Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
000
FXUS66 KSEW 061548
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
848 AM PDT Thu Aug 6 2020
.SYNOPSIS...A front will bring some light rain this morning with
showers tapering in the afternoon. Weak upper troughing will
persist over Western Washington into Saturday with a few lingering
showers. High pressure will rebuild early next week for warming
trend. An upper trough will return in the middle of next week for
cooler weather again.
&&
.SHORT TERM /TODAY THROUGH SATURDAY/...Front making steady progress
as expected with clearing already occurring over the Olympic
Peninsula. May see some convergence zone activity later this
afternoon, but drier conditions expected outside of that for the
afternoon. Forecast looks on track. No updates planned. Previous
discussion follows with updated marine and aviation portions. 27
A frontal system will move through the area this morning with a few
hours of light rain at times. Post-frontal showers will taper in the
late morning and afternoon and become mainly confined to the
mountains and a Puget Sound Convergence Zone. Highs will be several
degrees below normal today with many areas failing to reach 70
degrees. Zonal flow aloft on Friday will be followed by another weak
upper trough on Saturday. It looks mostly dry both days but there
could be a few showers here and there, especially Friday night when
a weak short wave moves through. Highs will warm a few degrees
Friday and Saturday but remain slightly below normal. Schneider
.LONG TERM /SUNDAY THROUGH WEDNESDAY/...Broad high pressure aloft
will build over the area Sunday and continue Monday for dry
weather with a warming trend. Highs should be in the lower to mid
80s for much of the central and south interior lowlands by Monday
with 70s elsewhere. The warm-up will be short-lived however as
another broad upper trough moves over the area Tuesday and
Wednesday. It looks generally dry for now but highs should cool
back to near normal. Schneider
&&
.AVIATION...Southwest flow aloft will transition northwesterly
tonight as an upper trough moves through the area. A cold front is
moving through this morning with rain mainly over the Puget Sound
and east. Showers this afternoon will mainly be over the Cascades
with convergence zone development over the central Puget Sound.
MVFR/IFR cigs as the front moves through. VFR for the afternoon with
some clouds. MVFR cigs early Friday morning. South to southwesterly
winds for most 7 to 14 knots with a few gusts to 20 knots. North
winds KPAE and possibly KBFI into this afternoon with any
convergence zone activity. JD
KSEA...MVFR this morning, with IFR possible mainly till 17z. Showers
possible this afternoon with convergence zone activity. VFR for the
afternoon. South winds 7 to 14 knots with a few gusts to 20 knots.
Lighter winds this evening. JD
&&
.MARINE...Onshore flow increasing today with a cold front moving
inland across the area. Gales are likely through the Strait of Juan
de Fuca with winds easing overnight. A second, weaker, front will
diminish over the Coastal Waters Friday night. SCA winds at times
for the Strait of Juan de Fuca through the weekend with onshore
flow. JD
&&
.HYDROLOGY...The daily hydrology discussion has ended until the
start of the next rainy season; it will only be updated as needed
until then.
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Gale Warning until 11 PM PDT this evening for Central U.S.
Waters Strait Of Juan De Fuca-East Entrance U.S. Waters
Strait Of Juan De Fuca.
Small Craft Advisory until 11 PM PDT this evening for Northern
Inland Waters Including The San Juan Islands.
Small Craft Advisory from 8 AM this morning to 11 PM PDT this
evening for Admiralty Inlet.
&&
$$
www.weather.gov/seattle
NWS SEW Office Area Forecast Discussion