Sinlahekin Fire

Perimeter mapped September 19, 2026 at 2:26 PM PDT, 166,007 acres (mixed methods). Point of origin 48.705, -119.693.

Live radar at the fire Forecast for Tonasket

Size

166,005 acres

Containment

92%

Discovered

July 26, 2026 at 2:12 PM PDT

Cause

Undetermined

Location

1 Miles W from Tonasket, WA

County

Okanogan County

State

Washington

Nearest city reported

Tonasket

Protecting agency

DNR

Jurisdiction

DNR

Land ownership at origin

State

Personnel assigned

477

Incident management

Type 3 Team, Type 3 Incident

Primary fuel

Timber (Litter and Understory)

Estimated cost to date

$139,573,080

Incident type

Wildfire

Unique fire identifier

2026-WANES-001791

IRWIN identifier

78D35D3B-F791-4961-AE36-C6D1A4DFF5A0

Mapped area at the last perimeter of each day, from July 26, 2026 (453 acres) to September 20, 2026 (166,007 acres). The largest one-day growth was 163,948 acres, mapped August 27, 2026.

• Wind up to 10 mph from the west
• Relative humidity as low as 31%
• High of 67°F

National Weather Service hourly forecast for the fire’s point of origin, next 24 hours.

Full forecast for Tonasket, WA

Red Flag Warnings and Fire Weather Watches covering the fire's point of origin.

No Red Flag Warning or Fire Weather Watch is in force at the fire.

NOAA’s Hazard Mapping System analysts drew light smoke over the fire’s origin in satellite imagery today (Mon, 5:00 AM PDT to Mon, 8:00 AM PDT).

NOAA’s smoke model forecasts near-surface smoke at the origin peaking at 10.7 µg/m³ around Tue, 7:00 PM PDT over the next 48 hours.

Smoke and fire layers on the radar

Posted on InciWeb, updated September 21, 2026.

The Sinlahekin Fire was reported on July 26, 2026, approximately 1 miles west of Tonasket, Washington. The lightning-caused fire is burning across state, federal, and private lands in Okanogan County. Firefighters continue working to strengthen containment lines, patrol and secure previously burned areas, and respond to areas of active fire. Suppression efforts remain focused on protecting communities, infrastructure, natural and cultural resources, and other values at risk while prioritizing firefighter and public safety.

Original at InciWeb

• Tonasket, WA12 miles east of the fire’s origin
• Oroville, WA20 miles northeast of the fire’s origin
• Omak, WA22 miles south of the fire’s origin
• Okanogan, WA24 miles south of the fire’s origin
• Brewster, WA42 miles south of the fire’s origin
• Republic, WA44 miles east of the fire’s origin