Sisi Fire
Active
Chelan County, Washington · Discovered August 14, 2026
Source: NIFC/IRWIN (interagency) · Last upstream update 3 days ago · Perimeter mapped 3 days ago (NIFC WFIGS)
Sisi Fire
The Sisi Fire fire has burned 4,816 acres in Chelan County, Washington. Crews have reached 90% containment. It has shown no measurable growth in the last 24 hours. Wind at the fire is blowing 10 mph toward the NW, with gusts to 15 mph. Air quality near the fire is moderate (AQI 58). 14 personnel are assigned to the incident.
Sisi Fire size over time
56 official size readingsGrew from 1 to 4,816 acres across these reports.
Acreage as reported by the official incident feed, recorded by Fire Nearby each time it changes. Hover or tap the chart for each reading.
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Incident timeline
Generated automatically from official feeds the moment they change: size, containment, evacuation zones, aircraft, and incident team updates.
Containment rose to 90%
3 days ago · November 10, 2026Containment rose to 75%
3 days ago · November 9, 2026Containment rose to 65%
5 days ago · November 8, 2026Containment rose to 60%
6 days ago · November 7, 2026Containment rose to 50%
8 days ago · November 5, 2026Containment rose to 45%
9 days ago · November 4, 2026Containment rose to 40%
13 days ago · October 31, 2026New perimeter mapped at 4,687 acres (national perimeter feed)
24 days ago · October 20, 2026Grew 149 acres in 7 days to 4,743 acres
24 days ago · October 19, 2026New perimeter mapped at 4,594 acres (national perimeter feed)
31 days ago · October 12, 2026Containment rose to 34%
33 days ago · October 11, 2026New perimeter mapped at 4,439 acres (national perimeter feed)
34 days ago · October 10, 2026Grew 110 acres in 12 days to 4,385 acres
37 days ago · October 7, 2026Containment rose to 29%
44 days ago · September 29, 2026New perimeter mapped at 4,325 acres (national perimeter feed)
46 days ago · September 27, 2026Grew 117 acres in 23 hours to 4,275 acres
49 days ago · September 24, 2026New perimeter mapped at 4,169 acres (national perimeter feed)
50 days ago · September 24, 2026New perimeter mapped at 3,993 acres (national perimeter feed)
51 days ago · September 22, 2026Grew 232 acres in 5 days to 3,908 acres
52 days ago · September 22, 2026New perimeter mapped at 3,838 acres (national perimeter feed)
53 days ago · September 20, 2026New perimeter mapped at 3,731 acres (national perimeter feed)
55 days ago · September 18, 2026Containment rose to 15%
56 days ago · September 17, 2026New perimeter mapped at 3,676 acres (national perimeter feed)
57 days ago · September 16, 2026New perimeter mapped at 3,449 acres (national perimeter feed)
58 days ago · September 15, 2026Containment dropped to 5% (from 11%)
61 days ago · September 13, 2026Grew 139 acres in 24 hours to 3,193 acres
61 days ago · September 13, 2026Grew 242 acres in 22 hours to 3,054 acres
62 days ago · September 12, 2026Grew 100 acres in 3 days to 2,812 acres
63 days ago · September 11, 2026Grew 191 acres in 48 hours to 2,712 acres
66 days ago · September 8, 2026Grew 277 acres in 4 days to 2,521 acres
68 days ago · September 6, 2026Containment rose to 11%
69 days ago · September 4, 2026Containment rose to 5%
71 days ago · September 3, 2026Grew 140 acres in 25 hours to 2,244 acres
72 days ago · September 2, 2026Grew 310 acres in 47 hours to 2,104 acres
73 days ago · September 1, 2026Grew 290 acres in 24 hours to 1,794 acres
75 days ago · August 30, 2026Grew 626 acres in 4 days to 1,504 acres
76 days ago · August 29, 2026Grew 144 acres in 2 days to 878 acres
80 days ago · August 25, 2026Official incident page published on InciWeb: Sisi Fire
81 days ago · August 23, 2026Grew 228 acres in 26 hours to 734 acres
82 days ago · August 23, 2026Grew 381 acres in 22 hours to 506 acres
83 days ago · August 21, 2026
Raw growth & containment readings
| Recorded | Size | Contained |
|---|---|---|
| 11/10/2026, 3:12:27 AM | 4,816 acres | 90% |
| 11/9/2026, 4:02:09 PM | 4,816 acres | 75% |
| 11/8/2026, 1:54:07 AM | 4,816 acres | 65% |
| 11/7/2026, 2:00:34 AM | 4,816 acres | 60% |
| 11/5/2026, 1:48:37 AM | 4,816 acres | 50% |
| 11/4/2026, 2:06:32 AM | 4,816 acres | 45% |
| 10/31/2026, 1:01:32 AM | 4,816 acres | 40% |
| 10/29/2026, 8:16:24 PM | 4,774 acres | 35% |
| 10/19/2026, 3:50:11 PM | 4,743 acres | 34% |
| 10/13/2026, 11:09:56 PM | 4,615 acres | 34% |
| 10/13/2026, 12:11:11 AM | 4,594 acres | 34% |
| 10/11/2026, 2:46:07 AM | 4,439 acres | 34% |
| 10/10/2026, 12:53:15 AM | 4,439 acres | 29% |
| 10/9/2026, 12:11:46 AM | 4,420 acres | 29% |
| 10/8/2026, 12:07:37 AM | 4,401 acres | 29% |
| 10/7/2026, 1:02:30 AM | 4,385 acres | 29% |
| 10/6/2026, 12:03:49 AM | 4,368 acres | 29% |
| 10/4/2026, 12:48:12 AM | 4,352 acres | 29% |
| 10/2/2026, 12:09:55 AM | 4,343 acres | 29% |
| 9/29/2026, 10:22:40 PM | 4,330 acres | 29% |
Recorded by Fire Nearby each time upstream data changes.
About this data
Fire Nearby aggregates official incident data and shows exactly when each value was last updated. For evacuation decisions, always follow instructions from local emergency officials and check county emergency management channels.