Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 191205 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
505 AM PDT SUN APR 19 2015

UPDATED AVIATION DISCUSSION

.SHORT TERM...TODAY THROUGH TUESDAY NIGHT...AN UPPER LEVEL RIDGE
WILL REMAIN OVER WASHINGTON AND OREGON TODAY THROUGH TUESDAY
MORNING. THIS WILL KEEP FAIR WEATHER WITH LIGHT WINDS AND WARM DAYS
OVER EASTERN WASHINGTON AND OREGON. RADIATIONAL COOLING AT NIGHT
WILL KEEP MORNINGS COOL, BUT SHORTER NIGHTS WILL LIMIT COOLING.
TUESDAY AN ELONGATED TROUGH WILL APPROACH THE COAST. IN THE
AFTERNOON INCREASING MOISTURE AND INSTABILITY IN THE SOUTHERLY FLOW
AHEAD OF THE TROUGH MAY TRIGGER A FEW THUNDERSTORMS...MAINLY IN
OREGON AND ALONG THE CASCADES. THE BEST INSTABILITY AND MOISTURE
WILL BE IN CENTRAL OREGON...BUT THUNDERSTORMS ARE POSSIBLE FROM
CENTRAL TO NORTHEAST OREGON AND ALONG THE CASCADES.  COONFIELD

.LONG TERM...WEDNESDAY THROUGH SATURDAY...MID TO LATTER PART OF NEXT
WEEK MODELS SHOW MINOR DIFFERENCES IN TERMS OF UPPER LEVEL TROUGH
POSITION ALONG THE COAST. OVERALL PATTERN IS PROGRESSIVE WITH AN
UPPER LEVEL JET STREAM FORGING EASTWARD ALONG 40N FRIDAY WITH THE
NOSE OF THE JET REACHING 145W BY FRIDAY AFTERNOON. THE JET DEVELOPS
INTO A LARGE UPPER LEVEL TROUGH BETWEEN 40-50N  AND 135-155W ON
SATURDAY. THIS LONG WAVE TROUGH THEN MOVES SLOWLY EAST ON SUNDAY AND
BRING PRECIPITATION TO THE COAST SATURDAY NIGHT WITH SHOWERS
SPREADING EAST OF THE CASCADES ON SUNDAY. SNOW LEVELS START OUT
ABOVE 7000 FEET AND GRADUALLY LOWER TO 4-5K FEET BY NEXT WEEKEND.
POLAN


&&

.AVIATION...12Z TAFS...VFR CONDITIONS WITH SCATTERED THIN HIGH
CLOUDS THIS MORNING, THEN MOSTLY CLEAR SKIES TONIGHT. DRAINAGE WINDS
WILL CONTINUE UNTIL AROUND 16Z FOLLOWED BY LIGHT AND VARIABLE WINDS
UNTIL AROUND 19Z. WINDS WILL THEN BECOME MAINLY NORTHERLY AT 5-10 KT
THIS AFTERNOON. WITHIN AN HOURS OR TWO OF SUNSET WINDS WILL BECOME
DRAINAGE AT 5-8 KTS THROUGH TONIGHT.  POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  76  41  78  44 /   0   0   0   0
ALW  74  47  76  50 /   0   0   0   0
PSC  78  41  80  43 /   0   0   0   0
YKM  75  41  77  44 /   0   0   0   0
HRI  78  39  79  41 /   0   0   0   0
ELN  76  39  78  45 /   0   0   0   0
RDM  77  31  77  33 /   0   0   0   0
LGD  70  37  71  39 /   0   0   0   0
GCD  72  37  72  37 /   0   0   0   0
DLS  81  42  82  47 /   0   0   0   0

&&

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

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

$$

76/99/99






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