Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 220550
AFDPDT

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

.SHORT TERM...NORTHWEST FLOW ALOFT CONTINUES TO PUSH CLOUDS ACROSS
THE FORECAST AREA THIS EVENING WITH LIGHT RAIN OVER THE CASCADES AND
NORTHEAST OREGON MOUNTAINS. EXPECT THIS TO CONTINUE OVERNIGHT. UPPER
RIDGE BUILDS IN MONDAY WITH CLEARING SKIES. THE RIDGE REMAINS IN
PLACE THROUGH TUESDAY WITH FAIR WEATHER. TEMPERATURES WILL BE ABOVE
NORMAL WITH HIGHS IN THE 40S. A SURFACE LOW AND FRONTAL BOUNDARY
WILL MOVE ACROSS THE AREA WEDNESDAY WITH RAIN. COLDER AIR MOVES IN
WEDNESDAY NIGHT. 94

.AVIATION...06Z TAFS. BKN-OVC 040-090 TONIGHT INTO MONDAY MORNING.
WINDS 5-15KT. IMPROVING CONDITIONS LATE MORNING INTO THE AFTERNOON.

&&

.PREV DISC... /ISSUED 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

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  39  47  34  49 /  20  10  10  20
ALW  41  47  35  48 /  20  10  10  20
PSC  38  48  32  46 /  10   0  10  20
YKM  35  44  32  43 /  10  10  10  20
HRI  39  50  34  48 /  10  10  10  20
ELN  34  42  31  42 /  10  10  10  20
RDM  37  47  32  51 /  60  20  20  10
LGD  37  44  30  44 /  50  20  10  20
GCD  39  44  35  46 /  70  30  20  20
DLS  41  50  38  49 /  40  10  20  20

&&

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

WA...NONE.
&&

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

$$

94






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