Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 301000
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
300 AM PDT SUN AUG 30 2015

.SHORT TERM...TODAY THROUGH TUESDAY...POTENT UPPER LEVEL TROUGH WILL
MOVE ACROSS THE FORECAST AREA TODAY. BAROCLINIC BAND OF RAIN/SHOWERS
WILL SPREAD ACROSS THE FORECAST AREA THIS MORNING BRINGING A GENERAL
LIGHT RAINFALL. THIS WILL BE FOLLOWED BY THE UPPER VORT MAX AND
ASSOCIATED SHOWERS AND POSSIBLE THUNDERSTORMS. HAVE INCLUDED A
SLIGHT CHANCE OF THUNDERSTORMS FROM 18Z TO 00Z TODAY FOR THE BLUE
MOUNTAIN FOOTHILLS EASTWARD TO THE IDAHO BORDER. INSTABILITY WILL BE
MARGINAL BUT THE FORCING WILL BE QUITE STRONG. CONDITIONS QUICKLY
IMPROVE THIS EVENING WITH PRECIPITATION ENDING EXCEPT NEAR THE
WASHINGTON CASCADE CREST. FOR MONDAY THROUGH TUESDAY EXPECT
GENERALLY FAIR CONDITIONS AND COOL TEMPERATURES. THERE WILL BE A
CHANCE OF SHOWERS ALONG THE WASHINGTON CASCADE CREST...ELSEWHERE
JUST A FEW FEW CLOUDS. HIGHS IN THE LOWER ELEVATIONS WILL BE IN THE
MID 70S TO LOWER 80S WITH 60S TO LOWER 70S MOUNTAINS. LOWS WILL BE
IN THE UPPER 40S TO MID 50S LOWLANDS WITH 30S TO LOWER 40S
MOUNTAINS. 78

.LONG TERM...TUESDAY NIGHT THROUGH SUNDAY..AN UPPER LEVEL TROUGH
WILL REMAIN OVER BRITISH COLUMBIA AND THE PACIFIC NORTHWEST FOR MOST
OF THE LONG TERM PERIOD AND GIVE US CONTINUED UNSETTLED WEATHER.
TUESDAY NIGHT AN UPPER LOW WILL BE MOVING THROUGH THE TROUGH AND
WILL DRAG A FRONT THROUGH THE AREA. IN THE EVENING A CHANCE OF RAIN
SHOWERS WILL BE CONFINED TO THE CASCADES BUT OVERNIGHT AND THURSDAY
A SLIGHT CHANCE OF RAIN SHOWERS WILL EXPAND ACROSS THE AREA EXCEPT
FOR THE WASHINGTON COLUMBIA BASIN WHICH WILL REMAIN PRIMARILY DRY.
ON THURSDAY, ANOTHER WAVE WILL MOVE THROUGH THE TROUGH WITH A SLIGHT
CHANCE OF SHOWERS IN AND NEAR THE CASCADES, THE BLUE MOUNTAIN
FOOTHILLS AND THE EASTERN MOUNTAINS. MODELS HINT AT SOME INSTABILITY
SO HAVE ADDED A SLIGHT CHANCE OF THUNDERSTORMS ALONG THE HIGHER
TERRAIN FROM THE OCHOCO-JOHN HIGHLANDS TO WALLOWA COUNTY. BY FRIDAY
THE TROUGH SHIFTS A LITTLE NORTH  AND ON SATURDAY A LITTLE TO THE
EAST AND A SLIGHT CHANCE OF SHOWERS WILL BE CONFINED TO THE
WASHINGTON CASCADES, THE NORTHERN BLUE MOUNTAINS AND WALLOWA COUNTY
EACH DAY. ON SUNDAY MODELS SHOW THE TROUGH FINALLY MOVING TO THE
ROCKIES AND OUT OF OUR AREA. THERE WILL BE SOME WEAK TRANSITORY
RIDGING AHEAD OF AN UPPER LOW DROPPING SOUTH FROM THE GULF OF
ALASKA. THIS WILL GIVE THE AREA FAIR WEATHER ON SUNDAY. WEDNESDAY
AND THURSDAY WILL HAVE TEMPERATURES IN THE LOWER TO MID 70S WITH
MAINLY 60S IN THE MOUNTAINS. FRIDAY THROUGH SUNDAY WILL SEE A
GRADUAL WARMING TREND WITH HIGHS IN THE UPPER 70S TO THE MID 80S
WITH MID 70S TO LOWER 80S IN THE MOUNTAINS BY SUNDAY. PERRY

&&

.AVIATION...PREVIOUS DISCUSSION...06Z TAFS...VFR CONDITIONS WILL
PERSIST AT ALL TAF SITES UNTIL 08Z WHEN A STORM SYSTEM ENTERS THE
PACIFIC NORTHWEST AND SPREADS CLOUDS AND SHOWERS CREATING AREAS OF
MVFR CONDITIONS AT ALL TAF SITES BEGINNING WITH KDLS AND KYKM.
AROUND 10Z AREAS OF MVFR CONDITIONS SHOULD BEGIN AROUND TAF SITES
KPSC...KPDT...KALW...KRDM...AND KBDN ESPECIALLY IN RAIN SHOWERS.
AFTER 02Z THE CONDITIONS SHOULD SLOWLY IMPROVE TOWARD VFR CONDITIONS
FROM WEST TO EAST.


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  71  52  77  54 /  70  10  10   0
ALW  73  56  78  59 /  70  10  10   0
PSC  76  56  81  55 /  70  10  10   0
YKM  72  48  73  47 /  40  10  10  10
HRI  76  53  80  55 /  70  10  10   0
ELN  68  50  74  50 /  50  10  20  20
RDM  65  40  77  42 /  60  10  10   0
LGD  66  46  78  47 /  60  10  10   0
GCD  67  37  81  39 /  50  10  10   0
DLS  73  56  80  60 /  70  10  10  10

&&

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

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

$$

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