407
FXUS66 KPDT 012115
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
215 PM PDT Thu Oct 1 2026

.KEY MESSAGES...

- |Area of high pressure builds over the Pacific Northwest, with
  dry and calm conditions prevailing through at least the next
  couple of days.

- Temperatures continue to build and increase up to 15-25
  degrees above normal high temperatures by early next week.

- Light winds continue with diurnally driven speeds through
  peak heating hours.

&&

.DISCUSSION...
Not much activity displaying on radar or satellite currently.
Synoptic flow favors a dry and warm pattern with a ridge
currently pushing into the area. Will see the ridge continue to
amplify through the weekend and early next week over the Pacific
Northwest. As the ridge continues to build, high temperatures
will drive up to 15-25 degrees above normal on Monday (70-90%
chance) with highs in the mid to upper 80s in the lower
elevation areas. There is a 50-70% chance we can see the ridge
amplify enough to allow temperatures to reach at/above 90
degrees, especially in some of the Columbia Basin area.

As far as risk goes, HeatRisk is fairly low with a category `1`,
though guidance picks up on the possibility that we can see
areas of moderate HeatRisk develop on Monday across parts of
Central Oregon (20-40% chance) and parts of the Columbia Basin
(up to 10% chance). Though the outlook for widespread moderate
HeatRisk appears to remain small given the time of year and that
days are getting shorter as we head into winter. Guidance is in
agreement that temperatures will drop slightly over the next
day, though highs will remain in the 80s through mid next-week.

&&

.AVIATION /18Z TAFS THROUGH 18Z FRIDAY/...
VFR conditions are very likely (90% chance or higher) for all
TAF sites through the period; there is a very low (10%) chance
of VSBY reductions overnight into Friday morning at RDM, with
even lower chances elsewhere. Otherwise, predominantly FEW-BKN
cirrus will overspread the Pacific Northwest for the next 24
hrs, with low confidence (30% or less) in some periodic mid-
level stratus. Winds will be light and diurnally/terrain driven
through the period.

&&

.Preliminary Point Temps/PoPs...
PDT  47  78  47  79 /   0   0   0   0
ALW  53  79  52  82 /   0   0   0   0
PSC  47  81  49  82 /   0   0   0   0
YKM  50  80  50  79 /   0   0   0   0
HRI  48  81  50  80 /   0   0   0   0
ELN  45  75  46  75 /   0   0   0   0
RDM  42  81  42  81 /   0   0   0   0
LGD  48  81  47  82 /   0   0   0   0
GCD  47  82  47  88 /   0   0   0   0
DLS  54  83  53  83 /   0   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
WA...None.
OR...None.

&&

$$

DISCUSSION...95
AVIATION...86

NWS PDT Office Area Forecast Discussion