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I would guess at my current ignorance level, that it might be a car. [Edit: That can not be right it lasted at least 5 minutes]
On 10 March 2003, a new thermal feature was reported west of Nymph Lake, located about 3.5 km northwest of the Norris Museum. A linear series of vigorous fumaroles about 75 m long had formed in a forested area located about 200 m from the lake's west shoreline on the side of a hill. Fine particles of rock and mineral fragments ejected from the fumaroles coated nearby vegetation. Fumarole temperatures were as high as 92°C (198°F), the boiling temperature of water at that elevation.
Recently, localized uplift in the north-central caldera also appears to be linked to temporary hydrothermal phenomena. During the period 1997–2003, uplift in this area produced dilatation greater than 6 microstrain (Wicks et al. 2006). Such dilatation could be responsible for some of the unusual thermal phenomena noted at the nearby Norris geyser basin during 2003, wherein the normally dormant Steamboat geyser erupted three times, a 75 m long rift opened up 3 km to the north of Norris, creating a new fumarole field, and a ‘disturbance’ in the geyser basin created new mudpots, fumaroles and acres of vegetation killed by heat.