Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 212052
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
152 PM PDT THU AUG 21 2014

.SHORT TERM...TONIGHT THROUGH SUNDAY...THE PROGRESSION OF THE
OVERALL TROUGH PATTERN OVER THE REGION TRANSITIONING TO A CLOSED LOW
CONTINUES. CURRENTLY THE SHORTWAVE DROPPING INTO THE TROUGH WHICH
WILL RESULT IN THE CLOSING OFF OF THE LOW PRESSURE IS OVER VANCOUVER
ISLAND. IT IS INSTIGATING SOME CONVECTION OVER NORTHERN WASHINGTON
AND DOWN THE EAST SLOPES OF THE CASCADES INTO KITTITAS COUNTY. THIS
WILL LEAD TO SOME POSSIBLE SHOWERS OVER THE CENTRAL WASHINGTON
CASCADES LATE THIS AFTERNOON AND CONTINUING OVERNIGHT AS THE LOW
PRESSURE SETTLES OVER THAT AREA. ALSO STARTING TO SEE SOME SHALLOW
CONVECTION TAKING PLACE OVER NORTHERN BLUE MOUNTAINS AND WALLOWA
COUNTY. THIS COULD ALSO LEAD TO SOME SHOWERS OVERNIGHT FOR THAT
AREA. THE BRUNT OF THE SHOWERS AND POTENTIAL THUNDERSTORMS WILL COME
ON FRIDAY WITH THE UPPER LEVEL LOW BEING CENTERED OVER THE FORECAST
AREA. EXPECT A CHANCE OF SHOWERS AND THUNDERSTORMS OVER THE
WASHINGTON CASCADES AND EASTERN MOUNTAINS WITH JUST A SLIGHT CHANCE
REST OF THE FORECAST AREA...EXCEPT CENTRAL OREGON THAT LOOKS TO
REMAIN DRY. THE LOW WILL SHIFT EASTWARD FRIDAY NIGHT WITH SHOWERS
DECREASING AND BE OVER THE NORTHERN ROCKIES ON SATURDAY AND SUNDAY.
THIS WILL LEAVE THE FORECAST AREA UNDER A COOL AND SLIGHTLY UNSTABLE
ATMOSPHERE RESULTING IN SOME LINGERING SHOWERS FOR THE WASHINGTON
CASCADES AND EASTERN MOUNTAINS OVER THE WEEKEND. TEMPERATURES WILL
REMAIN COOL AND BELOW NORMAL THROUGH THE SHORT TERM.

.LONG TERM...SUNDAY NIGHT THROUGH THURSDAY...EC AND GFS IN FAIR
AGREEMENT ON TRANSITION FROM TROUGH ON MONDAY TO RIDGE ON TUESDAY
AND BACK TO A BROAD TROUGH WITH WESTERLY FLOW ON THURSDAY.
TEMPERATURES WILL RISE TO ABOVE NORMAL BY MIDWEEK WITH THE RIDGE.  A
FEW THUNDERSTORMS OVER MAINLY THE EASTERN MOUNTAINS ARE POSSIBLE
MONDAY WITH THE DEPARTING TROUGH.


&&

.AVIATION...00Z TAFS. VFR CONDITIONS WILL PREVAIL. SCT THUNDERSTORMS
ARE POSSIBLE AFTER 18Z FOR KYKM.  WON`T MENTION IN OTHER AREAS TIL
TIMING PROJECTIONS AND CONFIDENCE INCREASE.


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  54  79  56  81 /  10  20  40  10
ALW  60  80  61  80 /  10  20  40  10
PSC  58  82  60  84 /  10  20  30  10
YKM  56  79  56  83 /  10  40  30  10
HRI  57  82  57  85 /  10  20  30  10
ELN  56  78  55  82 /  20  50  30  10
RDM  43  73  44  76 /   0  10  10   0
LGD  49  73  50  72 /  10  30  50  20
GCD  47  72  51  72 /  10  10  20  10
DLS  59  80  60  86 /  10  20  20   0

&&

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

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

91/79/79








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