GREAT BARRINGTON, Mass. — The Butternut Fire is 40 percent contained and the command post has been moved to Butternut Ski Area.

Tuesday brought welcome rain and first responders operated with a smaller crew focused on observing. One week into the wildfire, officials maintain that conditions are improving and the public should not be alarmed.

"After additional data gathered yesterday and compiled overnight, we can say with confidence that the fire is 40 percent contained," the Great Barrington Fire Department wrote on Tuesday morning.

"We expect that this containment number will grow rapidly as more verification data is obtained. Do NOT get hung up on the numbers — the fire is controlled and we have not lost any ground — this is simply a number that is used for official reporting. Let us say that again — the fire is controlled."

The department is collecting data and getting more accurate measurements and GPS locations of the burned area, expecting that the acreage involved will grow.

"Let us be clear – the fire did not grow; the data became more accurate," GBFD clarified.

"The perimeter around the fire is expected to be as much as 10 miles. To put the acreage involved in perspective, if the marking on the perimeter moves 1 foot, you have added 1.2 acres. 100 feet (less than 1/3 of a football field) would add 121 acres."

They reiterated that the area is dangerous and the public should stay clear. The smell of smoke will continue and is not a cause for alarm but if air quality deteriorates, the Department of Public Health will provide updated guidance.