Area Forecast Discussion
Issued by NWS Pendleton, OR
Issued by NWS Pendleton, OR
427 FXUS66 KPDT 262335 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 435 PM PDT Thu Jun 26 2025 .Updated for Aviation... SHORT TERM...today through Sunday morning...Satellite shows stratus entering from the WA Cascade and into the region. With a shortwave passing through the PacNW, chances of PoP across the WA Cascades increase through the afternoon and early evening hours. Precip may extend close to the Yakima/Ellensburg area during the late afternoon/early evening (>80% chance). Nothing to suggest any thunder will be associated with these storms. Weather will clear by the early morning hours of Friday with a ridge starting to push through the area. Temperatures will slow rise through the short term as the pattern begins to favor a warming trend from the short term that will last through the long term. Winds will be breezy across the Basin with general diurnal winds through the next few days. Strongest winds will be today through Friday, with most places capping their gusts at 20-30 knots. LONG TERM...Sunday morning through Thursday...The long term is more animated than the short term, with a ridge setting up for a potential heat wave during the holiday week coupled with potential of thunderstorms in Central OR. Ridging will start moving through the region over the weekend, setting up a pattern for temperatures to begin a warming trend over the weekend. High temperatures will tapper off in the mid 90s for much of the Basin plus Central OR/Kittitas Valleys. Monday appears to be the hottest day with NBM delivering triple digits for the Columbia Basin and creeping into the Kittitas. NBM currently advertises 40-60% chances of temperatures exceeding 100 degrees in the Tri-Cities area, among other portions of the WA Columbia Basin. Heat advisories might need to be considered for the Columbia Basin/Gorge as preliminary Heat Risk values are >3 for the Mon-Tues timeframe. Any advisories needed or added will be assessed and decided through the next few days if they are still warranted. A break in the ridge with a shortwave will push down through the region Monday, allowing for some moisture advection (coupled with the daytime heating) to bring chances of thunderstorms across Central OR and across large parts of the Blues. The highest chance for thunderstorm development will be the early afternoon through evening hours of Monday. Chances decrease vastly as we head into Tuesday, with remnant showers lingering across the southern part of the region. Things become a bit less confident heading into Wednesday, as things naturally become less clear this far out. Members are completely split Tuesday going into Wednesday onwards how strong it will make the trough behind the ridge. Looking at meteograms confirms that temperatures wildly fluctuate around this same time frame. AVIATION... 00Z TAFS...VFR conditions are expected through the TAF period. Wind gusts around 20 to 25 kts are occurring at all sites, at least periodically and 25 to 30 kts at DLS. These gusts will decrease this evening or overnight to 10 kts or less. Wind gusts will increase Friday afternoon generally in the 20 to 25 kt range. .PRELIMINARY POINT TEMPS/POPS... PDT 56 83 56 85 / 10 0 0 0 ALW 60 82 59 84 / 10 0 0 0 PSC 58 86 57 87 / 10 0 0 0 YKM 54 81 54 86 / 10 0 0 0 HRI 58 86 56 87 / 10 0 0 0 ELN 54 78 54 81 / 20 0 0 0 RDM 45 80 44 84 / 0 0 0 0 LGD 51 78 50 80 / 10 0 0 0 GCD 50 82 49 83 / 10 0 0 0 DLS 58 80 57 86 / 10 0 0 0 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. && $$ SHORT TERM...95 LONG TERM....95 AVIATION...77