Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 030455
AFDPDT

Area Forecast Discussion...updated aviation
National Weather Service Pendleton OR
733 PM PST Tue Mar 2 2021

.UPDATE...Latest satellite imagery showed high cloudiness and not
much else. Dry westerly flow remained over the region, and made some
adjustments to temps based on the current guidance on observations.
Otherwise, forecast looks on track.

&&

.AVIATION...06Z TAFs...Just passing cirrus clouds through the period
with diurnally terrain driven winds 5-10kts.

&&

.PREV DISCUSSION... /issued 330 PM PST Tue Mar 2 2021/

SHORT TERM...Tonight through Thursday...Dry zonal flow aloft
today and tonight will keep conditions calm and dry across the
forecast area. Can expect Wednesday morning temperatures be in
the upper 30s to low 30s, though downsloping winds out of the
Blues may keep foothill areas in the mid to upper 30s. Tomorrow,
westerly flow aloft will give way to a warmer and dry
southwesterly flow as an upper level trough deepens over the
eastern Pacific and ridging strengthens over central CONUS.
Conditions will continue to be mild and calm with afternoon highs
in the upper 50s to lower 60s, 40s to low 50s mountains, for
Wednesday. Thursday, southwesterly flow aloft will continue to
filter in warmer air into the region, however, trough in the
eastern Pacific will start to push inland while a leading frontal
boundary will stall west of the Cascades. There will be increasing
mid to high level cloud cover as trough approaches, while the
Cascade crests may see an isolated shower or two turning into snow
flurries overnight Thursday. Afternoon highs will likely be in
the 60s across much of the lower elevations Thursday, while
mountain zones will again be in the 40s to low 50s. Lawhorn/82

LONG TERM...Friday through Tuesday. Upper low approaching the
Pacific northwest on Friday with a frontal boundary into western
Washington and Oregon. Precipitation will likely overspread the
Cascades during the day. Remainder of the forecast area will be
partly to mostly cloudy and warm. 850mb temps near 8C and breezy
south winds will push highs into the upper 50s and 60s. Mixing
down of stronger winds aloft will likely result in locally windy
conditions. Upper trough and front move through Fri night and
Saturday with a chance of rain and mountain snow. Cooler temps
with highs back into the 40s and 50s. Breezy conditions will
continue becoming more westerly. Another upper low will then move
slowly across the region later Sunday into Mon and Tue. Expect
mostly cloudy skies with occasional light rain and mountain snow.
Temperatures closer to normal levels with highs in the 40s to mid
50s. Snow levels will be 2-4k feet. 94

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  37  59  33  63 /   0   0   0   0
ALW  38  60  35  63 /   0   0   0   0
PSC  31  61  33  62 /   0   0   0   0
YKM  31  57  31  59 /   0   0   0   0
HRI  35  62  33  64 /   0   0   0   0
ELN  28  53  30  54 /   0   0   0   0
RDM  29  60  28  62 /   0   0   0   0
LGD  32  47  29  51 /   0   0   0   0
GCD  31  55  29  58 /   0   0   0   0
DLS  36  61  35  63 /   0   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...

OR...None.
WA...None.

&&

$$

UPDATE.......77
SHORT TERM...82
LONG TERM....94
AVIATION.....84


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