Thunder Creek Fire

Perimeter mapped September 10, 2026 at 2:48 PM PDT, 760 acres (remote sensing derived). Point of origin 48.550, -121.029.

Live radar at the fire Forecast for Concrete

Size

715 acres

Containment

0%

Discovered

August 22, 2026 at 2:51 PM PDT

Cause

Natural

Location

13 Miles SE from Newhalem, WA

County

Skagit County

State

Washington

Nearest city reported

Marblemount

Protecting agency

NPS

Jurisdiction

NPS

Land ownership at origin

NPS

Incident management

Type 4 IC, Type 4 Incident

Primary fuel

Timber (Litter and Understory)

Estimated cost to date

$150,000

Incident type

Wildfire

Unique fire identifier

2026-WANCP-000482

IRWIN identifier

ADBAA559-5CE7-4B1E-9FC0-14D0A3F2CE22

Mapped area at the last perimeter of each day, from August 25, 2026 (223 acres) to September 19, 2026 (760 acres). The largest one-day growth was 425 acres, mapped August 27, 2026.

• Wind up to 9 mph from the south
• Relative humidity as low as 31%
• High of 63°F

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

Full forecast for Concrete, 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 have not drawn smoke over the fire’s origin today.

NOAA’s smoke model forecasts near-surface smoke at the origin peaking at 0.5 µg/m³ around Mon, 4:00 AM PDT over the next 48 hours.

Smoke and fire layers on the radar

• Concrete, WA33 miles west of the fire’s origin
• Darrington, WA33 miles southwest of the fire’s origin
• Arlington Heights, WA53 miles southwest of the fire’s origin
• Granite Falls, WA54 miles southwest of the fire’s origin
• Sedro-Woolley, WA55 miles west of the fire’s origin
• Clear Lake, WA55 miles west of the fire’s origin