Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 271716 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
1016 AM PDT WED AUG 27 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...SATELLITE SHOWING CLEAR SKIES OVER THE REGION THIS
MORNING. 850MB TEMP FORECASTS SHOW TODAY BEING THE WARMEST DAY. MID
80S TO MID 90S FOR MANY LOCATIONS. UPPER RIDGE AND A VERY DRY
AIRMASS WILL CONTINUE TO BRING CLEAR SKIES THROUGH TONIGHT. WEAK
SHORT WAVE MOVES THROUGH LATER THURSDAY. THIS SYSTEM WILL PRODUCE
SOME MID AND HIGH LEVEL CLOUDS ALONG WITH SLIGHTLY COOLER
TEMPERATURES AND INCREASED WINDS IN THE AFTERNOON. 94

&&

.AVIATION...18Z TAFS...VFR CONDITIONS ARE EXPECTED FOR THE NEXT 24
HOURS. SKIES WILL GENERALLY BE CLEAR THOUGH SOME HIGH CIRRUS ABOVE
20000 FEET AGL WILL BEGIN TO MOVE INTO THE AREA AFTER 03Z THIS
EVENING. WINDS WILL REMAIN BELOW 15 KTS THOUGH KDLS MAY HAVE SOME
GUSTS TO 25 KTS THIS AFTERNOON FROM 21Z-04Z. PERRY

&&

.PREV DISC... /ISSUED 235 AM PDT WED AUG 27 2014/

SHORT TERM...TODAY THROUGH FRIDAY...A FLAT WESTERLY FLOW WILL
PREVAIL OVER THE REGION TODAY KEEPING CONDITIONS WARM AND DRY.
TEMPERATURES WILL CLIMB ANOTHER 3 TO 5 DEGREES TODAY MAKING IT THE
HOTTEST DAY OF THE WEEK UNDER SUNNY SKIES. WINDS WILL BE LIGHT BUT
LOOK FOR INCREASING WESTERLY WINDS ALONG THE EAST SLOPES OF THE
CASCADES BY AFTERNOON AND BECOMING LOCALLY BREEZY THROUGH THE
COLUMBIA GORGE AND THE KITTITAS VALLEY. A FAST MOVING SHORTWAVE IS
EXPECTED TO PASS THROUGH WASHINGTON ON THURSDAY. MODELS ARE
INDICATING SOME WEAK INSTABILITY OVER NORTHEAST OREGON LATE IN THE
DAY BUT FOR NOW THINKING WE WILL JUST SEE SOME INCREASING CLOUDS BUT
NO PRECIPITATION. TEMPERATURES WILL BEGIN TO COOL SLIGHTLY. BY
FRIDAY THE WESTERLY FLOW BEGINS TO DIP SOUTHWARD AS AN UPPER LEVEL
TROUGH APPROACHES FROM THE GULF OF ALASKA. THIS WILL PRODUCE FURTHER
COOLING AND THERE WILL BE SOME INCREASING WINDS MOST NOTABLY ALONG
THE EAST SLOPES OF THE CASCADES AND SPILLING OUT INTO THE COLUMBIA
BASIN.

LONG TERM...FRIDAY NIGHT THROUGH WEDNESDAY...A BROAD UPPER LEVEL
TROUGH WILL MOVE ACROSS THE REGION FRIDAY NIGHT AND SATURDAY WITH
FAST NORTHWESTERLY FLOW IN ITS WAKE FOR SUNDAY THROUGH WEDNESDAY.
GIVEN THE TRAJECTORY OF THE LOW AND WESTERLY FLOW THERE WONT BE MUCH
MOISTURE FOR SHOWERS. THUS EXPECT MOST ACTIVITY FRIDAY NIGHT THROUGH
SUNDAY TO BE LIMITED TO A FEW MOUNTAIN SHOWERS. ON MONDAY THERE IS
SOME UNCERTAINTY IN THE FORECAST AS THE GFS AND GEM MOVE A STRONG
SHORTWAVE ACROSS THE PACIFIC NW...WHILE THE ECMWF DOES NOT HAVE THIS
FEATURE. IF THE GFS/GEM ARE CORRECT THERE WOULD BE A CHANCE FOR
SHOWERS AREAWIDE ON MONDAY. FOR NOW HAVE INTRODUCED A SLIGHT CHANCE
OF MOUNTAIN SHOWERS TO TREND IN THAT DIRECTION GIVEN THE FORECAST
UNCERTAINTY. TUESDAY AND WEDNESDAY LOOK TO BE MOSTLY DRY ALTHOUGH
THE GFS CARVES OUT ANOTHER POTENT TROUGH ON WEDNESDAY. IT WILL BE
BREEZY TO LOCALLY WINDY AT TIMES IN THE AFTERNOON AND EARLY
EVENINGS. TEMPERATURES WILL BE COOL WITH 70S LOWER ELEVATIONS AND
50S/60S MOUNTAINS. HIGH MOUNTAIN VALLEYS MAY SEE THEIR FIRST FREEZE
OF THE SEASON ON SEVERAL OF THE UPCOMING NIGHTS. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  93  63  90  58 /   0   0   0   0
ALW  94  67  89  64 /   0   0   0   0
PSC  95  65  91  61 /   0   0   0   0
YKM  93  60  87  58 /   0   0   0   0
HRI  95  63  91  59 /   0   0   0   0
ELN  92  62  86  60 /   0   0   0   0
RDM  90  53  87  49 /   0   0   0   0
LGD  89  55  86  51 /   0   0   0   0
GCD  88  56  87  54 /   0   0   0   0
DLS  94  66  89  62 /   0   0   0   0

&&

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

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

$$

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