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AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
200 AM PDT THU MAY 28 2015

.SHORT TERM...TODAY THROUGH SATURDAY...AN UPPER LOW PRESSURE SYSTEM 
OVER IDAHO WILL MOVE TO THE SOUTHEAST TODAY AND AWAY FROM THE 
FORECAST AREA. HOWEVER THERE WILL STILL BE SOME LINGERING MOISTURE 
ALONG WITH SOME AFTERNOON INSTABILITY TO WARRANT A MENTION OF A 
SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS OVER THE NORTHEAST 
MOUNTAINS AND THE WASHINGTON CASCADE EAST SLOPES. AN UPPER RIDGE 
WILL BUILD OVER THE FORECAST AREA TONIGHT AND FRIDAY. THIS WILL KEEP 
A WARMING TREND GOING WITH MAXIMUM TEMPERATURES IN THE MID 80S IN 
THE LOWER ELEVATIONS AND MOSTLY 60S AND 70S IN THE MOUNTAINS. THE 
UPPER RIDGE WILL NOT BE TOO STRONG AND IT WILL ALLOW MOISTURE AND 
INSTABILITY WILL INCREASE AGAIN IN THE AFTERNOON FRIDAY FOR A SLIGHT 
CHANCE OF AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS OVER MOST 
OF THE FORECAST AREA. THE BEST CHANCE WILL BE OVER THE NORTHEAST 
MOUNTAINS AND THE CASCADE EAST SLOPES. THE UPPER RIDGE WILL REMAIN 
IN PLACE ON SATURDAY HOWEVER THERE WILL STILL BE SOME MOISTURE AND 
INSTABILITY OVER THE EASTERN THIRD OF THE CWA. THIS WILL RESULT IN A 
SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS IN THE AFTERNOON OVER THE 
SOUTHEAST HALF OF THE FORECAST AREA ON SATURDAY. THE WARMING TREND 
WILL CONTINUE ON SATURDAY WITH HIGHS REACHING AROUND 90 IN THE LOWER 
ELEVATIONS WITH 70S TO AROUND 80 IN THE MOUNTAINS. WINDS WILL BE 
LIGHT THROUGH THE SHORT TERM PERIOD. 88

.LONG TERM...FLAT RIDGE OVER THE AREA WILL GIVE WAY TO INCREASING 
SLY FLOW ON SUNDAY AS A POTENT SHORTWAVE TROUGH MOVES ACROSS THE 
REGION SUNDAY EVENING. THIS WILL BE FOLLOWED BY AN UPPER LEVEL LOW 
MONDAY THAT WILL GRADUALLY WEAKEN AS IT MEANDERS ACROSS THE PACIFIC 
NW FOR MUCH OF THE WEEK. SETUP APPEARS FAVORABLE FOR A ROUND OF 
STRONG STORMS ON SUNDAY EVENING DEPENDING ON THE AMOUNT OF AVAILABLE 
INSTABILITY. IT WILL BE PLENTY WARM WITH AFTERNOON HIGHS AROUND 90 
LOWER ELEVATIONS BUT WOULD FEEL A LITTLE MORE COMFORTABLE WITH THE 
POTENTIAL IF THE SFC DEW POINTS WERE PROGGED TO BE HIGHER. THE GFS 
HAS 30S DEW POINTS WORKING INTO THE SRN FORECAST AREA SUNDAY 
AFTERNOON CHOKING OFF THE INSTABILITY ACROSS THE SOUTH. HOWEVER 
ACROSS THE NORTHERN THIRD OF OREGON INTO FAR SRN WASHINGTON 
INSTABILITY WILL BE SUFFICIENT FOR ORGANIZED STORMS GIVEN THE STRONG 
VERTICAL WIND SHEAR. BY MONDAY A COLD FRONT WILL SWEEP ACROSS THE 
AREA WITH THE POTENTIAL FOR A STRONG STORM OR TWO CONFINED TO THE 
FAR NORTHEAST. WINDS MAY ALSO PUSH ADVISORY LEVELS IN THE COLUMBIA 
BASIN. FOR THE REST OF THE PERIOD A COOL DOWN IS EXPECTED WITH HIGHS 
MOSTLY IN THE 70S LOWER ELEVATIONS AND 50S/60S MOUNTAINS. LOWS WILL 
BE IN THE 50S LOWER ELEVATIONS AND 30S/40S IN THE MOUNTAINS. THERE 
WILL BE A DECREASING THREAT OF SHOWERS EACH DAY AS THE UPPER LOW 
WEAKENS AND GRADUALLY PUSHES TO THE EAST. 78

&&

.AVIATION...12Z TAFS...MOSTLY CLEAR SKIES ARE EXPECTED TODAY WITH 
JUST A FEW CU AT 6-7K FEET. A FEW BUILDUPS CAN BE EXPECTED OVER THE 
MOUNTAINS. SOME CIRRUS WILL MOVE OVER THE AREA TONIGHT. WINDS WILL 
GENERALLY BE LESS THAN 10 KT BUT 10-15 KT AT KDLS THIS AFTERNOON. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  81  55  86  60 /   0  10  20  20 
ALW  83  60  88  64 /  10  10  20  20 
PSC  87  56  91  61 /   0   0  20  20 
YKM  85  56  87  60 /  10  10  20  20 
HRI  85  55  90  62 /   0   0  20  20 
ELN  85  55  87  57 /  10  10  20  20 
RDM  80  46  82  50 /   0  10  20  20 
LGD  77  49  81  55 /  20  10  20  20 
GCD  80  47  84  54 /  10  10  20  20 
DLS  88  58  90  61 /   0   0  20  20 

&&

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

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

$$

88/78/78

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