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000
FXUS66 KPDT 101111 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
310 AM PST WED FEB 10 2010

UPDATED AVIATION DISCUSSION

.SHORT TERM...TODAY THROUGH FRIDAY...THE NEXT SYSTEM SEEN JUST OFF
SHORE WILL SLOWLY MOVE TO THE COAST TODAY. THE FORECAST AREA WILL BE
UNDER AN UPPER RIDGE OF HIGH PRESSURE. HOWEVER ABUNDANT MOISTURE
AHEAD OF THE NEXT WEATHER SYSTEM WILL MOVE INTO THE REGION OVER THE
TOP OF THE RIDGE AS THE RIDGE AXIS SLOWLY SHIFTS EASTWARD. THE DAY
WILL START OUT MOSTLY DRY...BUT CLOUDS WILL THICKEN AND LOWER WITH
PRECIPITATION SPREADING ACROSS THE FORECAST AREA BY THIS AFTERNOON
FROM WEST TO EAST. DUE TO THE SOUTHWEST FLOW BEHIND THE RIDGE AND
THE PRESENCE OF THE RIDGE ITSELF TEMPERATURES WILL BE MILD WITH HIGH
SNOW LEVELS SO THERE WILL NOT BE ANY CONCERN FOR ANY WINTER PRECIP
ADVISORIES. ALL AREAS SHOULD RECEIVE AT LEAST SEVERAL HUNDRETHS TO
SEVERAL TENTHS OF AN INCH OF RAIN DURING THE NEXT 24 HOURS. ANOTHER
WEATHER SYSTEM WILL QUICKLY FOLLOW BEHIND THE FIRST ON THURSDAY AND
WILL ACCOMPANY A RATHER TIGHT BUT NARROW UPPER TROUGH. THE PRESSURE
GRADIENTS BETWEEN THESE TWO SYSTEMS WILL CAUSE MODERATE TO STRONG
LOW LEVEL WINDS ACROSS THE CASCADES RESULTING IN A LEE SIDE TROUGH
TO DEVELOP ALONG WITH WINDY CONDITIONS...MAINLY IN CENTRAL OREGON.
AT THIS TIME THE WINDS ARE NOT EXPECTED TO EXCEED ADVISORY
CRITERIA...BUT WINDY CONDITIONS ARE LIKELY NEVERTHELESS. STRONGEST
WINDS WILL OCCUR FROM THIS AFTERNOON THROUGH THURSDAY EVENING...AND
THEN WILL DIMINISH. HOWEVER...YET ANOTHER WEATHER SYSTEM WILL MOVE
INTO THE FORECAST AREA ON FRIDAY WITH ANOTHER SHOT OF PRECIPITATION.
TEMPERATURES WILL CONTINUE TO BE MILD WITH FAIRLY HIGH SNOW LEVELS
THROUGH FRIDAY AND LIKELY BEYOND. AS SUCH WITH THESE THREE SYSTEMS
AND MOUNTAIN SNOW MELT TAKING PLACE THERE MAY BE SIGNIFICANT RISES
ON RIVERS AND STREAMS THROUGH THE REMAINDER OF THE WEEK INTO THE
WEEKEND. WILL NEED TO MONITOR THIS CLOSELY FOR THE POSSIBLE NEED OF
HYDROLOGY ADVISORIES OR WARNINGS. 88

.LONG TERM...FRIDAY NIGHT THROUGH TUESDAY...PROGRESSIVE WESTERLY
FLOW WILL PERSIST DURING THIS TIME PERIOD. A WAVE WILL MOVE THROUGH
EASTERN WASHINGTON AND OREGON FRIDAY NIGHT BRINGING A CHANCE OF
SHOWERS TO THE AREA. MORE WAVES WILL MOVE THROUGH SATURDAY NIGHT AND
SUNDAY. UPSLOPE SHOWERS WILL LINGER IN THE MOUNTAINS SUNDAY NIGHT
THROUGH TUESDAY. SNOW LEVELS WILL REMAIN HIGH...SO SNOW ACCUMULATION
WITH THESE SYSTEMS WILL REMAIN LOW. TEMPERATURES WILL REMAIN MILD.
COONFIELD

&&

.AVIATION...12Z TAFS. SCT-BKN 080 MSL WITH PATCHY FOG WILL PERSIST
THIS MORNING. PATCHY FOG IS POSSIBLE WEDNESDAY MORNING. INCREASING
CLOUDS IN THE AFTERNOON WITH APPROACHING WARM FRONT. RAIN LIKELY FOR
ALL TAF SITES WEDNESDAY EVENING WITH CEILINGS 020-040. SURFACE WINDS
LESS THAN 10KT.  78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  48  36  48  37 /  20  50  50  30
ALW  48  35  46  40 /  20  50  40  30
PSC  47  35  49  38 /  20  40  40  30
YKM  46  31  45  33 /  30  50  40  30
HRI  48  37  49  36 /  20  50  40  30
ELN  44  30  42  33 /  30  50  40  40
RDM  49  34  52  33 /  30  60  50  30
LGD  41  31  45  38 /  10  50  50  50
GCD  44  32  49  35 /  10  60  50  30
DLS  49  36  50  40 /  40  70  50  30

&&

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

THREAT INDEX
TODAY : GREEN
THURSDAY : GREEN
FRIDAY : GREEN

GREEN: NONE OR LIMITED NEED FOR WATCHES, WARNINGS, OR ADVISORIES.
YELLOW: A FEW WATCHES, WARNINGS, OR ADVISORIES POSSIBLE OR IN EFFECT.
RED: NUMEROUS WATCHES, WARNINGS, OR ADVISORIES POSSIBLE OR IN EFFECT.

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

$$

88/76/76