Lebanon, Oregon 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

905
FXUS66 KPQR 132140
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
240 PM PDT Tue May 13 2025

.SYNOPSIS...A broad low pressure system is shifting east of the
region but is still keeping conditions cool and unsettled,
especially across the Cascades - through early Wednesday. Expect
daytime highs in the 50s along the coast and 60s inland through
at least Thursday. A brief period of warm and dry conditions
are expected Wednesday evening through Thursday morning. Light
precipitation then returns late Thursday and continues through
the weekend.

&&

.SHORT TERM...Today through Thursday Night...Conditions this
afternoon are gradually warming and drying out as a shortwave
ridge builds over the region. A few light showers may still
linger, mostly across the Cascades, but the overall trend is
toward more stable and slightly warmer weather.

By Wednesday, expect milder temperatures - mid 60s inland and
low 50s along the coast, with mainly dry conditions. However,
models suggest the shortwave ridge will start to break down
Wednesday night into Thursday, transitioning to a weak trough
or more zonal flow.

Thursday looks slightly cooler and still mostly dry to start,
but by late in the day, weak disturbances embedded in the flow
could bring another round of light showers, continuing into
early Friday.

.LONG TERM...Friday through Tuesday...From Friday and into early
next week, a stronger low pressure system dropping down from far
western Canada will likely bring another round of light
precipitation. Rain chances return by the end of the week and
linger through the weekend. Temperatures will hold steady,
remaining close to seasonal averages. By early next week,
forecast models suggest that high pressure may begin building
over the eastern Pacific and gradually extend into the western
US, favoring a trend toward drier and more stable weather.
Still, by Tuesday, another system may track southeastward from
British Columbia, bringing the potential for renewed showers.
~Hall/42

&&

.AVIATION...Generally VFR cigs throughout the area as morning
stratus has already burnt off. The coast may occasionally see MVFR
cigs throughout the rest of Tuesday, with around a 70% chance of
intermittent MVFR cigs as marine stratus clouds pass through.
Throughout
the period, winds remain generally westerly, with gusts up to
10-15 kts possible Tuesday afternoon at all terminals.

Around 8-12z Wed, the next push of moisture slowly pushes through
the region, bringing slightly more substantial rain showers at all
terminals. At that time, high-res model guidance shows all
terminals seeing a 70-90% chance of MVFR cigs, with coastal
terminals seeing a 30-40% chance of IFR cigs or lower at that
time. This continues through 21z Wed, after which cigs trend back
towards VFR.

PDX AND APPROACHES...VFR conditions expected throughout daytime
hours. Conditions dropping to MVFR around 10-12z Wed as the next
band of moisture arrives, bringing an overcast deck and rain
showers; 80% confidence in MVFR or lower cigs. Winds generally
westerly throughout the period, with gusts up to 15 kt possible
Tuesday afternoon. /JLiu

&&

.MARINE...Surface high pressure centered west of Cape Mendocino
will continue to support increasing northwest flow, with gusts
reaching 20-25 kt over the outer waters and 15-20 kt over the
inner waters throughout the rest of today. Northwest swell at
8-10 ft at 10 seconds today, with winds and swell diminishing
tonight through Wednesday night. The Small Craft Advisory remains
in effect across the outer waters through 5 AM Wednesday, while
the inner waters are expected to see a shorter duration of
hazardous conditions from 11 AM through 11 PM today. Additionally,
a strong ebb after 6 PM this evening amidst the elevated swell
will see locally rougher seas of 9-10 ft within the Columbia River
Bar, yielding marginally hazardous conditions from 3 AM through
11 PM today.

High pressure building toward the coast will see winds and seas
slowly fall through Thursday, before a reinvigorated northwest
swell arrives with a frontal system approaching the coast on
Friday. Southwest flow ahead of the front will turn again out of
the northwest in its wake, with low (10-30%) chances of gale-force
gusts across the outer waters through the weekend. -Picard/JLiu

&&

.PQR WATCHES/WARNINGS/ADVISORIES...

OR...None.
WA...None.
PZ...Small Craft Advisory until 11 PM PDT this evening for PZZ210.

     Small Craft Advisory until 11 PM PDT this evening for
PZZ251>253.

     Small Craft Advisory until 5 AM PDT Wednesday for PZZ271>273.
&&

$$

www.weather.gov/portland

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