Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 182101
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
201 PM PDT THU SEP 18 2014

.SHORT TERM...TONIGHT THROUGH SUNDAY...UPPER LEVEL TROUGH OFF THE
NORTHERN CALIFORNIA COAST WILL CONTINUE TO MAKE ITS WAY DOWN THE
COAST TONIGHT.  MARGINAL SHOWER ACTIVITY WILL CONTINUE THROUGH THE
EVENING...WITH A SLIGHT CHANCE OF THUNDER BEFORE 8 PM ALONG CENTRAL
OREGON AND THE NORTHEAST MOUNTAINS.  SPLIT FLOW WILL DOMINATE
THEREAFTER AND EXPECT MOSTLY DRY CONDITIONS TO PREVAIL...UPSLOPE
SHOWERS ALONG THE NORTHEAST MOUNTAINS...AND SPILL OVER SHOWERS ALONG
THE CASCADES WILL BE POSSIBLE...BUT DO NOT ANTICIPATE MUCH IN
MEASURABLE PRECIPITATION. WINDS WILL STILL BE A BIT BREEZY THROUGH
ABOUT MIDNIGHT...BEFORE DIMINISHING THEREAFTER.  BY TOMORROW DRY
NORTHWEST FLOW CAN BE EXPECTED WITH THE BUILDING UPPER LEVEL RIDGE.
THE WEEKEND WILL BE WARM AND DRY WITH HIGHS IN THE 80S TO POSSIBLY
LOWER 90S ACROSS THE LOWER ELEVATIONS.  CLOUD COVER SHOULD BE
MINIMAL AS WELL.  THIS MAY BE THE LAST WEEKEND OF THIS HOT
SUMMERLIKE WEATHER AS THERE LOOKS TO BE SOME CHANGES COMING IN THE
EXTENDED.  WEBER

.LONG TERM...FORECAST AREA WILL BE UNDER THE INFLUENCE OF A RIDGE OF
HIGH PRESSURE SUNDAY NIGHT AND MONDAY AND A LARGE TROUGH OF LOW
PRESSURE OFF THE COAST. THE TROUGH WILL SEND A SACRIFICIAL COLD
FRONT AGAINST THE RIDGE LATE MONDAY SPREADING CLOUDS INTO THE
REGION. THIS WILL BE THE BEGINNING OF THE END FOR THE RIDGE AS OVER
THE NEXT COUPLE OF DAYS THE TROUGH BEGINS TO ADVANCE EASTWARD INTO
THE PACIFIC NORTHWEST. INCREASING SOUTHWESTERLY FLOW TUESDAY WILL
LEAD TO A SLIGHT CHANCE OF THUNDERSTORMS OVER THE EASTERN MOUNTAINS
FOLLOWED BY A STRONGER COLD FRONT TUESDAY NIGHT AND WEDNESDAY. THEN
THE UPPER LEVEL TROUGH WILL SETTLE OVER THE REGION WEDNESDAY AND
THURSDAY. THIS SYSTEM WILL HAVE THE POTENTIAL TO BRING THE FIRST
GOOD FALL PRECIPITATION EVENT TO THE FORECAST AREA AS WELL AS BRING
BACK THE MUCH COOLER TEMPERATURES.

&&

.AVIATION...00Z TAFS...VFR CONDITIONS ARE EXPECTED TO PERSIST
THROUGH THE NEXT 24 HOURS. THERE MAY BE SOME LIGHT SHOWERS AROUND
THE REGION THROUGH THIS EVENING AND PERHAPS AN ISOLATED
THUNDERSTORM...THEN PARTIAL CLEARING OVERNIGHT. WESTERLY WINDS OF 10
TO 20 MPH WILL DECREASE OVERNIGHT BECOMING LESS THAN 10 MPH.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  55  78  53  84 /  10   0   0   0
ALW  61  79  59  86 /  10   0   0   0
PSC  57  82  54  87 /  10   0   0   0
YKM  56  79  52  84 /  10   0   0   0
HRI  55  81  51  86 /  10   0   0   0
ELN  57  78  50  84 /  10   0   0   0
RDM  43  76  43  84 /  20   0   0   0
LGD  51  76  47  84 /  10  10   0   0
GCD  49  76  48  86 /  10   0   0   0
DLS  58  80  56  89 /  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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