SHORT TERM /TONIGHT THROUGH SUNDAY/
Overall key messages have not changed with this forecast update.

* HEAT...Continued warming will lead to hot conditions beginning Friday. Temperatures peak for most of the region in the upper 80s to upper 90s on Sunday, before beginning to slowly ease into next week. A Heat Advisory is in effect for the entire region beginning Friday afternoon, ending Sunday evening for the coast, Monday evening elsewhere.

* FIRE WEATHER...Increasing dry and unstable conditions for this weekend has warranted the issuance of a Fire Weather Watch for the Cascades. See the Fire Weather discussion below for details.

Not a cloud in the sky can be spotted on satellite imagery this afternoon with temperatures in the upper 70s to low 80s through most of the area, cooler in the mid 60s to mid 70s along the coast. Water vapor imagery shows the ridge axis offshore, with the highest heights centered over central California. The ridge will amplify Friday and Saturday before the ridge axis slowly moves over the region on Sunday.

High and low temperatures will increase each day. Highs Friday and Saturday will be similar, in the 80s around and north of Seattle, low to mid 90s through the Southwest Interior, 70s along the immediate coast. Sunday looks to be the warmest day across the region, with widespread 90s, reaching near 100 in locations along the interior Chehalis valley and the Cascade valleys. Record high temperatures are comparatively low compared to surrounding days, so it appears that record highs will potentially be set for the day (July 7th). Temperatures along the coast will range from the mid 70s to mid 80s. Low temperatures will rise from the low to mid 50s on Friday morning to the low to mid 60s on Monday morning.
Lows will be locally warmer in the urban heat islands.

HeatRisk values remain Moderate through most of western Washington through the short term, with the exception of the coast. Sunday sees the introduction of some isolated areas of Major HeatRisk, most notably in the urban heat islands and west-facing slopes and valleys of the Cascades.

LONG TERM /MONDAY THROUGH THURSDAY/
Ensemble solutions are in good consensus that the ridge axis will gradually move across the region, finally moving to the east Tuesday into Wednesday.
Temperatures look to remain very warm on Monday, similar to Sunday through perhaps a degree or two cooler. A weak push along the coast will keep conditions cooler there. Increasing onshore flow going into mid-week will allow temperatures to gradually decrease a few degrees each day going into mid-week though still remaining above average.

LH

AVIATION
High pressure and offshore flow will lead to a dry and stable air mass across western WA with VFR conditions.

KSEA...Clear. N winds 10-15kt through 03z, easing and becoming NE to 5 kt thereafter.

33

MARINE
Light, offshore flow through the weekend with a thermal trough along the coast. The flow will turn onshore Monday and Tuesday with stronger westerly pushes down the strait.

33

FIRE WEATHER
Benign fire weather conditions are expected to remain for today. However, confidence is high on an amplifying upper- level ridge settling over the region beginning Friday. The heat is expected to peak over the weekend with the hottest temperatures likely on Sunday. Critical RH values are trending widespread over the Cascades with isolated areas within the Olympic Mountain valleys during this time. The hot and dry setting will be enough to maintain elevated fire weather conditions especially with fuels expected to dry out rapidly during this heat stretch falling upon the holiday weekend. Because of this we've issued a fire weather watch for zones 658 and 659. The next notable push of onshore flow will arrive Sunday night into Monday. It'll bring decent RH recoveries to fire zones such as 650 and 652 but won't be strong enough to completely limit the threat for the Cascades early next week.

McMillian

SEW WATCHES/WARNINGS/ADVISORIES
WA...Heat Advisory from noon Friday to 10 PM PDT Monday for Admiralty Inlet Area-Bellevue and Vicinity-Bremerton and Vicinity- East Puget Sound Lowlands-Eastern Strait of Juan de Fuca- Everett and Vicinity-Hood Canal Area-Lower Chehalis Valley Area-Olympics-San Juan County-Seattle and Vicinity- Southwest Interior-Tacoma Area-West Slopes North Cascades and Passes-West Slopes North Central Cascades and Passes- West Slopes South Central Cascades and Passes-Western Skagit County-Western Whatcom County.

Heat Advisory from noon Friday to 10 PM PDT Sunday for Central Coast-North Coast-Western Strait of Juan De Fuca.

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.

PZ...None.