Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 231716
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
1016 AM PDT Thu Mar 23 2017

Updated aviation discussion

.SHORT TERM...Today and Tonight...Mostly sunny skies this morning
followed under high pressure. The mid/upper level ridge moves
into Idaho in the afternoon, which allows flow aloft to back to
the southwest which will give way to increasing high clouds this
afternoon followed by a cold front ushering in a chance of
showers, mainly after midnight. Polan

.AVIATION...18Z TAFs...VFR conditions will prevail today with mostly
dry conditions. Then another weather system will move in tonight
with increasing clouds and showers from the west. This may result in
brief periods of MVFR in lower CIGS and visibility.

&&

.PREVIOUS DISCUSSION... /issued 226 AM PDT Thu Mar 23 2017/

SHORT TERM...Today through Saturday...A flat and transitory
ridge will remain over eastern WA and OR will move into MT this
afternoon. Today will be dry with mostly clear to partly cloudy
skies. Clouds will increase late this afternoon as the next system
moves inland. Precipitation will cross the Cascades this evening
though the bulk of the rain will be Friday. Around 0.2 inch of
precipitation is expected in the lower Columbia Basin and 0.75-1.00
inch in the mountains.

Snow levels will be 3500-5000 ft across the CWA tonight and Friday,
then drop to 2500-4500 feet Saturday night and Sunday. Snow
accumulations are expected to be 4 to 7 inches for the higher
mountains, but remain below 3 to 6 inches in areas where winter
weather headlines are issued.

Area rivers will fall today, then rise again Friday with the next
round of precipitation. Grande Ronde at Troy and John Day at Service
Creek are currently below flood stage, but flood warnings have been
continued because those locations are expected to rise above flood
stage again Friday. Coonfield

LONG TERM...Saturday night through Thursday...The extended will
remain unsettled with frequent weather systems. Model to model and
run to run differences leaves enough uncertainty to make timing
difficult of individual systems therefore have at least a slight
chance to chance pops for each day in the extended period. It will,
however, begin mostly dry on Saturday night and Sunday morning,
except for possible rain or snow showers in the mountains. The next
system to bring substantial rain will be Sunday night into Monday
followed by a drier ridge pattern on Tuesday. On Wednesday another
weather system will move into the region with more rain and high
mountain snow. Temperatures will be near to slightly below normal
through the period and winds will be mostly light...except breezy at
times on the ridge tops and with showers. 88



&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  57  39  53  39 /   0  50  90  40
ALW  58  42  53  41 /   0  50  90  50
PSC  60  42  55  41 /   0  50  80  20
YKM  57  39  55  36 /   0  60  50  20
HRI  60  40  55  40 /   0  50  80  20
ELN  54  35  49  34 /   0  70  50  20
RDM  55  37  53  33 /   0  60  60  20
LGD  54  38  51  36 /   0  50  80  70
GCD  55  37  51  34 /   0  60  80  50
DLS  58  42  55  41 /  10  60  80  20

&&

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

$$

99/76/88



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