Area Forecast Discussion
Issued by NWS Pendleton, OR
Issued by NWS Pendleton, OR
160 FXUS66 KPDT 172310 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 410 PM PDT Tue Jun 17 2025 Updated Aviation Discussion .AVIATION...00z TAFs...VFR conditions expected for the period. Skies will remain mostly clear with W/NW winds around 10 kts gusting up to 25 kts at some sites. Winds will back down overnight tonight at less than 10 kts, before picking up tomorrow afternoon with gusts back up to 30 kts, especially for PDT and DLS. Evans/74 && .PREV DISCUSSION... /issued 1256 PM PDT Tue Jun 17 2025/ SHORT TERM...Today through Friday morning...Current satellite and radar depict clear weather conditions for the area, with a few high clouds over the Tri-Cities and to the area just north of it. Not anticipating this dry pattern to change for the next couple of days. Our only chance (45-65% chance) of some precip in the short term will be in the Central WA Cascade region Wed AM through the afternoon, as a cut-off low just off the Gulf of Alaska moves into the PacNW. As that system makes its way into the region, both pressure gradient and temperature gradient will become more compact, causing gusty winds across the Cascade gaps and near the Kittitas Valley. NBM advertises 55-65% chances, with some very locally >85% spots, of wind advisory criteria gusts. Not enough confidence to show this will come into fruition and/or spread through enough coverage area to warrant an advisory at this time. Will continue to monitor as winds will be breezy to locally windy throughout the next couple of days. LONG TERM...Friday morning through Tuesday...For the long run, the trough that continues to push SW flow into the region from earlier will define the active weather pattern ahead. First, min RH values will greatly recover by the end of this week, reducing Red Flag Warning threats for the second half of this week. Min RH`s currently stand in the mid to high end teens but by the end of the week, they should rise to the 30s to 40s percentage wise. This is again thanks in due to the pure SW flow from the incoming system bringing in some maritime air, temporarily relieving the region of dry air. Heading into the weekend, members are pretty clear that the region will be impacted by widespread light rain with the oncoming system (>85% chance). The models start to have slight disagreements how they would conclude the system by the end of the period. EURO ensembles suggest the cut-off low will continue to push to the NE into Canada, becoming more broad while barely maintaining its cut-off features while the GFS ensembles will transition the system into a more broad wave. Temperatures at this point depends on which solution reality more favors, with the EURO (GFS) solution favoring a cooler (warmer) forecast. && .PRELIMINARY POINT TEMPS/POPS... PDT 54 84 50 78 / 0 0 0 0 ALW 59 84 53 78 / 0 0 0 0 PSC 55 87 50 81 / 0 0 0 0 YKM 54 83 49 82 / 0 0 0 0 HRI 56 86 50 80 / 0 0 0 0 ELN 53 78 48 78 / 0 0 0 0 RDM 43 81 39 75 / 0 0 0 0 LGD 50 84 48 77 / 0 0 0 0 GCD 48 88 46 80 / 0 0 0 0 DLS 57 77 51 78 / 0 0 0 0 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. && $$ SHORT TERM...95 LONG TERM....95 AVIATION...74