Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 042137
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
237 PM PDT FRI SEP 4 2015

.SHORT TERM...TONIGHT THROUGH SUNDAY NIGHT...AN UPPER LOW OVER
WESTERN OREGON, WITHIN A LARGER UPPER TROUGH COVERING THE WESTERN
U.S., IS STILL EXPECTED TO SWING TO NORTHEAST OREGON OVERNIGHT.
SCATTERED SHOWERS WITH A FEW STRAY THUNDERSTORMS, SOME PRODUCING
SMALL HAIL, WILL CONTINUE ALONG THE CASCADE EAST SLOPES INTO CENTRAL
OREGON INTO THE EVENING. MEANWHILE SHOWER COVERAGE OVER EAST-CENTRAL
OREGON INTO THE BLUE AND WALLOWA MOUNTAINS WILL CONTINUE TO INCREASE
THIS EVENING. STRAY THUNDERSTORMS MAY ALSO OCCUR IN THESE AREAS
TONIGHT. WITH THE UPPER LOW OVER NORTHEAST OREGON LATE TONIGHT INTO
SATURDAY MORNING, CAN EXPECT HIGH CHANCES OF RAIN, WITH SNOW MAINLY
ABOVE 6000 FT MSL, OVER THE EASTERN HALF OF OUR AREA. ISSUED A FLOOD
WATCH EARLIER, MAINLY FOR SOUTHERN GRANT COUNTY, DUE TO THE
POTENTIAL OF MODERATE RAIN OVER RECENT BURN SCARS (ESPECIALLY SOUTH
OF JOHN DAY). THIS WATCH WILL RUN INTO EARLY SATURDAY EVENING. THE
UPPER LOW WILL KICK NORTHEAST INTO NORTHWEST MONTANA AND SOUTHERN
ALBERTA LATE SATURDAY AND SATURDAY NIGHT. THUS PRECIP OVER OUR
EASTERN ZONES WILL GRADUALLY END FROM WEST TO EAST LATE SATURDAY
AFTERNOON AND SATURDAY NIGHT. A NORTHWEST UPPER LEVEL FLOW WILL THEN
PERSIST OVER THE REGION SUNDAY AND SUNDAY NIGHT. CAN EXPECT MOSTLY
DRY AND WARMER CONDITIONS SUNDAY, THOUGH A FEW SHOWERS WILL BE
POSSIBLE OVER THE WASHINGTON CASCADE EAST SLOPES DUE TO SLOP OVER
FROM WESTERN WASHINGTON. 90

.LONG TERM....MONDAY THROUGH FRIDAY...DRY NORTHWESTERLY FLOW WILL BE
OVER WASHINGTON AND EASTERN OREGON MONDAY. A SHORT WAVE WILL PASS
THROUGH NORTHERN WASHINGTON TUESDAY...BUT THE MAIN LIFT WILL REMAIN
IN CANADA SO NO PRECIPITATION IS EXPECTED IN THE CWA. WEDNESDAY
THROUGH FRIDAY A DRY RIDGE WILL MOVE OVER WASHINGTON AND OREGON. A
SERIES OF WEAK WAVES WILL MOVE THROUGH THE RIDGE BUT THE MAIN LIFT
WILL REMAIN NORTH OF THE CWA IN NORTHEAST WASHINGTON AND SOUTHERN
CANADA SO THE MAIN EFFECT WILL BE FLATTENING/WEAKENING THE RIDGE.
TEMPERATURES WILL START BELOW NORMAL...60S MOUNTAINS AND 70S
ELSEWHERE MONDAY...WARMER TUESDAY...THEN NEAR TO ABOVE NORMAL...
UPPER 70S MOUNTAINS AND MID 80S ELSEWHERE...WEDNESDAY THROUGH FRIDAY
AS THE SUBSIDENCE FROM THE RIDGE DOMINATES THE WEATHER. COONFIELD

&&

.AVIATION...00Z TAFS...VFR CONDITIONS WILL PREVAIL THROUGH 6Z.
CLOUDS WILL INCREASE THIS EVENING AS A STORM SYSTEM APPROACHES THE
AREA. PRECIPITATION WILL INCREASE ACROSS THE AREA TONIGHT. BRIEF
MVFR CIGS AND MVFR VISIBILITY POSSIBLE NEAR KRDM AND KBDN BY 8Z.
SHOWERS CHANGING TO RAIN OVERNIGHT WILL DEVELOP THIS EVENING NEAR
KPDT AND KALW WITH MVFR VISIBILITY POSSIBLE BY 9Z. KPSC AND KYKM
WILL REMAIN VFR BUT CIGS WILL LOWER TO 7-10 KFT. 76

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  49  65  45  72 /  80  80  20  10
ALW  52  63  50  73 /  80  80  30  10
PSC  53  71  47  76 /  60  80  20  10
YKM  46  72  43  72 /  10  10  10  20
HRI  53  72  46  76 /  60  80  20  10
ELN  47  70  47  71 /  20  10  10  20
RDM  39  65  32  71 /  60  10   0   0
LGD  44  58  38  69 /  80  80  40  10
GCD  41  62  36  71 /  80  70  20   0
DLS  51  72  52  74 /  20  10   0  10

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...FLASH FLOOD WATCH THROUGH SATURDAY EVENING FOR ORZ505-506.

WA...NONE.
&&

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

$$

90/76/76


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