Orpha Fire

201025,822 acresWyoming

The Orpha Fire burned 25,822 acres, about 40 square miles, across Converse County. It began on October 4, 2010.

Watch how it happened

Orpha Fire · 2010

How it happened

Watch it burn in the order satellites saw it, coloured by how severely each place burned.

About this replay

Date (UTC)—Historical replay

Burned so far—acres

High severity—of the area so far

Detections26satellite fire pixels

Fire milestones

Burn severityHigh, Moderate, Low, Unburned to low, Increased greenness

Burning nowAreas reached in the last half day of satellite passes

Manhattan, to scale23 square miles of land, drawn at the fire’s scale

Timing: NASA FIRMS satellite fire detections (26 MODIS) inside the final perimeter; each place takes the time of its nearest detection, so the order is satellite-observed but interpolated between passes, roughly every 12 hours. Severity: Monitoring Trends in Burn Severity (USGS, U.S. Forest Service), mapped from Landsat after the fire.

How severely it burned

Burn severity inside the final perimeter, classified from Landsat images taken before and after the fire.

Map of burn severity across the Orpha Fire

Burn severity by class
Severity	Share	Acres
Moderatemixed: many trees killed, some survive	32%	8,252
Lowsurface fire, most trees survive	61%	15,794
Unburned to lowislands inside the perimeter, little change	6.9%	1,776

No part of the fire was classed as high severity; 32% burned at moderate severity.

Monitoring Trends in Burn Severity (U.S. Geological Survey and USDA Forest Service). Classes come from the change in a Landsat burn index (dNBR) between images before and after the fire; acres are each class’s share of the fire’s mapped area.

Where it burned

Acres inside each county, measured from the satellite-mapped perimeter.

Acres burned by county

Converse County	WY	25,838

Monitoring Trends in Burn Severity (USGS and U.S. Forest Service). Type recorded: Wildfire.