Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 281458
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
800 AM PDT SAT MAR 28 2015

.SHORT TERM...SATELLITE SHOWING RAPID CLEARING THIS MORNING AS COLD
FRONT MOVES OFF TO THE EAST. EXPECT CLEAR TO PARTLY CLOUDY SKIES
TODAY. MUCH COOLER WITH HIGHS DOWN 10-15 DEGREES FROM YESTERDAY.
WESTERLY WINDS MIXING DOWN WILL RESULT IN BREEZY TO WINDY CONDITIONS
THROUGH THE AFTERNOON FOR THE COLUMBIA BASIN. MID AND HIGH LEVEL
CLOUDS OFFSHORE WILL LIKELY MOVE ACROSS THE REGION TONIGHT AND
SUNDAY WITH THE WESTERLY FLOW ALOFT. 94

&&

.PREV DISC... /ISSUED 437 AM PDT SAT MAR 28 2015/

SHORT TERM...TODAY THROUGH MONDAY...A COLD FRONT IS CURRENTLY
MOVING THROUGH THE BLUE MOUNTAINS AND FOOTHILLS AT THIS TIME WITH
SOME FAIRLY DECENT RAIN SHOWERS AND A FEW EMBEDDED THUNDERSTORMS.
EXPECT THIS FRONT TO MOVE TO THE IDAHO BORDER AND OUT OF THE
FORECAST AREA BY AROUND DAYBREAK. BREEZY TO WINDY CONDITIONS HAVE
DEVELOPED WITH THE COLD FRONT WITH TIGHT PRESSURE GRADIENTS. THE
STRONGEST WINDS WILL BE OVER THE BLUE MOUNTAIN FOOTHILLS AND THE
LOWER COLUMBIA BASIN OF BOTH OREGON AND WASHINGTON. HAVE A WIND
ADVISORY FOR THESE AREAS UNTIL 21Z (2 PM PDT) TODAY. PRESSURE
GRADIENTS WILL THEN WEAKEN THIS AFTERNOON AND WINDS WILL DIMINISH.
COOLER AND MORE STABLE DRY AIR WILL MOVE INTO THE CWA TONIGHT AND
SUNDAY WITH A BROAD FLAT RIDGE DEVELOPING OVER THE REGION. THIS
RIDGE WILL PERSIST INTO MONDAY WITH CONTINUED DRY AND STABLE
CONDITIONS. TEMPERATURES WILL BE COOLER THAN THEY HAVE BEEN THE PAST
COUPLE OF DAYS BUT WILL BEGIN TO WARM UP AGAIN ON SUNDAY. 88

LONG TERM...MONDAY NIGHT THROUGH FRIDAY...HIGH PRESSURE WILL BEGIN
TO BREAK DOWN AS THE NEXT WEATHER SYSTEM WILL MOVE IN MONDAY EVENING
AND PROVIDE A CHANCE FOR SHOWERS ACROSS THE INTERIOR PACIFIC
NORTHWEST.  A MOIST PROGRESSIVE WESTERLY FLOW WILL DOMINATE FOR THE
REMAINDER OF THE EXTENDED.  THIS WILL KEEP A CHANCE OF
SHOWERS...MAINLY OVER THE MOUNTAINS...WITH A SLIGHT CHANCE OVER THE
LOWER ELEVATIONS EACH DAY.  COOLER AIR WILL INTRUDE WITH THIS
WESTERLY FLOW AND WHILE SNOW LEVELS WILL GENERALLY BE 3500 FT AT
NIGHT AND ABOUT 4500 FT IN DURING THE DAY...WEDNESDAY NIGHT INTO
THURSDAY SNOW LEVELS MAY FALL TO 2500 FT. RIGHT NOW NO THUNDER IS IN
THE FORECAST FOR THE EXTENDED...BUT MODELS DO HINT AT SOME
INSTABILITY OVER THE MOUNTAINS EACH DAY. WILL WAIT FOR THE NEAR TERM
TO SEE IF THUNDER WILL BE NEEDED. LOWS MONDAY NIGHT WILL BE MILD AND
IN THE LOWER TO MID 40S FOR THE LOWER ELEVATIONS...WITH THE 30S
MOUNTAINS.  HIGHS WILL BE IN THE MID 50S TO LOWER 60S TUESDAY
ONWARD...WITH UPPER 40S TO LOWER 50S MOUNTAINS.  LOWS WILL BE IN THE
30S FOR THE LOWER ELEVATIONS...AND IN THE 20S MOUNTAINS.

AVIATION...12Z TAFS...SHOWERS MOVING OUT OF THE TAF AREA THIS
MORNING WITH BREEZY WEST WINDS TODAY.  EXPECT WINDS TO GUST FROM 25
TO 35 KTS BEFORE DECREASING AFTER 18Z TODAY.  CIGS WILL BE SCT
5-10KFT LIFTING TO 25KFT OVERNIGHT.  WEBER

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  64  38  63  43 /  10   0   0   0
ALW  66  41  63  46 /  10   0   0   0
PSC  67  42  66  43 /  10   0   0   0
YKM  66  37  63  40 /  10  10  10  10
HRI  67  41  66  41 /  10   0   0   0
ELN  62  37  62  40 /  10  10  10  10
RDM  61  31  63  34 /  10   0   0   0
LGD  60  34  59  38 /  10   0   0  10
GCD  60  33  61  36 /  10   0   0  10
DLS  66  39  65  42 /  10  10  10  10

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...WIND ADVISORY UNTIL 2 PM PDT THIS AFTERNOON ORZ044-507-508.

WA...WIND ADVISORY UNTIL 2 PM PDT THIS AFTERNOON WAZ028-029.

&&

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

$$

94





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