Area Forecast Discussion
Issued by NWS Pendleton, OR

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213
FXUS66 KPDT 131737
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
936 AM PST SAT FEB 13 2016

.SHORT TERM...MORNING UPDATE...CONDITIONS ARE FAIR AND MOSTLY FOG
FREE AS LOW LEVEL INVERSIONS HAVE BEEN MIXED OUT, EXCEPT IN PORTIONS
OF THE YAKIMA AND KITTITAS VALLEYS. FOG LINGERS OVER THE PORTION OF
THE YAKIMA VALLEY THAT CONTAINS YAKIMA AND SELAH. THIS FOG WILL LIFT
AND DISSIPATE THROUGH THE REMAINDER OF THE MORNING. WINDS ARE
LOCALLY BREEZY IN THE LOWER BASIN AND ALONG THE BLUE FOOTHILLS.
OVERALL WILL BE ABLE TO ALLOW THE AIR STAGNATION ADVISORIES TO
EXPIRE AT 10 AM. MAY HAVE TO EXTEND THE ADVISORY IN THE YAKIMA
VALLEY, AND POSSIBLY IN THE KITTITAS VALLEY, FOR ONE MORE DAY
THOUGH. SHOWERS AHEAD OF THE NEXT PACIFIC SYSTEM SHOULD BEGIN TO
SPREAD INTO AND EAST OF THE CASCADE CREST THIS AFTERNOON. UPDATES
INCLUDED REMOVING FOG FOR ALL AREAS EXCEPT AROUND YAKIMA FOR THIS
MORNING, AND ADJUSTING POPS, SKY COVER AND WINDS. 90

.LONG TERM...PREVIOUS DISCUSSION...A RIDGE OF HIGH PRESSURE REBUILDS
OVER THE REGION MONDAY NIGHT AND TUESDAY PUSHING MOST OF THE
MOISTURE NORTH OF THE AREA, BUT IT MAY STILL MAY CLIP NORTHWEST
KITTITAS COUNTY. THE MODELS BRING IN ANOTHER SYSTEM WITH MAINLY RAIN
BY WEDNESDAY AFTERNOON WITH THE GFS MODEL MUCH FASTER THAN THE
ECMWF. THE SNOW LEVEL IS EXPECTED TO DECREASE TO NEAR 5000 FEET IN
THE EAST SLOPES OF THE WASHINGTON CASCADES, TO NEAR 6000 FEET OVER
CENTRAL AND EASTERN OREGON WEDNESDAY NIGHT. THE TROUGH OF LOW
PRESSURE MOVES THROUGH THURSDAY WITH RAIN AND MOUNTAIN SNOW. IT
APPEARS THAT A RIDGE MOVES QUICKLY ACROSS THE REGION THURSDAY NIGHT.
THE MODELS ARE IN DISAGREEMENT FROM FRIDAY ONWARD AS THE ECMWF WANTS
TO BRING ANOTHER SYSTEM THROUGH THE AREA, WHILE THE GFS KEEPS THE
MAIN FRONT WELL OFFSHORE UNTIL THE WEEKEND. TEMPERATURES WILL REMAIN
QUITE MILD THROUGH THE PERIOD.

&&

.AVIATION...18Z TAFS...MAINLY VFR CONDITIONS ARE EXPECTED FOR THE
NEXT 12 HOURS...EXCEPT AT KYKM WHERE FOG AND LOW CIG WILL PERSIST
THROUGH AT LEAST 22Z. CLOUD COVER WILL INCREASE TODAY AS ANOTHER
SYSTEM MOVES INTO THE REGION WITH RAIN MOVING INTO KDLS AFTER 22Z
AND ACROSS THE REST OF THE REGION AFTER 00Z. MVFR CONDITIONS WILL
THEN BE POSSIBLE IN RAIN...WHICH WILL CONTINUE THROUGH SUNDAY
MORNING. WINDS WILL GENERALLY BE LESS THAN 15 KTS. 82

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  52  42  58  48 /  20  80  60  50
ALW  53  45  59  51 /  20  80  60  60
PSC  55  41  58  49 /  20  60  30  30
YKM  47  34  54  43 /  20  60  30  30
HRI  55  40  58  49 /  20  60  40  30
ELN  46  36  49  42 /  20  60  30  30
RDM  50  38  55  40 /  10  40  40  30
LGD  49  38  51  47 /  20  80  70  60
GCD  49  36  53  43 /  10  70  60  40
DLS  52  40  54  48 /  30  60  50  30

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...AIR STAGNATION ADVISORY UNTIL 10 AM PST THIS MORNING FOR ORZ041-
     044-050-505-507-508-510.

WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST THIS MORNING FOR WAZ024-
     026>029-520-521.

&&

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

$$

90/93/82



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