Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 272129
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
225 PM PDT THU AUG 27 2015

.SHORT TERM...TONIGHT THROUGH SATURDAY NIGHT. HIGH PRESSURE WILL
SLOWLY GIVE WAY TO AN INCOMING STORM SYSTEM TO TAKE AIM ON THE PACNW
SATURDAY WITH COOLER TEMPERATURES ALONG WITH WINDY CONDITIONS AND
BLOWING DUST.

LIGHT WINDS HAVE PRODUCED LITTLE MIXING THAT HAS CREATED SMOKEY
CONDITIONS OVER THE AREA AND THE AIR QUALITY ALERT HAS BEEN EXTENDED
THROUGH THE WEEKEND. A LOW PRESSURE SYSTEM WILL SLOWLY APPROACH THE
TWO STATE AREA TOMORROW SPREADING CLOUDS TO THE REGION. SHOWERS
SHOULD DEVELOP ALONG THE WA/OR CASCADES FRIDAY AFTN AND SPREAD EAST
INTO THE REMAINDER OF THE AREA FRIDAY NIGHT AND SATURDAY MORNING.
THE LIGHT SHOWERS WILL ACCOMPANY A COOL FRONT THAT IS FORECAST TO
RACE ACROSS OUR REGION SATURDAY MORNING CREATING WINDY CONDITIONS
AND AREAS OF BLOWING DUST. WIND GUSTS IN EXCESS OF 40-45 MPH ARE
LIKELY AND A WIND ADVISORY HAS BEEN ISSUED FOR SATURDAY. IN ADDITION
AND AS THE FRONT MOVES ACROSS THE AREA...THE ATMOSPHERE MAY BECOME
INCREASINGLY UNSTABLE TO PRODUCE AN ISOLD TSRA OVER THE FAR EASTERN
ZONES THAT INCLUDE THE BLUE/WALLOWA MTNS SATURDAY AFTN. DRIER
CONDITIONS SHOULD MOVE INTO THE AREA SATURDAY EVENING BEFORE ANOTHER
STORM SYSTEM BRINGS SHOWERS TO THE OR/WA CASCADES LATE SATURDAY
NIGHT.

FOR SUNDAY A BROAD UPPER LEVEL TROUGH WITH SEVERAL EMBEDDED
SHORTWAVE DISTURBANCES IS FORECAST TO REMAIN OVER THE REGION. WITH
THE WEST TO SOUTHWEST MID LEVEL FLOW MOST OF THE INCOMING MOISTURE
WILL BE RUNG OUT ALONG THE CASCADE CREST AND THE IMMEDIATE ADJACENT
EAST SLOPES OF THE CASCADES DURING THIS TIME. LEFT CHANCE TO LOW END
LIKELY POPS FOR RAIN SHOWERS IN THE FORECAST FOR THESE LOCATIONS.
FOR THE REMAINDER OF THE AREA EXPECT PARTLY CLOUDY SKIES...A SLIGHT
CHANCE OF RAIN SHOWERS AND BREEZY CONDITIONS. WEST WINDS ARE
FORECAST TO BE IN THE 10 TO 20 MPH RANGE WITH A FEW HIGHER GUSTS
OVER MUCH OF THE AREA DURING THIS TIME.


.LONG TERM...MONDAY THROUGH THURSDAY...A BROAD UPPER LEVEL TROUGH
WILL BE OVER THE REGION THROUGH THE FIRST OF THE WEEK. PRECIPITATION
WILL PRETTY MUCH BE CONFINED TO THE CASCADE REGION THROUGH TUESDAY
WITH BREEZY AND COOL CONDITIONS FOR THE REST OF THE FORECAST AREA.
MORE ENERGY DROPPING INTO THE TROUGH WEDNESDAY AND THURSDAY WILL
CAUSE HE TROUGH TO SETTLE OVER THE PACIFIC NORTHWEST AND LEAD TO
BETTER CHANCE OF PRECIPITATION ACROSS THE ENTIRE FORECAST AREA.
BELOW NORMAL TEMPERATURES WILL CONTINUE WEDNESDAY AND THURSDAY.

&&

.AVIATION...00Z TAFS...VFR CONDITIONS EXPECTED TO PREVAIL OVER THE
NEXT 24 HOURS AT ALL TAF SITES. THERE WILL BE SOME MID AND HIGH LVL
SCT-BKN CLOUDS WITH SFC VIS IN THE HAZE/SMOKE SHOULD IN THE 6 TO 10
SM RANGE AT MOST LOCATIONS. WITH WINDS LESS THAN 10 KTS OVERNIGHT
AND THEN 5-15KTS FRIDAY AFTERNOON. WINDS.

&&

.FIRE WEATHER DISCUSSION...WINDY ON SATURDAY. AN UPPER LEVEL LOW
WILL REMAIN OFFSHORE THROUGH FRIDAY WITH A SOUTHWEST FLOW ALOFT. THE
LOW WILL MOVE INLAND ACROSS THE PACIFIC NORTHWEST THIS WEEKEND. MAIN
CONCERN WILL BE INCREASING WEST TO SOUTHWEST WINDS SATURDAY. WINDS
WILL PEAK IN THE LATE MORNING AND AFTERNOON WITH MOST LOCATIONS
SEEING AT LEAST 15-25 MPH AND MANY AREAS AT 20-35 MPH WITH HIGHER
GUSTS. AS THE LOW MOVES INLAND IT WILL BRING COOLER TEMPERATURES AND
HIGHER HUMIDITY ALONG WITH A CHANCE OF SHOWERS AND THUNDERSTORMS. 94

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  91  59  87  61 /  10  10  10  20
ALW  93  64  90  65 /  10  10  10  10
PSC  95  60  91  61 /  10  10  10  20
YKM  92  57  85  56 /  10  10  10  40
HRI  94  58  90  61 /  10  10  10  20
ELN  91  57  84  55 /  10  10  20  50
RDM  88  51  85  54 /  10  10  10  30
LGD  90  53  92  51 /  10  10  10  10
GCD  93  45  92  54 /  10  10  10  10
DLS  92  62  88  63 /  10  10  20  50

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...WIND ADVISORY FROM 8 AM TO 8 PM PDT SATURDAY FOR ORZ041-044-507-
     508-510-511.

WA...WIND ADVISORY FROM 8 AM TO 8 PM PDT SATURDAY FOR WAZ024-026>029-
     521.

&&

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

$$

97/91/91/77/94


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