Imnaha, Oregon Weather Forecast Discussion

028
FXUS66 KPDT 012053
AFDPDT
Area Forecast Discussion
National Weather Service Pendleton OR
153 PM PDT Wed Oct 1 2025
.DISCUSSION...A line of showers embedded with isolated areas of
heavy rain continues to push to the east. Shower and rain chances
will increase going through the day, with highest chances in the
late afternoon. Increasing lapse rates coupled with vorticity will
help lift some showers to potentially produce some thunder.
Guidance shows the greatest area of thunderstorm coverage in parts
of the Eastern Mountains and the Foothills of the Southern Blue
Mountains. Greatest chance for some wetting rains (30-50% chance)
will be secluded to the Cascades/Blue Mountains. Basin areas will
receive less rain going through the day. We`ll see a dry period
overnight for most of the region, but will see precip emerge into
the late morning/early afternoon Thursday.
Looking ahead, temperatures will stay near normal for the most
part. Highs will be no higher than the low 70s for much of the
region, with mid to high 60s for the higher populated areas. Low
temperatures over the weekend in Central OR through the Wallowa`s
are forecasted to be near/at freezing. Very possible we`ll get our
season ending freeze for parts of the Wallowa`s and Central OR
once the weekend is over (55-65% chance). Will need to keep an eye
on cloud cover and wind trends, as that will effect temperature
guidance. Temperatures will be pleasant otherwise with Fall
conditions starting to take effect. For precip, a the trough will
continue to push east with the oncoming ridge taking more
influence in the forecast. Dry pattern will resume over the
weekend with small potential for fire weather concerns in the
Kittitas/Ellensburg area albeit very limited. After the trough
pushes off to the east, guidance is in agreement that a shortwave
will extend down early next week, bringing possible mountain
showers. Disagreement with the GFS/Euro stems with how far they
want to extend the shortwave, with the GFS extending the shortwave
that allows for greater chances of mountain showers. Some
uncertainty that needs to be worked out as we head into the
weekend, but plenty of time to monitor for changes in the
forecast.
&&
.AVIATION...18Z TAFs...Rain will continue to fall through the area
through out the period. A brief dry period overnight for most
sites, but will see some showers returns on the tail end of the
period. While conditions are expected to remain VFR, some
localized heavy rain could bring some brief MVFR conditions (5-15%
chance) with reduced visibility and/or low ceilings 

NWS PDT Office Area Forecast Discussion