregon and south central Washington along the Cascade 
east slopes. Winds will also increase on Wednesday afternoon for the 
same reason. The combination of these stronger winds with low 
humidities and dry fine fuels will lead to fire weather concerns and 
the possible need for fire weather watch/warning highlights for the 
lower elevations. Temperatures today will be several degrees cooler 
than Sunday, then a few more degrees cooler on Tuesday, and then 8 
to 10 degrees more cooler on Wednesday behind a dry cold front as 
that upper jet stream sags southward and allows cooler air into the 
forecast area and the fire weather district. Moisture will be very 
limited and there will likely not be any rain with this system and 
mainly just an increase in winds and cooler temperatures with some 
mid and high clouds. 88

.LONG TERM...Wednesday night through Sunday. A low pressure system 
to the north will tighten pressure gradients over the region and 
produce breezy to windy conditions across our area Wednesday night 
and Thursday. Meanwhile a weak low pressure system will track across 
Oregon that could produce some showers for the region on Thursday 
aftn/night especially over the eastern half of the area that 
includes the blues/wallowas. The showers linger into Friday and 
Saturday before a break in between systems on Sunday. Temperatures 
will be below normal but increase several degrees into the weekend. 

&&

.AVIATION...vfr conditions will persist at all taf sites for the 
next 24 hours.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  87  57  83  52 /   0   0   0   0 
ALW  90  62  87  56 /   0   0   0   0 
PSC  92  63  88  58 /   0   0   0   0 
YKM  90  59  85  52 /   0   0   0   0 
HRI  92  61  87  55 /   0   0   0   0 
ELN  84  58  77  51 /   0   0   0   0 
RDM  83  50  81  46 /   0   0   0   0 
LGD  82  55  79  50 /  20   0   0   0 
GCD  84  52  82  50 /   0   0   0   0 
DLS  87  60  81  55 /   0   0   0   0 

&&

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

&&

$$

88/97/97