Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 191628
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
928 AM PDT SUN APR 19 2015

.SHORT TERM...MORNING UPDATE...UPPER LEVEL HIGH PRESSURE ALONG THE
WEST COAST WILL CONTINUE TO INFLUENCE THE WEATHER ACROSS THE AREA
THROUGH TONIGHT. THE FLOW ALOFT WILL CONTINUE TO BE NORTHWEST TO
NORTH. AN AREA OF SMOKE ALOFT (ORIGINATED IN SIBERIA) WITHIN THIS
FLOW WILL CONTINUE TO DRIFT SOUTH THROUGH THE DAY. AS SUCH HAZY
SUNSHINE THIS MORNING WILL INCREASE IN CLARITY THIS AFTERNOON. WILL
ALSO SEE SOME THIN HIGH CLOUDINESS AT TIMES. LIGHT WINDS THIS
MORNING WILL BECOME 5 TO 15 MPH FROM THE NORTH THROUGH EAST THIS
AFTERNOON. HIGH TEMPS WILL REMAIN ABOVE SEASONAL. UPDATES THIS
MORNING INCLUDED ADJUSTMENTS TO WINDS, SKY COVER AND HIGH TEMPS. 90

.LONG TERM...PREVIOUS DISCUSSION...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.

&&

.AVIATION...18Z TAFS...VFR CONDITIONS WITH LIGHT WINDS WILL PREVAIL
OVER THE NEXT 24 HOURS. THE HIGH LEVEL SMOKE OVER THE REGION THIS
MORNING WILL CLEAR BY LATE AFTERNOON...WITH ANOTHER ROUND EXPECTED
BY MONDAY MORNING. 93

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  72  41  78  44 /   0   0   0   0
ALW  73  47  76  50 /   0   0   0   0
PSC  76  41  80  43 /   0   0   0   0
YKM  75  41  77  44 /   0   0   0   0
HRI  77  39  79  41 /   0   0   0   0
ELN  75  39  78  45 /   0   0   0   0
RDM  75  31  77  33 /   0   0   0   0
LGD  69  37  71  39 /   0   0   0   0
GCD  73  37  72  37 /   0   0   0   0
DLS  80  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

$$

90/99/93







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