000 FXUS66 KSEW 251633 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 932 AM PDT Sat Jun 25 2022 .SYNOPSIS...An upper level ridge will continue to build over the area through the weekend. The hottest temperatures at this point of the year are expected. Cooler conditions at the coast expected to start Monday while the interior is not expected to cool until Tuesday. Cooler and unsettled weather by mid week. && .SHORT TERM /TODAY THROUGH MONDAY/...Another morning of clear skies today over W WA with temperatures already in the mid to upper 60s in many spots with Sea-Tac and Bremerton already popping above 70. Temps still expected to quickly climb throughout the day as the upper level ridge continues to build over the area before hitting their peak in the mid to upper 80s this afternoon. It would not be surprising if a few locations manage to climb into the low 90s, particularly south of Chehalis, but this is not expected to be widespread today. A north wind will help keep areas directly near the interior waters slightly cooler, but only by a few degrees. The ridge will continue to build Sunday with highs in the upper 80s to low 90s for much of the lowlands. Winds over the interior waters will be calmer during the afternoon hours, resulting in hot conditions everywhere. Relief comes to the coast before the remainder of the area starting on monday as onshore flow picks up and knocks high temps down back to more seasonal values. Highs there are expected to be in the mid 70s. However, heat will persist for the interior region with highs once again in the upper 80s to low 90s. All of that said, the inherited Heat Advisory looks to remain on track for today and into Sunday/Monday, depending on location, and see no reason for any alteration at this time. Remember, as temperatures rapidly warm over the short term it is important to keep in mind that many are not yet acclimated to the conditions, and as a result may be more prone to heat related illnesses. It is important to stay hydrated throughout the day and use proper sun protection. Moreover, do not leave people or pets unattended in cars as temperatures will be significantly higher. Check in on sensitive populations such as the elderly and very young. If necessary, seek out cooling locations. For those who may be seeking relief in/near area waters remember that the water is very cold and can cause hypothermia and shock to set in very quickly. Additionally, with the rivers running fast it those wading/swimming could easily be swept away. Butwin/18 .LONG TERM /TUESDAY THROUGH FRIDAY/...From Previous Discussion...Relief from the heat and a return the wet unsettled weather begins on Tuesday. For the most part highs are expected to be in the low to mid 70s for the lowlands throughout the period. A few disturbances moving through will likely bring some drizzle and some scattered light rain to the region. We will be watching for the potential for some isolated thunderstorms late Monday/Early Tuesday as models are suggesting a good amount of elevated instability. Right now it looks as if the North Cascades are the most likely area to experience any thunderstorms. There is still a great amount of uncertainty when it comes to this portion of the forecast. Butwin && .AVIATION...Continued high pressure over the region will maintain VFR conditions under predominantly clear skies through the period. Breezy north/northeast surface winds increasing to 10 to 15 kt today, easing tonight. KSEA...VFR under clear skies through the period. Northerly wind 10- 15 kt through evening, before easing overnight. Cullen && .MARINE...Offshore flow will prevail over the weekend as a thermal trough builds north along the coast. The small craft advisory remains in effect for Puget Sound and Hood Canal through this evening with gusty north winds. Meanwhile, expect a surge of stratus and southerly winds that will likely bring restricted visibility and advisory strength winds to the inner portions of the coastal waters late Monday. A strong onshore push will likely develop Monday night as low pressure shifts east of the Cascades. Seas will predominantly be 2 to 4 feet across the coastal waters with an increasing short- period component as the winds become more persistently northerly. Cullen && .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...Heat Advisory until 11 PM PDT Monday for Bellevue and Vicinity- Bremerton and Vicinity-East Puget Sound Lowlands-Everett and Vicinity-Hood Canal Area-Lower Chehalis Valley Area- Olympics-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 until 11 PM PDT Sunday for Central Coast-North Coast. PZ...Small Craft Advisory until 11 PM PDT this evening for Puget Sound and Hood Canal. && $$ www.weather.gov/seattle
NWS SEW Office Area Forecast Discussion