626
FXUS66 KPQR 162208 CCA
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
300 PM PDT Wed Apr 16 2025

.SYNOPSIS...High pressure will allow dry conditions and above
normal temperatures to persist through the end of the work week as
our stretch of pleasant weather continues. A series of disturbances
will bring closer to average temperatures for the weekend and into
early next week along with a chance for light showers.

&&

.SHORT TERM...Now through Friday Night...Benign conditions
continue across the region as with above average temperatures
through the remainder of the work week. A short wave passing east of
the Cascades is supporting N/NW flow aloft but will shift eastward
overnight, allowing for an amplified ridge to move onshore across
the West Coast and PacNW. A thermal across northern California and
southern Oregon is expected to build northward, supported by the
ridge and aiding in the warm temps to end the week. Thursday temps
are expected to warm into the upper 60s to low 70s inland and low to
mid 60s along the coast. Probabilities for temps above 70 inland
range from 40-80%, highest around the Portland metro. Friday will be
even warmer inland with temps in the mid to upper 70s with temps
similar to Thursday along the coast. Probabilities for reaching 70
inland are greater than 70% and range from 20-40% in the Willamette
Valley except around the Portland metro with probs much higher with
a 50-70% chance. Temps on Thursday and Friday should be around 5
degrees above average along the coast and around 10-15 degrees above
average inland.

Winds start out with weak onshore flow but are expected to turn
offshore overnight as the thermal low builds northward. Expect
northerly to northwesterly winds in the lowland and easterly
downslope winds on the west side of the Cascades and Coast Range.
                                                          -Batz

&&

.LONG TERM...Saturday through Tuesday...The pattern shifts as we
move  into the weekend. A series of short wave disturbances are
expected to move across the region shifting the short wave ridge
east of the Cascades. Significant precipitation is not expected
through the weekend but light showers are possible, mainly along the
north OR/south WA coasts and north of the Portland metro.
Accumulations of a few hundredths will be possible. Temperatures
drop close to normal, possible a degree or two below normal for the
weekend and into early next week.    -Batz

&&

.AVIATION...VFR conditions under mostly clear skies prevail
through the TAF period as high pressure dominates the region.
Northwesterly winds across all terminals through this evening with
gusts up to 25 kt along the central Oregon coast.

Tonight after 06z Thu, a thermal trough will set-up along the coast
leading to easterly winds. This offshore wind will bring drier  air
and make it difficult for low stratus to form. In addition, an upper
level low dropping into eastern WA/OR will bring in more easterly
winds aloft, especially between FL010 to FL020. This could lead to
LLWS impacts for Valley terminals as light northerly surface winds
prevail.

PDX AND APPROACHES...VFR through the TAF period. Northwesterly winds
around 5-10 kt through this evening. Tonight into early Thursday
morning, could see impacts due to increasing LLWS as easterly winds
between FL010 to FL020 strengthen due to an upper level low dropping
down in eastern OR/WA. After 15-18z Thu, weakening easterly winds
aloft will help reduce LLWS impacts.          -Alviz

&&

.MARINE...A thermal trough developing along the coast tonight will
lead to northeasterly winds across the waters around 10-15 kt. The
currently Small Craft Advisory is expected to drop for most marine
zones late this evening as winds weaken and seas gradually fall. An
exception would be zone PZZ273, where pressure gradients will be
tight enough to support northeasterly wind gusts up to 25 kt through
early Thursday morning. Seas around 8-10 ft at 12 seconds will fall
to 6-7 ft at 11 seconds by Thursday evening. High pressure offshore
will maintain northerly to northwesterly winds through early next
week.       -Alviz

&&

.PQR WATCHES/WARNINGS/ADVISORIES...

OR...None.
WA...None.
PZ...Small Craft Advisory until 11 PM PDT this evening for
     PZZ251>253-271-272.

     Small Craft Advisory until 8 AM PDT Thursday for PZZ273.
&&

$$

www.weather.gov/portland

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