606 FXUS66 KPDT 082034 AFDPDTArea Forecast Discussion National Weather Service Pendleton OR 134 PM PDT Mon Sep 8 2025
.DISCUSSION... An upper low, currently off the coast of northern California and southern Oregon will move onshore tonight into early Tuesday. This low and trough associated with it remain over the western states through much of the upcoming week before moving eastward Friday night into Saturday. Transient ridging will move over the area for Saturday before another trough possibly impacts the region early next week.
With the upper low and trough, conditions look to be unsettled for much of the week. Thunderstorm chances are highest today through Wednesday, with highest chances today over central Oregon then across the higher elevations of central and eastern Oregon Tuesday and then the chances shift east on Wednesday to mainly eastern Oregon. However, by Wednesday, overall POPS increase as well with some areas seeing likely or higher chances.
QPF values are fairly low today and Tuesday, mainly due to the nature of thunderstorms. However, by Wednesday, rain becomes more widespread and amounts, especially for the higher terrain from central Oregon to eastern Oregon will increase. Some of these areas will see QPF between 0.50 to 1.00 inch.
THE ECMWF EFI does focus in on some anomalous QPF values on Tuesday, in central Oregon, with values in the 0.7 to 0.8 range and on Wednesday the 0.7 to 0.8 range is a bit more widespread.
High temperatures will be around or slightly below normal through the week.
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.AVIATION... 18Z TAFS...VFR conditions are generally expected. TSRA are possible this afternoon and evening, mainly at BDN and RDM. Due to inconsistencies on timing, have opted to not include at this time.
Otherwise, RA will develop at BDN and RDM late this afternoon and continue this evening and develop everywhere else during Tuesday morning (except at PSC). Winds will generally be 10 kts or less, outside of any TSRA. However, DLS will have some gusty winds between 25 and 30 kts this afternoon.
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.PRELIMINARY POINT TEMPS/POPS... PDT 83 57 80 56 / 20 40 40 40 ALW 85 60 80 59 / 10 40 40 40 PSC 87 58 82 57 / 10 40 40 30 YKM 83 59 80 56 / 10 40 60 30 HRI 87 58 83 57 / 10 50 40 30 ELN 81 55 79 53 / 10 40 70 40 RDM 77 49 72 47 / 70 70 80 50 LGD 80 50 77 52 / 30 30 50 50 GCD 80 50 77 50 / 20 20 50 40 DLS 82 62 80 60 / 20 70 60 30
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.PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. &&
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SHORT TERM...77 LONG TERM....77 AVIATION...77
NWS PDT Office Area Forecast Discussion