000 FXUS66 KPDT 041051 AFDPDT AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PENDLETON OR 250 AM PST WED NOV 4 2009 .SHORT TERM...TODAY THROUGH THURSDAY NIGHT...A RIDGE WILL BUILD OVER EASTERN WASHINGTON AND OREGON TODAY. THE CWA WILL BE DRY WITH MILD TEMPERATURES DUE TO SUBSIDENCE ALOFT FROM THE RIDGE. UPPER LEVEL FLOW WILL BECOME SOUTHERLY TONIGHT ON THE BACKSIDE OF THE RIDGE. A FRONT WILL APPROACH THE COAST THURSDAY AFTERNOON WITH INCREASING CLOUDS...A CHANCE OF PRECIPITATION...AND SOUTHERLY WINDS AHEAD OF THE FRONT. SNOW LEVELS WILL BE HIGH...SO THE PRECIPITATION WILL BE RAIN. COONFIELD .LONG TERM...FRIDAY THROUGH WEDNESDAY...UNSETTLED WEATHER WILL BE LIKELY THROUGH THE MIDDLE OF NEXT WEEK. AS A COLD FRONT PUSHES THROUGH THE REGION ON FRIDAY...WESTERLY WINDS WILL INCREASE CAUSING BREEZY TO LOCALLY WINDY CONDITIONS ACROSS THE AREA. THE ONSHORE FLOW WILL ALSO BRING A MODERATE AMOUNT OF PRECIPITATION TO THE AREA...WITH MOST LOCATIONS RECEIVING MEASURABLE RAIN BY MIDDAY. THE LOWER COLUMBIA BASIN SHOULD BECOME RAIN-SHADOWED AND DRY OUT BY AFTERNOON...BUT ELSEWHERE ISOLATED TO SCATTERED SHOWERS WILL PERSIST THROUGH SATURDAY MORNING. FURTHERMORE...THIS STORM SYSTEM WILL DROP SNOW LEVELS TO NEAR OR BELOW 4000 FEET OVERNIGHT. AS SUCH...LIGHT SNOW SHOWERS CAN BE EXPECTED OVER CENTRAL OREGON AND THE NORTHEAST MOUNTAINS...WHILE THE EAST SLOPES OF THE CENTRAL WASHINGTON CASCADES COULD SEE SEVERAL INCHES...POSSIBLY REQUIRING THE ISSUANCE OF A WINTER WEATHER ADVISORY OR WARNING. ANOTHER WEATHER DISTURBANCE WILL MOVE INTO THE REGION ON SATURDAY AFTERNOON...BRINGING EVEN MORE RAIN AND MOUNTAIN SNOW TO THE AREA. A WEAK RIDGE WILL THEN BUILD INTO THE PACIFIC NORTHWEST FOR SUNDAY...BUT MOUNTAIN SHOWERS WILL REMAIN POSSIBLE. YET ANOTHER FRONTAL SYSTEM WILL MOVE INTO THE AREA ON MONDAY...AND LARGE SCALE TROUGHING OVER THE WESTERN UNITED STATES COULD SUPPORT SHOWERY WEATHER THROUGH WEDNESDAY. 82 && .AVIATION...12Z TAFS...HIGH CIRRUS CLOUDS WILL BE OVER THE REGION THE NEXT 24 HOURS WITH SURFACE WINDS LESS THAN 10 KTS AT ALL TAF SITES. VFR CONDITIONS WILL DOMINATE THE NEXT 24 HOURS...THOUGH PATCHY MORNING FOG IS POSSIBLE. 82 && .PRELIMINARY POINT TEMPS/POPS... PDT 50 34 60 44 / 0 0 20 30 ALW 51 34 59 46 / 0 0 20 30 PSC 51 36 56 45 / 0 0 20 20 YKM 52 36 54 39 / 0 0 20 30 HRI 50 31 58 43 / 0 0 20 20 ELN 51 29 47 38 / 0 0 30 40 RDM 60 31 56 39 / 0 0 20 50 LGD 56 33 59 44 / 0 0 10 30 GCD 63 32 60 40 / 0 0 10 40 DLS 53 38 55 45 / 0 0 40 60 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...NONE. WA...NONE. && THREAT INDEX TODAY : GREEN THURSDAY : GREEN FRIDAY : GREEN GREEN: NONE OR LIMITED NEED FOR WATCHES, WARNINGS, OR ADVISORIES. YELLOW: A FEW WATCHES, WARNINGS, OR ADVISORIES POSSIBLE OR IN EFFECT. RED: NUMEROUS WATCHES, WARNINGS, OR ADVISORIES POSSIBLE OR IN EFFECT. FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT... WWW.WEATHER.GOV/PENDLETON $$ 76/82/82