Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 262111
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
211 PM PDT SUN APR 26 2015

.SHORT TERM...TONIGHT THROUGH WEDNESDAY...HIGH PRESSURE WILL
CONTINUE BUILDING OVER THE REGION WITH A WARM FRONT MOVING UP THE
COAST. THIS COULD BRING SOME LIGHT RAIN TO THE CASCADE CREST
OVERNIGHT BUT THE REST OF THE FORECAST AREA WILL REMAIN DRY. THE
HIGH PRESSURE WILL BOOST TEMPERATURES MONDAY 10 TO 15 DEGREES OVER
SUNDAYS HIGH TEMPERATURES. WARM TEMPERATURES WILL CONTINUE INTO
TUESDAY BUT EXPECT A COLD FRONT TO SWEEP THROUGH THE REGION IN THE
AFTERNOON AND EVENING PERIOD. THIS WILL USHER IN SOME BREEZY WEST
WINDS AND SOME LOW END CHANCE OF PRECIPITATION TUESDAY NIGHT
ASSOCIATED WITH THE FRONTAL PASSAGE. TEMPERATURES DROP AROUND 10
DEGREES WEDNESDAY WITH A COOLER BUT MOSTLY DRY WESTERLY FLOW OVER
THE FORECAST AREA.



.LONG TERM...WEDNESDAY NIGHT THROUGH SUNDAY...OVERALL CONFIDENCE IN
THE EXTENDED FORECAST IS LOW...AS RUN-TO-RUN CONTINUITY OF THE
DETERMINISTIC MODELS HAS BEEN POOR. MODELS HAVE SHOWN AN OVERALL
PROGRESSIVE PATTERN IN RECENT RUNS BUT DETAILS HAVE VARIED AS IS
COMMON IN A PROGRESSIVE PATTERN. AN UPPER LEVEL TROUGH WILL MOVE
THROUGH THE AREA WEDNESDAY NIGHT AND THURSDAY BRINGING SHOWERS...
MAINLY IN THE MOUNTAINS. A FEW SHOWERS AND BREEZY WINDS MAY LINGER
FRIDAY. DRIER CONDITIONS WILL DEVELOP FRIDAY NIGHT THROUGH SUNDAY AS
AN UPPER LEVEL RIDGE BUILDS OFFSHORE. DUE TO LOW CONFIDENCE IN
TIMING OF A FEW WEAK DISTURBANCES THAT WILL MOVE THROUGH THE
RIDGE...I LEFT A FEW SHOWERS IN THE MOUNTAINS SINCE DAYTIME HEATING
AND OROGRAPHIC LIFT IN WESTERLY FLOW CAN TRIGGER SHOWERS WITH THESE
DISTURBANCES.  COONFIELD


&&

.AVIATION...18Z TAFS... CLOUDS WILL INCREASE AS THE DAY PROGRESSES
WITH BKN-OVC CIGS MAINLY 6-10 KFT AGL. CLOUDS WILL DECREASE AFTER
15Z TOMORROW. WINDS WILL BE LESS THAN 10 KNOTS THROUGH THE PERIOD.
76


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  38  70  46  73 /   0   0   0   0
ALW  41  74  51  77 /   0   0   0   0
PSC  38  75  45  79 /   0   0   0   0
YKM  37  73  45  76 /  10   0   0   0
HRI  39  75  43  77 /   0   0   0   0
ELN  35  73  42  73 /  10   0   0   0
RDM  30  76  39  70 /   0   0   0   0
LGD  35  69  42  77 /   0   0   0   0
GCD  34  74  42  80 /   0   0   0   0
DLS  40  79  46  73 /  10   0   0  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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