550
FXUS66 KSEW 220910
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
210 AM PDT Fri Aug 22 2025

.SYNOPSIS...Unusually hot and continued dry conditions will
persist well into next week. Major Heat Risk levels can be
expected through the Cascade foothills and valleys and widespread
Moderate Heat Risk levels over much of the remaining lowland
areas. In addition, elevated fire weather countdowns are expected,
with pockets of extreme conditions especially in the Cascades and
eastern Olympic Mountains.

&&

.SHORT TERM /TODAY THROUGH SUNDAY/...Strong high pressure over the
West will bring warm and dry conditions to western WA through
early next week. Temperatures will track well above normal and in
the 80s and 90s across most lowland areas (areas away from the
water). Lows will also be warm and mainly in the 60s for most
spots. This leads to widespread Moderate Heat Risk for the area.
The Cascade foothills will be even warmer with highs near 100
degrees - with pockets of Major Heat Risk. In addition, fire
danger will reach critical thresholds for hot, dry and unstable
conditions, primarily for the Cascades and east Olympics - Fire
Weather Watches remain in effect. 33

.LONG TERM /MONDAY THROUGH THURSDAY/...Weak onshore pushes will
bring some relief from the heat to the coast, but the interior
will remain warm and in the 80s and 90s through Wednesday. A
stronger push may bring cooler marine air inland Wednesday night
and Thursday but there`s still some uncertainty in the ensemble
spreads. 33

&&

.AVIATION...A strong upper ridge remains in place over the
region today with light west to southwest flow aloft. The low level
flow is northerly or light offshore. VFR conditions will prevail
areawide today.

KSEA...VFR. Surface winds northeasterly 7 to 10 knots becoming
northerly 10 to 14 knots afternoon hours. 27

&&

.MARINE...Surface ridging will continue over the coastal waters
as a thermally induced low pressure expands northward along the
coast. Breezy northerly to northwesterly winds can be expected at
times over the coastal waters, but will stay under small craft
advisory criteria. The thermal troughing will shift inland early
next week for light onshore flow.  27


&&

.FIRE WEATHER...An upper level ridge building over the area
into this weekend will bring a warming and drying trend to
western Washington resulting in elevated to critical fire
weather conditions. Periods of offshore flow will be possible
throughout Friday and Saturday, which will help quickly dry out
fuels from recent rains. Hot, dry, and unstable conditions will
exceed extreme fire weather criteria for the Cascades and east
Olympic mountains.

The elevated fire weather conditions are expected to be
widespread across the rest of the Cascades and areas south of
the sound into the the weekend. High temperatures will be in the
upper 80s to upper 90s with minimum RHs dipping into the 15-30
percent range. Overnight RH recoveries will be relatively poor to
moderate over the weekend due to the aforementioned periods of
offshore flow. Warm and dry conditions look to linger into the
early half of next week.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Fire Weather Watch from Saturday morning through Sunday evening
     for West Slopes of the Central Cascades Generally above
     1500 Feet-West Slopes of the North Cascades Generally above
     1500 Feet.

     Extreme Heat Warning from 11 AM this morning to 5 AM PDT Tuesday
     for Foothills and Valleys of Central King County-Foothills
     and Valleys of Pierce and Southern King Counties-Foothills
     and Valleys of Snohomish and Northern King Counties-
     Foothills and Valleys of Thurston and Lewis Counties-
     Foothills and Valleys of the North Cascades.

     Heat Advisory from 11 AM this morning to 5 AM PDT Tuesday for
     City of Seattle-Downtown Everett / Marysville Area-Eastern
     Kitsap County-Eastside-Foothills of the Western and
     Southern Olympic Peninsula-Lake Crescent Area Including US
     101-Lowlands of Lewis and Southern Thurston Counties-
     Lowlands of Pierce and Southern King Counties-Lowlands of
     Western Skagit and Northwestern Snohomish Counties-Lowlands
     of Western Whatcom County-Middle Chehalis River Valley-
     Northern Hood Canal-Olympia and Southern Puget Sound-
     Shoreline / Lynnwood / South Everett Area-Southern Hood
     Canal-Willapa and Black Hills.

     Fire Weather Watch from Saturday morning through Saturday
     evening for East Portion of the Olympic Mountains.

PZ...None.
&&

$$