Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 240542 AAA
AFDPDT

Area Forecast Discussion...Updated
National Weather Service Pendleton OR
1042 PM PDT Wed May 23 2018

Updated Aviation Discussion

.SHORT TERM...Evening Update...A weak upper low over northeast
Washington will continue to shift east-northeast overnight. As such
will continue to see a decrease in shower coverage and most
thunderstorm chances end through the rest of the evening. An area of
showers over Klamath and Jackson counties is expected to drift north
and affect portions of central Oregon and the Ochoco-John Day
Highlands overnight. Otherwise may see a few lingering showers
across our other Oregon zones into the Washington Blue mountains.
Still expect dry conditions over most other Washington zones
overnight. An upper low will begin to develop off the California
coast, causing a weak upper ridge to build over the Pacific
Northwest by Thursday morning. Thus will continue to see warm temps
and moisture resulting in varying coverages of showers and a few
thunderstorms again Thursday. Updates focused on adjustments to
shower and storm coverages for the remainder of tonight. 90

.LONG TERM...Previous Discussion...Upper low pressure system will
remain nearly stationary over northeast Nevada through Sunday,
before weakening and shifting northeast on Monday. This will keep a
few linger showers and afternoon thunderstorm over extreme northeast
Oregon through Monday. Models continue to have some differences in
speed of a trough of low pressure to move through Monday night/
Tuesday with with a weak frontal system. Most of the moisture won`t
make it past the Cascades, with some slight chances of showers/
afternoon thunderstorms over the Blue Mountains. Main effect looks
to be a little cooler temperatures and some locally breezy winds.
Temperatures warm through the first part of the week and then cooler
a few degrees Tuesday and Wednesday, but remain above normal.

&&

.AVIATION...06Z TAFs...A weak upper level ridge will build over the
region during the next 24 hours. Moisture and warm conditions will
continue to lead to varying chances of showers and thunderstorms
over portions of the area. Thunderstorms will most likely occur from
central Oregon to the Blue mountains and Wallowa county Thursday
afternoon/evening. Confidence is low as to potential and timing of
showers/storms at KRDM and KBDN, thus will indicate a period of
vicinity showers. Will also include vicinity showers at KPDT and
KALW, though these will be most likely be to the east nearer the
mountains. The air mass at KPSC, KYKM and KDLS looks to be too
stable for any showers/storms. Winds will mainly be 6 to 16 kts with
strongest winds at KDLS. 90

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  59  83  57  78 /  30  20  20  20
ALW  61  85  59  79 /  30  30  20  20
PSC  62  88  60  83 /  20  10  10  10
YKM  60  87  59  82 /  20  10  10  10
HRI  62  87  59  82 /  20  10  20  20
ELN  57  85  55  80 /  20  10  10  10
RDM  51  79  51  66 /  60  40  50  50
LGD  53  78  52  74 /  20  50  40  30
GCD  54  78  52  70 /  50  40  50  70
DLS  63  84  60  76 /  20  10  20  20

&&

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

$$

90/93/90


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