The last 24 hours
The house remains inside the Level 1 "Get Ready" zone, unchanged since the Aug 15 redraw. Level 2 "Get Set" holds at 2.0 mi NNE and Level 3 "Go Now" at 3.7 mi NNE, both untouched since Aug 16. The Entiat-side zones (Level 2 at 9.3 mi E, Level 3 at 8.4 mi ENE) also carry no new edit since yesterday's redraw — still well outside the 15 mi range that matters for Plain.
The GIS perimeter refreshed to Aug 20, 7:29 PM PDT: 139,487 acres, 12% contained, up a modest 910 acres, containment flat. InciWeb's Aug 21, 12:21 AM update carries a slightly lower 138,475 acres, 12% — a minor lag, not a real conflict. InciWeb describes overnight fire behavior as "extreme, crowning, long-range spotting, uphill runs," with active spread on the ridge above Twin Lakes, Cougar Mountain, and Stormy/Baldy Mountains — all on branches away from the Plain-facing side. The nearest perimeter edge held exactly flat at 6.6 mi N.
VIIRS: nearest detection 6.5 mi NNE within the last 24h. The cluster at 6.8 mi NNE flagged UNVERIFIED in last night's brief now has a second calendar day of detections (Aug 20 and 21, 20 hits total) and reads as persistent background heat, not a new start. Two new single-day clusters appeared further out — 9.5 mi N and 9.8 mi NNE (4 detections each, low intensity) — flagged UNVERIFIED, carrying to tomorrow, and well outside the 15 mi threshold either way.
The Chelan County evacuation-zone page is still on its Aug 17, 3:30 PM post describing the Chiwawa Level 3 expansion — now more than four days stale. Lake Chelan Now's latest post repeats the community meeting notice (Tuesday, 6:30 PM, Lake Wenatchee Recreation Club). lakewenatcheeinfo.com did not return usable content this cycle. A general search surfaced only older articles.
Fire weather
NWS Spokane reissued the Fire Weather Watch, confirming Saturday 11 AM through Sunday 8 AM, tied to a pattern change bringing thunderstorms and gusty winds. Today is light and mixed — S 0–3 mph, shifting to N ~3 mph tonight — both weak enough not to matter. Saturday's forecast wind is NW 3–14 mph, gusts to 23 mph, which pushes the fire east, away from Plain, but arrives with a 50% chance of thunderstorms — the day to watch for outflow behavior. A Heat Advisory also runs today, 11 AM–10 PM.
Air quality
Mixed: AQI 59 (down from 62 yesterday afternoon), but PM2.5 jumped to 35.2 µg/m3 this morning as overnight smoke settled — consistent with NWS's forecast of "areas of smoke" before 11 AM. The Air Quality Alert was renewed, now running through 2:00 PM PDT today.
Roads: no blocks logged.