Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 281147 AAA
AFDPDT

Area Forecast Discussion...Updated
National Weather Service Pendleton OR
447 AM PDT Sun May 28 2017

Updated AVIATION Discussion

.SHORT TERM...Today through Tuesday...High pressure will continue
to dominate the areas weather with dry conditions and above normal
temps. Afternoon high temps will again approach 90 degrees in and
near the columbia basin into the beginning of next week. Meanwhile
a low pressure system will approach the two state area Monday
and isolated tsra are possible along the wa/or cascades Monday
aftn/eve. As the low pressure system nears the pacnw coast
additional moisture is forecast to move into the region and
combining this with daytime heating will make the atmosphere
increasingly unstable on Tuesday. Isold to scattered tsra are
expected to develop and expand in coverage from the or/wa
cascades into central oregon Tuesday afternoon and then into
portions of the columbia basin afterwards.

.LONG TERM...Tuesday night through Saturday...A negatively tilted
mid/upper level shortwave moves through forecast area Tuesday night
through Wednesday night for a chance of rain showers and a slight
chance of thunderstorms through Wednesday night. The disturbance
exits the region on Thursday although a slight chance of showers
will linger over the eastern mountains of Oregon through Thursday
evening with a slight chance of afternoon/evening thunderstorms over
the Blue Mountains on Thursday. Friday and Saturday westerly flow
aloft will keep dry conditions over the interior Pacific Northwest.
Polan

&&

.AVIATION...12Z TAFs...Clear skies this morning. Sct cumulus at
060-100 mostly over the mountains in the afternoon and early
evening, then clear skies after sundown through overnight. Winds
will be diurnally terrain driven at 5-10kt, upslope late morning
through afternoon, becoming downslope drainage winds in the evening
through overnight.  Polan

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  87  52  89  56 /   0   0   0   0
ALW  89  59  91  62 /   0   0   0   0
PSC  90  53  94  56 /   0   0   0   0
YKM  91  55  94  58 /   0   0   0  10
HRI  90  53  92  55 /   0   0   0   0
ELN  90  51  92  54 /   0   0  10  10
RDM  87  46  89  49 /   0   0   0  20
LGD  82  45  84  48 /   0   0   0   0
GCD  87  49  90  52 /   0   0   0  10
DLS  93  58  94  61 /   0   0   0  20

&&

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

$$

97/99/99



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