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Area Forecast Discussion (AFD)

Issued by Pendleton, OR (PDT)

                            
000
FXUS66 KPDT 242358 AAA
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
458 PM PDT Wed Apr 24 2019

UPDATED AVIATION DISCUSSION

.SHORT TERM...Tonight through Saturday...A low amplitude ridge of 
high pressure will be over the area through Thursday before a fast 
moving shallow trough pushes a cold front through the area on 
Friday. Temperatures will be the warmest Thursday and then cool 
Friday and Saturday as cooler air arrives on breezy westerly winds 
behind the frontal passage. Most of the moisture associated with 
this trough stays north of the forecast area but could see a few 
showers in the Washington Cascades and in the northern Blue 
Mountains on Friday but very light precipitation amounts.  

.LONG TERM...Saturday night through Wednesday. Long term period 
begins with the PacNW under northwest flow with stronger low/trough 
continuing to slide southeast across eastern OR/WA and on towards 
ID/MT Saturday night into Sunday. Some minor timing and placement 
differences between model guidance, but expect a slight chance of 
showers for the weekend, mainly over the WA Cascades and the 
northern Blues and Wallowas. West to northwest winds expected to be 
breezy at times through the weekend ahead and behind the backdoor 
cold front, with the strongest winds Saturday afternoon into the 
evening. Temps will also be cooler for Sunday with highs in the 
lower 50s to lower 60s. Beyond the weekend, models diverge a bit, 
but the general trend is for a reinforcing low/trough, within a 
deepening longwave trough over the western US, to drop south out of 
BC and settle over the PacNW Monday and Tuesday, then slowly 
shifting eastward on Wednesday. Expect at least a chance for showers 
Monday into Tuesday, mainly over the mountains. Temps look to 
continue the cooler trend next week with highs in the 50s to mid 60s 
and lows in the 30s to low 40s. Winds could be gusty at times as 
well.

&&

.AVIATION...00Z TAFS...VFR conditions are expected through the 
period. Will see an increase of cirrus overnight into Thursday. 
Expect light winds of less than 10 kts through the next 24 hours.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  43  72  48  66 /   0   0   0  10 
ALW  44  74  50  69 /   0   0   0  10 
PSC  45  76  51  73 /   0   0   0  10 
YKM  44  71  49  69 /   0   0   0   0 
HRI  44  75  50  71 /   0   0   0  10 
ELN  39  68  45  61 /   0   0   0   0 
RDM  40  75  42  65 /   0   0   0   0 
LGD  38  72  44  62 /   0   0   0  10 
GCD  41  75  44  63 /   0   0   0  10 
DLS  45  75  48  67 /   0   0   0   0 

&&

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

$$

91/84/84