000 FXUS66 KPDT 120531 AAA AFDPDT AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PENDLETON OR 1032 PM PDT SUN MAY 11 2008 UPDATED AVIATION DISCUSSION .UPDATE...BREEZY CONDITIONS CONTINUE THIS EVENING ACROSS PORTIONS OF THE COLUMBIA BASIN AND SURROUNDING VALLEYS AND FOOTHILLS. THESE WINDS ARE EXPECTED TO DECREASE AFTER SUNSET. RADAR INDICATES ISOLATED TO SCATTERED LIGHT SHOWERS OVER THE BLUE MOUNTAINS AND EASTWARD. THESE SHOWERS WILL DISSIPATE OVERNIGHT AS HIGH PRESSURE THEN BUILDS INTO THE REGION. WILL UPDATE THE FORECAST LATER THIS EVENING TO REMOVE EVENING WORDING...OTHERWISE...THE FORECAST LOOKS TO BE ON TRACK. DK && .AVIATION...VFR CONDITIONS WILL CONTINUE FOR THE NEXT 24 HOURS AT ALL TAF SITES. BREEZY SURFACE WINDS WILL CONTINUE AT KDLS AND KPDT UNTIL 09Z BEFORE DECREASING OVERNIGHT. WINDS WILL BE BETWEEN 5 TO 15 KTS TOMORROW. DK && .PREV DISCUSSION... /ISSUED 200 PM PDT SUN MAY 11 2008/ SHORT TERM...TONIGHT THROUGH TUESDAY NIGHT...UPPER LEVEL TROUGH WILL BE MOVING ACROSS THE REGION TONIGHT. PARTLY CLOUDY SKIES FOR MOST LOCATIONS EXCEPT MOSTLY CLOUDY WITH ISOLATED SHOWERS OVER THE MOUNTAINS. BREEZY/WINDY CONDITIONS WILL CONTINUE THROUGH SUNSET THEN DIMINISH OVERNIGHT. STRONGEST WINDS WILL BE IN THE COLUMBIA BASIN..KITTITAS VALLEY..AND THE GORGE SOUTHWARD TO REDMOND. LOCAL GUSTS 30-40 MPH EXPECTED THROUGH ABOUT 8PM. UPPER RIDGE STARTS TO BUILD INTO THE PACIFIC NORTHWEST ON MONDAY. THIS WILL PROVIDE FAIR WEATHER WITH WARMER TEMPERATURES AND LIGHTER WINDS. INCREASING MID AND HIGH LEVEL CLOUDS MONDAY NIGHT AS WARM FRONT APPROACHES THE PAC NW. THIS FRONT WILL MOVE THROUGH ON TUESDAY/TUESDAY NIGHT WITH MOSTLY CLOUDY SKIES AND POSSIBLY SOME LIGHT RAIN. SIGNIFICANT WARM UP WILL BEGIN ON WEDNESDAY. 94 LONG TERM...WEDNESDAY THROUGH FRIDAY NIGHT...STRONG RIDGING WILL CONTINUE TO BUILD INTO THE REGION WEDNESDAY THROUGH FRIDAY. ALTHOUGH SIGNIFICANTLY DRIER AND WARMER CONDITIONS CAN BE EXPECTED...THERE IS A SLIGHT CHANCE FOR MOUNTAINS SHOWERS ON WEDNESDAY AS A WARM FRONT MOVES THROUGH THE AREA. OTHERWISE...MOSTLY CLEAR SKIES AND LIGHT WINDS WILL ALLOW THE AREA TO WARM INTO THE MID 80S BY THURSDAY...AND POSSIBLY INTO THE LOWER 90S ON FRIDAY. CALDER SATURDAY AND SUNDAY...MODELS ARE STILL STAYING PRETTY CONSISTENT ABOUT THE UPPER LEVEL RIDGE EXPECTED NEXT WEEK...GFS IS MOVING ABOUT 12 HOURS FASTER THAN THE ECMWF. SATURDAY WILL BE A BIT WARMER THAN SUNDAY AS THE RIDGE PUSHES OFF TO THE EAST SUNDAY AFTERNOON. THERE IS THE POSSIBILITY OF A MARINE PUSH OF COOLER AIR ASSOCIATED WITH A SURFACE LOW SUNDAY NIGHT...SO HAVE KEPT TEMPERATURES JUST BELOW 90 ON SATURDAY AND IN THE MID 80S FOR SUNDAY. VIRTUALLY NO POPS IN THE FORECAST PERIOD. HOWEVER THIS MARINE PUSH COULD PROVIDE SOME MOUNTAIN SHOWERS SUNDAY NIGHT. WEBER && .PRELIMINARY POINT TEMPS/POPS... PDT 38 64 40 67 / 10 10 0 10 ALW 41 63 44 66 / 10 10 0 10 PSC 40 68 42 72 / 10 10 0 10 YKM 34 66 40 65 / 0 10 0 10 HRI 38 67 40 69 / 10 10 0 10 ELN 38 63 38 61 / 10 10 0 10 RDM 24 62 32 69 / 10 10 0 10 LGD 35 59 33 63 / 20 10 0 10 GCD 33 61 36 65 / 10 10 0 10 DLS 41 66 44 66 / 10 10 0 10 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...NONE. WA...NONE. && $$ TI:GGG FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT... WWW.WEATHER.GOV/PENDLETON 84