Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 260538 AAB
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1035 PM PDT SAT APR 25 2015

.UPDATE...LOW PRESSURE OVER THE PACNW WILL SLOWLY MOVE AWAY FROM THE
AREA OVERNIGHT. MEANWHILE ISOLD SHOWERS PERSIST ACROSS THE REGION
BUT WITH CLEARING SKIES LATER TONIGHT ESPECIALLY OVER THE WESTERN
ZONES TEMPERATURES ARE EXPECTED TO FALL BELOW FREEZING BY SUNDAY
MORNING OVER THIS AREA WHICH PROMPTED A FREEZE WARNING. OTHERWISE
MINOR ADJUSTMENTS WERE DONE TO THE SKY COVER AND THE PRESENT SHORT
TERM FORECAST APPEARS ON TRACK FOR NOW.

.AVIATION...MAINLY VFR CONDITIONS WILL PERSIST ACROSS ALL TAF SITES
INTO SUNDAY AFTERNOON WHEN LCL MVFR CEILINGS ARE POSSIBLE AFTER 20Z.

&&

.PREV DISCUSSION... /ISSUED 332 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

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  36  60  40  70 /  20   0   0   0
ALW  40  63  44  73 /  20   0   0   0
PSC  38  66  42  75 /  20   0   0   0
YKM  32  65  41  73 /  10   0   0  10
HRI  36  65  40  75 /  20   0   0   0
ELN  32  65  39  73 /  10   0  10  10
RDM  24  63  33  77 /  10   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 /  10  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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