Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 051026
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
325 AM PDT SAT SEP 5 2015

.SHORT TERM...THROUGH MONDAY...UPPER LOW OVER EAST CENTRAL OREGON
MOVING NORTHEAST.  THIS WILL CONTINUE TO BRING MODERATE RAIN TO AN
AREA EAST OF A LINE FROM PROSSER WA TO JOHN DAY ORE THIS MORNING
GRADUALLY MOVING EAST.  THE RAIN SHOULD END OVER WALLOWA COUNTY
AROUND 9 PM.  TOTAL PRECIPITATION AMOUNTS OF 1/2 TO 1 INCH ARE
LIKELY IN THE FROM THE JOHN DAY AREA TO SKI BLUEWOOD AND THE WALLOWA
MOUNTAINS. WILL KEEP THE FLASH FLOOD WATCH IN EFFECT FOR THE BURN
SCAR AREA SOUTHEAST OF JOHN DAY SINCE RAIN WILL CONTINUE THERE UNTIL
AT LEAST MID MORNING. SNOWFALL OF AN INCH OR LESS AROUND 6K FT TO 2-
3 INCHES ABOVE 7K IN THE STRAWBERRY MTNS AND WALLOWAS MAINLY THIS
MORNING.

DRIER WEATHER WILL RETURN TO NEARLY ALL AREAS SUNDAY. A SHORTWAVE
TROUGH IN A MOIST WESTERLY FLOW WILL BRING A FEW SHOWERS TO NEAR AND
JUST EAST OF THE CASCADE CREST...NORTH OF HIGHWAY 12.  TEMPERATURES
WILL CONTINUE BELOW NORMAL TODAY ESPECIALLY IN THE EAST WHERE CLOUDS
AND PRECIPITATION WILL PREVENT MUCH WARMING UNTIL THIS AFTERNOON.  A
WARMING TREND WILL RETURN FOR SUNDAY AND MONDAY.  AS THE LOW
PRESSURE SYSTEM EXITS LATER TODAY...BRING WEST WINDS WILL DEVELOP
OVER THE KITTITAS VALLEY AND EAST COLUMBIA RIVER GORGE.

.LONG TERM...MONDAY NIGHT THROUGH FRIDAY...THE EXTENDED PERIOD WILL
BE DOMINATED BY PROGRESSIVE WESTERLY FLOW ALOFT. MONDAY NIGHT AND
TUESDAY A MID/UPPER LEVEL RIDGE OF HIGH PRESSURE MOVES ACROSS THE
REGION WITH ASSOCIATED SINKING AIR CAUSING DRY CONDITIONS THROUGH
TUESDAY AFTERNOON. THEN AN UPSTREAM FLAT RIDGE OF HIGH PRESSURE OVER
THE NORTHEAST PACIFIC TUESDAY NIGHT AMPLIFIES BETWEEN THE COAST AND
140W WITH WESTERLY FLOW ALOFT TUESDAY NIGHT OVER THE INTERIOR
PACIFIC NORTHWEST VEERING TO NORTHWEST FLOW ALOFT BY FRIDAY THUS
YIELDING DOWNSLOPE WINDS EAST OF THE CASCADES FOR DRY CONDITIONS
TUESDAY NIGHT THROUGH FRIDAY.  POLAN

&&

.AVIATION...12Z TAFS...A LARGE UPPER LEVEL LOW PRESSURE SYSTEM
CONTINUES TO SLOWLY WORK THROUGH THE AREA TODAY AND TONIGHT. THIS
WILL KEEP LOW AND MID LEVEL CLOUDS ALONG WITH PERIODS OF RAIN FOR
PARTS OF THE FORECAST AREA. VFR CONDITIONS WILL PREVAIL AT KBDN,
RDM, KDLS AND KYKM AS MOST OF THE SHOWERS/RAIN WILL OCCUR EAST OF
THESE TAF SITES. THERE WILL HOWEVER BE SOME SCT LOW CLOUDS DOWN TO
3K FT AGL AND CIGS BETWEEN 4K TO 6K FT AGL AT TIMES AT THESE
LOCATIONS THROUGH THE REST OF THIS MORNING. DURING THE LATE MORNING
AND AFTERNOON HOURS EXPECT IMPROVING CONDITIONS WITH JUST A FEW OR
SCT MID TO HIGH LEVEL CLOUDS.

VFR CONDITIONS WITH OCCASIONAL MVFR CIGS/VIS WILL PREVAIL AT KPDT,
KALW AND KPSC IN SHOWERS AND RAIN THROUGH 05/18-21Z. CIGS MAY LOWER
TO 2K TO 5K FT AGL AT THESE LOCATIONS, MAINLY FROM 05/09Z TO 05/21Z.
VIS MAY TEMPORARILY BE REDUCED TO BETWEEN 3 TO 5 SM IN ANY PERIODS
OF STEADIER RAIN, ESPECIALLY AT KPDT AND KALW, MAINLY BETWEEN 05/11Z
AND 05/19Z. CONDITIONS SHOULD IMPROVE BY MIDDAY AT KPDT AND KPSC,
WITH IMPROVING CONDITIONS EXPECTED BY MID TO LATE AFTERNOON AT KALW.

WESTERLY WINDS WILL BE QUITE BREEZY AT TIMES...WITH MOST LOCATIONS
SEEING GUSTS BETWEEN 15 TO 25 KTS STARTING SATURDAY MORNING INTO THE
LATE AFTERNOON AND EARLY EVENING HOURS. WINDS WILL DIMINISH TO AOB
12 KTS AROUND SUNSET TODAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  64  46  71  48 /  80  20  10  10
ALW  64  52  72  53 /  90  30  10  10
PSC  70  49  75  51 /  80  20  10  10
YKM  71  45  71  46 /  10  10  20  10
HRI  71  48  75  50 /  80  20  10  10
ELN  67  47  71  46 /  10  10  20  10
RDM  63  33  70  36 /  10   0   0   0
LGD  56  40  68  42 /  80  40  10  10
GCD  61  36  71  39 /  70  20  10   0
DLS  70  52  75  53 /  10  10  10  10

&&

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

WA...NONE.
&&

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

$$

79/99/99


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