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Temperatures in some spots could be as high as 200 to 300 degrees Celsius -- or roughly 400 to 570 degrees Fahrenheit, said Willie Scott, a U.S. Geological Survey geologist.

Scientists also have detected a significant rise in emissions of carbon dioxide and other magmatic gases.

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One day late last week, the mountain emitted about 2,000 tons of carbon dioxide -- up from 100 tons a day earlier this month -- and roughly 100 tons of sulfur dioxide, Scott said.

The mountain gave off more steam Monday morning. On Sunday, a crooked plume of steam rose at least 500 feet above the rim of the crater, dissipating as it drifted about a mile south of the 8,364-foot-high volcano.

Seismic activity remained relatively low.

The restless mountain has vented steam -- sometimes mixed with ash -- several times in the last ten days.

The south side of the lava dome has risen at least 330 feet since Sept. 30.

Activity is expected to ebb and flow, and the most likely scenario now is weeks or months of occasional steam blasts and possibly some eruptions of fresh volcanic rock.