Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 310538
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1030 PM PDT THU OCT 30 2014

.SHORT TERM...LARGE UPPER LEVEL LOW APPROACHING THE PACIFIC
NORTHWEST. COLD FRONTAL BOUNDARY LOCATED ALONG THE COAST THIS
EVENING. AHEAD OF THIS SYSTEM SATELLITE SHOWS SKIES ARE CLOUDY
ACROSS WASHINGTON AND OREGON. RAIN HAS BEEN FOCUSED MOSTLY ALONG THE
CASCADES AND EAST SLOPES THIS EVENING AND WILL CONTINUE OVERNIGHT.
SOME OF THIS MAY BE HEAVY AT TIMES ESPECIALLY OVER THE WASHINGTON
CASCADES. THE UPPER LOW WILL SLOWLY PUSH THE COLD FRONT THROUGH THE
REGION ON FRIDAY. RAIN WILL SPREAD EAST WITH THE FRONT. A SURFACE
LOW WILL DEVELOP ON THE BOUNDARY FRIDAY NIGHT AND MOVE ACROSS IDAHO
INTO MONTANA ON SATURDAY. A LARGE PRECIP SHIELD WILL DEVELOP AND
KEEP RAIN FALLING OVER NORTHEAST OREGON AND SOUTHEAST WASHINGTON
INTO SATURDAY. COLDER AIR MOVING IN BEHIND THE FRONT WILL MEAN SNOW
FOR THE HIGHER MOUNTAINS ESPECIALLY THE WALLOWA AND BLUES. CLOUD
COVER AND A COLDER AIRMASS WILL KEEP TEMPERATURES CLOSER TO NORMAL
THE NEXT FEW DAYS WITH HIGHS MOSTLY IN THE 40S AND 50S. HAVE ADDED
PATCHY FOG TO THE FORECAST FOR TONIGHT AND FRIDAY MORNING FOR THE
COLUMBIA BASIN AND ADJACENT VALLEYS. LOW LEVEL INVERSION AND HIGH
DEW POINTS INDICATE FOG COVERAGE WILL INCREASE. 94

.AVIATION...06Z TAFS. FRONTAL BOUNDARY WITH STEADY RAIN OVER CENTRAL
OREGON/WASHINGTON WILL MOVE SLOWLY EAST TONIGHT INTO FRIDAY. LOW
CEILINGS AND FOG WILL CREATE MVFR/IFR CONDITIONS AT MOST TAF SITES
OVERNIGHT INTO FRIDAY. WINDS MAINLY 5-15KT.

&&

.PREV DISC... /ISSUED 225 PM PDT THU OCT 30 2014/

SHORT TERM...TONIGHT THROUGH SATURDAY NIGHT. A WARM FRONT MOVED
ACROSS AND NORTH OF THE AREA THIS MORNING TAKING MUCH OF THE RAIN
WITH IT EXCEPT ALONG THE WA CASCADES. THE SHOWERS WILL PERSIST
ACROSS THIS REGION UNTIL A COLD FRONT APPROACHES THE TWO STATE AREA
TOMORROW. THE FRONT IS FORECAST TO MOVE FROM WEST TO EAST ACROSS THE
AREA FRIDAY. SHOWERS WILL ACCOMPANY THE FRONT AS IT TRACKS ACROSS
OUR WESTERN ZONES FRIDAY MORNING BEFORE ARRIVING ALONG THE FOOTHILLS
OF THE BLUE MOUNTAINS FRIDAY AFTERNOON. SHOWERS ARE FORECAST TO
SPREAD INTO THE BLUE/WALLOWAS FRIDAY NIGHT AND REMAIN ACROSS THIS
AREA INTO SATURDAY. AS THE SHOWERS DRIFT AWAY FROM THE REGION SOME
DRIER AIR WILL MOVE INTO OUR ENTIRE AREA SATURDAY NIGHT.

BREEZY WEST WINDS ARE POSSIBLE FRIDAY WITH THE PASSAGE OF THE FRONT.
MEANWHILE AFTERNOON TEMPERATURES WILL RETURN TO NEAR NORMAL THIS
WEEKEND.

LONG TERM...SUNDAY THROUGH THURSDAY NIGHT...DRY CONDITIONS KICK IN
DURING THE DAYLIGHT HOURS ON SUNDAY AS HIGH PRESSURE BUILDS OVER
REGION IN THE WAKE OF A MID/UPPER LEVEL TROUGH WHICH WILL HAVE MOVED
INTO IDAHO/MONTANA BY DAYBREAK ON SUNDAY. DRY CONDITIONS REMAIN OVER
REGION SUNDAY NIGHT WHILE A WARM FRONT APPROACHES THE COAST MAKING
LANDFALL OVERNIGHT MONDAY. THE WARM FRONT BEGINS SPREADING RAIN EAST
OF THE CASCADES MONDAY MORNING WITH RAIN MAKING AN ENTRANCE IN
CENTRAL OREGON AND SOUTH CENTRAL WASHINGTON BY LATE AFTERNOON.
MONDAY NIGHT THE WARM FRONT SWEEPS ACROSS FORECAST AREA BRINGING
RAIN LIKELY AREAWIDE. THE WARM FRONT PERSISTS OVER REGION DURING
DAYLIGHT HOURS ON MONDAY, WHICH KEEPS HIGH POPS OVER MOUNTAINS AND
FOOTHILLS OF THE BLUE MOUNTAINS THROUGH MONDAY AFTERNOON. THE WARM
AIR BRINGS ADDITIONAL RAIN TO MOUNTAINS MONDAY NIGHT WITH A COLD
FRONT SWEEPING ACROSS FORECAST ON TUESDAY FOR MORE RAIN. WEDNESDAY
AND THURSDAY HIGH PRESSURE BUILDS OVER CWA FOR MAINLY DRY
CONDITIONS. POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  48  58  40  51 /  10  70  70  20
ALW  50  60  44  53 /  10  70  70  30
PSC  48  60  42  56 /  10  60  60  10
YKM  46  57  36  55 /  70  70  20  10
HRI  46  59  40  56 /  10  60  60  10
ELN  45  54  36  51 /  80  70  20  10
RDM  43  53  31  48 /  40  80  50  10
LGD  46  60  41  46 /  10  50  70  70
GCD  44  58  38  47 /  10  60  70  60
DLS  50  58  42  55 /  80  80  20  10

&&

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

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

$$

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