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Area Forecast Discussion (AFD)

Issued by Pendleton, OR (PDT)

FXUS66 KPDT 190634

Area Forecast Discussion
National Weather Service Pendleton OR
1022 PM PST Fri Jan 18 2019

.SHORT TERM...Warm front moving across the Pacific northwest  
this evening associated with a low pressure system offshore. 
Precipitation has overspread much of the forecast area within the 
past few hours as the front continues to move northeast. Expect 
rain and mountain snow through the remainder of the evening and 
overnight. Adjusted forecast earlier to lower snow levels with the
onset of precipitation. Currently have snow at Stampede Pass and 
Meacham. With continued warm advection snow levels should 
gradually rise overnight. Southerly winds have increased in the 
Grande Ronde valley and will remain windy there overnight. The 
offshore low will push a cold front into the region Saturday 
however it will become stationary just to our south. Precipitation
will taper off for a short time during the day. A surface low 
will then develop on the front and move across the area Sat night 
into Sunday with another round of rain and mountain snow. 
Temperatures will be colder with lower snow levels at this time. 

.AVIATION...06z tafs. Steady rain will continue over the Taf sites 
for the remainder of the night. Ceilings 020-050. Winds 5-15kt. 
Precipitation will taper of Saturday morning. Ceilings 030-060. 


.PREV DISCUSSION... /issued 251 PM PST Fri Jan 18 2019/ 

SHORT TERM...A storm system was moving into the pacnw and
spreading clouds over the area. The latest radar was showing
showers developing along the wa/or cascades and this will migrate
east into the remainder of the area overnight. Snow will
accumulate but remain below advisory criteria across the higher 
elevations before snow levels increase above 3500 feet overnight.

The pcpn amounts will increase into Saturday morning that may 
fill rivers and streams will rapidly running water this weekend.
As the bulk of the system moves east Saturday afternoon...some
drier will move into the western portions of the region. Meanwhile
another surge of moisture is forecast to drift north and keep the
showers persisting Saturday night and Sunday before slowly
drifting away Monday. However showers will linger in the area 
mountains. Temperatures will be above normal Saturday and cool 
several degrees Monday and Tuesday but remain near normal. 

LONG TERM...Monday night through Friday...An upper level ridge will 
build offshore Monday night with precipitation limited to the 
mountains. A warm front will be moving into the ridge and spreading 
precipitation across the area Tuesday with snow levels around 1000-
2000 ft Tuesday morning rising to 4000-5000 ft Tuesday evening. Snow 
levels will remain at these levels through Wednesday before the cold 
front moves through late Wednesday. High pressure and drying 
conditions area expected Thursday and Friday. It will be fairly mild 
through the week with the warmest day expected Wednesday with highs 
about 3-5 degrees above normal. Coonfield 


PDT  41  49  38  40 /  90  40  50  70 
ALW  41  51  40  43 /  90  40  40  80 
PSC  40  51  38  43 /  90  20  40  80 
YKM  33  44  32  43 /  90  20  30  40 
HRI  40  51  38  42 /  90  20  50  80 
ELN  31  41  31  39 /  90  30  30  30 
RDM  35  48  34  40 /  90  50  70  60 
LGD  34  42  37  42 / 100  80  60  70 
GCD  33  45  38  43 / 100  70  80  70 
DLS  36  48  37  42 / 100  50  50  70 


OR...Wind Advisory until 10 AM PST Saturday for ORZ049.