Weather Service Report

FXUS66 KPDT 200413

Area Forecast Discussion
National Weather Service Pendleton OR
913 PM PDT Mon Mar 19 2018

.UPDATE...A weak low pressure system will move into oregon from
the west overnight. Some moisture was associated with the low and
some showers are possible in and near central Oregon before
moving east tomorrow morning. Temperatures were slow to fall and
these have been adjusted. Meanwhile temps were modified and pushed
up a degree or two and the present short term forecast appears on


.PREV DISCUSSION... /issued 350 PM PDT Mon Mar 19 2018/ 

SHORT TERM...Tonight through Thursday...Seeing some shallow cumulus 
buildups over the mountains this afternoon that could produce a few 
light showers through this evening before dissipating around sunset. 
Watching the small weak upper level low pressure system off the 
Oregon Coast. Models show this moving inland across central Oregon 
overnight and exiting Tuesday. There could be some light 
precipitation associated with it or just some clouds so just 
indicating a low chance of precipitation. Southwest flow aloft will 
begin to increase Tuesday night and Wednesday as a stronger upper 
level low pressure system begins to drop south from Alaska and down 
the Canadian coast. The southwest flow will begin to advect moisture 
from another low pressure system off the California coast into the 
Pacific Northwest Wednesday and Thursday. This will increase the 
chance of precipitation across the forecast area and raise snow 
levels to 4000 to 6000 feet. Finally, the low moving down the 
Canadian coast will push a cold front into the forecast area 
Thursday afternoon. Will see some increasing breezy southerly winds 
ahead of the front and then switching to westerly behind it.   

LONG TERM...Thursday Night through Monday...Unsettled weather will 
continue through much of the long term period. Thursday night will 
see a large upper low and trough centered offshore with a front 
exiting the area overnight. The area will have a chance of rain in 
the lower elevations and a chance of rain with snow above 4000 feet 
in the mountains in the evening. Winds will be breezy in the 
evening. Overnight snow levels will be lowering to around 2500 feet 
and this will give the mountains a slight chance of snow while the 
lower elevations dry out. Friday through Saturday the trough will 
come ashore and over our area. A series of impulses will keep a 
chance of mainly snow in the mountains and central Oregon while the 
Columbia Basin will be mainly dry. Snow levels will be down to 1000 
to 2000 feet. Saturday night and Sunday the trough will move off to 
the east and a transitory ridge will develop offshore. Precipitation 
will taper off but the mountains will still have a chance of light 
snow. Sunday will be a mainly dry day with the ridge overhead. 
Monday will see another front moving into the area with a slight 
chance of rain and snow in the lower elevations and a chance of snow 
in the mountains. Temperatures will be in the lower to mid 50s with 
upper 30s and 40s in the mountains through the period. Perry

AVIATION...00Z TAFs...VFR conditions will continue at all TAF sites 
for the next 24 hours. Few to scattered mid and high clouds this 
afternoon will become mainly clear tonight. An exception will be in 
central Oregon including KBDN and KRDM where a weak disturbance will 
create increasing clouds late this afternoon and early evening. 
Expect broken to overcast skies at 4000-6000 feet tonight with -SHRA 
from 03Z-10Z. Cloud cover will start decreasing after 10Z and go 
mostly clear by 15Z. Winds will remain below 12 kts for the next 24 
hours. Perry


PDT  32  57  35  62 /  10  10  10  20 
ALW  34  58  38  61 /  10  10  10  20 
PSC  31  62  36  63 /   0  10  10  20 
YKM  31  61  33  60 /   0   0   0  20 
HRI  32  60  34  63 /   0  10  10  20 
ELN  30  57  32  55 /   0   0   0  20 
RDM  27  54  34  57 /  20  20  20  50 
LGD  31  50  36  55 /  20  20  10  30 
GCD  35  51  36  57 /  20  20  20  50 
DLS  39  63  41  61 /  10  10  10  20 





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