Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 161750
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1050 AM PDT TUE SEP 16 2014

...UPDATED AVIATION DISCUSSION...

.SHORT TERM...TODAY THROUGH WEDNESDAY...HIGH PRESSURE CONTINUES OVER
THE REGION WITH A TROUGH OF LOW PRESSURE OFF THE COAST. THE TROUGH
WILL MOVE CLOSER TO THE COAST ON WEDNESDAY LEADING TO INCREASING
CLOUDS OVERNIGHT AND WEDNESDAY. PRECIPITATION CHANCE WILL BE LIMITED
TO THE CASCADES AND EAST SLOPES LATE WEDNESDAY AFTERNOON AND EVENING
WITH A SLIGHT CHANCE OF THUNDERSTORMS FROM MOUNT JEFFERSON SOUTHWARD
ALONG THE EAST SLOPES. TEMPERATURES TODAY AND WEDNESDAY WILL
CONTINUE TO RUN ABOVE NORMAL BY ABOUT 10 DEGREES.


&&

.AVIATION...18ZTAFS...VFR CONDITIONS TO PERSIST AT ALL TAFS SITES
THROUGH THE PERIOD. INTERESTING NOTE...THERE APPEARS TO BE A NEARLY
STATIONARY MOUNTAIN WAVE CLOUD NEAR KBND THIS MORNING...WHICH IS NOW
IN THE PROCESS OF DISSIPATING. JUST A FEW HIGH CLOUDS MOVING THROUGH
THE AREA THIS AFTERNOON AS A WEAK UPPER LEVEL RIDGE REMAINS IN
PLACE. EXPECT GENERALLY LIGHT AND TYPICAL DIURNAL WINDS...HOWEVER A
FEW GUSTS TO 15-25KT ARE POSSIBLE FOR A FEW HOURS LATE THIS
AFTERNOON AS STRONGER WINDS MIX DOWN TO THE SURFACE BRIEFLY.
OTHERWISE...THE NEXT SYSTEM TO AFFECT THE REGION BEGINS TO MOVE
ONSHORE OVERNIGHT AND INTO TOMORROW MORNING. THIS SYSTEM WILL SPREAD
MID TO HIGH LEVEL CLOUDS INTO THE AREA AFTER 0600Z WEDNESDAY. AT
THIS TIME NO PRECIPITATION IS EXPECTED THROUGH 1800Z WEDNESDAY AT
THE TAF SITES...WITH THE CLOUD DECK LIKELY REMAINING ABOVE 10K FT.



$$

.PREV DISC... /ISSUED 300 AM PDT TUE SEP 16 2014/

SHORT TERM...TODAY THROUGH THURSDAY. SATELLITE SHOWING AN UPPER
LEVEL SHORT WAVE MOVING ACROSS THE REGION EARLY THIS MORNING WITH
SOME CLOUDINESS AND A FEW SHOWERS. AFTER THIS SYSTEM MOVES THROUGH
EXPECT CLEARING SKIES. SOUTHERLY FLOW ALOFT WITH A LARGE SCALE UPPER
LOW OFFSHORE. THE AIRMASS IS WARM WITH 850MB TEMPS NEAR 21C. HIGHS
TODAY WILL BE IN THE 80S WHICH IS ABOUT 10 DEGREES ABOVE NORMAL. THE
UPPER LOW WILL BE APPROACHING THE WEST COAST ON WEDNESDAY. THIS WILL
BRING INCREASING MID AND HIGH LEVEL CLOUDS. MODELS CONTINUE TO SHOW
MOST OF THE PRECIPITATION STAYING WEST OF THE CASCADES THROUGH THE
DAY. ANOTHER DAY WITH SOUTHERLY FLOW AND A WARM AIRMASS SUPPORTING
HIGHS INTO THE 80S. THE UPPER TROUGH MOVES THROUGH THE AREA
THURSDAY. THIS WILL BRING MOSTLY CLOUDY SKIES WITH SCATTERED SHOWERS
AND COOLER TEMPERATURES.  94

LONG TERM...THURSDAY NIGHT THROUGH MONDAY...MID/UPPER LEVEL TROUGH
WHICH MOVED INLAND DURING THE DAYTIME ON THURSDAY WILL HAVE MOVED
INTO IDAHO/MONTANA THURSDAY NIGHT THUS ALLOWING A RIDGE OF HIGH
PRESSURE OFFSHORE TO BEGIN BUILDING EASTWARD OVER THE PACIFIC
NORTHWEST ON FRIDAY. THE RIDGE WILL PERSIST OVER THE REGION THROUGH
THE WEEKEND AND THROUGH MONDAY AS WELL FOR DRY AND STABLE CONDITIONS
WITH DAYTIME HIGH TEMPERATURES RUNNING 5-10 DEGREES ABOVE NORMAL.
POLAN

AVIATION...12Z TAFS...VFR CONDITIONS WILL PREVAIL FOR THE NEXT 24
HOURS. THERE WILL BE A LOT OF HIGH CLOUDS BETWEEN 150-250 WHICH MAY
LIMIT HEATING ON TUESDAY. WINDS WILL REMAIN LIGHT AND 15 KTS OR LESS
THROUGH TUESDAY EVENING.  POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  86  56  86  57 /  10   0   0  10
ALW  85  60  87  61 /  10   0   0  10
PSC  86  53  87  59 /  10   0   0  10
YKM  86  55  84  57 /   0   0  10  20
HRI  87  52  87  57 /  10   0   0  10
ELN  88  58  85  58 /  10   0  10  30
RDM  85  45  83  48 /   0   0  10  20
LGD  88  51  88  52 /  10  10   0  20
GCD  88  53  88  51 /  10  10  10  20
DLS  88  56  84  60 /   0  10  10  30

&&

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

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

$$

91/78/78





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