Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 241735
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1035 AM PDT SUN MAY 24 2015

.UPDATE...AN UPPER LEVEL LOW OVER BRITISH COLUMBIA IS MOVING
SOUTHEAST. MOSTLY CLEAR SKIES OVER SOUTHEAST WASHINGTON AND
EASTERN OREGON THIS MORNING BUT EXPECT MORE CU DEVELOPMENT THIS
AFTERNOON AS AFTERNOON HEATING INCREASES INSTBILITY. REST OF
FORECAST ON TRACK.  COONFIELD

&&

.AVIATION...18Z TAFS...VFR CONDITIONS WILL OCCUR FOR THE NEXT 24
HOURS. MOST SITES WILL SEE SCATTERED HIGH CLOUDS MOVING OVER THE
AREA. HOWEVER...THERE COULD BE SHOWERS IN THE VICINITY OF KYKM THIS
AFTERNOON OR EVENING. WINDS WILL BE AROUND 10 KTS...EXCEPT 15 TO 20
KTS AT KDLS.  82

&&

.PREV DISCUSSION... /ISSUED 445 AM PDT SUN MAY 24 2015/

SHORT TERM...TODAY THROUGH MONDAY NIGHT...GENERALLY WILL SEE A
NORTHWEST UPPER LEVEL FLOW OVER THE REGION THROUGH TONIGHT. A WEAK
UPPER LEVEL LOW OVER SOUTHWEST BRITISH COLUMBIA IS EXPECTED TO
DEEPEN SLIGHTLY LATER TONIGHT, THEN DRIFT SOUTHEAST THROUGH EASTERN
WASHINGTON STATE MONDAY AND MONDAY NIGHT. THE NORTHWEST FLOW TODAY
AND TONIGHT, COMBINED WITH ONSHORE LOW LEVEL FLOW, WILL CONTINUE TO
DRY THE AIR MASS OVER THE REGION. THUS CHANCES OF SHOWERS AND
THUNDERSTORMS, MAINLY IN THE AFTERNOON AND EVENING, WILL BE LIMITED
TO SOUTH CENTRAL WASHINGTON AND OUR EASTERN MOUNTAIN ZONES. THE
UPPER LOW DRIFTING INTO EASTERN WASHINGTON MONDAY WILL INCREASE THE
ONSHORE LOW LEVEL, WHICH TENDS TO BE RATHER STABLE, INTO CENTRAL
OREGON AND THE COLUMBIA BASIN. THUS SHOWERS AND THUNDERSTORMS WILL
BE LIMITED TO WASHINGTON CASCADE EAST SLOPES AND OUR EASTERN
MOUNTAIN ZONES. HIGH AND LOW TEMPS WILL CONTINUE TO BE NEAR TO
SLIGHTLY ABOVE SEASONAL. BREEZY CONDITIONS WILL CONTINUE THROUGH THE
GORGE AND IN THE KITTITAS VALLEY. 90

LONG TERM...TUESDAY THROUGH SATURDAY...A MID/UPPER LEVEL LOW
PRESSURE SYSTEM DROPS SOUTHEAST INTO THE INTERIOR PACIFIC  NORTHWEST
ON TUESDAY WITH THE LOW BRINGING A CHANCE OF SHOWERS IN THE
MOUNTAINS AND A SLIGHT CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS
IN THE MOUNTAINS. THE LOW DRIFTS SLOWLY EAST INTO IDAHO ON WEDNESDAY
THUS KEEPING THE REGION IN A WRAP AROUND FLOW WITH MOISTURE
CONTINUING OVER THE EASTERN MOUNTAINS FOR A CHANCE OF SHOWERS WITH A
SLIGHT CHANCE OF AFTERNOON/EVENING THUNDERSTORMS IN THE MOUNTAINS.
THURSDAY THROUGH SATURDAY WEAK FLOW ALOFT ON THE EAST FLANK OF A
RIDGE OFFSHORE KEEPS THE REGION IN AN UNSETTLED REGIME FOR A CHANCE
OF SHOWERS EACH DAY OVER THE MOUNTAINS AND A SLIGHT CHANCE OF
AFTERNOON/EVENING THUNDERSTORMS OVER THE MOUNTAINS THROUGH SATURDAY.
POLAN

AVIATION...12Z TAFS...VFR CONDITIONS WILL OCCUR FOR THE NEXT 24
HOURS. THERE MAY BE OCCASIONAL SCATTERED SHOWERS OR A FEW ISOLATED
THUNDERSTORMS OVER THE EAST SLOPES OF THE WASHINGTON CASCADES IN THE
AFTERNOON OR EARLY EVENING. WINDS WILL BE LESS THAN 10 KTS.  POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  78  51  77  49 /  10  10  10  10
ALW  79  55  78  53 /  10  10  10  10
PSC  85  54  82  52 /  10  10  10  10
YKM  84  54  81  52 /  20  20  10  20
HRI  83  52  81  50 /  10  10  10  10
ELN  81  53  78  54 /  20  20  10  20
RDM  76  39  76  36 /  10  10  10  10
LGD  73  47  73  45 /  20  20  20  20
GCD  76  44  76  43 /  20  10  20  20
DLS  74  54  74  53 /  10  10  10  10

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...NONE.
&&

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

$$

76/82/82



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