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AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
220 PM PDT SAT APR 25 2015

.SHORT TERM...TONIGHT THROUGH TUESDAY...AN UPPER LEVEL TROUGH WILL 
CONTINUE SLOWLY MOVING ACROSS THE FORECAST AREA THIS AFTERNOON AND 
OVERNIGHT. SHOWERS WILL CONTINUE THROUGH THE EVENING WITH A SLIGHT 
CHANCE OF THUNDERSTORMS IN SOME AREAS BUT OVERALL ACTIVITY WILL 
BEGIN TO DECREASE RAPIDLY AFTER SUNSET. EXPECT CLEARING SKIES 
OVERNIGHT WHICH WILL ALLOW FOR SOME COLD TEMPERATURES AND POSSIBLE 
FREEZING TEMPERATURES IN SOME AREAS WHERE GROWING SEASON IS 
UNDERWAY. THUS A FREEZE WARNING HAS BEEN ISSUED FOR SOME ZONES. 

RIDGE OF HIGH PRESSURE WILL COMMENCE BUILDING OVER THE REGION SUNDAY 
AND MONDAY BRINGING BACK A SPRING WARMING TREND. TEMPERATURES WILL 
CLIMB BACK INTO THE 60S AND 70S BY MONDAY. THE RIDGE WILL BEGIN 
SHIFTING EAST ON TUESDAY ALLOWING A WEAK FRONT TO ARRIVE LATE 
TUESDAY. THIS WILL BE ACCOMPANIED BY INCREASING WESTERLY WINDS AND 
TEMPERATURES STARTING TO COOL. 
 
 
 

.LONG TERM...TUESDAY NIGHT THROUGH SATURDAY...A FAST MOVING UPPER 
LEVEL DISTURBANCE WILL MOVE ACROSS EASTERN WASHINGTON AND OREGON 
TUESDAY NIGHT. MOISTURE IS LIMITED AND POPS WILL BE LOW. IT WILL BE 
WINDY IN SOME AREAS LATE TUESDAY...PARTICULARLY THE COLUMBIA RIVER 
GORGE AND  KITTITAS VALLEY. A STRONGER TROUGH WILL MOVE INTO THE 
AREA WEDNESDAY NIGHT AND THURSDAY BRINGING MORE SHOWERS. A FEW 
SHOWERS MAY LINGER FRIDAY. DRIER CONDITIONS WILL DEVELOP FRIDAY 
NIGHT AND SATURDAY AS A TRANSITORY RIDGE MOVES OVER WASHINGTON AND 
OREGON. MODELS HAVE SHOWN AN OVERALL PROGRESSIVE PATTERN IN RECENT 
RUNS BUT DETAILS HAVE VARIED AS IS COMMON IN A PROGRESSIVE PATTERN. 
THEREFORE I HAVE LOWER CONFIDENCE IN TIMING THAN NORMAL.  COONFIELD


&&

.AVIATION...18Z TAFS...VFR CONDITIONS WILL PREVAIL FOR THE NEXT 24 
HOURS BUT THERE MAY BE BRIEF PERIODS WHEN CIGS LOWER TO MVFR TODAY 
DUE TO SCATTERED SHOWERS. MID AND HIGH LEVEL CLOUDS WITH VARYING 
BASES BETWEEN 3500-15000 FEET AGL CAN BE EXPECTED.  WINDS WILL 
GENERALLY BE 10-20 KNOTS THIS AFTERNOON DECREASING TO 2-8 KNOTS 
OVERNIGHT. COONFIELD 


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  36  60  40  70 /  20   0   0   0 
ALW  40  63  44  73 /  30   0   0   0 
PSC  38  66  42  75 /  20   0   0   0 
YKM  32  65  41  73 /  20   0   0  10 
HRI  36  65  40  75 /  20   0   0   0 
ELN  32  65  39  73 /  20   0  10  10 
RDM  24  63  33  77 /  20   0   0   0 
LGD  33  58  37  69 /  30   0   0   0 
GCD  32  60  37  75 /  40   0   0   0 
DLS  39  69  43  79 /  20  10  10   0 

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...FREEZE WARNING FROM 2 AM TO 9 AM PDT SUNDAY FOR ORZ510.

WA...FREEZE WARNING FROM 2 AM TO 9 AM PDT SUNDAY FOR WAZ026-027.

&&

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

$$

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