Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 041635
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
934 AM PDT FRI SEP 4 2015

.SHORT TERM...MORNING UPDATE...AN UPPER TROUGH WILL BE OVER THE
WESTERN U.S. THROUGH TONIGHT. AN UPPER LOW CENTER WILL CONCENTRATE
ITSELF OVER WESTERN OREGON THIS AFTERNOON. THIS LOW CENTER WILL THEN
SWING INTO NORTHEAST OREGON OVERNIGHT TONIGHT. CENTRAL AND NORTHEAST
OREGON, AND SOUTHEAST WASHINGTON WILL REMAIN ON THE SOUTHERLY FLOW
SIDE OF THIS LOW TODAY. AS SUCH WILL SEE INCREASING CHANCES OF
SHOWERS ACROSS DESCHUTES, JEFFERSON, CROOK, WHEELER AND GRANT
COUNTIES IN OREGON THROUGH TODAY. SHOWERS WILL ALSO BE POSSIBLE,
MAINLY THIS AFTERNOON INTO THE EVENING, ALONG THE WASHINGTON CASCADE
EAST SLOPES, THE NORTHERN BLUE MOUNTAINS, GRANDE RONDE VALLEY AND
WALLOWA COUNTY. SHOWERS WILL WORK INTO THE BLUE MOUNTAIN FOOTHILLS
AND THE LOWER COLUMBIA BASIN TONIGHT. THERE WILL BE JUST ENOUGH
INSTABILITY TODAY INTO THIS EVENING FOR A FEW STRAY THUNDERSTORMS
OVER THE CASCADE EAST SLOPES, CENTRAL OREGON, OCHOCO-JOHN DAY
HIGHLANDS, JOHN DAY BASIN, SOUTHERN BLUE MOUNTAINS AND WALLOWA
COUNTY. UPDATES THIS MORNING FOCUSED ON ADJUSTMENTS TO SHOWER AND
THUNDERSTORM LOCATIONS AND COVERAGES. 90

.LONG TERM...PREVIOUS DISCUSSION...MODELS ARE INDICATING A FAST
MOVING MID/UPPER LEVEL SHORT WAVE MOVING ACROSS FORECAST AREA SUNDAY
NIGHT. THIS SYSTEM WILL BRING VARIABLE MID AND HIGH CLOUDS  AND WILL
BE DRY, EXCEPT FOR A SLIGHT CHANCE OF SHOWERS SUNDAY NIGHT IN THE
NORTHERN BLUE MOUNTAINS AND IN THE NORTH FACING SLOPES OF THE
WALLOWA MOUNTAINS. MONDAY THROUGH TUESDAY A MID/UPPER LEVEL RIDGE OF
HIGH PRESSURE MOVES ACROSS REGION WITH ASSOCIATED SINKING AIR
CAUSING DRY CONDITIONS FROM DAYBREAK MONDAY THROUGH SUNSET TUESDAY.
THEN AN UPSTREAM FLAT RIDGE OF HIGH PRESSURE OVER THE NORTHEAST
PACIFIC MOVES INLAND OVER THE PACIFIC NORTHWEST THUS YIELDING DRY
CONDITIONS THROUGH THURSDAY.

&&

.AVIATION...PREVIOUS DISCUSSION...12Z TAFS...VFR CONDITIONS WILL
PREVAIL THROUGH THE PERIOD. SKIES WILL START OUT MOSTLY CLEAR THIS
MORNING, BUT EXPECT INCREASING MID LEVEL CLOUDS AS A STORM SYSTEM
APPROACHES THE AREA. BY LATE MORNING EXPECT CIGS AT 4-6 THOUSAND
FEET AT KBDN AND KRDM WITH VCSH. KPDT AND KDLS WILL SEE VCSH AFTER
05/00Z. SOUTHEAST WASHINGTON TAF SITES KALW, KPSC AND KYKM SHOULD
NOT SEE PRECIPITATION UNTIL AFTER 05/06Z FRIDAY NIGHT. WINDS TODAY
WILL BE MOSTLY NORTHERLY 5 TO 15 KTS.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  68  50  63  48 /  10  60  60  20
ALW  72  53  63  54 /  10  60  60  30
PSC  75  54  69  52 /  10  40  50  20
YKM  69  50  69  48 /  10  10  10  10
HRI  73  54  69  52 /  10  50  50  20
ELN  70  48  66  49 /  20  20  10  10
RDM  60  40  60  36 /  50  60  30  10
LGD  66  43  56  41 /  20  60  70  40
GCD  65  40  58  37 /  60  70  70  30
DLS  73  53  70  54 /  20  20  10  10

&&

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

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

$$

90/99/76


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