Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 222341 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
340 PM PST SAT NOV 22 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...TONIGHT THROUGH MONDAY. THE LATEST IR SATL WAS SHOWING
COOLING CLOUD TOPS OVER THE EASTERN HALF OF THE REGION. RAIN SHOWERS
HAD DEVELOPED RAPIDLY OVER THIS SAME AREA AND WERE TRACKING EAST.
THE SHOWERS WERE ASSOCIATED WITH A LOW PRESSURE SYSTEM THAT IS
FORECAST TO MOVE ACROSS THE REGION TONIGHT. THE BEST CHANCES FOR
RAIN WILL BE OVER THE BLUE/WALLOWAS AND ALONG THE WA/OR CASCADES IN
A PERSISTENT UPSLOPE FLOW OVERNIGHT. SNOW LEVELS WILL HOVER AROUND
4K FEET WITH SOME SNOW ACCUMULATIONS POSSIBLE ABOVE THIS HEIGHT SUCH
AS IN TOLLGATE. AS THE LOW PRESSURE SYSTEM MOVES AWAY FROM THE AREA
OVERNIGHT...ANOTHER STORM WILL QUICKLY REPLACE THIS TOMORROW.

A SECOND LOW PRESSURE SYSTEM WILL DROP SOUTH FROM CANADA AND EFFECT
THE REGION SUNDAY. ANOTHER ROUND OF CLOUDS AND SHOWERS CAN BE
EXPECTED FOR MOST LOCATIONS BEFORE DRIER AIR INVADES THE REGION
EARLY MONDAY. ALTHOUGH THE SHOWERS MAY LINGER IN THE
MOUNTAINS...MOST AREAS WILL EXPERIENCE DRIER CONDITIONS WITH COOLER
MONDAY AFTERNOON HIGH TEMPERATURES.

.LONG TERM...MONDAY NIGHT THROUGH SATURDAY...THE 12Z ECMWF AND GFS
HAVE COME INTO MUCH BETTER AGREEMENT THROUGH THE LONG TERM PERIOD.
RAIN AND HIGH MOUNTAIN SNOW WILL AGAIN BE POSSIBLE MONDAY NIGHT AND
TUESDAY...ESPECIALLY TO THE NORTH. SOUTHWESTERLY WINDS WILL ALSO
INCREASE DURING THIS TIME AND DAYTIME TEMPERATURES WILL RISE INTO
THE 50S AS HIGH PRESSURE BUILDS FROM THE SOUTH. MUCH DRIER WEATHER
AND MILD TEMPERATURES CAN THEN BE EXPECTED TUESDAY NIGHT THROUGH
WEDNESDAY NIGHT WITH THE STORM TRACK REMAINING TO THE NORTH. THE
RIDGE WILL START TO BREAK DOWN ON THURSDAY AND THERE WILL BE A
CHANCE OF LIGHT RAIN AS WELL AS SLIGHTLY COOLER TEMPERATURES.
PERIODS OF RAIN AND MOUNTAIN SNOW WILL BE POSSIBLE ON FRIDAY AND
SATURDAY AS A DEEP PACIFIC LOW APPROACHES THE PACIFIC NORTHWEST.
COBB

&&

.AVIATION...00Z TAFS...MAINLY VFR CONDITIONS CAN NOW BE EXPECTED
ACROSS THE AREA THE NEXT 24 HOURS. HOWEVER...RAIN AT KALW WILL CAUSE
MVFR CONDITIONS FOR THE NEXT HOUR. DUE TO INCREASED WIND AND BETTER
MIXING...DENSE FOG IS NOT LIKELY TO REFORM OVERNIGHT. WINDS WILL
INCREASE WITH GUSTS 20 TO 30 KTS. WINDS WILL THEN BECOME STEADY 5 TO
12 KTS SUNDAY MORNING...BEFORE INCREASING AGAIN SUNDAY AFTERNOON.
82

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  36  47  34  46 /  20  30  20  10
ALW  38  47  35  46 /  20  40  20  10
PSC  37  49  34  46 /  20  30  10  10
YKM  29  46  31  45 /  20  20  10  10
HRI  37  49  33  48 /  20  30  10  10
ELN  31  44  28  45 /  20  30  10  10
RDM  28  45  27  43 /  30  20  10  10
LGD  36  39  31  39 /  50  60  30  10
GCD  29  41  22  38 /  40  30  30  10
DLS  37  47  35  48 /  30  40  20  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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