


Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA
Issued by NWS Seattle/Tacoma, WA
315 FXUS66 KSEW 071038 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 338 AM PDT Mon Jul 7 2025 .SYNOPSIS...Warm temperatures will continue into Tuesday as a ridge of high pressure dominates. A weak system will bring a brief cool down and a chance of light showers on Wednesday before high pressure rebuilds for the latter part of the week leading to a return of warmer temperatures and dry conditions. && .SHORT TERM /TODAY THROUGH WEDNESDAY/...A warm day is in store for western Washington as an upper-ridge traverses overhead. Subsidence aloft will bring mostly clear skies (after morning stratus retreats) and increase max temps 7-10 degrees above average. Temperatures will top out in the lower to upper 80s throughout the interior with valley locations near 90 F. Coastal areas are expected to be cooler with values in the 60s. Overnight lows will fall into the lower 50s to near 60 F with the warmest temps felt in the Seattle Metro. The ridge axis will be well east of the Cascades on Tuesday but an additional warm day is in store. A Moderate (Orange) threat for HeatRisk must be expressed on Tuesday for the Seattle area as the previous overnight cooling isn`t expected to be robust. This level mainly affects those sensitive to heat, especially those without adequate cooling/hydration. The rest of W WA will see a Minor (Yellow) threat. A reprieve is on the way however as a trough and its associated front enters on Wednesday. Temperatures will cool substantially as light showers return to the area. The coast and northern half of the Cascades will see the best probability for the precipitation. Upper 60s to lower 70s are the features highs for Wednesday. .LONG TERM /THURSDAY THROUGH SUNDAY/...We`ll be on the backside of the trough on Thursday as the pattern transitions. While some lingering clouds and isolated light showers are possible, the overall trend will be towards partly sunny skies and temperatures in the 70s for interior areas. Upper level ridging is expected to rebuild over the region by late week. Temperatures will begin to climb back into the mid 70s to low 80s across the interior lowlands. Another weak front might brush the area late next weekend. McMillian && .AVIATION...Northwesterly flow aloft will gradually become more westerly through the day today as upper ridging flattens over the region. Onshore flow will continue in the low levels. Satellite imagery shows stratus has pushed inland along the coast and into the Southwest Interior this morning and is currently making its way down the Strait of Juan de Fuca. Do not expect for stratus to make its way into the majority of the interior terminals, however. Current conditions range from MVFR to IFR for terminals in stratus to VFR for terminals across the interior. Expect stratus to lift and scatter by the late morning hours for a return to more widespread VFR conditions by this afternoon. Surface winds are primarily out of the north between 4-7 kts this morning, but will increase to 8-12 kts by this afternoon. Another round of stratus is likely to make its way inland early Tuesday. KSEA...VFR conditions will continue through the TAF period. Winds out of north between 4-7 kts this morning will increase to 8-12 kts this afternoon. Winds will then ease again by this evening. 14 && .MARINE...High pressure will persist over the coastal waters today into early Tuesday. A weak frontal system will then move into the coastal waters Tuesday night into Wednesday and may bring a brief uptick in seas. Diurnally driven westerly pushes will continue along the Strait of Juan de Fuca over the next several evenings. The push tonight looks to bring small craft strength wind gusts to the central and eastern Strait. The subsequent pushes look stronger as onshore flow increases near midweek, especially in the wake of the front. A weak low pressure system may move into the area waters on Thursday and will be followed by high pressure building back into the coastal waters Friday into the weekend. Seas will generally persist between 3-6 ft through much of the week and could become steep at times with persistent northerly winds over the coastal waters. 14 && .FIRE WEATHER...An elevated concern for fire weather must be expressed for both Monday and Tuesday. An upper-ridge will bring a period of warm, dry weather as temperatures top out 7-10 degrees above average for early July. Minimum RHs are expected to bottom out between 20-30% for locations within Cascade valleys. However, steady low-level onshore flow looks to bring decent RH recoveries overnight. A reprieve will arrive on Wednesday as a weak front enters the region. Here we`ll see a substantial decrease in temperatures and an increase in PoPs as light shower activity enters by Wednesday morning. This system won`t be a washout by any means, but a decent chance of wetting rain (>0.25") looks favorable for the northern sections of the Olympics and Cascade with a 30-40% chance. Localized areas such as Mt. Baker are around 50%. Warmer and drier weather looks to return towards the second half of the week. McMillian .SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...Small Craft Advisory from 5 PM this afternoon to 9 AM PDT Tuesday for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca. && $$