Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
283
FXUS66 KSEW 292112
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
212 PM PDT Wed Apr 29 2026
.SYNOPSIS...
High pressure will allow for warm and dry conditions today.
Increasing clouds tomorrow as a weak, dry front will progress
through the region late Thursday into Friday for another round
of cloud cover and reduced temperatures, but high pressure
amplifies over the weekend and into early next week for more
significant warming. Onshore flow looks to resume Monday into
next week.
&&
.SHORT TERM /TONIGHT THROUGH FRIDAY NIGHT/...
Warm conditions and mostly clear skies prevail over western
Washington today. Temperatures as of 2 PM are in the upper 50s
to low 60s. Highs today should top out into the mid to upper 60s
this afternoon. Clouds will begin to increase overnight in the
early morning hours on Thursday as a dry front begins to
approach the area. This may also push the marine layer onto the
coast for a brief period Thursday morning. Lows will be warmer,
into the low to mid 40s. Despite the increased cloud cover, the
ridge axis will be overhead and should allow temperatures to
climb into the low to mid 70s across much of the interior, with
60s continuing along the Pacific coast and northern interior
coastlines. The warming trend will be stunted briefly on Friday
as cloud cover remains in place and the ridge gets pushed into
the intermountain west with an upper level trough forming just
offshore. Lows will be much warmer, in the upper 40s to near 50.
Highs in the upper 60s to low 70s.
&&
.LONG TERM /SATURDAY THROUGH WEDNESDAY/...
A clearing trend is in store for Saturday as the aforementioned
trough deepens into a closed low and moves southward towards the
Oregon and California coasts. As the low moves southward into
Sunday, ridging then redevelops to the north over southern
British Columbia, keeping skies clear and allowing temperatures
to continue to warm into the weekend. The ridge moves overhead
on Monday, and this day will have the greatest uncertainty in
temperatures as they may be curbed by increasing onshore flow.
Highs will climb to the 70s to low 80s by Sunday, and with that,
relative humidity will also be markedly lower, reaching the
20-35% range. This warmth will also being to approach moderate
HeatRisk for some locations, with a 40-80% chance of reaching
Moderate HeatRisk levels in the Cascade and Olympic valleys, and
much of the southwest interior. Temperatures will begin to
lower back into the 60s and 70s Tuesday and beyond as the ridge
begins to flatten and more robust onshore flow continues.
&&
.AVIATION...
Northerly flow aloft continues as a ridge moves across western
WA tonight into early Thursday. VFR conditions and mostly clear
skies will prevail through tonight. High clouds will begin to
move in Thursday morning as a dry front begins to approach the
area. A marine layer is forecast to develop along the Pacific
Coast, which may allow for IFR to LIFR conditions during the
early morning hours at HQM, but should erode away by 18Z Thur.
Elsewhere, VFR conditions continue with high clouds persisting
through much of the day Thursday. North winds 8 to 15 kt will
ease after sunset becoming variable to calm tonight. N/NW winds
resume again during the day Thursday at around 5 to 10 kt.
KSEA...VFR conditions through the TAF period. High clouds
increase after 15Z Thur and continue. N winds 8 to 12 kt will
decrease tonight, becoming more NE overnight before turning back
to NW during the day Thursday.
&&
.MARINE...
Broad high pressure over the coastal waters will be interrupted
briefly by a dry cold front that will traverse the area Thursday
night into early Friday. High pressure well offshore continuing
through the weekend and low pressure inland will maintain north
winds the the area. Gradients (and thus winds) will increase
Thursday night as the front moves through, as well as Saturday
and Sunday, making for slightly increased winds through
currently sustained winds look to remain below Small Craft
Advisory thresholds. An onshore push looks in store for Monday
and into Tuesday as a disturbance moves by to the south across
Oregon and northern California. Seas remain 8 ft or less through
the next 7 days.
62
&&
.HYDROLOGY...
No river flooding is expected in the next seven days.
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...None.
&&
$$
NWS SEW Office Area Forecast Discussion