000 FXUS66 KPDT 301551 AFDPDT AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PENDLETON OR 850 AM PDT MON JUL 30 2007 .SHORT TERM...UPPER LEVEL TROUGH WILL PASS THROUGH BRITISH COLUMBIA TODAY AND EXIT ON TUESDAY. THIS WILL KEEP A SOUTHWEST TO WESTERLY FLOW OVER THE FORECAST AREA TODAY. ONLY MOISTURE TO SPEAK OF WILL BE SOME MID LEVEL MOISTURE CLIPPING EASTERN OREGON NEAR THE IDAHO BORDER...OTHERWISE SUNNY SKIES. LOCALLY BREEZY CONDITIONS WILL CONTINUE ALONG THE EAST SLOPES OF THE CASCADES AS SOME MARINE AIR CONTINUES TO PUSH INLAND AS A RESULT OF THE TROUGH PASSING TO THE NORTH. GREAT BASIN HIGH WILL PUSH BACK INTO EASTERN OREGON ON WEDNESDAY AND THURSDAY FOR INCREASING TEMPERATURES AND SOME POSSIBLE THUNDERSTORMS. WILL LOOK AT THUNDERSTORM POTENTIAL A LITTLE CLOSER DURING TODAYS MODEL ANALYSIS. NO CHANGES PLANNED FOR THE FORECAST TODAY. JS && .PREV DISCUSSION... /ISSUED 230 AM PDT MON JUL 30 2007/ SHORT TERM...TODAY THROUGH WEDNESDAY. AN UPPER LOW CURRENTLY LOCATED OVER THE QUEEN CHARLOTTE ISLANDS WILL TRACK EAST ACROSS BRITISH COLUMBIA TODAY. THE BOTTOM OF THE TROUGH WILL SWEEP ACROSS WA/OR. THE ONLY EFFECT FOR OUR FORECAST AREA WILL BE CONTINUED BREEZY TO WINDY CONDITIONS IN THE COLUMBIA BASIN AND SURROUNDING VALLEYS ALONG WITH COOLER AIR SPREADING EAST OF THE CASCADES. IT WILL BE A PLEASANT DAY FOR OUTDOOR ACTIVITIES...AS AFTERNOON TEMPERATURES WILL MAINLY BE IN THE UPPER 70S TO UPPER 80S WITH MOSTLY SUNNY SKIES. IT WILL BE WINDY AGAIN TODAY IN THE KITTITAS VALLEY AND THE EASTERN COLUMBIA RIVER GORGE. A WEAK WESTERLY FLOW ON TUESDAY WILL KEEP DRY CONDITIONS OVER THE REGION WITH TEMPERATURES INCREASING A FEW DEGREES COMPARED TO TODAY. SUSTAINED WINDS WILL GENERALLY RANGE FROM 10-20 MPH. ON WEDNESDAY...AN UPPER LOW OFF THE CALIFORNIA COAST WILL SEND SOME MID LEVEL MOISTURE INTO SOUTHERN OREGON. THE AIR MASS IS MARGINALLY UNSTABLE. IT WAS TEMPTING TO REMOVE THE SLIGHT CHANCE OF THUNDERSTORMS CURRENTLY IN THE GRIDDED FORECAST FOR THE ALDRICH AND STRAWBERRY MTNS FOR WED AFTERNOON BUT WILL HOLD OFF AND SEE WHAT THE NEXT MODEL RUN HAS IN STORE. SMITH LONG TERM...WEDNESDAY NIGHT THROUGH SUNDAY. LIMITED MOISTURE AND INSTABILITY WILL LINGER OVER THE FAR SOUTH PORTION OF THE AREA ON WEDNESDAY NIGHT WITH A BETTER CHANCE OF THUNDERSTORMS OVER THE BLUE MOUNTAINS ON THURSDAY AS THE AREA OF MOISTURE AND INSTABILITY IS PUSHED A LITTLE FURTHER NORTH. FOR FRIDAY THROUGH SUNDAY...THE EXTENDED MODELS ARE COMING INTO BETTER AGREEMENT WITH A TROUGH OVER THE PACIFIC NORTHWEST THROUGH THE WEEKEND WITH A NICE COOLING TREND FOR EARLY AUGUST. ML AVIATION...VFR CONDITIONS WILL PREVAIL FOR THE NEXT 24 HOURS AT ALL TAF SITES AND ALONG TWEB ROUTES. BREEZY SURFACE WINDS WITH GUSTS TO 25 KTS AT KDLS WILL CONTINUE OVERNIGHT THROUGH MUCH OF DAY ON MONDAY. ML && .PRELIMINARY POINT TEMPS/POPS... PDT 87 57 89 57 / 0 0 0 0 ALW 90 59 91 61 / 0 0 0 0 PSC 91 61 91 60 / 0 0 0 0 YKM 88 57 90 57 / 0 0 0 0 HRI 90 60 92 56 / 0 0 0 0 ELN 81 58 86 56 / 0 0 0 0 RDM 86 44 89 49 / 0 0 0 0 LGD 88 56 90 55 / 0 0 0 0 GCD 89 55 93 55 / 0 0 0 0 DLS 84 59 91 60 / 0 0 0 0 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...NONE. WA...NONE. && $$ TI:GGG FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT... WWW.WEATHER.GOV/PENDLETON 91/76/76