Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 290517
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1017 PM PDT SAT MAR 28 2015

UPDATED AVIATION DISCUSSION

.SHORT TERM...TONIGHT AND SUNDAY...FORECAST AREA WILL BE UNDER A
FLAT RIDGE OF HIGH PRESSURE WITH SOME MID AND HIGH LEVEL MOISTURE
MOVING OVER THE REGION FOR PARTLY TO MOSTLY CLOUDY CONDITIONS. COULD
SEE A FEW SHOWERS ALONG THE CREST OF THE WASHINGTON CASCADES BUT
OTHERWISE DRY. TEMPERATURES WILL BE A FEW DEGREES WARMER ON SUNDAY
AND WINDS WILL BE LIGHTER.

.AVIATION...06Z TAFS...VFR CONDITIONS WILL PREVAIL OVER THE NEXT 24
HOURS. SOME MID AND HIGH LEVELS CLOUDS WILL PASS OVER THE REGION
OVERNIGHT THROUGH MIDDAY SUNDAY PRODUCING SCT-BKN 100-150 MSL. ALL
TAF SITES WILL REMAIN BELOW 12 KTS.

&&

.PREV DISC... /ISSUED 230 PM PDT SAT MAR 28 2015/

SHORT TERM...TONIGHT THROUGH TUESDAY. WESTERLY FLOW ALOFT TONIGHT
INTO SUNDAY. SATELLITE SHOWING A FAIR AMOUNT OF MID AND HIGH LEVEL
CLOUDS OFFSHORE SO EXPECTING PARTLY TO MOSTLY CLOUDY SKIES. SURFACE
WINDS ARE DECREASING THIS AFTERNOON AS HIGH PRESSURE BUILDS IN. THIS
TREND WILL CONTINUE INTO THE EVENING HOURS WITH LIGHT WINDS LATER
TONIGHT. HIGH TEMPS TOMORROW SHOULD BE MOSTLY IN THE 60S. THE FLOW
ALOFT TURNS A LITTLE MORE SOUTHWEST ON MONDAY AS ANOTHER UPPER LEVEL
TROUGH APPROACHES THE COAST. TEMPS WILL BE WARMER WITH PARTLY CLOUDY
SKIES. THE UPPER TROUGH AND COLD FRONT WILL MOVE THROUGH THE AREA
LATE MONDAY NIGHT AND TUESDAY BRINGING A CHANCE OF RAIN. BREEZY TO
WINDY CONDITIONS TUESDAY AFTER FRONTAL PASSAGE WITH MUCH COOLER
TEMPERATURES. 94

LONG TERM...TUESDAY NIGHT THROUGH SATURDAY...A BROAD TROUGH WILL BE
OVER THE AREA TUESDAY NIGHT AND A FRONT WILL BE MOVING THROUGH THE
AREA. THERE WILL BE A CHANCE OF SHOWERS IN THE MOUNTAINS AND A
SLIGHT CHANCE IN THE LOWER ELEVATIONS. COLDER AIR WITH THIS SYSTEM
WILL BRING SNOW LEVELS DOWN TO AROUND 3500 FEET AND THE MOUNTAINS
WILL SEE A COUPLE OF INCHES OF SNOW. THE EVENING LOOKS WINDY WITH 20
TO 30 MPH WINDS OVER MUCH OF THE AREA. THE WIND AND THE SHOWERS WILL
TAPER OFF OVERNIGHT. MODELS SHOW ANOTHER DISTURBANCE MOVING INTO THE
AREA WEDNESDAY AFTERNOON WITH ANOTHER CHANCE OF RAIN AND SNOW
SHOWERS IN THE MOUNTAINS AND A SLIGHT CHANCE OF RAIN SHOWERS IN THE
LOWER ELEVATIONS THROUGH WEDNESDAY NIGHT. SNOW LEVELS WILL BE AROUND
3000 TO 3500 FEET. ON THURSDAY THE TROUGH WILL LEAVE TO THE EAST AND
A RIDGE WILL BUILD OFFSHORE. THIS WILL KEEP US IN A NORTHWESTERLY
FLOW. THIS WILL BE A SLIGHT CHANCE OF LINGERING SHOWERS IN THE
MORNING THEN A SLIGHT CHANCE OF UPSLOPE RAIN AND SNOW SHOWERS IN THE
MOUNTAINS IN THE AFTERNOON. THURSDAY NIGHT THROUGH FRIDAY MORNING
WILL BE A BREAK BETWEEN SYSTEMS WITH DRY WEATHER. FRIDAY AFTERNOON
THROUGH SATURDAY THE GFS BRINGS A FRONT AND STRONG TROUGH INTO THE
AREA WITH A CHANCE OF RAIN AND MOUNTAIN SNOW. THE ECMWF HAS A WEAKER
SYSTEM THAT IS MUCH SLOWER TO COME ASHORE AND IS JUST CROSSING THE
CASCADES BY SATURDAY AFTERNOON. FOR NOW HAVE SPLIT THE DIFFERENCE
AND HAVE A CHANCE OF RAIN AND SNOW IN THE MOUNTAINS AND A SLIGHT
CHANCE OF RAIN IN THE LOWER ELEVATIONS FOR FRIDAY THROUGH SATURDAY.
TEMPERATURES WILL BE NEAR NORMAL WITH HIGHS IN THE 50S AND LOWER 60S
AND MAINLY 40S AND LOWER 50S IN THE MOUNTAINS. LOWS WILL BE IN THE
30S AND LOWER 40S WITH 20S AND LOWER 30S IN THE MOUNTAINS. PERRY



&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  40  65  41  69 /   0   0   0   0
ALW  43  66  44  70 /   0   0   0   0
PSC  42  68  41  72 /   0   0   0   0
YKM  39  66  39  68 /   0   0  10   0
HRI  41  68  39  72 /   0   0   0   0
ELN  38  65  38  67 /   0  10  10   0
RDM  32  65  33  69 /   0   0   0   0
LGD  34  62  35  68 /   0   0   0  10
GCD  36  64  33  71 /   0   0  10  10
DLS  41  68  40  71 /   0  10  10  10

&&

.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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