Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 212143
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
143 PM PST SUN DEC 21 2014

.SHORT TERM...TONIGHT THROUGH TUESDAY NIGHT...ONSHORE FLOW WILL
CONTINUE TO BRING RAIN TO THE REGION THROUGH MONDAY MORNING.
MODERATE RAIN WILL BE POSSIBLE OVER CENTRAL OREGON WHILE THE
COLUMBIA BASIN SHOULD STAY DRY...AND THE WASHINGTON CASCADES AND THE
NORTHERN BLUES WILL ONLY SEE LIGHT SHOWERS. BREEZY WINDS WILL ALSO
CONTINUE TO DIMINISH OVERNIGHT. TEMPERATURES WILL REMAIN ABOVE
NORMAL THROUGH TONIGHT AND TOMORROW AS HIGH PRESSURE BUILDS ALONG
THE WEST COAST. ON MONDAY AFTERNOON AND EVENING...THE PERSISTENT
ONSHORE FLOW COULD CONTINUE TO BRING SOME LIGHT RAIN TO CENTRAL
OREGON...BUT MOST OF THE REMAINDER OF THE LOCAL AREA WILL BE DRY.
FOG IS THEN EXPECTED TO DEVELOP IN THE VALLEYS IN AND AROUND THE
COLUMBIA BASIN ON MONDAY NIGHT. A WEAK WEATHER DISTURBANCE WILL MOVE
THROUGH THE REGION TUESDAY AND TUESDAY NIGHT WITH THE BEST
PRECIPITATION CHANCES ALONG THE EAST SLOPES OF THE WASHINGTON
CASCADES. SNOW LEVELS WILL REMAIN HIGH DURING THIS PERIOD AT 6000 TO
8000 FEET ON TUESDAY.  COBB

.LONG TERM...WEDNESDAY THROUGH SUNDAY.  A UPPER LEVEL LOWER PRESSURE
SYSTEM WILL BE MOVING SOUTHEAST ACROSS THE PACIFIC NORTHWEST
WEDNESDAY AND WEDNESDAY NIGHT WITH GENERALLY RAIN AND MOUNTAIN
SNOW.  THE NEWEST RUN OF THE MODELS DONT BRING THE COLDER AIR INTO
THE AREA UNTIL EARLY THURSDAY MORNING WHEN THE SYSTEM IS EXPECTED TO
BE EXITING THE AREA WITH ONLY SOME LINGER SNOW SHOWERS FOR THE
MOUNTAINS. THE AREA REMAINS IN NORTHWEST FLOW THROUGH SATURDAY WITH
MAINLY DRY CONDITIONS AND SEASONAL TEMPERATURES  ANOTHER UPPER LEVEL
LOW PRESSURE SYSTEM WILL BE DROPPING THROUGH THE NORTHWEST FLOW BY
LATE IN THE WEEKEND WITH SOME COOLER AIR AND A CHANCE SNOW.  93

&&

.AVIATION...00Z TAFS. VFR CONDITIONS WILL PREVAIL FOR THE NEXT 24
HOURS.  NORTH WEST FLOW IS INCREASING ACROSS THE REGION WITH SOME
LIGHT RAIN SHOWERS ALONG AND JUST EAST OF THE MOUNTAINS.  WINDS WILL
CONTINUE TO DECREASE THROUGH THE EVENING HOURS.  THERE MAY BE SOME
PATCHY FOG WITH VSBY 4SM DURING THE EARLY MORNING HOURS AT KDLS AND
KYKM AS MODELS INDICATE LOW LEVEL MOISTURE.  93

&&

.HYDROLOGY...FLOOD WATCH HAS REMAINS FOR THE EAST SLOPES OF THE
OREGON CASCADES AS THIS AREA WILL CONTINUE TO SEE SOME RAIN THROUGH
THE EVENING. SMALL STREAMS AS STARTING TO CREST FROM MADRAS NORTH
BUT WILL TAKE A LITTLE LONGER FOR ONES SOUTH OF MADRAS.  93

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  39  45  34  48 /  30  10  10  20
ALW  41  46  35  47 /  30  10  10  20
PSC  38  47  32  45 /  10   0  10  20
YKM  35  43  32  42 /  10   0  10  20
HRI  39  50  34  47 /  20  10  10  20
ELN  34  42  31  41 /  10   0  10  20
RDM  37  45  32  50 /  60  20  20  10
LGD  37  44  30  43 /  50  20  10  20
GCD  39  45  35  45 /  70  30  20  20
DLS  41  49  38  48 /  40  10  20  20

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...FLOOD WATCH THROUGH LATE TONIGHT ORZ509.

WA...NONE.
&&

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

$$

82/93/93







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