How the record has moved
Each step is a change on the interagency incident record — acreage, containment or crews — with the date it was reported. No satellite reading is involved.
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Wednesday 13 May
First reported
—
acreage not yet reported
154
days burning so far
—
no share of the perimeter reported held yet
The official record as of 10:09am today
The Derby Fire is on the interagency wildfire record in Dewey County, South Dakota. The figures below are the official record. A satellite heat map and day-by-day history appear here as soon as detections are attributed to this fire.
Undetermined
The cause has not yet been determined.
154 days
on record — first written down on Wednesday 13 May at 3:45pm local time.
45.445, -101.037lat, lon
is the official point of origin on the interagency record.
Conditions measured 11.7 miles from the fire: 45°F, air at 80% humidity, a 20 mph wind out of the north-west.
Two other fires are burning inside the same view. Route 2 Fire started on Tuesday 25 August, 14.1 miles south, and has reached an unrecorded size. TL Lightning 02 Fire started on Monday 27 July, 14.7 miles south-east, and has reached an unrecorded size. Their heat is counted against them, not against this fire, and the pale rings on the map mark where they are recorded.
Smoke has been recorded lying over this ground 11 times so far. The thickest of it was moderate between 9:00am and 11:00am local time. The last of those windows closed 113 hours ago, so what is overhead now is not known.
No satellite heat has been attributed to this fire yet — either it is too new for a pass to have caught it, or it is too small to register from orbit. Everything above is from the interagency incident record and updates as that record does.