Springfield, Oregon 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

306
FXUS66 KPQR 042105
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
205 PM PDT Sun May 4 2025

.SYNOPSIS...Dry weather persists through much of the week, and
after one more cooler/chilly morning temperatures trend
noticeably warmer by Tuesday afternoon. Expect a slight chance
of light rain on Wednesday, mainly for our higher terrain
features, before we dry out yet again Thursday through the first
half of the weekend.

&&

.SHORT TERM...Now through Tuesday Night...High pressure will be
the dominate feature over the Pacific Northwest through early
next week facilitating completely dry conditions. That said,
headed into early Monday morning we`ll continue to see lingering
cooler N-NNE flow thanks to an upper-trough hanging up over the
Rockies. The NBM and most guidance shows only a slight
increase, if any, in low temperatures from last night(Sat night)
compared to tonight/Monday morning, so overnight temperatures
were trimmed to better match with persistence. This`ll likely
leave us with yet another night of efficient radiative cooling
due to clear skies/light winds, and allows overnight low
temperatures to bottom out in the mid 30s to near 40 for rural
locations and protected coast range/Cascade Valleys. Given the
forecasted temperatures, and what was observed last night, a
Frost Advisory was issued for the Coast Range Valleys, Cascade
foothills, Hood River Valley, and portions of the central/south
Willamette Valley mainly near the base of the foothills. It may
not be the worst idea to cover those tomatoes for one more
night if you live in a frost prone area - if saw frost last
night, you`ll likely see another round tonight! Temperatures
trend noticeably warmer Monday afternoon through at least
Tuesday. By Tuesday afternoon, 850 mb temperatures are likely to
rise to around 12-15C, allowing highs to warm back into the
80s. Confidence is high milder overnight lows Monday night into
the middle of the week will eliminate further frost concerns for
the time being. -Schuldt

.LONG TERM...Wednesday through Sunday...Midweek, the upper-
level ridge axis rapidly weakens and pushes eastward, while an
upper shortwave tracks across Washington and British Columbia
later Wednesday into Wednesday night. At this point model
agreement resolving this synoptic feature is high, but chances
for rainfall above 0.10" remain relatively low as the bulk of
forecast precipitation remains well to the north. Generally a 5%
to exceed 0.10" long the I-5 corridor and 10-20% in the Coast
Range, Willapa Hills, and Cascades. Behind the shortwave, the
region looks to remain on the upstream flank of upper-level
ridging, leading to persistent above normal temperatures through
the remainder of the workweek. With low confidence, the next
chance for rainfall may not occur until the second half of next
weekend or early that following week. The lack of rainfall over
the last few weeks has been unusual and we now have to catching
up to do in this regard. -Schuldt

&&

.AVIATION...High pressure building into the Pacific Northwest will
bring mostly clear skies and VFR conditions areawide through 00z
Tuesday. High resolution models and statistical model guidance
continue to suggest the probability for MVFR or IFR conditions
developing at any given taf site is very low (<10%). The ongoing
breezy northerly winds in the Willamette Valley and along the
coast should generally decrease between 03-06z Monday.

PDX AND APPROACHES...There is high confidence (>90%) VFR conditions
will persist through 00z Tuesday as high pressure builds into the
region. Expect north to northwesterly wind gusts up to 20 kt
through 03-06z Monday.


&&

.MARINE...High pressure over the northeast Pacific will more or
less maintain itself for much of the next week. This will
produce periods of gusty northerly winds and steeper wind
dominated seas across the waters this week. The strongest winds
and choppiest seas will generally occur across the waters off the
central coast of Oregon. Winds will generally peak in the
afternoon and evening hours, particularly across the inner waters.
Expect winds to hang on longer into the overnight hours beyond 10
NM. The odds for wind gusts of 25 to 30 kt decrease Tuesday into
Wednesday as a weak front moves into the waters before increasing
again towards the end of the work week.


&&

.PQR WATCHES/WARNINGS/ADVISORIES...

OR...Frost Advisory from midnight tonight to 7 AM PDT Monday for
     ORZ104-105-113-117-118-121-123>125.

WA...Frost Advisory from midnight tonight to 7 AM PDT Monday for
     WAZ205-208.

PZ...Small Craft Advisory until 9 PM PDT this evening for PZZ210.

     Small Craft Advisory until 3 AM PDT Monday for PZZ251>253-271.

     Small Craft Advisory until 3 AM PDT Tuesday for PZZ272-273.
&&

$$

www.weather.gov/portland

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