Not much in the way of fires:
The transient heat flash from the fireball was felt by the witnesses at Vanavara, and apparently within about 30 km it was strong enough to ignite small temporary fires in the forest and singe tree bark. From: 1908 SIBERIA EXPLOSION: Reconstructing an Asteroid Impact from ...
The evidence suggets that the Tunguska object exploded before it impacted the ground, or the effect on the surface itself would have been much more severe, as it was 12,900 years ago in Canada.
They are not even sure it was a meteor in the classic sense, some say it was a large ball of plasma energy.