Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 030547 AAB
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1040 PM PDT TUE SEP 2 2014

UPDATED THE AVIATION DISCUSSION

.UPDATE...SOME SHOWERS WERE MAKING THERE WAY ACROSS THE CASCADES AND
INTO PORTIONS OF THE KITTITAS AND YAKIMA VALLEYS AND HAVE UPDATED
THE ZONES TO INCLUDE ISOLD RA THIS EVENING. OTHERWISE DUE TO
IMPROVING RH THE RFW WAS ALLOWED TO EXPIRE. ALSO SOME BRIEF WIND
GUSTS AROUND 45 MPH COULD DEVELOP IN AND NEAR SHOWERS. OTHERWISE THE
PRESENT SHORT TERM FORECAST APPEARS ON TRACK FOR NOW.

.AVIATION...BREEZY WEST TO NORTHWEST WINDS WILL PERSIST ACROSS MOST
TAF SITES BEFORE LESSENING AFTER 10Z. OTHERWISE MAINLY VFR
CONDITIONS CAN BE EXPECTED THROUGH WEDNESDAY.

&&

.PREV DISC... /ISSUED 735 PM PDT TUE SEP 2 2014/

UPDATE...SURFACE WINDS CONTINUE TO BE BREEZY ACROSS THE BASIN THIS
EVENING AS A DISTURBANCE TIGHTENS PRESSURE GRADIENTS AND TRACKS TO
OUR NORTH BRINGING COOLER TEMPERATURES. THE WINDS SHOULD PERSIST FOR
A FEW MORE HOURS BEFORE LESSENING AS THE DISTURBANCES MOVES EAST.
OTHERWISE A STRONGER BAND OF SHOWERS WERE NEARING OUR WASHINGTON
CASCADES WHICH COULD PRODUCE A CLAP OF THUNDER AROUND THE EASTON AND
CLE ELUM AREAS THIS EVENING AND HAVE UPDATED THE ZONES TO REFLECT
THIS. OTHERWISE A WIND ADVISORY REMAINS IN EFFECT UNTIL 9 PM AROUND
THE ELN AREA AND THE PRESENT SHORT TERM FORECAST APPEARS ON TRACK
FOR NOW.

PREV DISC... /ISSUED 442 PM PDT TUE SEP 2 2014/

SHORT TERM...TONIGHT THROUGH FRIDAY...A SYSTEM OUT OF THE GULF OF
ALASKA WILL CONTINUE TO SWING ACROSS BRITISH COLUMBIA AND NORTHERN
WASHINGTON TONIGHT. THIS SYSTEM WILL PUSH A COLD FRONT ACROSS THE
REGION LATE THIS AFTERNOON AND THIS EVENING. MOISTURE WITH THIS
SYSTEM IS LIMITED AND WILL CONTINUE TO MENTION VARYING CHANCES OF
PRECIP OVER THE WASHINGTON CASCADE EAST SLOPES THROUGH TONIGHT. WILL
ALSO CONTINUE TO MENTION A FEW SHOWERS IN THE NORTHERN BLUE
MOUNTAINS DUE TO UPSLOPE AFFECTS TONIGHT AND WEDNESDAY MORNING.
WINDS WILL CONTINUE TO INCREASE THIS AFTERNOON DUE TO THE FRONT. THE
STRONGEST WINDS WILL BE ACROSS THE KITTITAS VALLEY AND WILL CONTINUE
THE WIND ADVISORY. BREEZY TO WINDY CONDITIONS WILL OCCUR ELSEWHERE,
ESPECIALLY ACROSS THE BASIN AND IN THE COLUMBIA RIVER GORGE. STILL
EXPECT SOME PATCHY BLOWING DUST NEAR OPEN FIELDS OVER PORTIONS OF
THE BASIN INTO EARLY EVENING. UNCERTAINTY REMAINS AS TO HOW THE
WINDS WILL INTERACT WITH THESE OPEN FIELDS, SO WILL CONTINUE TO
MONITOR FOR POSSIBLE LOWER VISIBILITIES IN THE BLOWING DUST. THE
LATEST SYSTEM WILL CONTINUE TO SWING EAST ACROSS MONTANA WEDNESDAY.
THIS WILL LEAD TO SKIES CLEARING FROM THE SOUTHWEST THROUGH THE DAY.
ALSO ANY LINGERING PRECIP CHANCES WILL END BY AFTERNOON. HIGH TEMPS
WILL BE UP TO 10 DEGREES COOLER THAN TODAY. A MAINLY DRY NORTHWEST
TO NORTH FLOW WILL PERSIST OVER THE REGION THURSDAY INTO FRIDAY.
THUS EXPECT FAIR AND DRY CONDITIONS WITH MOSTLY SUNNY DAYS. HIGH
TEMPS WILL GRADUALLY WARM EACH DAY REACHING TO THE MID 80S OVER THE
COLUMBIA BASIN ON FRIDAY. 90

LONG TERM...FRIDAY NIGHT THROUGH TUESDAY...MODELS SHOW OUR AREA
UNDER A RIDGE FRIDAY NIGHT AND SATURDAY WITH A WEAK CLOSED LOW OFF
OF NORTHERN CALIFORNIA. SEE LITTLE CHANCE OF ANY PRECIPITATION AS
HIGH PRESSURE WILL DOMINATE. UPPER FLOW WILL TURN FROM NORTHWEST TO
NORTHEAST AND GIVE US GENERALLY LIGHT NORTHEAST WINDS SATURDAY.
MODELS ALSO SHOW A TROUGH APPROACHING THE AREA ON SUNDAY AND MOVING
INTO THE AREA SUNDAY NIGHT OR MONDAY. THERE IS NOT A LOT OF MOISTURE
WITH THIS SYSTEM BUT EXPECT A SLIGHT CHANCE OF SHOWERS MAINLY ALONG
THE CASCADES AND PERHAPS ALONG THE HIGHER MOUNTAINS OF EASTERN
OREGON ON MONDAY. THE TROUGH MOVES OFF TO THE EAST MONDAY NIGHT AND
A NORTHWEST FLOW WILL CONTINUE OVER THE AREA AS A RIDGE REFORMS OUT
IN THE EASTERN PACIFIC. HAVE KEPT A SLIGHT CHANCE OF UPSLOPE SHOWERS
IN THE CASCADES AND THE HIGHER EASTERN OREGON MOUNTAINS MONDAY
THROUGH TUESDAY. TEMPERATURES WILL BE IN THE 80S WITH MID 70S TO
LOWER 80S IN THE MOUNTAINS SATURDAY AND SUNDAY THEN COOL TO THE 70S
TO LOWER 80S WITH 70S MONDAY AND TUESDAY. PERRY

FIRE WX...A DRY COLD FRONT WILL PUSH ACROSS THE INTERIOR PACIFIC
NORTHWEST THIS AFTERNOON AND EVENING. EXPECT WINDS 20 TO 25 MPH
ACROSS OR/WA 641...THIS IN COMBINATION WITH LOW RELATIVE HUMIDITIES
WILL CREATE CRITICAL FIRE WEATHER CONDITIONS. A RED FLAG WARNING
WILL CONTINUE THROUGH 8 PM THIS EVENING FOR THESE ZONES. ALL OTHER
AREAS CAN EXPECT 10 TO 20 MPH WINDS...BUT RELATIVE HUMIDITIES ARE
NOT EXPECT TO BE LOW ENOUGH FOR CRITICAL FIRE WEATHER CONDITIONS. 89

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  50  73  47  78 /  10   0   0   0
ALW  54  73  52  79 /  10  10   0   0
PSC  54  77  46  80 /  10   0   0   0
YKM  46  75  44  78 /  20   0   0   0
HRI  52  77  44  80 /  10   0   0   0
ELN  52  75  44  80 /  20   0   0   0
RDM  35  72  33  77 /   0   0   0   0
LGD  45  69  39  75 /  10  10   0   0
GCD  42  72  38  77 /  10   0   0   0
DLS  55  76  49  85 /  10   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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