Area Forecast Discussion
Issued by NWS Pendleton, OR

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715
FXUS66 KPDT 250300
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
800 PM PDT Tue Jun 24 2025

.EVENING UPDATE...A cluster of showers and thunderstorms is
currently rolling through central Oregon this evening, having
already dropped a wetting rain over portions of Deschutes County.
Based on radar returns, however, these showers appear to be losing
steam as they start running into the much drier air mass currently
prevailing over eastern Oregon. Clouds are also starting to nudge
their way into the forecast area ahead of tomorrow`s system, which
should work to cut off any remaining instability fueling these
showers.

Only change made to the forecast was to update PoPs for central
Oregon, as the forecast had previously called for dry conditions.
Could see a similar shower/storm threat, with models picking up
little to no activity, tomorrow for the eastern mountains as well.
Evans/74

&&

.PREV DISCUSSION... /issued 424 PM PDT Tue Jun 24 2025/

SHORT TERM...Today through Thursday...Today is the warmest day
of this term with temperatures in the 80s and 90s across central
OR extending to the Columbia Basin, but will slightly decrease by
few degrees tomorrow through Thursday into the 70s and 80s. RH
values continues dropping to the teens tonight across the
aforementioned areas before recovering tomorrow into Thursday as
well up to the 20s or higher. Heat Risk will remain moderate
(level 2 of 4) over the Columbia Basin today due to the low RHs
and warming temps, though with no concerns for critical conditions
at this time. Otherwise, this forecast period will be warm and
dry.

No precip is expected today, but may develop over the WA Cascades
(30-60% probability) and Wallowas tomorrow with less than 0.10
inches (30-40% prob). And with the southwest flow across the eastern
mountains, isolated thunderstorms could form mainly over the
Wallowas Wednesday evening, given the SPC Outlook having this
area in marginal risk. Although CAPE values may increase up to 800
J/Kg, instability remains weak with lack of moisture support
(<20% confidence).

With the strong pressure gradients, breezy conditions (15-25 mph)
are expected for this term across the Cascade Gaps and the Columbia
Basin. The raw ensembles favor a 30-60% prob for gusts reaching to
30-35 mph over the Columbia River Gorge Wednesday afternoon into
evening. Thursday should be relatively breezy from the westerly
flow, though might become slightly gusty up to 30 mph Thursday night
(30-40% confidence). Feaster/97

LONG TERM...Friday through Tuesday...Warm, dry conditions will
prevail for the duration of this period. Temperatures will
continue trending upward into next week with RHs gradually
decreasing under 30s Friday and then into the teens over the
weekend onwards for most locations. Sunday through Tuesday will be
our warmest and driest days of next week with temperatures
reaching up to the 90s and higher. Monday and Tuesday, however,
could reach into the low 100s across the Columbia Basin (>40%
confidence). Heat Risk will be moderate across most of the
forecast area Sunday into Tuesday, but with portions of the
Columbia Basin remaining in pockets of Major Heat Risk Monday and
Tuesday.

The Gorge may be slightly gusty Friday afternoon at 30 mph.
Otherwise, winds will be light with occasional breezes Friday night
onwards. Feaster/97

AVIATION...00Z TAFs...VFR conditions to prevail through the
period. Winds 12-15kts with gusts to around 25kts will impacts
sites DLS/RDM/BDN with light winds elsewhere this afternoon, with
light winds returning to breezy sites late this evening. Tomorrow,
winds 12-20kts with gusts 20-30kts will develop at sites
DLS/PDT/ALW/PSC after 16Z and persist into the late afternoon and
evening. Lawhorn/82

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  61  87  57  81 /   0   0   0   0
ALW  66  86  60  81 /   0   0   0   0
PSC  63  90  58  84 /   0   0   0   0
YKM  59  87  55  81 /  10   0   0   0
HRI  63  88  58  83 /  10   0   0   0
ELN  58  81  55  76 /  10   0   0   0
RDM  48  82  45  78 /  20   0   0   0
LGD  56  83  53  79 /   0  10  10   0
GCD  53  85  52  82 /  20  10   0   0
DLS  61  80  58  77 /   0   0   0   0

&&

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

$$

UPDATE...74
SHORT TERM...97
LONG TERM....97
AVIATION...82