Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 020552
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
955 PM PST SUN MAR 1 2015

.SHORT TERM...MID AND HIGH LEVEL CLOUDS QUICKLY SPREADING ACROSS THE
REGION THIS EVENING AS A STRONG JET PUSHES A SYSTEM INTO THE PACIFIC
NORTHWEST. CLOUDS APPEAR TO BE MOVING INTO THE AREA FASTER THAN
EARLIER MODELS HAD ANTICIPATED. HAVE UPDATED FORECAST FOR CLOUD
COVER AND MIN TEMPS. STILL EXPECTING VERY LIGHT AMOUNTS OF
PRECIPITATION AS THIS SYSTEM MOVES THROUGH TONIGHT AND MONDAY.
CHANCE OF SNOW SHOWERS OVER THE MOUNTAINS FOR THE MOST PART. SHOULD
SEE AN INCREASE IN NORTHWEST WINDS MONDAY AFTERNOON AND EVENING.
SKIES WILL BE CLEARING MONDAY NIGHT AS HIGH PRESSURE BUILDS BACK IN.
COLD DRY NORTHERLY FLOW TUESDAY WITH SUNNY SKIES. TUESDAY NIGHT
LOOKING COLD WITH LOWS ZERO TO 15.
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.AVIATION...06Z TAFS. WEAK SYSTEM MOVING ACROSS THE REGION OVERNIGHT
INTO MONDAY WITH CEILINGS MAINLY 050-100. WINDS LESS THAN 10KT
THROUGH MORNING THEN INCREASING FROM THE NW 10-20KT IN THE AFTERNOON
AND EVENING.

&&

.PREV DISC... /ISSUED 243 PM PST SUN MAR 1 2015/

SHORT TERM...TONIGHT THROUGH TUESDAY NIGHT...A WEAK SYSTEM MOVING
SOUTH ALONG THE BRITISH COLUMBIA COAST WILL APPROACH THE REGION
TONIGHT. THIS SYSTEM WILL TRACK SOUTH ALONG THE PACIFIC NORTHWEST
COAST TONIGHT THROUGH MONDAY MORNING. THE MAIN IMPACT OF THIS SYSTEM
WILL BE TO PUSH VARIABLE AMOUNTS OF MID AND HIGH CLOUDINESS ACROSS
THE AREA TONIGHT AND MONDAY MORNING. SOME LIGHT PRECIP, MAINLY SNOW,
WILL ALSO BE POSSIBLE ALONG THE CASCADE CREST AND OVER PORTIONS OF
THE CASCADE EAST SLOPES. THIS PRECIP SHOULD BE DONE BY MID MORNING
MONDAY. ANOTHER MODIFIED ARCTIC AIR MASS WILL THEN FILTER INTO THE
REGION STARTING MONDAY AFTERNOON. THIS AIR MASS WILL CONTINUE TO
PUSH SOUTH ACROSS THE REGION MONDAY NIGHT. LIGHT SHOWERS OF RAIN AND
SNOW WILL DEVELOP ALONG THE LEADING EDGE OF THIS AIR MASS OVER THE
EASTERN MOUNTAINS AND THE WASHINGTON CASCADE EAST SLOPES MONDAY
AFTERNOON. SNOW LEVELS IN THESE AREAS WILL RUN BETWEEN 2500 AND 4000
FEET WITH LIGHT ACCUMULATIONS. THESE SHOWERS SHOULD SPREAD TO AFFECT
PORTIONS OF THE BLUE MOUNTAIN FOOTHILLS AND THE SIMCOE HIGHLANDS IN
THE EVENING, THEN EVENTUALLY CENTRAL OREGON OVERNIGHT. SNOW LEVELS
WILL RUN BETWEEN 1200 AND 3500 FEET MONDAY EVENING, THEN DROP TO THE
LOWEST ELEVATIONS OVERNIGHT. AGAIN ACCUMULATIONS WILL BE LIGHT,
THOUGH 1 TO 2 INCHES MAY BE POSSIBLE IN WALLOWA COUNTY. LOCALLY
BREEZY NORTHERLY WINDS WILL BE POSSIBLE OVER PORTIONS OF THE
COLUMBIA BASIN MONDAY NIGHT. TUESDAY WILL SEE DRYING AND CLEARING
CONDITIONS WITH ONLY A FEW LINGERING MORNING SNOW SHOWERS IN WALLOWA
COUNTY. CONDITIONS WILL BE MOSTLY CLEAR AND COLD TUESDAY NIGHT. 90

LONG TERM...WEDNESDAY THROUGH SUNDAY...DRY NORTHERLY FLOW WILL
SHIFT NORTHWEST TOWARDS THE END OF THE WORK WEEK. A RIDGE OF HIGH
PRESSURE WILL CONTINUE TO BUILD OVER THE WEST COAST DURING THE
WEEKEND. RIGHT NOW IT LOOKS LIKE MID AND HIGH CLOUDS WILL BE
MINIMAL...THEREFORE MOSTLY SUNNY SKIES SHOULD RESULT. OVERNIGHT LOWS
WILL BE NEAR FREEZING FOR THE VALLEYS AND SLIGHTLY BELOW FREEZING
FOR THE MOUNTAINS. HIGHS WILL START TO PUSH INTO THE 60S BY THE
WEEKEND.  PRECIPITATION CHANCES ARE LESS THAN 10 PERCENT FOR THE
EXTENDED. WEBER

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  31  46  23  42 /   0  10  20   0
ALW  33  47  27  43 /   0  10  20   0
PSC  29  52  21  47 /   0  10  10   0
YKM  32  51  24  46 /  10  10   0   0
HRI  26  51  20  46 /   0  10  10   0
ELN  31  51  22  46 /  10  10  20   0
RDM  24  46  15  44 /  10  10  20   0
LGD  28  44  22  40 /   0  20  30  10
GCD  26  45  19  40 /   0  20  20  10
DLS  33  54  27  50 /  10  10   0   0

&&

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

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

$$

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