Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 011111 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
411 AM PDT MON SEP 1 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...TODAY THROUGH WEDNESDAY...A DRY NORTHWEST FLOW WILL
PREVAIL TODAY WITH SOME SLIGHT RIDGING TAKING PLACE. THIS WILL
RESULT IN WARMER TEMPERATURES AND LIGHT WINDS TODAY. AN UPPER TROUGH
WILL BEGIN TO DROP SOUTHWARD ALONG THE CANADIAN COAST WITH A DRY
COLD FRONT TONIGHT AND TUESDAY. THE COLD FRONT IS EXPECTED TO MOVE
INTO THE PACIFIC NORTHWEST DURING THE DAY TUESDAY WITH TIGHTENING
SURFACE PRESSURE GRADIENTS. AS SUCH EXPECT INCREASING WINDS ON
TUESDAY. MOISTURE WILL BE LIMITED BUT THERE WILL BE ENOUGH FOR A FEW
SHOWERS ALONG THE CASCADE EAST SLOPES BEGINNING TUESDAY AFTERNOON.
ELSEWHERE IT WILL REMAIN DRY. DESPITE THE TROUGH MOVING INTO THE
REGION TEMPERATURES WILL CONTINUE TO WARM A COUPLE MORE DEGREES TO
JUST SHY OF NORMAL HIGHS. THE MAIN CONCERN TUESDAY WILL BE THE
INCREASING WINDS AND MODERATELY LOW RELATIVE HUMIDITY WHICH WILL
CAUSE FIRE WEATHER CONCERNS. HOWEVER...AT THIS TIME THE RH`S LOOK TO
BE TOO HIGH FOR ANY RED FLAG CONDITIONS TO DEVELOP. BUT THE WIND
COULD BE A PROBLEM FOR EXISTING FIRES. THE COLD FRONT WILL MOVE TO
THE SOUTHEAST AND EXIT THE CWA TUESDAY NIGHT WITH A DRY AND STABLE
NORTHWEST FLOW BEHIND IT. THE UPPER TROUGH WILL SAG FURTHER SOUTH
ALONG THE COAST WITH SOME COOLER AIR MOVING INTO THE REGION ON
WEDNESDAY BEHIND THE COLD FRONT. THEREFORE HAVE DROPPED TEMPERATURES
ABOUT 4 TO 6 DEGREES FROM THOSE ON TUESDAY. WINDS ON WEDNESDAY WILL
BE LIGHTER ACROSS THE CWA. 88

.LONG TERM...WEDNESDAY NIGHT THROUGH SUNDAY...AN UPPER LEVEL TROUGH
WILL MOVE OUT OF THE CWA WEDNESDAY NIGHT. THIS TROUGH WILL SPLIT
WITH THE NORTHERN PORTION CONTINUING EASTWARD INTO MONTANA AND THE
SOUTHERN PORTION DROPPING SOUTH OVER NORTHERN CALIFORNIA THURSDAY.
DRIER AND MORE STABLE AIR WILL MOVE INTO EASTERN WASHINGTON AND
OREGON BEHIND THE TROUGH. SPLIT FLOW BETWEEN THE AMPLIFYING EASTERN
PACIFIC RIDGE...THE DEPARTING TROUGH...AND THE CUTOFF LOW IN
CALIFORNIA WILL REMAIN OVER EASTERN WASHINGTON AND OREGON FOR THE
REST OF THE LONG TERM PERIOD. THIS WILL KEEP DRY AND STABLE AIR OVER
THE AREA. RADIATIONAL COOLING DUE TO LIGHT WINDS...LENGTHENING
NIGHTS...AND CLEAR SKIES WILL KEEP NIGHTS COOL WHILE THE AMPLIFYING
RIDGE WILL PROVIDE SUNNY SKIES AND WARMER DAYS.  COONFIELD

&&

.AVIATION...12Z TAFS...VFR CONDITIONS WILL PREVAIL OVER THE NEXT 24
HOURS UNDER MOSTLY CLEAR SKIES. WINDS WILL BE LESS THAN 10 KNOTS
THIS MORNING AND THEN INCREASE TO 8 TO 15 KTS IN THE AFTERNOON. 76

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  77  53  79  50 /   0   0   0  10
ALW  79  55  80  53 /   0   0   0  10
PSC  81  53  82  52 /   0   0   0   0
YKM  78  51  78  48 /   0   0   0   0
HRI  79  51  81  51 /   0   0   0   0
ELN  75  52  72  49 /  10   0  10  10
RDM  77  41  78  37 /   0   0   0   0
LGD  74  45  78  44 /   0   0   0   0
GCD  76  46  80  44 /   0   0   0  10
DLS  79  55  77  53 /  10   0  10  10

&&

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

&&

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

$$

88/76/76






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